INS辅助的GPS接收机跟踪环结构和性能分析

分析了GPS/INS的不同组合方式,研究了GPS接收机跟踪环的结构,给出了多普勒频移和时钟误差频率的外部估计方法,提出了一种使用低成本惯性器件信息辅助GPS接收机跟踪环的深组合(deepintegration)结构,建立了这种结构的前馈模型,并对其进行了仿真分析。仿真结果表明,这种结构可以使得接收机具有较宽的跟踪带宽和较好的抑制噪声能力,能显著提高GPS接收机的性能。

Performance and Architectures Analysis for INS-Aided GPS Tracking Loops

Global positioning system(GPS) and inertial sensors have complementary characteristics,which have been exploited in the design of integrated GPS inertial navigation systems(INS).A scheme of integration can be used,in which the inertial sensors are used to aid the GPS phase/frequency tracking loops directly.This level of coupling is referred to as ultra-tight integration.It offers potential improvements to GPS performance,such as higher phase-tracking bandwidth,and more resistance to frequency noise.We propose a simple architecture for GPS-INS with ultra-tight integration and present the analysis for the performance of such systems.It is proved that this integration scheme can reduce the carrier tracking loop-filter bandwidth for improved signal-to-noise ratio.