一种基于FPGA的自适应射频对消方法

An FPGA-Based Adaptive RF Cancellation Method

针对单天线调频连续波(FMCW)雷达的发射信号泄漏进接收通道,恶化接收机灵敏度,使接收机前端饱和的问题。本文基于最小均方(LMS)自适应算法,利用FPGA实时对消泄漏进接收通道的发射信号,有效提高单天线FMCW雷达收发间的隔离度。在X波段单天线FMCW雷达平台上,测试结果表明,泄漏进接收通道的发射信号可以达到40dB的对消深度,表明该方法的有效性。

FMCW radar with single antenna causes leakage of transmitting signals into the receiver, which can degrade the receiver sensitivity and saturate the receiver. Based on LMS adaptive algorithm, an FPGA-based method is proposed to cancel transmitting signals leaked into the receiver in real time, which highly improves isolation between transmitter and receiver of the radar. An X-band single-antenna FMCW radar is used as a test platform. Test results show a cancellation depth of 40dB, which proves the effectiveness of the proposed method.