摘要
The navigation and velocity measurement methods using GPS (global positioning system) signals based on a side-mounted single patch antenna are key technologies of the trajectory correction projectile. However, when the single patch antenna on the projectile receives the GPS signals at a high spin rate, there are effects such as the periodic Doppler shift induced by the rotation and crystal oscillator frequency offset, and periodic blockage that interferes with the measurement of the projectile’s velocity. By analyzing the characteristics of the Doppler frequency of carrier and pseudorange rate, we propose a velocity measurement method using pseudorange rate to separate crystal oscillator frequency offset-induced Doppler shift and estimate the velocity for high-spinning projectiles by optimization. This method eliminates hazardous frequency induced by rotation and facilitates precise velocity measurement. The method has been verified through testbed experiments. The experimental results show that after eliminating hazardous Doppler frequency under high spin rate conditions, the root mean square error (RMSE) of velocity measurement was 0.42 m/s, which meets the requirements for velocity measurement in trajectory correction projectiles.
源语言 | 英语 |
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文章编号 | 59 |
期刊 | GPS Solutions |
卷 | 28 |
期 | 2 |
DOI | |
出版状态 | 已出版 - 4月 2024 |