Wireless ranging method based on CSS (chirp spread spectrum sequence) technology and CSS wireless terminal

A wireless terminal and wireless ranging technology, which is used in radio wave measurement systems, radio wave reflection/re-radiation, measurement devices, etc., can solve problems such as high hardware requirements, low positioning accuracy, and inapplicability, and achieve good development. Foreground effect

Active Publication Date: 2014-12-10
SICHUAN JIUZHOU ELECTRIC GROUP
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Problems solved by technology

The distance-based positioning algorithm includes TOA, TDOA, AOA, RSSI, etc. The ranging algorithm of RSSI is judged according to the strength of the received signal, and the positioning accuracy is not high; the ranging algorithm of AOA requires special hardware support, which is not applicable For train collision avoidance; TDOA ranging algorithm has high ranging accuracy, but requires precise time synchronization between nodes, which requires high hardware requirements; TOA ranging algorithm is simple to implement and has high positioning accuracy

Method used

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  • Wireless ranging method based on CSS (chirp spread spectrum sequence) technology and CSS wireless terminal
  • Wireless ranging method based on CSS (chirp spread spectrum sequence) technology and CSS wireless terminal
  • Wireless ranging method based on CSS (chirp spread spectrum sequence) technology and CSS wireless terminal

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Embodiment Construction

[0043] The design concept of the present invention is: based on narrow pulse spread spectrum sequence (CSS) ranging technology, using narrow pulse spread spectrum sequence with strong anti-interference ability, only simple hardware clock synchronization is required, and the transceiver end is based on symmetrical double-sided two-way measurement. With the distance algorithm, the ranging accuracy can be improved to within 1 meter.

[0044] The following first introduces the principle of CSS spread spectrum technology.

[0045] Using chirp spread spectrum technology as its physical layer transmission means can effectively meet the requirements of low power consumption and low complexity. The mathematical expression of a standard chirp signal is:

[0046] (1)

[0047] if , it means that the frequency of the chirp signal increases with the continuation of time, that is, up-chirp, conversely, if , which means that the frequency of the chirp signal decreases with...

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Abstract

The invention discloses a wireless ranging method based on the CSS (chirp spread spectrum sequence) technology and a CSS wireless terminal. According to the design, on the basis of the CSS technology, the chirp spread spectrum sequence with the strong anti-jamming capability is adopted, the transmitter and receiver end is based on the symmetrical-face two-way ranging algorithm, the digital matched filter design technology is adopted in a matched manner, and the ranging accuracy can be improved by being smaller than 1 meter.

Description

technical field [0001] The invention relates to the technical field of train collision avoidance, in particular to a CSS-based wireless ranging method and a CSS wireless terminal. Background technique [0002] In recent years, my country's railway transportation has developed rapidly, especially bullet trains and high-speed trains have taken the lead in the world. However, with the expansion and criss-crossing of the railway network, the smaller and smaller intervals between trains and the increasing speed of trains, the safety of rail transit is facing huge challenges. The "7.23" and "9.27" accidents have shown that the current The train lacks perfect, continuous and real-time monitoring means during its operation, and lacks more reliable measures for monitoring the front and rear vehicles. Therefore, it is necessary to equip an independent system to monitor the position between trains and provide early warning to the driver, which makes the train anti-collision equipment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S11/08G08G1/16
CPCG01S11/08G01S13/93G01S2013/9328G01S7/2886
Inventor 杨伟军王杰
Owner SICHUAN JIUZHOU ELECTRIC GROUP
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