宽带雷达信号的多通道低速率采样方法

Approach to sample the broadband radar signal with multi-channel and low-rate ADC

对宽带雷达信号直接采样要求模数转换器具有高采样速率,这将导致采样精度降低并且难以实现。采用将宽带拟信号进行多通道、低速率采样的思路,提出了一种利用自适应波束形成技术恢复信号完整带宽的新方法。低整速率ADC将使采样后信号的频谱发生混叠,该方法将多通道频域采样输出看作阵列输出,利用稳健的自适应处理技术取出所有混叠的频谱,最后将它们拼接成完整的宽带信号。此方法可以同时实现低采样速率与高精度,而且对通道延迟及其它误差稳健。

To directly sample broadband radar signal with high-rate analog-to-digital convertr（ADC） suffers from high cost and low sampling precision. The idea that using multiple low rate ADCs performs sampling broadband signal is introduced, then a novel method of utilizing adaptive beam forming technique to recover complete bandwidth of the broadband signal is presented. Using the low rate ADCs will make the spectrum of the sampled signal aliasing. In this method the sampling output of multichannel in frequency domain is taken as array output, then, all aliasing spectrum is extracted by using robust adaptive processing technique, finally, the extracted spectrums are rejoined to form a complete broad spectrum signal. This approach has the advantages of low cost, low sampling rate, high precision and easy implementation, and it is robust to channel errors.