Frame synchronization for pulsed jammed satellite telecommand links,International Journal of Satellite Communications and Networking

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Frame synchronization for pulsed jammed satellite telecommand links
International Journal of Satellite Communications and Networking ( IF 0.9 ) Pub Date : 2019-04-21 , DOI: 10.1002/sat.1305
Nele Noels ₁ , Marc Moeneclaey ₁

Affiliation

A new issue of the satellite telecommand synchronization and channel coding sublayer protocol includes LDPC‐coded communication link transmission units (CLTUs) that contain a 64‐bit start sequence. The novel data structures allow operation at lower signal‐to‐noise ratios than before and offer improved protection against jamming attacks. This paper considers the corresponding CLTU frame synchronization process. We derive practical algorithms to locate the start sequence in the presence of high noise levels and pulsed jamming. The different algorithms are compared in terms of implementation complexity and performance under various jamming conditions. It is shown that among the considered frame synchronizers, those involving a full search over the entire observation window provide the desired accuracy, ie, they guarantee a frame synchronization error probability that is significantly smaller than the codeword error rate, for codeword error rates near a target value of 10⁻⁴. Among these synchronizers, the full‐search hard‐decision–directed correlation‐based algorithm has the lowest complexity.

中文翻译：

脉冲干扰卫星遥控命令链路的帧同步

卫星电信命令同步和信道编码子层协议的新发行版包括包含64位起始序列的LDPC编码的通信链路传输单元（CLTU）。新颖的数据结构允许以比以前更低的信噪比进行操作，并提供更好的抗干扰攻击保护。本文考虑了相应的CLTU帧同步过程。我们推导了实用算法来在存在高噪声水平和脉冲干扰的情况下定位启动序列。比较了各种算法在各种干扰条件下的实现复杂性和性能。结果表明，在所考虑的帧同步器中，涉及在整个观察窗口内进行全面搜索的帧同步器提供了所需的精度，即⁻⁴。在这些同步器中，全搜索硬决策导向的基于相关性的算法具有最低的复杂度。

更新日期：2019-04-21

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