Method of, and apparatus for, determining position

A technology for determining location and equipment, applied in the field of determining location and radio systems, which can solve problems such as high power consumption, catastrophic consequences, and reduced reliability

Inactive Publication Date: 2005-07-20
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

in addition to reducing confidence in position determination systems, delays in finding targets in dangerous situations can have disastrous consequences
Multipath ...

Method used

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  • Method of, and apparatus for, determining position
  • Method of, and apparatus for, determining position
  • Method of, and apparatus for, determining position

Examples

Experimental program
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Embodiment Construction

[0015] refer to figure 1 , the positioning system comprising a plurality of equally spaced antennas A1 to AN, where N is an integer having a value of the order of twenty. The antennas A1 to AN are coupled to a position determining device 10 having an output coupled to a display device 12 . The device 10 includes a multi-channel receiver and correlator 14 having an output coupled to a demodulator 16 . The demodulated signal is applied to a processor 18 which operates according to software held in a program ROM 20 . The processor 18 is capable of performing various mathematical operations and, in particular, of performing Fourier transforms. An output of the processor 18 is coupled to a display device 12 capable of displaying the location of a transmitter 22 assumed to be carried by a young child 24 playing freely in an amusement park whose parents want to monitor the location of the child at any time. Of course, there are many other applications of the positioning system in...

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Abstract

A method of, and apparatus for, determining position, comprises a receiver ( 14 ) receiving a signal from a remote transmitter ( 22 ) whose position has to be determined. The Fourier transform of a power spectrum density of the received signal is determined and a check is made to see if a line-of-sight (LOS) signal is present. If so, a multipath mitigation technique is implemented to identify the LOS signal and once identified the position of the remote transmitter is determined by deriving the propagation time of the LOS signal. Current can be saved by inhibiting the multipath mitigation technique in the absence of detecting a LOS signal. In one embodiment the presence or absence of the LOS signal is determined by dividing the magnitude of the peak at zero frequency by the maximum magnitude of all the other peaks and if the answer is less than unity, LOS is not present.

Description

technical field [0001] The present invention relates to methods and devices for determining position. The invention has application to radio systems for locating / monitoring the position of living objects such as babies, persons working in potentially hazardous areas and pets such as dogs and cats and inanimate objects such as items in storage rooms. Background technique [0002] Basically, a position determination system consists of a transmitter carried by an object whose position is to be determined and a receiver which receives the transmitted signal and determines the position of the object. However, to accurately and reliably determine position, the receiver must be able to determine the presence of a line of sight (LOS) signal from multipath reflected signals. If the received signal is processed according to multipath mitigation techniques without first determining whether a LOS signal is present, it may occur that the calculated position is incorrect because when the...

Claims

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Application Information

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IPC IPC(8): G01S1/00G01S5/02G01S11/08
CPCG01S5/14G01S5/0215G01S11/08G01S5/0218
Inventor J·罗森菲尔德
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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