GPS indoor positioning system and indoor positioning method based on GPS indoor positioning system

Abstract

The invention discloses a GPS indoor positioning system and an indoor positioning method based on the GPS indoor positioning system. The system comprises an outdoor GPS receiver (1), a GPS signal modulation and demodulation device (2), wireless communication devices (5), multiple antenna devices (3) and a mobile terminal (5), wherein the outdoor GPS receiver (1) receives an outdoor GPS signal, and measures the outdoor pseudo-range observed quantity d and satellite position data S; the GPS signal modulation and demodulation device (2) modulates and demodulates the GPS signal to obtain GPS radio frequency signals; the antenna devices (3) receives and forwards the corresponding GPS radio frequency signals respectively; and the mobile terminal (5) receives the GPS radio frequency signals to measure the indoor pseudo-range observed quantity D, receives the outdoor pseudo-range observed quantity d, the satellite position data S and position data K of the antenna devices (3), and calculates positioning data by combining the indoor pseudo-range observed quantity D to realize indoor positioning.

Description

technical field [0001] The present invention relates to the technical field of positioning, and more specifically, to a GPS indoor positioning system and an indoor positioning method based on the GPS indoor positioning system. Background technique [0002] At present, GPS indoor positioning technology mainly includes the following three technical solutions. 1. GPS signal forwarding scheme. The technical solution is to receive GPS signals through an outdoor GPS module, and directly forward the received GPS signals to an indoor GPS module, so as to obtain positioning data through the indoor GPS module. The defect of the above GPS signal forwarding scheme is that: the positioning data calculated by the indoor GPS module through the forwarded GPS signal is the same as the position data of the outdoor GPS module, the positioning accuracy of this scheme is poor, and it cannot meet the high positioning accuracy requirements of users. 2. A technical solution for applying a high-se...

AI Technical Summary

Problems solved by technology

The defect of the above-mentioned GPS signal forwarding scheme is that the positioning data calculated by the GPS signal forwarded by the indoor GPS module is the same as the position data of the outdoor GPS module. The positioning accuracy of this scheme is poor and cannot meet the user's high positioning accuracy requirements

The defect of this scheme is: because the GPS signal received by the high-sensitivity GPS module is a GPS reflection signal with a low signal-to-noise ratio, the positioning accuracy of the high-sensitivity GPS module is far lower than that of the outdoor GPS module, which cannot meet the high positioning requirements of users. The need for precision

The disadvantages of this scheme are: all pseudolite signal sources must maintain high-precision time synchronization; some GPS modules cannot receive radio signals emitted by pseudolite signal sources; this scheme is not suitable for mobile phones

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