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Research and implementation of Beidou navigation terminal antenna and anti-jamming algorithm

Author: ZhangPingPing
Tutor: WangZuo
School: Nanjing University of Technology and Engineering
Course: Circuits and Systems
Keywords: BeiDou satellite navigation system isolation miniaturization the powerinversion algorithm STAP MWF
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Type: Master's thesis
Year: 2014
Downloads: 64
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Abstract


Global satellite navigation system is widely used in many fields of military and civilian, which is an important space infrastructure, and is significant in political, military and society. BeiDou is a satellite navigation system by our country. For the navigation terminal equipment, it should be portable, so the design of antenna is not only equipped with satisfactory performance but also compact size. In addition, the BeiDou navigation terminal receiver is highly susceptible to electromagnetic interference, whatever it is intentional or unintentional. As a result, the anti-jamming capability of receiver is put forward. In this thesis, a few antennas are proposed for BeiDou navigation terminal and the adaptive anti-jamming algorithm is realized. The main work is as follows:First, a new tri-band antenna with low profile for BeiDou navigation terminal is designed with the help of previous work. Then, the improved isolation performance of antenna is achieved by optimizing the structure. Next, miniaturization technology is introduced. The new antenna with miniaturization is presented and another compact three layers antenna is designed. The results show that these antennas can work in a good performance.Second, this thesis introduces the adaptive algorithm and the weight vectors of different planar arrays and conformal array. Then, the power inversion algorithm is realized in space domain. Next, the space-time adaptive technology(STAP) is delivered. By changing the number of arrays, delays and the spacing of array element, STAP algorithm is simulated in Matlab, and the result indicates that STAP has a better anti-jamming capability than space filtering.Third, since the calculation of matrix inversion is quite complicated for application. Therefore, to simplify the calculation, a reduced-rank algorithm called MWF is introduced and simulated. Then some analysis for anti-jamming performance of channel mismatch is presented in Matlab. Finally the CSA-MWF algorithm is verified in DSP platform and Result shows that the algorithm can be better realized in hardware platforms.

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