GNSS接收机卫星位置计算的插值算法
首发时间:2012-06-28
摘要:如今嵌入式产品的低功耗,小型化和高性能的发展需求对导航接收机的算法提出了更高的要求。采用直接法计算卫星PVT会占用大量的内存和CPU处理时间。本文根据GPS定位中卫星位置速度和钟差随时间的连续性的特点和对拉格朗日插值算法的研究,提出了在嵌入式系统中对卫星PVT计算运用拉格朗日插值算法的具体步骤和流程。通过数值分析表明,在卫星PVT计算中采用9阶拉格朗日插值算法能获得较好的精度并大大提高运算速度,从而减少嵌入式CPU的负载。
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The interpolation algorithm of satellite positioning in GNSS receiver
Abstract:The developing inquiries, like Low Power Consumption, miniaturization and high-performance, of embedded system have put higher standards for receiver navigation algorithm. Using ephemeris to directly calculate satellite position, velocity and clock bias occupies a lot of memories and processing time of CPU. This paper is based on the continuity of satellite position, velocity and clock bias in moving condition and the analysis of Lagrange algorithm, putting forward the interpolation algorithm in GPS satellite PVT computation as well as the exact process. Numerical analysis showed that using 9 orders Lagrange interpolation algorithm had dramatically increase the computing speed, which in return reduced the load of CPU in embedded system, and met the needs of precise location.
Keywords: GPS Location The Embedded System The Interpolation of Satellite position, velocity and Clock Bias GNSS
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