摘要
时差测量精度是定位技术的关键指标。传统模拟法的时差测量精度随输入信号的沿宽加大而变坏(相同信噪比),当信号沿宽达到1500ns时,其时差测量精度已不能满足定位系统的要求。而数字相关法能适应不同沿宽的雷达信号时差的高精度测量。介绍了利用A/D、DSP和FPGA等器件搭建的硬件系统来实现数字相关法时差测量的方法。重点讨论了A/D采样模式、数字滤波、相关算法简化、插值技术及最终数据的统计处理。该方法具有一定的普遍适用性。
Precision of measuring time-delay is key index of orientation technology. Precision of measuring time delay by analog facility is worse as so as edge width of input signal is bigger. But measuring time-delay by digital correlation can adapt all radar signal of difference edge width. Digital facility consists of A/D, FPGA, DSP, etc. Importance discussion is sampling mode of A/D,digital filtering, predigestion of correlation arithme tic, insert technic, statistic disposal.
出处
《航天电子对抗》
2006年第6期39-43,共5页
Aerospace Electronic Warfare
关键词
时差测量
数字相关
数字滤波
抛物线插值
time-delay measure
digital correlation digital filtering
parabola insert
