| GNSS导航信号的开环补偿多径抑制方法 |
| |
| 引用本文： | 高科.GNSS导航信号的开环补偿多径抑制方法[J].全球定位系统,2018,43(4):81-84. |
| |
| 作者姓名： | 高科 |
| |
| 作者单位： | 中国西南电子技术研究所,四川 成都 610036 |
| |
| 摘 要： | 多径的存在会给全球导航卫星系统的接收机带来较大的定位误差。因此,高精度的接收机须对多径信号进行抑制。针对目前常用的多径抑制方法的优缺点,提出了一种基于多门延迟和曲线拟合的多径抑制方法。该方法通过多门延迟来重塑伪码的自相关函数,用于找到直射信号的伪码真实位置和接收机码跟踪环路鉴别结果之间的偏差,进一步通过曲线拟合方法更加精确地计算出该偏差,最后将该偏差通过开环方法补偿给伪距计算,使得接收机在不改变环路跟踪性能和抗动态干扰性能的前提下实现定位性能的提升。仿真结果表明新算法在前端带宽的影响下对短、中长多径均能进行有效地抑制。
|
| 关 键 词： | 多径抑制 多门延迟 曲线拟合 开环补偿 |
An Open Loop Multipath Correction Method for GNSS Navigation Signal |
| |
| Affiliation: | Southwest China Institute of Electronic Technology, Chengdu 610036, China |
| |
| Abstract: | Multipath signal can bring orientation error to GNSS receiver, so it is necessary to mitigate multipath for high precision receiver. Aiming at the advantages and disadvantages of commonly used multipath suppression methods at present, a new method is proposed in this paper. The auto correlation function of range code is remolded through multiple gate delay for finding the code loop tracking bias caused by multipath signal, and this bias is amended by parabola fit method. The amended bias is used to correct the range between satellite and receiver through open loop method. This multipath mitigation method can optimize the position accuracy with code loop tracking performance and anti dynamic performance not changed. Numerical simulations have demonstrated the effectiveness of the approach proposed. |
| |
| Keywords: | |
|
| 点击此处可从《全球定位系统》浏览原始摘要信息 |
|
点击此处可从《全球定位系统》下载全文 |
|
