一种应用于测控模拟验证设备的伪码捕获方案

依据设备指标基于FFT循环相关算法提出了一种扩频伪码捕获方案。采用相干累加和 恒虚警门限设置对方案进行了改进并完成了检测模型的特性分析及周期累加次数的确定，同 时基于FPGA设计了循环相关模块和峰值检波模块的实现框架。仿真分析表明，此方案满足现 实需求，具有很强的实用价值。

A new PN code acquisition scheme used in TT&C simulation equipment

According to the equipment indexes and based on FFT circulation relate d algorithm, this paper proposes a spread spectrum Pseudo Noise (PN) code acquis ition scheme. Coherent accumulation and Constant False Alarm Rate (CFAR) thresho ld setting are adopted to improve the scheme. The characteristic analysis of CFA R detection model and choice of times about cyclical accumulation are completed. Implementation frameworks for circulation related module and peak detector modu le based on Field Programmable Gate Array (FPGA) are designed. Simulation and analysis show that the scheme meets practical need and must be of great practi cal value.