To mitigate the leakage signal that obstructs the target information extraction in miniatured frequency modulated continuous wave (FMCW) radar system, an adaptive leakage signal cancellation algorithm is proposed in this paper. Without any help of the additional auxiliary path, all the processing for the intermediate frequency (IF) signal can be conducted in the digital domain. The basic principle to cancel leakage signal is to produce a cancelling signal, which has the same amplitude and anti-phase with the leakage signal. Differently, in this paper, the input phase parameter of the proposed method can be arbitrary and it can be modified by the corresponding corrected function. Besides, to acquire the phase noise in the leakage signal conveniently when generating cancelling signal, the information geometry theory is applied to transform the complex phase noise model into statistical characteristics calculation of the input signal. The effectiveness of the model and the proposed algorithm is verified by simulated results. Furthermore, a real FMCW system is designed to collect the practice echo signals. The resulting data denotes that the leakage signal in the received signal is greatly suppressed and the leakage signal power drops by −15.92 dB.

为了减轻阻碍小型调频连续波雷达系统目标信息提取的泄漏信号，提出了一种自适应泄漏信号消除算法。无需附加辅助路径的任何帮助，对中频（IF）信号的所有处理都可以在数字域中进行。消除泄漏信号的基本原理是产生一个消除信号，该信号具有与泄漏信号相同的幅度和反相。不同地，在本文中，所提出的方法的输入相位参数可以是任意的，并且可以通过相应的校正函数进行修改。此外，为了在产生抵消信号时方便地获取泄漏信号中的相位噪声，运用信息几何理论将复相位噪声模型转化为输入信号的统计特性计算。仿真结果验证了模型和所提算法的有效性。此外，设计了一个实际的FMCW系统来收集练习回波信号。结果数据表明，接收信号中的泄漏信号被大大抑制，泄漏信号功率下降了-15.92 dB。