摘要
针对传统捕获算法在星载扩频信号上捕获性能的不足,提出了一种基于分段匹配滤波器和快速傅里叶变换的高动态快速捕获(Partial Match Filter-Fast Fourier Transform,PMF-FFT)算法。在详细分析了PMF-FFT的数学模型和改进方法的基础上,对PMF模块和FFT模块分别加调谐系数为1.712的改进窗,大幅度降低了捕获系统的输出增益衰减和扇贝损失,并且算法捕获时间缩短至45 ms。在基于XC7V690T的星载应答机上对该算法的捕获性能进行验证,结果表明,改进后的算法将在大多普勒下的捕获时间缩短至2 s。
Aiming at the shortage of traditional capture algorithms in the capture performance on the satellite-based spread spectrum signal,a high-speed,high dynamic fast capture algorithm based on segmented matched filter and fast Fourier transform(Partial Match Filter-Fast Fourier Transform,PMF-FFT)algorithm is proposed.The mathematical model and the improved method of PMF-FFT are analyzed in detail,and an improvement window with a tuning factor of 1.712 is added to the PMF module and FFT module respectively,which significantly reduces the output gain fading and scallop loss of the capture system,and the algorithm capture time is shortened to 45 ms.The capture performance of the algorithm is verified on the spaceborne transponder based on XC7V690T,and the results indicate that the capture time of the improved algorithm under large Doppler is shortened to 2 s.
作者
王家明
孙晨
何勇
殷鹏程
张博
WANG Jiaming;SUN Chen;HE Yong;YIN Pengcheng;ZHANG Bo(Shanghai Aerospace Electronic Technology Institute,Shanghai 201109,China)
出处
《通信技术》
2022年第7期844-849,共6页
Communications Technology
关键词
PMF-FFT
扩频通信
扇贝损失
加窗
PMF-FFT
spread spectrum communication
scallop loss
add window
