电讯技术
電訊技術
전신기술
TELECOMMUNICATIONS ENGINEERING
2014年
10期
1418-1423
,共6页
卫星移动通信%阵列天线%数字接收机%盲自适应波束形成%直接序列扩频
衛星移動通信%陣列天線%數字接收機%盲自適應波束形成%直接序列擴頻
위성이동통신%진렬천선%수자접수궤%맹자괄응파속형성%직접서렬확빈
satellite mobile communication%array-antenna%digital receiver%adaptive blind DBF%direct se-quence spread spectrum
针对阵列天线卫星移动通信抗干扰能力差、传播损耗大等特性,设计了一种数字波束形成技术( DBF)和扩频技术相结合的数字接收机。其中,DBF算法采用基于递归最小均方算法( RLS)的解扩重扩盲自适应波束形成算法,使用VxWorks实现权值计算,FPGA实现波束形成；扩频方式采用直接序列扩频,在FPGA中实现。仿真分析与样机测试显示,通过两项技术联合使用,在信噪比低至-45 dB条件下仍可以实现可靠通信,同时有效加强了系统抗干扰能力。
針對陣列天線衛星移動通信抗榦擾能力差、傳播損耗大等特性,設計瞭一種數字波束形成技術( DBF)和擴頻技術相結閤的數字接收機。其中,DBF算法採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；擴頻方式採用直接序列擴頻,在FPGA中實現。倣真分析與樣機測試顯示,通過兩項技術聯閤使用,在信譟比低至-45 dB條件下仍可以實現可靠通信,同時有效加彊瞭繫統抗榦擾能力。
침대진렬천선위성이동통신항간우능력차、전파손모대등특성,설계료일충수자파속형성기술( DBF)화확빈기술상결합적수자접수궤。기중,DBF산법채용기우체귀최소균방산법( RLS)적해확중확맹자괄응파속형성산법,사용VxWorks실현권치계산,FPGA실현파속형성；확빈방식채용직접서렬확빈,재FPGA중실현。방진분석여양궤측시현시,통과량항기술연합사용,재신조비저지-45 dB조건하잉가이실현가고통신,동시유효가강료계통항간우능력。
In order to improve the anti-interference ability and reduce the propagation loss for the multi-antenna satellite mobile communication, a novel digital receiver is proposed. This receiver combines the digital beamforming( DBF) technology and the spread spectrum technology. The DBF algorithm is adaptive blind beamforming based on the recursive least square( RLS) method and the despread-respread method, which is implemented by VxWorks and FPGA. The spread spectrum mode is direct sequence( DS) spread spectrum,which is implemented by FPGA. Simulation and prototype test results show that the digital re-ceiver can ensure the reliability of satellite communication at lower signal-to-noise ratio( under -45 dB) and improve the anti-interference ability.
