Improving Signal Security of Secondary Surveillance RADAR by Using Direct Sequence Spread Spectrum Technology
Secondary radars are important equipment in the aviation industry. The basis of this system is the use of the L-band Q&A system for aircraft identification. In this paper, the design of a secondary radar system based on a broad spectrum of direct sequence architecture is proposed. The main purpo...
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| Format: | Article |
| Language: | English |
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AJA Command and Staff University
2020-08-01
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| Series: | علوم و فنون نظامی |
| Subjects: | |
| Online Access: | http://www.qjmst.ir/article_46532_add021fcc33a8fc4241a83f0427b770c.pdf |
| _version_ | 1819274027368185856 |
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| author | Jafar Khalilpur Mohammad Farahmand rad |
| author_facet | Jafar Khalilpur Mohammad Farahmand rad |
| author_sort | Jafar Khalilpur |
| collection | DOAJ |
| description | Secondary radars are important equipment in the aviation industry. The basis of this system is the use of the L-band Q&A system for aircraft identification. In this paper, the design of a secondary radar system based on a broad spectrum of direct sequence architecture is proposed. The main purpose of this project is to increase the resistance of the system to noise disturbances and to equip the secondary radar system with LPI signals. For this purpose, the proposed scheme offers two different working modes, namely Z1 and Z2 modes. The practical implementation of the scheme is based on the BPSK modulation of a broad spectrum direct sequence architecture, whose initial synchronization is based on the matching filter and final synchronization using the Split Bit method (such as link 16). In Z1 mode (as normal system mode), a 32-bit word is achieved by processing 14.9 dB. Also in the design of the Z2 mode (referred to as storage mode) by sending a 16-bit word, the processing gain is 21.03 dB. The Z2 is intended for use in a noisy environment. The results of the system analysis show that in Z2 mode the effect of disturbance is reduced by 9.39 times compared to similar systems. The innovation of the proposal is to convert the secondary radar to radar with low probability and resistant to noise disturbance. |
| first_indexed | 2024-12-23T23:01:54Z |
| format | Article |
| id | doaj.art-d10252fa0aed44a9902cce3be63eedfa |
| institution | Directory Open Access Journal |
| issn | 2008-191X 2676-4520 |
| language | English |
| last_indexed | 2024-12-23T23:01:54Z |
| publishDate | 2020-08-01 |
| publisher | AJA Command and Staff University |
| record_format | Article |
| series | علوم و فنون نظامی |
| spelling | doaj.art-d10252fa0aed44a9902cce3be63eedfa2022-12-21T17:26:54ZengAJA Command and Staff Universityعلوم و فنون نظامی2008-191X2676-45202020-08-011652295010.22034/qjmst.2020.4653246532Improving Signal Security of Secondary Surveillance RADAR by Using Direct Sequence Spread Spectrum TechnologyJafar Khalilpur0Mohammad Farahmand rad1Associate Professor, Khatam Al-Anbia University of Air Defense, Tehran, Iran.Researcher of Khatam Al-Anbia Air Defense University, Tehran, Iran.Secondary radars are important equipment in the aviation industry. The basis of this system is the use of the L-band Q&A system for aircraft identification. In this paper, the design of a secondary radar system based on a broad spectrum of direct sequence architecture is proposed. The main purpose of this project is to increase the resistance of the system to noise disturbances and to equip the secondary radar system with LPI signals. For this purpose, the proposed scheme offers two different working modes, namely Z1 and Z2 modes. The practical implementation of the scheme is based on the BPSK modulation of a broad spectrum direct sequence architecture, whose initial synchronization is based on the matching filter and final synchronization using the Split Bit method (such as link 16). In Z1 mode (as normal system mode), a 32-bit word is achieved by processing 14.9 dB. Also in the design of the Z2 mode (referred to as storage mode) by sending a 16-bit word, the processing gain is 21.03 dB. The Z2 is intended for use in a noisy environment. The results of the system analysis show that in Z2 mode the effect of disturbance is reduced by 9.39 times compared to similar systems. The innovation of the proposal is to convert the secondary radar to radar with low probability and resistant to noise disturbance.http://www.qjmst.ir/article_46532_add021fcc33a8fc4241a83f0427b770c.pdfsecondary surveillance radarspread spectrumdirect sequenceprocessing gainlow probability of intercept (lpi) |
| spellingShingle | Jafar Khalilpur Mohammad Farahmand rad Improving Signal Security of Secondary Surveillance RADAR by Using Direct Sequence Spread Spectrum Technology علوم و فنون نظامی secondary surveillance radar spread spectrum direct sequence processing gain low probability of intercept (lpi) |
| title | Improving Signal Security of Secondary Surveillance RADAR by Using Direct Sequence Spread Spectrum Technology |
| title_full | Improving Signal Security of Secondary Surveillance RADAR by Using Direct Sequence Spread Spectrum Technology |
| title_fullStr | Improving Signal Security of Secondary Surveillance RADAR by Using Direct Sequence Spread Spectrum Technology |
| title_full_unstemmed | Improving Signal Security of Secondary Surveillance RADAR by Using Direct Sequence Spread Spectrum Technology |
| title_short | Improving Signal Security of Secondary Surveillance RADAR by Using Direct Sequence Spread Spectrum Technology |
| title_sort | improving signal security of secondary surveillance radar by using direct sequence spread spectrum technology |
| topic | secondary surveillance radar spread spectrum direct sequence processing gain low probability of intercept (lpi) |
| url | http://www.qjmst.ir/article_46532_add021fcc33a8fc4241a83f0427b770c.pdf |
| work_keys_str_mv | AT jafarkhalilpur improvingsignalsecurityofsecondarysurveillanceradarbyusingdirectsequencespreadspectrumtechnology AT mohammadfarahmandrad improvingsignalsecurityofsecondarysurveillanceradarbyusingdirectsequencespreadspectrumtechnology |