Failure determination device of radar apparatus
US5841393A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Mar 11, 1997 |
| Grant date | Nov 24, 1998 |
| Priority date | — |
| Expiry date | Mar 11, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/931
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A high frequency signal, which is produced in a oscillator, is modulated by a frequency from a modulating signal generated by a modulation signal generator and radiated from a sending antenna. A reflected signal from a target object is received by a receiving antenna, and frequency-converted by a local oscillating signal from a directional coupler in the frequency convertor. Then, distance and speed information is detected by a signal processing unit. A modulator, which is connected to the oscillator, modulates the oscillator output in order to detect a failure. A detection unit, in which a filter unit, a rectification circuit, and a voltage comparison circuit are included, detects modulated elements originated in the above described modulator. The signal processing unit makes a failure determination based on the modulated elements which have already been detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.