Abstract
When satellite navigation receivers are equipped with multiple antennas, they can deliver attitude information. In previous researches, carrier phase differencing measurement equations were built in the earth-centered, earth-fixed (ECEF) coordinate, and attitude angles could be obtained through the rotation matrix between the body frame (BF) and the local level frame (LLF). Different from the conventional methods, a hybrid algorithm is presented to resolve attitude parameters utilizing the single differencing (SD) carrier phase equations established in LLF. Assuming that the cycle integer ambiguity is known, the measurement equations have attitude analytical resolutions by using simultaneous single difference equations for two in-view satellites. In addition, the algorithm is capable of reducing the search integer space into countable 2D discrete points and the ambiguity function method (AFM) resolves the ambiguity function within the analytical solutions space. In the case of frequency division multiple access (FDMA) for the Russian Global Orbiting Navigation Satellite System (GLONASS), a receiver clock bias estimation is employed to evaluate its carrier phase. An evaluating variable and a weighted factor are introduced to assess the integer ambiguity initialization. By static and dynamic ground experiments, the results show that the proposed approach is effective, with enough accuracy and low computation. It can satisfy attitude determination in cases of GPS alone and combined with GLONASS.
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Jin, Wr., Zhai, Cr., Wang, Ld. et al. Hybrid analytical resolution approach based on ambiguity function for attitude determination. J. Zhejiang Univ. Sci. A 10, 1038–1048 (2009). https://doi.org/10.1631/jzus.A0820600
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DOI: https://doi.org/10.1631/jzus.A0820600
Key words
- Global positioning system (GPS)
- Russian Global Orbiting Navigation Satellite System (GLONASS)
- Analytical resolution
- Attitude determination
- Ambiguity function method (AFM)