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Acta Aeronautica et Astronautica Sinica ›› 2026, Vol. 47 ›› Issue (12): 332839.doi: 10.7527/S1000-6893.2026.32839

• Electronics and Electrical Engineering and Control • Previous Articles    

Long-time coherent integration acquisition technique for weak DS/FH TTC signals of spacecraft

Tian YUAN1,2, Lihua NI2, Tian LIU2(), Wei XIE2, Mou WANG3, Yan ZHANG1   

  1. 1.State Key Laboratory of ISN,Xidian University,Xi’an 710071,China
    2.Southwest China Institute of Electronic Technology,Chengdu 610036,China
    3.School of Information and Communication Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China
  • Received:2025-09-28 Revised:2025-10-27 Accepted:2025-12-02 Online:2025-12-29 Published:2025-12-29
  • Contact: Tian LIU E-mail:liutian139@139.com
  • Supported by:
    Sichuan Provincial Major Science and Technology Special Project(2024ZDZX0041);Chengdu Science and Technology Program under “Open Competition Mechanism”(2024-JB00-00014-GX)

Abstract:

To address the problem that chip range walk exceeds half a chip period due to large Doppler shifts and long-time integration in high-dynamic scenarios, which degrades coherent integration gain and detection performance, this paper proposes a long-time coherent integration acquisition technology for weak DS/FH (Direct Sequence/Frequency Hopping) TTC (Telemetry, Tracking, and Command) signals of spacecraft. Based on the traditional half-chip sliding cross-correlation matrix, a sliding-window matrix to be corrected is constructed first. Then, an extraction matrix is designed using 0/1 logic operations, and the sliding cross-correlation correction matrix is obtained by extracting from the sliding-window matrix to be corrected. Subsequently, chip range walk correction is completed by combining fractional delay compensation. Notably, the proposed technology maintains a computational complexity comparable to that of existing fast coherent integration acquisition technologies, while significantly improving frequency hopping coherent integration gain and detection performance. Verified by comprehensive simulation analyses under various conditions, the proposed method can effectively resolve the bottlenecks of coherent integration gain and detection performance in high-dynamic, large Doppler, and long-time integration scenarios. It not only provides a reliable technical solution for capturing weak DS/FH TTC signals but also offers important theoretical guidance and practical value for the engineering implementation of related spacecraft telemetry and tracking systems.

Key words: DS/FH TTC signals, sliding cross-correlation matrix extraction, range walk correction, coherent integration acquisition, Doppler effect

CLC Number: