一种新的PD雷达高精度速度跟踪方法和系统

提出的基于ＭＺＦＦＴ算法的动目标检测（搜索）速度跟踪新方法，与现行“距离门ＦＦＴ”体系相吻合（设距离门数为Ｐ，每门ＦＦＴ点数为Ｍ），能充分利用原有硬、软件资源，不增加硬件量，不增大ＦＦＴ芯片规模，就能使跟踪ＦＦＴ分辩率提高达Ｐ倍（约１－２个数量级）之多，等于直接作Ｎ＝ＰＭ点ＦＦＴ的精度和信噪比（相当于节省了一套专门为满足高精度、高信噪比跟踪而另设的Ｎ点ＦＦＴ系统，对机载、弹载、星载设备及轻小型地面ＰＤ雷达尤显重要）。并且比直接Ｎ点ＦＦＴ运算量小、实时性强，又打破了Ｎ为２的幂的限制；该处理方法和系统并行度高，进一步提高实时性的潜力巨大，方法简明，容易实现。

A New HighAccuracy VelocityTracking Approach and System for PD Radar

We succeeded in developing a much better detection and velocitytracking system for PD (Pulse Doppler) radar. Up to now, no one, to our best knowledge, has as yet succeeded in replacing FFT (Fast Fourier Transform) with ZFFT (Zoom FFT); so velocitytracking accuray has remained low. The difficulty appears to be that ZFFT can not realize both detection and tracking in one system. The algorithm we developed, MZFFT, can realize both functions in one system. The reason why we succeeded is because we utilized mapping principle. Compared with existing systems using FFT, where detection system and tracking system must be separate, our new MZFFT system can in principle improve tracking accuracy by least one order of magnitude. Simulation results (Fig.3) support preliminarily such a theoretical prediction.