A precise ranging method and device for underground coal mine spread spectrum without fine synchronization

Abstract

The invention provides a precise synchronization-unrequired coal mine underground spread spectrum accurate ranging method and a device. According to the precise synchronization-unrequired coal mine underground spread spectrum accurate ranging method, a parallel and tracking loop-free pseudo-noise code synchronization accurate measurement algorithm is adopted, such that higher time resolution can be obtained based on rough synchronization without precise synchronization process required, and therefore, ranging pseudo code speed can be decreased, and bandwidth occupied by ranging pseudo codes is limited below 100MHZ, and thus, meter-level positioning accuracy can be achieved. The device for realizing the method comprises a communication control module and a wireless response module; the communication control module, adopting a high-performance FPGA as a core processor, mainly comprises a transmitter and a receiver; and the wireless response module de-spreads received signals through adopting a search-track-free synchronization mode without a separate processor required. The precise synchronization-unrequired coal mine underground spread spectrum accurate ranging method and the device of the invention can inhibit serious electromagnetic interference under a coal mine, and are advantageous in robust hardware designs, redundant algorithms, high-accurate ranging and strong real-time property, are suitable for a coal mine underground personnel precise positioning system.

Description

technical field [0001] The invention relates to a radio ranging method and device, in particular to an underground ranging method and device based on direct sequence spread spectrum communication technology, which belongs to the technical field of radio positioning and is suitable for measuring the position information of underground coal mine workers. Background technique [0002] The coal output of underground coal mines in my country accounts for about 95%. Coal mining is mainly done manually, which has certain risks. Establishing a wireless positioning system for underground personnel suitable for the development of coal in my country is important for ensuring the personal safety of underground workers. is of great significance. Mine underground personnel positioning system generally adopts a positioning algorithm based on distance measurement, and its core technology is distance measurement technology. The accuracy of positioning depends entirely on the accuracy of dista...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of low positioning accuracy caused by serious underground electromagnetic interference, overcome the shortcoming of the inability to perform real-time ranging determined by the contradiction between the ranging accuracy and capture time of the spread spectrum ranging system, and reduce the cost of the spread spectrum ranging system Complexity, the present invention provides a method and device for accurate distance measurement in coal mines based on spread spectrum technology, according to the characteristics of its spread spectrum pseudo-random (Pseudo Noise, PN) code can be copied and its autocorrelation function is a Δ function, During the coarse synchronization process, through FPGA parallel high-speed digital integral operation, 10 points are sampled at each PN chip duration, and the described method can directly obtain higher time resolution in the coarse synchronization process without fine-tuning The synchronization link reduces the pseudo-code speed of distance measurement and the complexity of device design, and is suitable for the precise positioning system of underground personnel in coal mines

Images