System and method for calibrating a signal detection threshold circuit
US6304828A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1999 |
| Grant date | Oct 16, 2001 |
| Priority date | — |
| Expiry date | Apr 2, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/292
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The system and method for calibrating a signal detection threshold circuit is used in a radio frequency (RF) receiver, such as a in an early warning radar (EWR) system, in which a signal detection threshold circuit rejects signals below a predetermined threshold setting and prevents noise signals from causing false alarms. The system and method include setting an initial threshold setting and receiving noise signals in one or more channels. A threshold comparison circuit rejects noise signals below the threshold setting, and a pulse repetition frequency (PRF) detection circuit detects noise pulses above the threshold setting and determines the PRF. An automatic threshold determiner and setter determines whether the PRF has reached a predetermined frequency (e.g., 400 kHz) and lowers the threshold setting until the predetermined frequency is reached. When the predetermined frequency is reached the threshold setting is stored as a noise measurement. The process is repeated until a plurality of noise measurements are made in each signal channel, and the average value of the noise measurements are used to determine the calibrated threshold setting. A calibration indicator provides an i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.