航天电子对抗
航天電子對抗
항천전자대항
AEROSPACE ELECTRONIC WARFARE
2014年
4期
22-25
,共4页
伪码随机二相编码-线性调频(PRBC-LFM)%解线调%相位差分
偽碼隨機二相編碼-線性調頻(PRBC-LFM)%解線調%相位差分
위마수궤이상편마-선성조빈(PRBC-LFM)%해선조%상위차분
pseudo-random binary phase code and linear frequency modulation%dechirp%phase difference
针对伪码随机二相编码-线性调频复合信号的参数估计问题,提出了基于解线调与相位差分的盲估计方法。首先对信号进行平方,消除相位调制,然后用解线调估计出调频斜率,用重构的线性调频信号消除复合信号中的线性调频成分,用平滑的功率谱估计出起始频率,最后采用改进的相位差分进行码元宽度的估计与伪码序列的恢复。仿真结果验证了方法的有效性。
針對偽碼隨機二相編碼-線性調頻複閤信號的參數估計問題,提齣瞭基于解線調與相位差分的盲估計方法。首先對信號進行平方,消除相位調製,然後用解線調估計齣調頻斜率,用重構的線性調頻信號消除複閤信號中的線性調頻成分,用平滑的功率譜估計齣起始頻率,最後採用改進的相位差分進行碼元寬度的估計與偽碼序列的恢複。倣真結果驗證瞭方法的有效性。
침대위마수궤이상편마-선성조빈복합신호적삼수고계문제,제출료기우해선조여상위차분적맹고계방법。수선대신호진행평방,소제상위조제,연후용해선조고계출조빈사솔,용중구적선성조빈신호소제복합신호중적선성조빈성분,용평활적공솔보고계출기시빈솔,최후채용개진적상위차분진행마원관도적고계여위마서렬적회복。방진결과험증료방법적유효성。
A parameter estimation algorithm is proposed to blindly estimate reconnaissance signal combined PRBC and LFM ,based on dechirp and phase difference .Firstly ,the square of the received signal is computed to eliminate the phase modulation .Then ,dechirp is adopted to obtain chirp rate which is used to reconstruct signal to eliminate the LFM portion of received signal . And then , the initial frequency is estimated by smoothing the power spectrum .Finally ,improved phase difference is used to estimate the width of the symbol and recover the pseudo-code sequence .The results of simulation show the effectiveness of this algorithm .