Radiation source detection by recording spectral records at different times or locations and collating the spectral records
US6021269A · kind A · utility
Inventor
Key dates
| Filing date | Apr 9, 1997 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | Apr 9, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/021
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In an apparatus and method for detecting radiation transmitters (such as "bugs" or leaky data cables), spectral records are recorded at different times and/or locations. The records are displayed graphically and compared to identify transmitters. Spurious signals, for example as caused by taxi radio transmissions, can be eliminated since these will not appear in all records. A local transmitter of the type to be detected will appear in all records for a given location, but not in records for other locations. The strength of the transmitter signal varies as the reciprocal of the distance squared, and the presence of the transmitter and its position can be located by moving the recorder and detecting the rise or fall of the displayed graphical signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.