System for realizing centimeter-level precision GPS positioning in ARM platform

Abstract

The invention discloses a system for realizing centimeter-level precision GPS positioning in an ARM platform. The system for realizing the centimeter-level precision GPS positioning in the ARM platform comprises a front receiving device integrated on a board card, an FPGA correlator and a micro-processor. The front receiving device is used for receiving a satellite signal through an external antenna, and is integrated with a band-pass filter, a mixer / oscillator and a three-position digital analog converter. The FPGA correlator is used for performing the further filtering and the correlation analysis to the satellite signal, and is integrated with a sample memory, a satellite signal obtaining channel, a satellite signal tracking channel and a system timer. The micro-processor is used for receiving the intermediate calculation result output by the FPGA correlator, and executing all calculations on the FPGA correlator, and outputting the real time carrier phase difference position and speed result. The system for realizing the centimeter-level precision GPS positioning in the ARM platform is capable of performing the deep optimization to the solution algorithm of the ambiguity of whole cycles so as to enable the real time positioning of the centimeter-level, effectively reducing the error caused by the carrier phase measurement, and realizing the manufacture and application of the RTK micromation and low cost device.

Description

technical field [0001] The invention relates to a positioning system, in particular to a system for realizing centimeter-level precision GPS positioning on an ARM platform. Background technique [0002] The Global Positioning System (GPS, global positioning system) is a system that uses positioning satellites to perform real-time positioning and navigation around the world. With the development of intelligent terminal equipment, GPS positioning technology is widely used in different fields. Single-point positioning, or absolute positioning, is the most commonly used method in GPS positioning technology. It determines the position of the GPS receiver on the earth through the distance between the GPS receiver and four or more known satellites. The measurement distance error between the GPS receiver and the known satellites, such as the satellite clock error and the time measurement error caused by the ionospheric delay when the satellite signal returns, is the most important ...

AI Technical Summary

Problems solved by technology

At present, limited by the algorithm efficiency of RTKLIB, the operating environment and the development level of related hardware, the current RTK computing system is huge, requiring high computing power, high power consumption, and many equipment components, making its integration level low , the portability is very poor, and the price is very high (generally starting at 40,000 yuan)

Its high equipment cost, installation cost, operation cost and maintenance cost greatly restrict the application of RTK in real life

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