Phase shift detection for use in laser radar ranging systems
US5164733A · kind A · utility
16Cited by
11References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1992 |
| Grant date | Nov 17, 1992 |
| Priority date | — |
| Expiry date | Jan 29, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S17/36
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A laser beam is frequency shifted for use in a laser radar ranging system driving a single optical modulator with multiple drivers to produce several frequency shifted drive frequencies. The shifted beam is transmitted to and from a target via an afocal lens. The return reflected beam, which includes phase shifted information is mixed in a detector with the local oscillator frequency to remove the local oscillator frequency. The electrical output from the detector is filtered by bandpass filters and phase detected in a signal processor to obtain range information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.