一种基于射频对消的连续波雷达收发前端设计

Design of CW radar transceiver front-end based on RF cancellation

为解决发射信号的泄漏影响回波信号的接收问题,给出了一种基于射频对消技术的双频连续波雷达收发前端设计方法.该设计采用锁相技术实现一路X波段双频(10.2 GHz和10.22 GHz)连续波发射信号的产生,并通过四路接收通道实现双频连续波回波信号的接收,输出16路模拟中频信号.完成对发射通道、接收通道、中频滤波器和双频射频对消电路的设计及系统电路的优化,给出了对收发前端的测试.测试结果表明,利用双频连续波射频对消技术抑制雷达发射信号泄漏的效果明显,其技术指标均满足该雷达的设计要求.

In order to solve the problem of the leakage of transmitting signals affecting the reception of echo signals, this paper proposes a design method of transceiver front-end of double frequency CW radar based on RF cancellation techniques. In this scheme, one channel of double frequency CW transmitting signals in X-band is generated by using the PLL technology（two frequencies are respectively 10.2 GHz and 10.22 GHz）, and the reception of echo signals of the double frequency CW is achieved by taking four receiving channels, thus outputting the 16 channels of analog IF signals. By designing the transmitting and receiving channels, the IF filter and the double-frequency RF cancellation circuits, as well as optimizing the system circuits, the test of transceiver front-end is presented. The test results show that the effect of suppressing the leakage of radar transmitting signals is evident, by using the double frequency CW RF cancellation, and its technical all meet the designing demand of this type of radar.