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A Study on Baseband Signal Processings in On-Board Processing Satellite Systems

星载处理卫星系统中基带信号处理的研究

基本信息

批准号：
61550237
负责人：
TANAKA Masatomo
金额：
$ 1.09万
依托单位：
University of Electro-Communications
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

This work was carried out in order to develop baseband signal processing methods and new functions in on-board processing satellite systems. The summary of the obtained results are shown as follows.1. Maximum likelihood decoding with interference canceling The signal processing of MSE and Viterbi decoding was introduced on board the satellite. The error rate was dervied to demonstrate the performance improvements of the processing. We noted that the improvements became large as the interference level.2. Inter-Satellite optical communications(1) In a inter-satellite optical communications, the dominant factor of performance degradation comes from the background optical noise from the sun. It is inevitable to use the coding technique to combat the factor. We derived the error rate of OOK systems using convolutional coding / soft decision Viterbi decoding, and showed the significant coding gain.(2) For the purpose of suppressing the timing jitter effects due to the satellite motions, we used the optical PPM and separate coding. Three different receiver structures were proposed. Form the analytical results, we noted that, the receiver of soft decision - sum was best of three and suppressed the timing jitter effects.(3) The combined PPM and convolutional coding scheme was introduced to overcome the effects of pulse stretching due to the earth-satellite optical communications. The numerical results of the error rate showed that, the scheme was very effective for the pulse stretching.

开展这项工作是为了开发基带信号处理方法和星上处理卫星系统的新功能。所得结果总结如下：1.最大似然干扰抵消译码星上采用了MSE和Viterbi译码的信号处理方法。错误率被导出以证明处理的性能改进。我们注意到，随着干扰水平的提高，改善变得很大。（1）在星间光通信中，来自太阳的背景光噪声是影响性能下降的主要因素。利用编码技术来对抗这种因素是不可避免的。我们推导了采用卷积编码/软判决Viterbi译码的OOK系统的误码率，并给出了显著的编码增益。(2)为了抑制卫星运动引起的定时抖动效应，我们采用了光学PPM和单独编码。提出了三种不同的接收器结构。从分析结果中我们注意到，软判决和的接收机是三个最好的，并且抑制了定时抖动的影响。(3)为了克服地-星光通信中脉冲展宽的影响，提出了PPM和卷积码相结合的编码方案。误差率的数值结果表明，该方案对脉冲展宽是非常有效的。