Abstract
The strength of angle constraint greatly affects the performance of attitude domain search in GNSS single-frequency single-epoch attitude determination. In this paper, given a constant baseline length constraint, we make use of the integer least squares to improve the conventional search method in attitude domain. First, we use the objective function based on ILS to derive the angle-related term, which is used to compress the attitude search space. Second, the ambiguity candidates are determined through 2D search in the attitude search space. At last, a strategy that utilizes unconstrained the least-squares solution to eliminate the pseudo candidates is proposed to accelerate search speed, and the ambiguities are fixed while the objective function is minimum. As the experiments revealed, our new method overcomes two problems of conventional search method in coordinate domain: multi-peak phenomenon and long computation time, and has high success rate and high real-time performance.
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This work is supported by National Natural Science Foundation of China (Grant No. 61601506).
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Wu, H., Jiao, Y., Bao, L. (2020). Baseline-Constrained GNSS Single-Frequency Single-Epoch Attitude Determination Based on Attitude Domain Search. In: Sun, J., Yang, C., Xie, J. (eds) China Satellite Navigation Conference (CSNC) 2020 Proceedings: Volume II. CSNC 2020. Lecture Notes in Electrical Engineering, vol 651. Springer, Singapore. https://doi.org/10.1007/978-981-15-3711-0_19
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DOI: https://doi.org/10.1007/978-981-15-3711-0_19
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