PCAL信号多频点高效并行提取方法  

High Efficiency Parallel Extraction of Multi-Tone PCAL Signals

作　　者：姜坤 侯孝民 许可 赵成斌[3] 

机构地区：[1]装备学院 [2]航天飞行动力学技术重点实验室 [3]91206部队

出　　处：《飞行器测控学报》2012年第6期32-36,共5页Journal of Spacecraft TT&C Technology

基　　金：航天飞行动力学技术重点实验室开放基金资助项目(No.2012afdl013)

摘　　要：PCAL(相位校准)信号通常用于消除VLBI(甚长基线干涉测量)观测设备的附加时延。随着更高观测精度要求的提出,基带信号带宽不断增大,所包含的PCAL信号频点个数也随之增加。传统的基于相关法的PCAL信号提取方法在处理多频点信号时,其计算量随着频点个数的增加而大幅增长,计算效率低。针对该问题,利用PCAL信号各频点之间的频率特性,提出了一种基于FFT(快速傅里叶变换)的PCAL信号多频点高效并行提取方法,并对2种方法的计算精度和计算量进行了对比分析。仿真结果表明:新方法的计算精度与传统方法相当;计算量不随PCAL信号频点个数的增加而增大;随着提取频点个数的增加,新方法计算效率优势明显。PCAL（Phase Calibration） signal is usually used to eliminate the additional delay of VLBI（Very Long Baseline Interferometry） observation facilities.With higher requirements on observation accuracy,the bandwidth of baseband signal is expanding and the number of PCAL tones is on the increase.In terms of multi-tone PCAL signal extraction,the computational complexity of traditional correlation methods increases significantly with the increase of the number of multi-tones,and the computation efficiency decreases.A high efficiency parallel extraction method based on FFT（Fast Fourier Transform） is proposed to solve the problem making use of the frequency characteristics among PCAL signal tones.The computing accuracy and computational complexity between the two methods are compared and analyzed.Simulation results show that the computing accuracy of the two methods is similar while the computational complexity of the new method is independent on the number of PCAL tones.With increase of the number of PCAL tones,the computational efficiency of the new method has obvious superiority.

关 键 词：PCAL(相位校准) 多频点 FFT(快速傅里叶变换) 相关法 

分 类 号：P228.6[天文地球—大地测量学与测量工程]