测试技术学报2025，Vol.39Issue(1)：7-12,6.DOI:10.62756/csjs.1671-7449.2025002
调制指数对PCM-FM遥测系统性能影响分析
Effect Analysis of Modulation Index on the Performance of PCM-FM Telemetry System
粟登银 1韩勇 1陈秋丰1
作者信息
- 1. 解放军63723部队,山西 忻州 036300
- 折叠
摘要
Abstract
To meet the needs of high bit rate telemetry data transmission,existing PCM-FM telemetry systems widely use MSD multi-symbol detection algorithm and TPC encoding and decoding technology,without increasing the volume and weight of the equipment and improving the transmission power.The modulation index is one of the important parameters in PCM-FM telemetry systems,which has a signifi-cant impact on system bandwidth and bit error rate.This article analyzes the principle of MSD multi-symbol detection algorithm.By calculating the cross-correlation coefficient and Matlab simulation,thein-fluence of modulation index size on bandwidth and bit error rate is analyzed.It is pointed out that setting the modulation index to 0.715 is more appropriate.The impact of modulation index deviation on signal-to-noise ratio loss was analyzed,and the phase grid diagram of multi symbol detection algorithm was used to analyze the impact of modulation index deviation on error and code synchronization.The fault-tolerant ability of different types of data on modulation index deviation was pointed out.关键词
PCM-FM/多符号检测/调制指数/偏差/随机数据/连"0"数据Key words
pluse code modulation frequency modulation(PCM-FM)/multiple symbol detection(MSD)/modulation index/deviation/random data/continuous"0"data分类
电子信息工程引用本文复制引用
粟登银,韩勇,陈秋丰..调制指数对PCM-FM遥测系统性能影响分析[J].测试技术学报,2025,39(1):7-12,6.
