基于机群编队的无基准站伪距差分GPS相对导航

Pseudorange differential GPS relative navigation without base-station for formation flight

差分GPS相对导航技术越来越受到人们的关注。为了提高机群编队成员间相对定位的精度,将伪距差分GPS相对导航技术应用于机群编队飞行中,在考虑了星历误差、对流层误差、电离层误差等空间相关性误差差分残差的基础上,建立了无基准站伪距差分相对导航的线性化模型。新的模型不仅提高了精度,也简化了系统设备与理论算法的复杂程度。同时,研究验证了各偏差对系统定位精度的影响,并将编队中长机自身的定位误差加以分析,给出对于长机定位误差的补偿办法,提高了方法的实用性。仿真结果表明,与传统的单点定位相比,无基准站伪距差分线性化模型的定位精度提高了50%以上,此外,长机定位误差对于编队整体定位结果具有明显的方向性。

Differential GPS navigation technology has attracted more and more attention. In order to improve the accuracy of relative positioning between airplanes in formation flight, a pseudorange differential GPS relative navigation technology was applied in formation flight. By taking into account the residual error of satellite ephemeris error, ionosphere error and troposphere error, a linear model without base-station was established, whose aim is to simplify the system equipment and reduce the algorithm complexity. Moreover, the influence of above errors on the positioning precision of the system was demonstrated. Afterwards, the positioning deviation of lead plane was taken into consideration, in which a simulation was carried out for actual flight, and a compensation method was given to improve the practicality of the method. The simulation show that the new model's accuracy can be improved by over 50% compared with that of point positioning, and the positioning results of the lead plane's errors on the whole system has a strong orientation.