Relevant bibliographies by topics / Anti-jam

Academic literature on the topic 'Anti-jam'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Anti-jam"

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Casabona, Mario M., and Murray W. Rosen. "Discussion of GPS Anti-Jam Technology." GPS Solutions 2, no. 3 (January 1999): 18–23. http://dx.doi.org/10.1007/pl00012752.

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Fairhurst, Godred, and Tim Spracklen. "An anti-jam packet data satellite link." International Journal of Satellite Communications 7, no. 3 (July 1989): 201–7. http://dx.doi.org/10.1002/sat.4600070310.

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Ariyanti, Ariyanti, Eni Masruriati, Tsani Imadahidayah, and Eka Nur Sulistianingsih. "Pemanfaatan kitosan dari cangkang kerang bulu (Anadara antiquata) sebagai pengawet ikan pari (Dasyatis sp.) dan udang vaname (Litopenaeus vannamei)." Riset Informasi Kesehatan 9, no. 1 (June 29, 2020): 12. http://dx.doi.org/10.30644/rik.v9i1.241.

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Latar Belakang : Penggunaan senyawa anti mikroba yang tepat dapat memperpanjang umur simpan suatu produk serta menjamin keamanan produk. Untuk itu dibutuhkan bahan sebagai anti mikroba yang alami supaya tidak membahayakan bagi kesehatan. Penggunaan kitosan untuk menghambat aktivitas mikroba pada udang vaname (Litopenaeus vannamei) akan diuji efektivitasnya. Metode : Pada penelitian ini kitosan yang digunakan sebagai anti mikroba diekstraksi dari cangkang kerang bulu (Anadara antiquata). Kitosan yang diperoleh kemudian digunakan sebagai anti mikroba ikan pari (Dasyatis sp.) dan udang vaname (Litopenaeus vannamei). Kitosan dilarutkan dalam asam asetat dengan variasi konsentrasi kitosan 1%; 1,5%, 2% dan 2,5%. Lama waktu penyimpanan udang: 0 jam, 5 jam, 10 jam, 15 jam dan 20 jam. Hasil : Kitosan dari cangkang kerang bulu dapat digunakan sebagai pengawet alami ikan pari dan udang vaname. Konsentrasi optimal kitosan yang digunakan sebagai pengawet ikan pari adalah 2% dapat memperpanjang umur simpan ikan selama 15 jam. Sedangkan konsentrasi optimal kitosan yang digunakan sebagai pengawet udang vaname adalah 1,5% dapat memperpanjang umur simpan ikan selama 15 jam. Kesimpulan : Konsentrasi kitosan cangkang kerang bulu yang paling optimal sebagai pengawet alami ikan pari adalah 2% dapat memperpanjang umur simpan ikan pari selama 15 jam.
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Nemov, A. V., D. A. Nemov, D. L. Minh, S. A. Saveliev, and A. N. Plastikov. "Efficiency of the Miniature Anti-jam GNSS Antenna Array." Journal of the Russian Universities. Radioelectronics, no. 2 (June 5, 2018): 37–46. http://dx.doi.org/10.32603/1993-8985-2018-21-2-37-46.

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The use of the miniature controlled reception pattern antennas (CRPAs) in GNSS equipment is one of the trends in GPS, Baidow, GLONASS development. A miniaturized GPS antenna array technology reduces the size of the antenna elements and the array dimensions. Miniature CRPAs are in demand not only with mass consumer of GPS/GLONASS house-hold equipment, but with expert users of complex hardware as well, where high-tech multi-sensor miniature antenna systems (AC) can be applied. Such types of AC used for intelligent control of spatial selectivity are considered as antenna arrays. The advantages of miniature CRPAs with anti-jamming capability include possibility to be installed on vehicles where it used to be impossible due to their size. The negative effect of miniaturization is in degradation of some antennas characteristics, such as gain, suppression of the reverse lobe of radiation pattern (RP), a heterogeneity of RP. In miniature antennas, the resonator interinfluence increases, that leads to distortion of individual emitters RP and to the in-crease of the total RP lobe of the antenna array irregularity, as well as the width of RP lobe. Designers take special measures to reduce the interinfluence of the resonators. However, they are not fully described in the available literature. Therefore, the achieved performance of miniature CRPAs is in great interest. The final criterion (from a consumer point of view) is in effective functional of a device containing a miniature CRPA, the degradation of its parameters in compare with traditional CRPA equipment of expert users. The authors focus on property investigation of miniature CRPAs manufactured primarily by US industry. Specifications of two antennas and some expected details of the miniaturized antenna array technology are described along with the test results of their ability to perform the objective function jammer suppression. The article contains the results obtained from independent testing of electrodynamics parameters of miniature L1/L2 frequency CRPA and its design analysis. The experimental data of sensor interinfluence are outlined. The measures to reduce the sensor interinfluence are take into account. The efficiency of the miniature antenna is estimated in the process of interference suppression by means of computer simulation. The Monte-Carlo method is applied. For the sake of generality, two types of algorithm for interference suppression are used.
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Dhiancinantyan Windydaca Brata Putri and Ni Putu Aryati Suryaningsih. "EFEK EKSTRAK DAUN SENDOK (Plantago major L.) TERHADAP ERITEMA PADA MARMUT PUTIH BETINA (Guinea pig) OLEH RADIASI ALAT MODIFIKASI UV 04-08." Jurnal Ilmiah Medicamento 4, no. 1 (March 30, 2018): 1–12. http://dx.doi.org/10.36733/medicamento.v4i1.872.

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Penelitian ini bertujuan untuk mengetahui efek anti-inflamasi ekstrak daun sendok (Plantago major L.) pada hewan coba berupa marmut putih betina (Guinea pig) yang diinduksi radiasi UV-B (290-320 nm). Penelitian ini menggunakan 30 ekor marmut putih betina yang dibagi menjadi kelompok uji sebanyak 10 ekor, kelompok pembanding sebanyak 10 ekor dan kelompok kontrol sebanyak 10 ekor. Kelompok uji diberi kapsul daun sendok dengan dosis 50 mg/kg yang diberikan secara oral tiap 5 jam sekali sehari, kelompok pembanding diberi obat antalgin dengan dosis 50 mg/kg yang diberikan secara oral tiap 5 jam sekali sehari dan kelompok kontrol diberi aquadem secara oral tiap 5 jam sekali sehari. Parameter yang diamati berupa perbandingan gradasi eritema dan persentase perubahan luas area eritema setelah diinduksi radiasi UV-B dan 24 jam setelah diinduksi radiasi UV-B. Berdasarkan hasil persentase perubahan luas area eritema dan gradasi eritema dapat disimpukan bahwa ekstrak daun sendok memiliki efek anti-inflamasi, tetapi efek anti-inflamasi ekstrak daun sendok tidak sebaik efek anti-inflamasi antalgin (sebagai pembanding).
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Byarushengo, Denice, Rwaichi Minja, and Abraham Temu. "Lemongrass and Cinnamon Essential Oils as Vitamin C Preservatives and Flavour Enhancers in Jam." Tanzania Journal of Engineering and Technology 35, no. 1 (June 30, 2014): 46–53. http://dx.doi.org/10.52339/tjet.v35i1.468.

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Lemongrass and cinnamon essential oils (LEO and CEO) are natural oils with high anti-oxidation capacity, pleasant flavour, and various health benefits. Their ability to preservevitamin C and flavour in jam have not been tested. In this study the performance of twoessential oils (EOs) in preserving vitamin C and improving jam flavour were investigated.The EOs were produced by hydro-steam distillation of fresh lemongrasses and cinnamonleaves using a Clevenger apparatus. Jam samples were dosed with various concentrationsof either single or mixed EOs and then stored at either room or refrigeration temperature.Samples were analysed for changes in vitamin C content and flavour, after every 10 daysfor 60 days. Vitamin C content was determined using 2,6 dichlorophenol indophenol visualtitration method, whereas sensory analysis was done by five semi trained panellists. It wasrevealed that both LEO and CEO have high potential to reduce loss of vitamin C andimpart better flavour in pineapple jam. The improved quality of the jam is due to anti-microbial and anti-oxidant effects of the essential oils as reported in literature. Mixing theEOs had synergistic effect which maximizes their potential to reduce vitamin C loss withlower dose than when used individually. Mixed EOs doses also enhanced the jam flavour.
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Martynyuk, S. Ye, D. O. Vasylenko, F. F. Dubrovka, and A. G. Laush. "Novel microstrip antenna array for anti-jam satellite navigation system." Radioelectronics and Communications Systems 58, no. 3 (March 2015): 97–106. http://dx.doi.org/10.3103/s0735272715030012.

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Fairhurst, G. "On-board processing for anti-jam packet data satcom services." Electronics & Communications Engineering Journal 4, no. 3 (1992): 115. http://dx.doi.org/10.1049/ecej:19920021.

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Zhu, Zhou, Zhang Er-yang, and Lu Shu-jun. "A Kind of Cascade Anti-Jam Method for GPS Receiver." Procedia Engineering 23 (2011): 16–23. http://dx.doi.org/10.1016/j.proeng.2011.11.2458.

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Aulia, Cindy Rizka. "PENGARUH WAKTU DAN PELARUT EDTA (Ethylenediaminetetraacetic Acid) PADA EKSTRAKSI FUKOIDAN DARI RUMPUT LAUT COKELAT Sargassum binderi Sonder." Inovasi Pembangunan : Jurnal Kelitbangan 8, no. 03 (December 6, 2020): 265. http://dx.doi.org/10.35450/jip.v8i03.211.

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Rumput laut cokelat memiliki beragam polisakarida yang terkandung di dalamnya. Salah satu polisakarida dari rumput laut cokelat yang diketahui memiliki bioaktivitas yang tinggi adalah fukoidan. Banyak penelitian telah menunjukkan bahwa bioaktivitas dari fukoidan antara lain mampu menghambat pertumbuhan sel kanker, anti koagulan, anti virial, dan sebagai immunostimulan. Mengisolasi fukoidan dari rumput laut cokelat telah banyak dilakukan dengan beragam cara. Penelitian ini bertujuan untuk mengetahui bagaimana pengaruh waktu dan konsentrasi pelarut EDTA (ethylenediaminetetraacetic acid) pada proses ekstraksi dan karakteristik fukoidan dari rumput laut cokelat jenis Sargassum binderi Sonder. Konsentrasi pelarut yang digunakan pada penelitian ini sebesar 0,15% ; 0,3%: 0,5%; 1%; dan 1,3% serta waktu ekstraksi selama 1 jam, 2 jam, 3 jam, 4 jam, dan 5 jam. Perbandingan rumput laut dan air adalah 1:30 dengan suhu ekstraksi dilakukan pada 70˚C. Dalam penelitian ini didapatkan yield crude fucoidan terbesar pada waktu ekstraksi 4 jam dan konsentrasi pelarut 1,3% yaitu sebesar 3,67%. Hasil analisis menunjukkan kandungan total gula dari ekstrak fukoidan dengan yield terbesar didapatkan sebesar 36,48% dan kandungan sulfat sebesar 17,16%.
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Dissertations / Theses on the topic "Anti-jam"

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Eng, Thomas. "ANTI-JAM PERFORMANCE OF SEVERAL DIVERSITY COMBINERS." International Foundation for Telemetering, 1997. http://hdl.handle.net/10150/609757.

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International Telemetering Conference Proceedings / October 27-30, 1997 / Riviera Hotel and Convention Center, Las Vegas, Nevada
The relative anti-jam (AJ) performance of several diversity combiners are investigated. The modulation is 8-ary frequency-shift-keying (FSK), the demodulation process consists of energy detection of the eight frequency bins at each hop and the subsequent combining of detector outputs. Three combiners are considered : the linear combiner, where the detector outputs of each hop (corresponding to the same frequency bin) are summed without any processing; the self-normalized combiner, where the eight detector outputs of any particular hop are normalized so that they add to unity; and the max-normalized combiner, where the eight detector outputs of any hop are divided by the maximum value among those eight outputs. Results indicate that under worst-case tone jamming, the selfnormalized combiner performs the best, the max-normalized combiner second best, and the linear combiner performs the worst among the three.
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Kavvadias, Vasilios Christos. "Joint tactical anti-jam communications: a systems approach." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/26032.

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Fairhurst, Godred. "A study of error control techniques and the use of an enhanced X.25 LAPB protocol on a pseudo-random frequency-hopped anti-jam satellite link." Thesis, University of Aberdeen, 1987. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=129205.

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The Skynet IV satellite will provide a medium for an integrated digital communications network. This will use the packet-oriented techniques employed in many modern communications systems. One important role of the system will be to provide jam-resistant services. The advent of sophisticated electronic jammers has required the application of complex error-correcting codes and data interleaving techniques. When the satellite link forms part of a wider network, these have profound effects upon the performance of the data link protocol. This project has examined some of these effects. Terrestrial data link control protocols were found to be very inefficient, and a number of enhancements to these protocols have been proposed. An implementation of the enhanced protocols has been tested within a simulation environment. The simulator was written in Simula, an object-oriented programming language. The performance of the link was observed to be highly dependent upon the error environment presented by the underlying physical layer service (in this case a frequency-hopped spread spectrum anti-jam satellite circuit). A model of the physical layer was combined with a link layer simulator. The model used an unusual technique to reduce the computational requirements of the simulator. The project revealed that a conventional anti-jam satellite circuit is unsuitable for carriage of packetised data services. However, a number of simple changes to the protocol and error control techniques may yield a significant increase in the performance, permitting use of the service even in the harsh error environments presented by hostile jammers. These results are to be used in the specification of future satellite modems.
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Jelena, Nađpal. "Fitohemijski skrining i biološka aktivnost ekstrakata i tradicionalnih proizvoda od plodova divljih ruža (Rosa L.;Rosaceae)." Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2017. https://www.cris.uns.ac.rs/record.jsf?recordId=104437&source=NDLTD&language=en.

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   Cilj ove doktorske disertacije predstavljalo je ispitivanje fitohemijskog sastava i biološke aktivnosti vodenih i metanolnih ekstrakata svežih i suvih plodova, kao i voćne kaše i džema pripremljenih po tradicionalnoj recepturi od plodova šest samoniklih vrsta Rosa L.: R. canina, R. dumalis, R. dumetorum, R. tomentosa, R. arvensis, R. sempervirens. Ispitivanje fitohemijskog sastava obuhvatalo je LC -MS/MS analizu 64 odabrana fenolna jedinjenja, hinske kiseline (organske kiseline) kao i tri triterpenoida. Takođe, izvršeno je spektrofotometrijsko određivanje sadržaja ukupnih fenolnih i flavonoidnih jedinjenja, kao i vitamina C. Evaluacija biološke aktivnosti obuhvatala je in vitro ispitivanja  antioksidantne i antiinflamatorne aktivnosti, kao i ispitivanje uticaja ekstrakata odabranih vrsta Rosa na aktivnost enzima acetilholinesteraze i rast tumorskih i netumorskih ćelija.   Sumiranjem dobijenih rezultata može se zaključiti da sveži i suvi plodovi ispitivanih vrsta Rosa, kao i voćne kaše i džemovi predstavljaju značajan izvor vitamina C i fenolnih jedinjenja, sa elagnom kiselinom kao najzastupljenijom fenolnom komponentom. Takođe u pojedinim ekstraktima vrsta R. dumetorum i R. tomentosa detektovana je visoka koncentracija ursolne kiseline, dok je hinska kiselina prisutna u značajnoj koncentraciji u svim ispitivanim ekstraktima.   Ekstrakti ispitivanih vrsta, izuzev vrste Rosa arvensis, pokazali su visok antioksidantni potencijal koji se ogleda u njihovoj sposobnosti neutralizacije nekoliko radikalskih vrsta, redukcionom potencijalu i sposobnosti inhibicije lipidne peroksidacije. Ispitivani ekstrakti ispoljili su umerenu antiinflamatornu aktivnost u pogledu inhibicije produkcije odabranih metabolita ciklooksigenaznog (12-HHT, TXB2, PGE 2) i 12-lipooksigenaznog (12-HETE) metaboličkog puta arahidonske kiseline,  posebno prostaglandina E  . Takođe, in vitro ispitivanjem uticaja ekstrakata odabranih vrsta Rosa na aktivnost acetilholinesteraze pokazana je umerena aktivnost. Vodeni ekstrakti i ekstrakti voćnih kaša vrsta R. canina, R. tomentosa i R. sempervirens pokazali su umereni inhibitorni potencijal prema rastu HeLa ćelijske linije, dok su ekstrakti vrste R. sempervirens pokazali aktivnost i prema HT-29 ćelijama. Dobijeni rezultati ukazuju na značajni potencijal plodova i tradicionalnih proizvoda ispitivanih vrsta Rosa za upotrebu u proizvodnji nutraceutika i funkcionalne hrane.
   The aim of presented doctoral thesis was investigation of phytochemical composition and biological activity of water and methanol extracts of fresh and air-  dried rose hips, as well as purée and jam made according to traditional recipe of  hips of six wild growing Rosa L. species: R. canina, R. dumalis, R. dumetorum, R.  tomentosa, R. arvensis, and R. sempervirens. Examination of phytochemical composition included LC-MS/MS analysis of 64 selected phenolic compounds, quinic  acid (organic acid) and three triterpenoids. Also, total phenolic and flavonoid contents, as well as vitamin C contents were determined spectrophotometrically. Biological activity evaluation of extracts of six Rosa species included in vitro investigation of antioxidant, anti- inflammatory, anti-acetylcholinesterase and cytotoxic activity.   According to obtained results, fresh and air-dried rose hips, as well as their preserves present valuable source of vitamin C and phenolic compounds, especially  ellagic acid, which was the most abundant examined phenolic compound. Furthermore, high concentration of ursolic acid was detected in some Rosa   tomentosa and R.  rumetorum extracts, while notable concentration of quinic acid  was present in all examined extracts.   Extracts of all examined species, apart from Rosa arvensis, showed considerable antioxidant activity in terms of radical scavenging ability, reduction potential and inhibition of lipid peroxidation. Moreover, extracts exhibited moderate anti- inflammatory activity by means of inhibition of the main arachidonic acid metabolites   formed incyclooxygenase-1 (12-HHT, TXB2, PGE 2 ) and 12-lipoxygenase (12-HETE)  pathway, especially prostaglandin E2 . Also, investigation of anti- cetylcholinesterase  activity revealed moderate activity of extracts of all examined species. In addition,  predominantly water extracts of fresh andair-dried rose hips, as well as purée of R.  canina, R. tomentosa and R. sempervirens showed inhibitory activity toward HeLa, while R.sempervirens extracts also inhibited HT-29 cell growth. Presented results indicate significant potential of examined rose hips and their preserves for use as nutraceuticals and functional food.
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Zorica, Mrkonjić. "Fitohemijska karakterizacija i biohemijska ispitivanja plodova vrsta roda Sorbus L. 1753 (Rosaceae, Maloideae) kao izvora prirodnih nutraceutika." Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2017. https://www.cris.uns.ac.rs/record.jsf?recordId=104909&source=NDLTD&language=en.

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   Cilj ove doktorske disertacije predstavljao je ispitivanje fitohemijskog sastava i biološke aktivnosti vodenih i metanolnih ekstrakata svežih i suvih plodova, kao  i pekmeza  pripremljenog  po tradicionalnoj recepturi od plodova  četiri (od kojih se jedna javlja u dve forme)  samonike  vrsta  roda  Sorbus  L.:  S. aucuparia, S. domestica, S. torminalis  f.  torminalis, S. torminalis  f. semitorminalis  i  S. intermedia Ispitivanje fitohemijskog sastava obuhvatalo je LC-MS/MS analizu  44 odabrana fenolna jedinjenja  i  hinske kiseline (organska  kiselina). Takođe, spektrofotometrijski je  određen  sadržaj  ukupnih fenolnih i flavonoidnih jedinjenja, kao i  sadržaj askorbinske kiseline. Evaluacija biološke aktivnosti obuhvatala je  in vitro  ispitivanja antioksidantne aktivnosti, kao i ispitivanje uticaja ekstrakata odabranih vrsta  roda  Sorbus  na aktivnost enzima acetilholinesteraze, antimikrobni, kao i antiproliferativni potencijal.   Sumiranjem dobijenih rezultata može se zaključiti da sveži i suvi plodovi ispitivanih vrsta  Sorbus,  kao i  pekmezi  predstavljaju  umeren izvor  fenolnih jedinjenja.  Kao najzastupljenije fenolne kiseline izdvojile su se protokatehinska i  ferulna, a među flavonoidima amentoflavon i kvercetin-3-O-glukozid.  Pored toga, hinska kiselina je zabeležena u značajnoj količini u svim analiziranim ekstraktima.    Ekstrakti ispitivanih vrsta pokazali su  umeren  antioksidantni potencijal koji se ogleda u njihovoj sposobnosti neutralizacije nekoliko radikalskih vrsta, redukcionom potencijalu i sposobnosti inhibicije lipidne peroksidacije.  Ispitivanjem uticaja ekstrakata odabranih vrsta  Sorbus  naaktivnost  enzima  acetilholinesteraze  dokazana  je  jedino  umerena aktivnost  ekstrakata vrste  S. aucuparia.  Takođe, ispitivani ekstrakti  vrsta roda  Sorbus  ispoljili su umerenu  antimikrobnu  aktivnost u pogledu inhibicije  rasta Gram pozitivne bakterije,  Staphylococcus aureus, i Gram negativne bakterije,  Escherichia coli.  Vodeni i metanolni ekstrakti svežih i suvih plodova vrste  S. aucuparia  pokazali su umeren i inhibitorni potencijal prema rastu tumorskih (HeLa, MCF7, HT-29), ali i netumorskih ćelijskih linija (MRC-5).  Rezultati dobijeni u ovoj doktorskoj distertaciji  ukazuju na značajan  biopotencijal plodova i pekmeza  ispitivanih vrsta  Sorbus  i ukazuju na njihovu primenu u prehrambenoj industriji u vidu funkcionalne hrane.
The aim of presented  PhD  thesis was investigation of phytochemical composition and biological activity of water and methanol extracts of fresh and air-dried  fruits, as   well  as  jam,  made according to traditional recipe,  of fruits  of four  (one of them occurs in two forms)  wild growing  Sorbus  L. species:  S. aucuparia, S. domestica, S. torminalis  f. torminalis, S. torminalis f. semitorminalis and S. intermedia. Examination of phytochemical composition included LC-MS/MS analysis of 44 selected phenolic compounds  and  quinic acid (organic acid).  Also, total phenolic and flavonoid contents, as well as  ascorbic acid  content,  were determined spectrophotometrically. Biological activity evaluation of extracts of  Sorbus  species included  in vitro  investigation of antioxidant, anti-acetylcholinesterase, antimicrobial  and cytotoxic activity.   According to obtained results, fresh and air-dried  fruits, as well as jam  present  moderate  source of phenolic compounds. Amongs examined phenolic acids protocatechuic  and ferulic acids were the most abundant, and amongs investigated flavonoids amentoflavone and quercetin-3-O-glucoside wete present in noticeable amount.  Furthermore, high concentration of quinic acid was present in all examined extracts.   Extracts of all examined species showed  moderate   antioxidant activity in terms of radical scavenging ability, reduction potential and inhibition of lipid peroxidation.  Also, investigation of  anti-acetylcholinesterase activity revealed moderate activity only of extracts of S. aucuparia. Furthermore, examinated extracts of Sorbus species showedmoderate antimicrobial activity against Gram–positive bacteria, Staphylococcus aureus, and Gram-negative bacteria,  Escherichia coli.  In addition, water  and methanol  extracts of fresh and air-dried  fruits of  S.aucuparia  showed  inhibitory activity toward  tumor (HeLa, MCF7, HT-29), and also non-tumor (MRC-5) cell lines. Presented results indicate significant  biopotential of examined  fruits of  Sorbus  species  and  support their use in food industry as functional food.
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Li, Joy. "GPS interference mitigation for small UAV applications." Thesis, 2008. http://hdl.handle.net/2440/50719.

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The vulnerability of GPS to interference has been a major concern for both military and civilian applications, including small UAVs. Various signal processing techniques have been developed to improve the reliability of GPS receivers against different types of interference. Among these techniques, null steering is recognized as an effective method to protect GPS against both narrowband and broadband interference. However, due to the requirement of multiple antenna channels, it has mainly been implemented for large platform applications. This thesis examines the suitability of null steering techniques for small UAV applications and determines the practically achievable anti-jamming ability by implementing a two-element miniaturized adaptive antenna array. The adaptive antenna array is tested against a 2MHz broadband jamming signal under both laboratory testing conditions and a real jamming environment. Approximately 40dB anti-jamming range was achieved in the laboratory testing conditions. 38dB and 42dB were obtained in a real jamming environment with different antenna configuration. The likely performance limitations and possible further performance enhancements are also outlined in this thesis.
Thesis (M.Eng.Sc.) - University of Adelaide, School of Electrical and Electronic Engineering, 2008
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Chang, Shon-Wei, and 張雄偉. "Anti-jam Design of Fine-time Synchronization Algorithms in FH Satellite Systems." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/25270764683389740517.

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碩士
國立交通大學
電信工程研究所
86
In a frequency - hopped multiple access (FHMA) satellite communication system, the hopping clocks of the ground users must be synchronous with that of the transponder. This FH clock synchronization process is usually divided into two parts, namely, the coarse clock synchronization and fine - time synchronization. This thesis deals exclusively with the fine - time synchronization process. Because of the long round - trip delay between the ground users and the satellite, correct estimate of the clock timing error is made aboard the satellite and sent via the downlink to the ground users to adjust their carrier hop transition times. After a few closed - loop iterations, a ground user's signal arriving at the satellite receiver will be synchronous with the hop transition time of the dehopper. To carry out such a fine - time synchronization, a ground user would send a probe signal for a number of hop periods. Several estimation algorithms using the probe signal had been proposed. Among them, the so - called method F2,. which is based on an early - late filter technique to process the probe reponse, was shown to render the best overall performance. 　　Since the satellite FHMA system is designed for military applications, it is necessary to examine the anti - jam capability of such a system. Unfortunately, the F2 estimator is far from robust against jamming. We suggest practical solutions to save this estimator.Performance analysis of various modified estimators is presented. Numerical examples using either analytical results or computer simulations are provided to study the behaviors of the proposed new estimators under various jamming threats. It is shown that, with proper design, fine - time synchronization using probe signals can be accomplished even in the presence of jamming.
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8

張祖瑞. "Anti-Jam Performance of DFT-Based Acquisition Schemes for Frequency-Hopped Signals." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/14841945661067225950.

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碩士
國立交通大學
電機學院碩士在職專班電信組
95
As we are entering the information age, the communication security has become a more important issue than ever. Military communication systems are faced with the electronic warfare (EW) threat in the digitized battlefield. Communication jamming is one of the most-encountered EW threat. It is well known that the spread spectrum communications have the anti-jam capability against intentional jamming. In this thesis, we first review some basics of the satellite communications. Examples for Ka band link budget analysis in the adverse environment are given. We propose three different DFT-based discrete acquisition schemes for the acquisition of the frequency-hopped signals. The acquisition process proceeds in both time and frequency domain. The proposed schemes make acquisition in just one period become possible. Mathematical expressions for the detection probability and false alarm probability using various acquisition schemes in the ideal AWGN channel (noise power perfectly known), the non-ideal AWGN channel（noise power is estimated）, the non-ideal AWGN channel with broad-band noise jamming and partial-band noise jamming are derived. We also propose methods for the estimation and normalization of the noise and the noise-plus-jamming power in the jamming environment. The Debruijn sequence is adopted as the pseudo random hopping pattern generating sequence since it has a code length of power of 2. This allows an efficient computation for FFT algorithm. Finally, numerical results of the system performance for the aforementioned scenarios are presented. Besides, we also give numerical results using hopping patterns with a longer and a shorter period.
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Books on the topic "Anti-jam"

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Kavvadias, Vasilios Christos. Joint tactical anti-jam communications: A systems approach. Monterey, Calif: Naval Postgraduate School, 1989.

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2

United States Government US Army. Training Circular TC 6-02. 21 Secure Mobile Anti-Jam Reliable Tactical-Terminal (SMART-T) Handbook July 2019. Independently Published, 2019.

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Book chapters on the topic "Anti-jam"

1

Milstein, Laurence B. "An Introduction to Anti-Jam Performance of Spread Spectrum Communications." In Space Communication and Nuclear Scintillation, 418–49. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-017-5418-7_5.

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Zhang, Xudong. "Application of Improve Subspace Projection Technique in of GNSS Space–Time Anti-Jam Receiver." In Lecture Notes in Electrical Engineering, 555–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37398-5_51.

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Jerne, Christina. "The syntax of social movements: jam, boxes and other anti-mafia assemblages." In Reassembling Activism, Activating Assemblages, 26–42. Routledge, 2020. http://dx.doi.org/10.4324/9780429320798-2.

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Lin, Jan. "Introduction." In Taking Back the Boulevard, 1–16. NYU Press, 2019. http://dx.doi.org/10.18574/nyu/9781479809806.003.0001.

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The introduction features scenes from Northeast LA including a poem titled “Taco Truck” by Lisa Marie Sandoval that describes a nocturnal interaction between a college student and a Latino taco vendor and his family. The scene at the annual Lummis Day Festival is described by the author with respect to Northeast LA regional arts culture and community organizations and the mixing between established residents and newcomers. There follows a vignette on anti-gentrification protestors for housing rights who disrupt the Figueroa Jam a public arts and community engagement event sponsored by the LA Mayor’s Greet Streets program. Research method’s and the author’s positionality is discussed along with a profile of the book plan along with brief chapter reviews.
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Farhana, Nikhat. "Meticulous Endorsement of Black Seed and Jambolana: A Scientific Review." In Herbs and Spices - New Processing Technologies. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99225.

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The repository of traditional, historical and cultural heritage of natural prophylactic medicine to treat different disease, disorder and its aliment is limitless and time-immemorial. As per the hadith narrated by Ibn Abbas (RA), Prophet Muhammed specifically mentioned about Sulayman (AS) recorded the name and use of many herbal medicinal remedies after construction of his castle (Ibn Asakri’s Mukhtasar Tareekh Dimashq 3.393), in addition to it, Prophet Muhammed use to recommend 65 different herbal prophylactic medicines which are scientifically proved to be highly effective against almost all types of ailments, among this repository of 65, while prescribing the NS Prophet Muhammed narrated “use this black seeds regularly it is having the properties to cure all disease (ailment) except death (An authentic hadith narrated by Abu Hurayrah (RA) and recorded by Bukhari, Muslim Ahmad Ibn Majah). This in-depth review specially articulated to elaborate phytochemical, pharmacological and mechanistic approach to bring out the properties of not only NS but in addition, it focusing on the important properties of EJ. Preliminarily to say NS claim to have anti-inflammatory, analgesic, hepato-protective, neuro-protective, gastro-protective and other useful activity are due to two important constituents Thymoquinone (TQ) and NS oil (NSO). TQ has interaction with human serum albumin. Seeds containing volatile oils mainly Melanthin showed toxicity at larger doses. Whereas, EJ simultaneously proved its effectiveness underutilized fruit, crops are nutritious bearing wide range of pharmaceuticals properties. EJ fruit is highly perishable and is mainly used for the diabetes patients, it is well known as a traditional medicinal plant having essential bioactive compounds which are present in all parts of the plant. The major bioactive compounds present in the EJ roots are phytosterols, flavonoids, carotenoids, myricetin, oxalic acid, gallic acid, citronellol, cyanidin diglucoside, hotrienol, and polyphenols as well as micronutrients having many health benefits. It is also a good source of anthocyanin and effective against numerous health problems and act as chemo-preventive, radioprotective and demonstrating antineoplastic properties. The ripe fruits are pleasant, astringent taste and are eaten either raw or processed into different products mainly vinegar, jam, jellies and squash. The jambolana seed contains alkaloid, jambosine, and glycoside jambolin or antimellin. To be concluded, NS and EJ both bearing similar therapeutic and pharmacological endorsement with different remarkable biological active molecule, which will become future reference to find out the natural way to cure untreatable disease and its disorder such as HIV-Aids, Cancer and recent outbreak, etc. according to narration made by Prophet Muhammed .
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Conference papers on the topic "Anti-jam"

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Cerasoli, Carmen, and James Dimarogonas. "Geographic-Based Satellite Anti-Jam Strategies." In 28th AIAA International Communications Satellite Systems Conference (ICSSC-2010). Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-8809.

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Martel, Cedric. "Low profile and anti-jam GPS array." In 2013 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2013. http://dx.doi.org/10.1109/aps.2013.6711268.

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Zheng, Yue, Yikun Huang, and Yuanxun E. Wang. "Design of Small GPS Anti-Jam Antenna." In 2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2018. http://dx.doi.org/10.1109/apusncursinrsm.2018.8608862.

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Ding, Wang, and Zhao Yi-Xuan. "Multi-Subchannel Spread Spectrum for Anti-jam Communications." In 2012 International Conference on Industrial Control and Electronics Engineering (ICICEE). IEEE, 2012. http://dx.doi.org/10.1109/icicee.2012.50.

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Poberezhskiy, Y. S., and G. Y. Poberezhskiy. "On adaptive robustness approach to Anti-Jam signal processing." In 2013 IEEE Aerospace Conference. IEEE, 2013. http://dx.doi.org/10.1109/aero.2013.6496827.

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Farahmand, Shahrokh, Alfonso Cano, and Georgios B. Giannakis. "Anti-jam distributed MIMO decoding using wireless sensor networks." In ICASSP 2008 - 2008 IEEE International Conference on Acoustics, Speech and Signal Processing. IEEE, 2008. http://dx.doi.org/10.1109/icassp.2008.4518095.

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Cole, Chad A., Chowdhury Shahriar, and T. Charles Clancy. "An Anti-jam Communications Technique via Spatial Hiding Precoding." In 2014 IEEE Military Communications Conference (MILCOM). IEEE, 2014. http://dx.doi.org/10.1109/milcom.2014.88.

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KOLBA, DEAN, DAVID MVELROY, and WILLIAM CUMMINGS. "Lightweight EHF satellites for augmentation of anti-jam communications." In 14th International Communication Satellite Systems Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1992. http://dx.doi.org/10.2514/6.1992-1811.

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Keller, Steven D., Steven J. Weiss, Jeffrey A. Maloney, Do-Hoon Kwon, Ramakrishna Janaswamy, and John Morley. "Design Considerations for a Wearable Anti-Jam GPS Antenna." In 2018 2nd URSI Atlantic Radio Science Meeting (AT-RASC). IEEE, 2018. http://dx.doi.org/10.23919/ursi-at-rasc.2018.8471663.

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Meagher, Christopher J., Randall B. Olsen, and Robert C. Ferro. "Semi-automated Rotman lens design focusing on anti-jam performance." In 2010 IEEE International Conference on Wireless Information Technology and Systems (ICWITS). IEEE, 2010. http://dx.doi.org/10.1109/icwits.2010.5611915.

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Reports on the topic "Anti-jam"

1

Keller, Steven D. Anti-Jam GPS Antennas for Wearable Dismounted Soldier Navigation Systems. Fort Belvoir, VA: Defense Technical Information Center, June 2016. http://dx.doi.org/10.21236/ad1011921.

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Zoltowski, Michael D. NWV Topic 20 Jam-Proof Area Deniable Propagation: Anti-Jam Protection for GPS via Robust Efficient Space-Time Adaptive Processing. Fort Belvoir, VA: Defense Technical Information Center, October 2000. http://dx.doi.org/10.21236/ada384716.

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