研究射频噪声干扰、噪声调幅干扰、噪声调频干扰和噪声调相干扰对脉压的干扰效果, 从 4种有源噪声干扰信号的功率谱密度、干扰带宽及干扰功率等特征上对照分析了各自的干扰特性, 然后通过理论推导, 得到了在线性调频( LFM)脉冲压缩滤波器下不同干扰的特征变化, 以及脉压对有效干扰带宽和功率压制比的影响, 给出了脉压干扰效应的若干结论, 并用仿真验证了结论的正确性。研究结果表明, 脉压后的有效干扰带宽与干扰中心频率对信号载频的瞄准误差和两者的带宽重叠度有关, 而且脉压处理使输出干扰功率与输入干扰功率的比值为脉压后的有效干扰带宽与脉压前的干扰带宽之比。此外, 脉压后功率压制比也与有效干扰带宽和脉压前的干扰带宽的比值成正比。

It can reflect profoundly the interference effects and provide the basis on the designs of jamming and anti-jamming to understand the specific effects of typical active noise interferences for radar signal processing. The thesis is focused on the interference effects of pulse compression by Radio Frequency noise, Noise Amplitude Modulation jamming, Noise Frequency Modulation jamming and Noise Phase Modulation jamming. First, their characteristics are compared according to power spectral density, bandwidth and power of four active jamming modes. Then, by theoretical deduction, the changes of different jamming methods and the influences on effective interference bandwidth and power suppression ratio under the Linear Frequency Modulation(LFM) pulse compression are studied. Finally, the influences of active interference on pulse compression are concluded and simulations are performed to validate their correctness. Results show that the effective interference bandwidth after pulse compression is related tothe sighting error of jamming center frequency, the signal carrier frequency and the bandwidth overlap; and the ratio of output interference power to input interference power is equal to the ratio of effective interference bandwidth to interference bandwidth before pulse compression. Besides, the power suppression ratio is also proportional to the ratio of effective interference bandwidth to bandwidth before pulse compression.