Research on Fuzzy Two-Dimensional Search Method of Global Navigation Satellite System Attitude Measurement

The high-precision navigation solution of global navigation satellite system (GNSS) relies on precise attitude measurement, and correctly and reliably determining the ambiguity of whole cycles is the key to achieving GNSS attitude measurement. This paper is based on the constraint condition that the baseline is short and the length is fixed during GNSS attitude measurement. By utilizing its relationship with the baseline elevation angle and heading angle, the corresponding ambiguity is obtained. Thus, the search space is reduced to two-dimensional, and a fuzzy two-dimensional search method is proposed to improve the fixation and reliability of multi baseline fuzzy search. And actual experimental results have shown that this method has small search space, short initialization time, and can enable satellite navigation to obtain high-precision attitude information.