CAJ | 학술논문

针对目前算法中线性调频-伪码( LFM-PRBC)复合信号参数估计计算量较大的问题，提出了一种快速估计算法。该算法采用相关检测与解线调进行参数的估计。首先对信号进行平方以消除相位调制，然后由自相关的峰值距离估计出码元宽度，由互相关的正负恢复出编码规律，再根据延时直接对信号解线调，最终估计出调频斜率与起始频率。仿真结果表明，该算法在低信噪比( SNR)下具有较好的估计性能。
침대목전산법중선성조빈-위마( LFM-PRBC)복합신호삼수고계계산량교대적문제，제출료일충쾌속고계산법。해산법채용상관검측여해선조진행삼수적고계。수선대신호진행평방이소제상위조제，연후유자상관적봉치거리고계출마원관도，유호상관적정부회복출편마규률，재근거연시직접대신호해선조，최종고계출조빈사솔여기시빈솔。방진결과표명，해산법재저신조비( SNR)하구유교호적고계성능。
To solve the problem that the parameter estimation of linear frequency modulation-pseudo random binary codes ( LFM-PRBC) combined signal requires a large amount of compu-tation in current algorithms, a fast parameter estimation algorithm which uses correlation detec-tion and dechirp is proposed. Firstly, the square of the received signal is computed to eliminate the phase modulation. Then, the width of the symbol is estimated from the peak distance of auto-correlation. The sign of the cross-correlation is used to recover the pseudo-code sequence. Fi-nally, dechirp is directly adopted to obtain chirp rate and the initial frequency according to the delay of the signal. The results of simulation show that this algorithm has a good performance un-der low Signal-to-Noise Ratio ( SNR) .