Abstract: In high-dynamic scenarios with large Doppler shifts and prolonged integration time, the code range migration often exceeds half a chip period, leading to significant degradation in coherent integration gain and detection performance. To address this issue, this paper proposes a long-time coherent integration acquisition technique for weak DS/FH (Direct Sequence/Frequency Hopping) telemetry, tracking, and command (TT&C) signals of spacecraft. The method requires only an extension of the code correlation matching matrix, followed by code range migration correction based on a 0/1 logic judgment. While maintaining computational complexity comparable to existing fast coherent integration acquisition techniques, it significantly enhances the coherent integration gain and detection performance of frequency-hopping signals. Simulation results comprehensively demonstrate that the proposed approach effectively mitigates the performance degradation caused by code range migration under high dynamics and large Doppler conditions, as well as validates its implementation feasibility, thereby offering substantial theoretical and practical value for real-world engineering applications.

Key words: DS/FH TT&C signal, Matching matrix extraction, Range migration correction, Coherent integration acquisition