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紧耦合导航系统中的GDOP估算方法

Keywords: 组合导航,卡尔曼滤波,几何精度因子,星座选择

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Abstract:

提出一种针对低成本GPS/SINS(globalpositioningsystem/strap-downinertialnavigationsystem)紧耦合导航系统的快速选星方法,充分利用SINS的输出估算几何精度因子(GDOP),避免大量迭代带来的时间消耗,在卫星失锁后或星座分布发生变化时实现快速选星;并在该方法的基础上设计并实现紧耦合导航系统中量测噪声方差阵的在线修正,提高了组合导航系统滤波估计的精度.试验结果表明,本文方法弥补了传统GPS/SINS紧耦合导航系统中选星时间消耗代价过大、收敛精度较低的问题,并可相应降低设备成本.

References

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