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复杂信号环境下的GNSS定位星座选择算法

DOI: doi:10.3969/j.issn.1006-7043.2011.01.016

Keywords: 全球导航卫星系统, 复杂信号环境, 星座选择, 伪距测量误差, 载噪比

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Abstract:

为了有效减小全球导航卫星系统(GNSS)接收机在复杂信号环境下的定位误差,提出一种定位星座选择算法.该算法利用简化的距离残差平方和作为检验统计量,该检验统计量可以反映单颗卫星的伪距测量误差进而实时反映定位误差的变化.基于该检验统计量,提出的定位星座选择算法能够检测出多个错误观测量进而将其去除.测试表明,这种定位星座选择算法可以大幅度减小定位点的错误概率,性能优于传统GDOP(几何精度因子)定位星座选择算法;长时间连续定点定位仿真测试中平均有效性超过80%,动态测试中有效性超过70%.

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