System for testing performance of GPS hardware receiver based on GPS software receiver in dynamic environment

Abstract

The invention discloses a system for testing the performance of a GPS hardware receiver based on a GPS software receiver in a dynamic environment. The system provides dynamic environment parameters Din through a three-axle table, then outputs medium frequency information R(tk) after sampling the satellite information acquired by an antenna installed on the three-axle table by using a medium frequency sampler, and finally analyzes the information by the GPS software receiver, a D-PLL-P model and a D-PLL-F model, thereby reproducing the problems of lock loss and low output accuracy of the GPS hardware receiver caused in the dynamic environment; and the reproduced parameters can provide a guide for the design of the GPS hardware receiver.

Description

technical field [0001] The present invention relates to a system for testing the performance parameters of GPS receivers, more particularly, refers to a system for reproducing the performance parameters of the obtained GPS software receiver output under the dynamic environment provided by the three-axis turntable A system of GPS hardware receiver performance parameters. Background technique [0002] GPS (Global Positioning System) is a satellite-based navigation and positioning system, which is widely used in military and civilian applications. [0003] Traditional GPS receivers (also known as GPS hardware receivers) are based on dedicated hardware (ASIC), which have high sensitivity and signal processing speed, but poor flexibility and cannot be changed after finalization. [0004] The GPS software receiver uses a general-purpose processor (that is, a computer or a DSP chip or an FPGA chip or a single-chip microcomputer) to process and calculate real-time collected GPS sig...

AI Technical Summary

Problems solved by technology

[0006] At present, the methods for testing GPS performance in dynamic environments mainly include: computer-based simulation or indoor testing of signal simulators. The GPS receiver navigation data used in these two testing methods is simulated, while the actual GPS receiver The working environment is relatively complex, and some factors are not repeatable and predictable. This test method cannot fully reproduce the complex environment under real dynamic conditions.

The other is the performance test based on the dynamic detection platform. This test method is mainly aimed at the research on the accuracy of differential GPS positioning under the condition of strong signal (PDOP value less than 2.0) and low dynamic (centimeter-level, sub-meter-level dynamic). Environment tracking performance is not discussed

There is also an outdoor dynamic test based on a sports car or flight test experiment. In the flight test experiment, due to the limitation of experimental equipment, there is no way to achieve high acceleration and jerk, and the cost is very high. For high-altitude operating carriers, There is no other navigation method with higher accuracy than satellite navigation, and it is difficult to evaluate the test results of satellite navigation performance

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