Location system with calibration monitoring
First Claim
1. In a radio signal based object location system wherein location devices are provided on articles for use in locating said articles, and wherein a database is maintained relating characteristics of radio signal transmissions between said location devices and fixed devices to locations within an area, a method for maintaining said database to reflect propagation conditions, comprising providing location devices at fixed positions within said area, recording data representing radio signal transmission characteristics between said fixed position location devices and said fixed devices, and monitoring transmissions between said fixed position location devices and said fixed devices to determine changes in said characteristics of radio signal transmissions from said recorded data.
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Accused Products
Abstract
A radio signal based object location system is provided wherein location devices are provided on articles for use in locating the articles, and wherein a database is maintained relating characteristics of radio signal transmissions between the location devices and fixed devices to locations within an area. A method is provided for maintaining the database to reflect propagation conditions. Location devices are provided at fixed positions within the area. Data representing radio signal transmission characteristics between the fixed position location devices and fixed devices is recorded. Transmissions between the fixed position location devices and the fixed devices is monitored to determine changes in the characteristics of radio signal transmissions from the recorded data.
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Citations
9 Claims
- 1. In a radio signal based object location system wherein location devices are provided on articles for use in locating said articles, and wherein a database is maintained relating characteristics of radio signal transmissions between said location devices and fixed devices to locations within an area, a method for maintaining said database to reflect propagation conditions, comprising providing location devices at fixed positions within said area, recording data representing radio signal transmission characteristics between said fixed position location devices and said fixed devices, and monitoring transmissions between said fixed position location devices and said fixed devices to determine changes in said characteristics of radio signal transmissions from said recorded data.
Specification