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首页> 外文期刊>Journal of Aeronautics, Astronautics and Aviation, A >PERFORMANCE ANALYSIS OF GNSS VECTOR TRACKING LOOP BASED GNSS/CSAC INTEGRATED NAVIGATION SYSTEM
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PERFORMANCE ANALYSIS OF GNSS VECTOR TRACKING LOOP BASED GNSS/CSAC INTEGRATED NAVIGATION SYSTEM

机译：基于GNSS矢量跟踪循环的GNSS / CSAC集成导航系统的性能分析

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摘要

In the GNSS receiver, the position and velocity values are determined by the pseudo-range and pseudo-range rates respectively. For the vector tracking loop, the navigation filter estimates the navigation solutions using the measurements from the frequency discriminators and the code phase discriminators. The estimation of clock bias and clock drift are the key elements which make great impact on the performance of the vector tracking loops including the tracking and the navigation solutions. With the development of the micro-electromechanical system (MEMS) technology, the chip scale atomic clock (CSAC) is gradually cheap, small and its performance constantly improved. It becomes possible for the employment of CSAC in the receiver. In this paper, the performance of the CSAC based vector tracking is analyzed and evaluated. In the semi-physical simulation system, the CSAC is employed as the time reference as the immediate frequency data collecting equipment. An experiment was conducted and the results were presented by the comparison of the values of the dilution of position (DOP) and the accuracy of the navigation solutions. The results show the mean value of the PDOPs decease by 24.6%, 27.8%, 12.1% and 21.4% respectively (PDOP, HDOP, VDOP and TDOP) compared with the cheap oscillator based vector tracking loop.
机译：在GNSS接收器中，位置和速度值分别由伪范围和伪速率率决定。对于向量跟踪环路，导航滤波器使用来自频率鉴别器和码相鉴别器的测量值来估计导航解决方案。时钟偏置和时钟漂移的估计是对包括跟踪和导航解决方案的矢量跟踪环路的性能产生重大影响的关键元件。随着微机电系统（MEMS）技术的发展，芯片尺寸原子钟（CSAC）逐渐便宜，小，其性能不断提高。可以在接收器中使用CSAC。本文分析和评估了基于CSAC的矢量跟踪的性能。在半物理仿真系统中，CSAC被用作作为立即频率数据收集设备的时间参考。进行了实验，并通过比较位置（DOP）的稀释值和导航解决方案的准确性的比较来提出结果。结果表明，与廉价振荡器的载体跟踪环相比，PDOPS Deadease的平均值分别为24.6％，27.8％，12.1％和21.4％（PDOP，HDOP，VDOP和TDOP）。

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