基于数字变带宽的雷达数字中频信道化设计*

摘要

To simplify radar IF digital receiver design which needs various bandwidth,a digital-bandwidth adjust-ment method is proposed to change the receiver′s bandwidth . Firstly,this method and conventional analog-band-width adjustment are compared and analyzed to show the advantage in reducing variable bandwidth receiver de-sign complexity . Then this method is proved to be feasible by modeling and simulating . Finally,it is validated by measuring a radar return signal on the spot,and the experimental data is basically in accordance with that of sim-ulation . The results shows that the method doesn′t affect receiver output SNR(Signal-to-Noise Ratio)and can simply complishes many bandwidth adjustments in digital domain,so it possesses feasibility and engineering ap-plicability in real radar channel design .%　　在雷达中频数字信道化中为了简化实现多种带宽的设计要求，提出了数字变带宽设计方法改变接收信道的带宽。首先，与传统的模拟变带宽的设计方法比较分析表明，该方法具有降低多带宽接收信道设计复杂程度的优点；然后，通过建立理论模型，对其进行仿真和分析，理论原理可行。最后通过实测某雷达回波信号进行验证，仿真结果和实测结果基本一致。结果表明，该方法不影响接收信道输出信噪比，同时又能简单实现接收信道的多种带宽改变，具有可行性和工程实用性。