电讯技术Issue(9)：1234-1237,4.DOI:10.3969/j.issn.1001-893x.2013.09.022
FM遥测解调自动极性纠反功能的改进设计
An Improved Design for Auto Polarity Revising of FM Telemetry Demodulation
刘洋 1赵文华 2何晶 1邹春华 2王喜权1
作者信息
- 1. 中国卫星海上测控部，江苏江阴214431
- 2. 飞行器海上测量与控制联合实验室，江苏江阴214431
- 折叠
摘要
Abstract
This paper proposes the background of automatic polarity correction function of telemetry demodulation unit from the false polarity revising by high error code under the different channel frequency conversion mode . Then it analyzes the principle of automatic polarity correction design by two kinds of judge logic of identifying the frame polarity under the searching state and the chechout/lock state . With the evidence of the simulating test the bug has been found that high error code can result in error on the second identifying wheather the frame polarityequals 1 after the frame polarity synchronization reverse code emerges . Finally,the bug is removed by adopting the modification of identifying the frame polarity as 1 just by whether difference probability accumulation exceeds half length of frame synchronization code . By such modification it not only removes the bug but also assures the i-dentifying′s speediness . As a result of the test after the modification,the new design has been approved to be cor-rect and effective .关键词
FM遥测解调/极性反转/帧极性检测标识/锁定容错Key words
FM telemetry demodulation/polarity reversion/frame synchronization identifying code/locked error tolerance分类
信息技术与安全科学引用本文复制引用
刘洋,赵文华,何晶,邹春华,王喜权..FM遥测解调自动极性纠反功能的改进设计[J].电讯技术,2013,(9):1234-1237,4.
