电子学报
電子學報
전자학보
ACTA ELECTRONICA SINICA
2013年
12期
2397-2402
,共6页
罗海坤%王永庆%申宇瑶%吴嗣亮
囉海坤%王永慶%申宇瑤%吳嗣亮
라해곤%왕영경%신우요%오사량
大动态多普勒频率%微弱直扩信号%长时间积累%运动补偿
大動態多普勒頻率%微弱直擴信號%長時間積纍%運動補償
대동태다보륵빈솔%미약직확신호%장시간적루%운동보상
large dynamic Doppler frequency%weak DSSS signal%long-term integration%motion compensation
大动态多普勒频率情况下,微弱直扩信号的长时间积累存在积累损失和计算量急剧增加的问题。对此,本文提出一种基于运动补偿的二倍分组块补零算法,在二倍分组块补零算法的基础上,通过谱循环移位搜索多普勒频率,采用包络平移和Keystone变换补偿码多普勒频率。理论分析和仿真结果表明,新算法能有效消除大动态多普勒频率对长时间累积的影响,同时计算效率高,相干积累20ms时的计算量仅为同类算法的16%,且时间越长、优势越大。
大動態多普勒頻率情況下,微弱直擴信號的長時間積纍存在積纍損失和計算量急劇增加的問題。對此,本文提齣一種基于運動補償的二倍分組塊補零算法,在二倍分組塊補零算法的基礎上,通過譜循環移位搜索多普勒頻率,採用包絡平移和Keystone變換補償碼多普勒頻率。理論分析和倣真結果錶明,新算法能有效消除大動態多普勒頻率對長時間纍積的影響,同時計算效率高,相榦積纍20ms時的計算量僅為同類算法的16%,且時間越長、優勢越大。
대동태다보륵빈솔정황하,미약직확신호적장시간적루존재적루손실화계산량급극증가적문제。대차,본문제출일충기우운동보상적이배분조괴보령산법,재이배분조괴보령산법적기출상,통과보순배이위수색다보륵빈솔,채용포락평이화Keystone변환보상마다보륵빈솔。이론분석화방진결과표명,신산법능유효소제대동태다보륵빈솔대장시간루적적영향,동시계산효솔고,상간적루20ms시적계산량부위동류산법적16%,차시간월장、우세월대。
There exist integration loss and computational cost drastic increasing in long-term integration of weak DSSS (Di-rect Sequence Spread Spectrum )signal in large dynamic Doppler frequency scenarios .A motion compensation-double block zero padding algorithm is proposed to this problem ,which uses frequency spectrum cyclic shift for Doppler frequency searching ,envelope shifting and Keystone transform for code Doppler frequency compensation based on the double block zero padding algorithm .Theo-retical analysis and simulation results show that ,the proposed algorithm can eliminate the influence of large dynamic Doppler fre-quency effectively ,and has high computational efficiency ,the computational cost is 16% of the similar algorithm in 20ms coherent integration ,and the longer the time ,the higher the efficiency .