Mobile terminal tracing-positioning system based on hand-held relay and positioning method

Abstract

One position measurement unit, 3-4 pieces of hand held repeater and one control center are configured in a cellular network. The method includes three phases: using initial information of position measurement unit and CDMA base station can determine range of initial position of mobile terminal; receiving and distinguishing information of mobile terminal from the mobile terminal and from hand held repeaters, the position measurement unit can construct hyperbola with hand held repeater as focus point; when data forwarded by three or more pieces of hand held repeater are detected, multiple lines of hyperbola can be constructed; point of intersection between lines of hyperbola is better accurate geographic position of the mobile terminal; based on intensities of signal forwarded by hand held repeaters, the control center makes hand held repeaters to approach target in order to obtain more accurate positioning value. Features are: high actual effect, convenient, and accuracy.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to the tracking and positioning technology of a mobile communication terminal. Background technique [0002] At present, the public security, national security, armed police forces, fire protection, and municipal emergency departments have urgent needs for the use of mobile phone positioning systems. Taking the public security department as an example, there are more than 100,000 cases of using mobile phones to engage in criminal activities every year, and the number continues to rise. Local public security and other relevant law enforcement departments urgently need a set of fixed and mobile combined, real-time and mobile mobile positioning system for CDMA mobile phones in a small special area (a set of mobile mobile positioning system includes a vehicle positioning device and multiple portable positioning device), more effectively use technical reconnaissance methods to combat...

AI Technical Summary

Problems solved by technology

In the actual use environment, for the vehicle-mounted TDOA positioning technology, more than three position measurement units need to be arranged, which makes the position measurement unit deployment time too long, and the deployment of too many position measurement units requires a large investment; the vehicle-mounted TDOA positioning technology The position measurement unit is required to provide high timing accuracy (within 20ns), which makes the timing and cold start time of the system too long, which affects the timeliness of the system; the vehicle TDOA positioning technology is greatly affected by the environment, and its flexibility is limited. Base stations cannot be deployed in dense places or places where vehicles cannot pass

AOA and AOA / TOA positioning technologies based on smart antennas require two or more vehicle-mounted base stations. When a single vehicle-mounted base station is used, the positioning error of the system is very large because the TOA accuracy is limited by the error of the mobile phone terminal; at the same time, the system’s Flexibility is very limited

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