CAJ | 학술논문

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。
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 .