Research on differential positioning technology of missile borne GNSS virtual reference station
For high-dynamic target positioning in long-baseline real-time solutions,this study utilizes network-based multi-station fusion technology,along with a combination of reference station and linear interpolation model algorithms.This generates pseudo-range observations for virtual reference stations,which are used as reference stations in pseudo-range differencing with the target.This approach is employed to compute the position trajectory of high-dynamic targets.Validation using measured data from static and high-dynamic targets indicates that,with three reference stations,the positioning accuracy for static data achieves 0.399 meters.For high-dynamic targets,with no fewer than six common-view satellites between the target and reference stations,the positioning error does not exceed 2.75 meters.When compared to the measured comprehensive trajectories from other external measurement devices such as optical radar and multi-speed radar,the root mean square of the position difference between the two methods is 6.39 meters.This largely satisfies the positioning requirements for high-dynamic targets.
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