摘要
由于实时性和计算量上的要求,在实时雷达杂波模拟系统中利用网格划分法计算出来的杂波功率谱点数有限,一般不超过1 024点。为了提高模拟得到的时域杂波序列的频率分辨率,改善由于在DSP上46 ms内重复使用同一段序列所导致的周期性,特别引入了最大熵外推算法及其改进的梯度格型快速自适应算法,扩大了时域序列的点数。实践证明,使用该外推方法可以在保证实时性的前提下,将杂波重构过程频率分辨率提高1倍。
Because of the request of real-time performance and computation, the quantity of power spectrum points computed by griddingpartition method in real-time simulation system of radar clutter is limited,usually less than 1 024 .In order to enhance the frequency resolution of clutter sequences and improve the periodicity caused by repeated use in 46 ms in DSP system, maximum entropy extrapolation algorithm and G - L algorithm are proposed, the length of sequences is expanded. It is proved this extrapolation algorithm can enhance frequency resolution by one time on the premise of satisfying real-time performance.
出处
《无线电工程》
2006年第6期59-60,64,共3页
Radio Engineering
