【作者】 牛亚莉；

【导师】 苏涛；

【作者基本信息】 西安电子科技大学 ， 信号与信息处理， 2006， 硕士

【摘要】 正交插值与脉冲压缩算法是目前雷达接收机信号处理的常用算法。正交插值实际上是对接收到的回波实信号进行正交采样。过去的模拟方法难以保证IQ两路信号的正交性,随着数字信号处理技术的发展,直接中频采样的应用逐渐普及,旧的模拟下变频方式已经为新的数字下变频所取代。脉冲压缩则是为了很好的解决雷达的检测能力和分辨力之间的矛盾,这种技术以发射大时宽带宽信号然后对接收到的信号进行匹配滤波来实现。本文分析了在正交插值前端A/D变换中采样率的选择与正交插值低通滤波器的阶数的关系,得到公式化的表达式,可为正交采样参数设计提供参考;针对传统的正交插值及脉冲压缩算法中的波形畸变提出了改进方案,并通过仿真实验得到较好的效果;为扩大雷达的探测距离,提出部分脉压的方案,详细分析了其理论意义及实现方法。对雷达测速方法作了较为深入的研究,讨论了双通道测速法和正负斜率线性调频脉冲测速法。最后介绍了以上算法在DSP芯片TS101上的编程实现,总结了几种常用的DSP程序的优化方法。更多还原

【Abstract】 The algorithm quardrature sampling with pulse compression is most often used in modern Radar receiver. Quardrature sampling is, in fact, sampling in Radar’s echo signal to produce the inphase components I(n) and quadrature components Q(n). The former old analog way couldn’t assure the phase and amplitude performance of I/Q channel. But with the development of digital processing technique, the use of sampling in intermediate frequency is gradually popularized, old analog way has been replaced by new digital way. Pulse compression is in order to solve the conflict of radar’s ability to detect targets and to distinguish targets. This technique is realized by sending LFM signal of large time-width and bandwidth and then making matched filtering to the echo signal.This paper analysized the relationship between sampling frequency fs and the taps N of low pass filter in A/D transform and got a formula expression, which can give reference to the parameter design of quadrature sampling.; aiming at the wave distortion in traditional arithmetic of quadrature sampling with pulse compression, an improved algorithm has been studied and validated in Matlab and get perfecter result. In order to enlarge the detect distance of Radar, a method of part pulse compression is put forward, the realistic sense and the implement scheme is analysized. Further study is made on target velocity measurement of radar, double-channel filter method and another one which based on chirp up and chirp down signal are discussed. At last, all the algorithm discussed above are programmed on DSP TS101 and some typical programme optimizing ways in assembly language are summarized.更多还原