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Radar Interferometric Phase Ambiguity Resolution Using Viterbi Algorithm for High-Precision Space Target Positioning
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DOI：10.1109/LSP.2023.3313092.png)
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Abstract
En 中文
With the development of space resources, high-precision positioning is a significant way to obtain the on-orbit status information of space targets. Ground radar interferometric is an active space target positioning method, which can provide positioning information in all-weather and all-time. However, the directly measured interferometric phase will be ambiguous when the range difference between space targets and radar sites exceeds a certain boundary. In this letter, phase ambiguity resolution (AR) is established as a hidden Markov model (HMM) dynamic optimization problem in combination with the space target's movement process at different pulse times, in which no auxiliary baseline is required compared with traditional methods. And the Viterbi algorithm is used to solve the optimal ambiguous number (AN) sequence. Since the sequence decoding is mainly based on solving the optimal AN path that to explain the target position at different times best, a transmission technique of staggered carrier frequency signals is adopted, which significantly increases the robustness of phase AR. Extensive simulation experiments show that the proposal performs effectively and accurately for high-precision space target positioning.
Keywords:
Ambiguity resolution (AR)
high-precision space target positioning
radar interferometric
Viterbi algorithm
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