【摘要】：針對陣列天線衛(wèi)星移動通信抗干擾能力差、傳播損耗大等特性,設計了一種數字波束形成技術(DBF)和擴頻技術相結合的數字接收機。其中,DBF算法采用基于遞歸最小均方算法(RLS)的解擴重擴盲自適應波束形成算法,使用VxWorks實現權值計算,FPGA實現波束形成;擴頻方式采用直接序列擴頻,在FPGA中實現。仿真分析與樣機測試顯示,通過兩項技術聯合使用,在信噪比低至-45 dB條件下仍可以實現可靠通信,同時有效加強了系統抗干擾能力。
[Abstract]:A digital receiver combining digital beamforming (DBF) and spread spectrum (SS) technology is designed to solve the problem of poor anti-jamming and high propagation loss of antenna array satellite mobile communication. Among them, the DBF algorithm adopts the blind adaptive beamforming algorithm of despreading and respreading based on the recursive least mean square algorithm (RLS), uses VxWorks to calculate the weights and FPGA to realize the beamforming, and the spread spectrum adopts direct sequence spread spectrum, which is implemented in FPGA. Simulation analysis and prototype test show that the system can communicate reliably under the condition of low SNR up to -45 dB, and the anti-jamming ability of the system can be effectively enhanced by using the two techniques together.
【作者單位】： 中國科學技術大學核探測與核電子學國家重點實驗室;中國科學技術大學近代物理系物理電子學安徽省重點實驗室;北京空間信息中繼傳輸技術研究中心;
【分類號】：TN927.23
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本文編號：2277867