基于FPGA的扩频测距快速捕获方法研究

Fast Acquisition for Distance Measurement with Spread Spectrum Technique Based on FPGA

传统航天测控系统大部分存在多副载波相互干扰,定位精度低,抗干扰能力差,设备复杂等缺点。为了满足未来深空宇航和电子战环境对航天测控系统的要求,扩频测距,数字综合基带传输等技术已成为新一代航天测控系统的关键技术,它对提高测距定位精度,抑制干扰,扩大航天测控系统的作用范围,减少设备复杂度,适应电子对抗要求等具有明显的优势。本文分析了扩频测距的理论原理与优势,给出了一种基于FPGA的扩频测距方案,以及实现快速测距的方法,在理论上和硬件实现上均能很好的解决传统测控系统存在的问题。

Multi-carrier wave interference, low precision and complex measure equipments restrict the improvement of the aero measurement. Considering of the requirement for electro-war and inner space navigation, many new techniques such as spread spectrum and ASIC have become into key techniques. It can improve the measurement even in very low SNR(-15dB)~[2]. Here we give a fast algorithm for distance measurement with Spread Spectrum Technique based on FPGA. a simulation result is also given, which can solve the problems coexisting with the conventional detection and control System.