基于宽带调频步进信号的数字补偿方法研究

A digital compensation method based on wideband stepped frequency chirp signals

针对调频步进信号在宽频带大口径相控阵雷达的应用中受到孔径渡越时间限制的问题,在时域去斜法的基础上分析调频步进信号在线性宽频带相控阵雷达中的处理模型,提出一种基于时域全去斜的解决办法,即对调频步进信号的子脉冲信号进行全数字去斜。根据步进间隔值,对去斜后的子脉冲信号在时域进行时移并相干合成,最后使用数字本振调整频率和相位来补偿孔径渡越时间。结合理论分析仿真以及硬件系统验证了此方法的有效性和工程可实现性。

In view of the problem that the aperture fill time is limited for the stepped frequency chirpsignals （SFCS） in the application of the wideband phased array radars （PAR）, the processing mod？el of the SFCS in the linear broadband PAR is analyzed based on the time？domain de？chirp method.A solution is proposed based on the time？domain de？chirp method, in which the fully digital de？chirpoperation is performed on each sub？pulse signal of the SFCS. According to the step interval value,the sub？pulse signals are shifted in the time domain and coherently synthesized after the de？chirp op？eration. Finally, the digital LO is used to adjust the frequencies and phases to compensate the aper？ture fill time. The method is verified to be effective and feasible through the theoretical analysis andsimulation and the hardware system.