CDMA mobile target handheld detecting device and detecting method

Abstract

Technical scheme of the invention is as following: direction-finder antenna (DFA) captures signal of public channel in forward direction (FD) of service base station of CDMA mobile target; communication module (CM) constructs target reference signal based on content message body in public channel in FD; dumb call module carries out dumb calling to target terminal to be positioned; DFA captures reverse access signal (RAS); CM decodes the access signal based on constructed reference signal, and captures ID number of mobile user in message body of RAS; control process unit determines ID of mobile target (MT) to be measured, and carries out estimating positional parameter; the position calculation module computes position of target, and further accomplishes relative positioning tracking for MT to be measured. Features are: flexible and convenient, high real time and validity etc. The method is suitable for positioning operation at mountainous area and place with dense buildings.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a wireless detection and positioning system. Background technique [0002] At present, there are mainly two systems for the positioning technology in the CDMA wireless cellular communication system. One is the positioning technology based on the mobile station, which is also called the positioning technology based on the downlink; the other is the positioning technology based on the mobile network, which is also called the positioning technology based on the uplink. The positioning technology based on the mobile station requires the mobile station to participate in the measurement of the positioning parameters and the solution calculation of the measured value, so the software and hardware of the existing mobile station need to be modified and upgraded. The positioning technology based on the cellular network or the mobile station has a large change to the network...

AI Technical Summary

Problems solved by technology

In actual use, due to the need to arrange positioning base stations, the deployment time of positioning base stations is too long to reduce its practical effect; especially when using the TDOA positioning method, too many positioning base stations need to be arranged, which requires a large investment of money and a lot of manpower and physical resources; the positioning accuracy is affected by factors such as the geometric layout of the positioning base station, the geographical location of the positioning base station, and the non-horizontal plane between the positioning base stations, making the positioning accuracy low

Moreover, it is greatly affected by the environment, and the flexibility is limited. It is impossible to deploy base stations in mountainous areas and places with dense buildings or places where vehicles cannot pass.

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