Performance analysis of LEO satellites enhanced GNSS/MIMU tight integration positioning
Aiming at the problems of severe satellite signal attenuation,high pseudorange noise and weak anti-interference capabilities in the low-cost global navigation satellite system(GNSS)built into smartphones,the paper proposed a tightly coupled navigation method using low Earth orbit(LEO)satellite constellations enhanced GNSS/miniature inertial measurement unit(MIMU):a tightly coupled navigation model was constructed by integrating GNSS satellite observation data and MIMU measurement data from the built-in devices of smartphones,and LEO satellite observation data calculated from Keplerian orbital elements;then,the performance of positioning was analyzed.Experimental result showed that the addition of LEO satellite observations would help reduce the position dilution of precision(PDOP)of GNSS by 16.63%,and the positioning accuracy in the horizontal and vertical directions of the integrated navigation system would be improved to 1.361 m and 1.418 m,respectively,indicating that the inclusion of LEO satellite could effectively enhance the positioning accuracy of GNSS/MIMU integrated navigation systems in smartphones.
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