中文摘要：

简单介绍了伪码调相与线性调频复合调制连续波／脉冲串体制探测系统的工作原理，详细推导了它们从带通滤波后至相关检测前这一过程中信号处理方面的信噪比增益，以及至相关检测后整个过程中信号处理方面的总信噪比增益。结果表明：1）脉冲复合体制的抗噪声性能优于连续波复合体制，前者在相干解调和相关处理上的信噪比增益是后者的α倍，信号处理的信噪比总增益是后者的α^2倍；2）伪码调相-线性调频复合连续波体制与伪码调相体制抗噪性能相同，伪码调相-线性调频复合脉冲体制与伪码调相体制的抗噪声性能相同。

英文摘要：

The principles of pseudo-random phase modulation （PM） and linear trequency mooulation （LFM） combined continuous wave （CW） pulse train detecting systems were described in brief. On this basis, their SNR gains （ GSNR） in signal processing from the back of band pass filter to the front of the correlation detection, and the overall SNR gains （GSNR, all） of the whole procedure after correlation detection were deduced in detail. The results show that 1 ） the performance of antinoise of pseudorandom PM-LFM combined pulse system is stronger than that of pseudo-random PM-LFM combined CW system, and the GSNR and GSNR,all of the former are a and α^2 times stronger than that of the latter; 2） the performance of antinoise of pseudo-random PM-LFM combined CW system is as strong as that of pseudo-random PM CW system, and the performance of antinoise of pulse train pseudo-random PM-LFM combined system is as strong as that of pulse train pseudo-random PM system.