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Passive moving object detection system and metho using signals transmitted by mobile telephone station

A target detection and mobile phone technology, applied in the field of target detection systems, can solve problems such as weak signal power

Inactive Publication Date: 2004-10-13
ROKE MANOR RES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although they use high powered transmitters, the detected target is usually far away and the received signal power will be very weak

Method used

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  • Passive moving object detection system and metho using signals transmitted by mobile telephone station
  • Passive moving object detection system and metho using signals transmitted by mobile telephone station
  • Passive moving object detection system and metho using signals transmitted by mobile telephone station

Examples

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Embodiment Construction

[0014] figure 1 A plan view showing how a prior art system for detecting objects operates, in this example using a television transmitter. The television transmitter 20 transmits a signal which travels a distance R 1 , and is reflected by target 21. The reflected signal travels a distance R 2 , is received by the receiver 22. catch

[0015] P R = P T G 1 G 2 σ ( 4 π ) 3 R 1 2 R 2 2 λ 2

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Abstract

A passive object detection system ( 1 ) comprises first and second antennas ( 4, 6 ) and a processor ( 8 ). The first antenna ( 4 ) is adapted to receive a signal transmitted by a mobile telephone base station; the second antenna ( 6 ) is adapted to receive the signal transmitted by a mobile telephone base station ( 2 ) after it has been reflected off an object ( 3 ) and the processor compares the signal received from the mobile telephone base station with the signal reflected from the object to derive speed or position information relating to the object therefrom.

Description

technical field [0001] The invention relates to a target detection system and method, especially for detecting moving targets. Background technique [0002] In many cases, it is desirable to detect moving objects and provide position and / or velocity information of those objects, for example to detect aircraft, monitor traffic flow, or detect speeding vehicles. Active radar systems are often used to achieve these goals, but this requires radio frequency (RF) transmissions. Utilizing RF transmission has some disadvantages. This emission can be detected by a simple receiver, thereby revealing the presence of a detector (eg, an on-board radar detector used by a speeding driver). In addition, there are a number of legal restrictions on radio frequency emissions that may vary from country to country, so a system that is suitable for use in one country may be illegal in another. [0003] A passive system using a TV transmitter has been suggested, but this has certain disadvantag...

Claims

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Application Information

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IPC IPC(8): G01S13/46G01S13/00G01S13/58G01S13/92H04W24/08H04W64/00
CPCG01S13/92G01S13/583G01S13/003G01S13/02
Inventor P·G·罗伊德G·L·哈里斯B·P·斯托塔德
Owner ROKE MANOR RES LTD