Ranging system having reduced recognition jitter
US4401987A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 3, 1979 |
| Grant date | Aug 30, 1983 |
| Priority date | — |
| Expiry date | Apr 3, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/536
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A ranging system employing a limiting constant false alarm rate (CFAR) receiver having reduced recognition time uncertainty, or recognition jitter. The jitter is made proportional to signal-to-noise ratio by providing the receiver with a two-part signal. A conditioning signal is provided to the receiver prior to the time the receiver is expected to sense and respond to a recognition signal for ranging. The conditioning signal has selected strength and duration sufficient to suppress noise to a desired extent in the receiver at the time the recognition signal is received. The combination of strength and frequency of the conditioning signal is selected so as to limit the probability of a false alarm, or undesired recognition of the conditioning signal in the receiver. Receiver modification is not required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.