A Metro Train Precise Positioning and Safety Navigation System Based on Ranging Mode

Abstract

The invention discloses a subway train accurate positioning and safe navigation system based on a distance measurement mode. The system comprises a first vehicle-mounted mobile distance measurement terminal, a second vehicle-mounted mobile distance measurement terminal, a first station distance measurement base station, a second station distance measurement base station, a first ground network server system and a second ground network server system. The first vehicle-mounted mobile distance measurement terminal and the second vehicle-mounted mobile distance measurement terminal are respectively arranged at the front and rear cabs of a subway train. The first station distance measurement base station and the second station distance measurement base station are respectively installed at the fixed point positions having accurate position line coordinates on the two-way rails of both sides. According to the subway train accurate positioning and safe navigation system based on the distance measurement mode, real-time accurate position information and sensor detection data can be provided to operation and tracking, navigation and positioning and intelligent scheduling of the subway train so that safe operation of the train can be effectively guaranteed, operation efficiency can be enhanced, and a new set of technical means can be provided to safe operation management of the subway train.

Description

technical field [0001] The invention relates to the technical field of positioning and navigation systems, in particular to a precise positioning and safe navigation system for subway trains based on a ranging mode. Background technique [0002] With the vigorous development of the social economy, the urban population and vehicles have increased rapidly, leading to the gradual deterioration of traffic conditions. The traditional train positioning system has experienced a development stage from relying on geographic equipment to vehicle autonomous positioning, from judging occupancy information to obtaining precise coordinate positions. A variety of technologies have been used in the train positioning process successively, including track circuits, axle speed measurement, transponders, etc. With the increasing maturity of my country's Beidou satellite technology, the positioning accuracy and reliability have been greatly improved compared with GPS. It can distinguish the spec...

AI Technical Summary

Problems solved by technology

However, in practical applications, due to the obstruction of natural or artificial buildings, the interference of reflected signals, the interference of the signal itself, the signal blocking, the attenuation caused by the antenna and the attenuation caused by the satellite signal processing equipment, when the signal is completely blocked or After the signal power attenuates below the sensitivity of the satellite receiver, the channel of the satellite receiver will not be able to track the satellite signal normally. In this case, the satellite tracking will lose lock, that is, the satellite cannot complete the positioning

The urban rail transit subway environment, since most of the sections are in the underground section, is the environment where the satellite system cannot achieve the positioning effect

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