摘要
针对高灵敏度深空应答机的载波捕获,研究了一种快速解线调载波捕获算法。分析了算法的原理和实现方案。仿真和FPGA实现结果表明:该算法可准确捕获信噪比极低和多普勒动态范围极大的信号。针对算法的实际应用,给出了算法在不同工作模式下的参数设置,并对其资源占用、捕获时间和检测概率进行了计算,进一步说明了算法的工程可实现性。
A carrier acquisition algorithm based on fast estimation of linear-frequency modulated （LFM） signal was studied for the carrier acquisition of the deep space transponder in this paper. The principle and the system solution of the algorithm were analyzed. The simulation and FPGA results showed that the algorithm was effective in the conditions of extremely-low-SNR and high-dynamic-Doppler. The parameter setting of the algorithm for every operating mode was given out. The cost of hardware resource, acquisition time and detection probability were also calculated to evaluate the practical value of the algorithm.
出处
《上海航天》
2015年第2期32-37,68,共7页
Aerospace Shanghai
关键词
深空应答机
灵敏度
多普勒频移
载波捕获
Deep space transponder
Sensitivity
Doppler shift
Carrier acquisition
