毫米波宽带雷达相位误差校正方法研究

为了有效解决相位误差对于步进频信号合成高分辨的影响,在分析步进频雷达相位误差来源的基础上,提出了一种相位误差校正方法。理想情况下,频率步进信号为相参信号,脉冲间的相位具有线性关系,相邻脉冲间的相位差恒定。随机相位误差的存在,破坏了频率步进信号的相参性,导致合成高分辨结果旁瓣峰值电平提高,噪声基底抬高。合成高分辨前,利用相邻脉冲接收信号相位差与均值的差值对采样信号进行相位补偿,可以一定程度上校正相位误差对步进频信号的影响。对仿真数据与实测数据的处理结果表明,该方法可有效提高频率步进体制雷达的检测性能。

Study on phase error calibration method for stepped frequency radar

To decrease the influence of phase errors on the high range resolution profile for stepped frequency radar effectively,a calibration method of phase errors is proposed,based on analyzing the factors resulting in phase errors.Under the ideal situation,stepped frequency is a kind of coherent signal.The phase between pulses is linear as well as the phase difference between neighbor pulse is constant.However,the phase errors destroy the coherence of stepped frequency signal,which increase the amplitude of sidelobe.Compensating the phase of echo with the difference between phase error and phase error mean can restrain the influence of phase error on stepped frequency to some extent.The algorithm is verified by both simulation and experimental data.