Laser telemetry and Doppler measurement system with pulse compression
US4743110A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1984 |
| Grant date | May 10, 1988 |
| Priority date | — |
| Expiry date | Mar 26, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/50
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Laser telemetry and Doppler measurement apparatus using pulse compression has a transmitter for providing a periodic pulsed transmission laser wave having a pair of pulses, one pulse being frequency modulated on one side of a main frequency F.sub.E, and the other pulse being frequency modulated on the other side of the main frequency F.sub.E. The transmitter also provides a reference laser wave having a frequency F.sub.L. A photomixer is adapted for superheterodyne reception of the reference laser wave and a return laser signal which has been reflected from a target. The return laser signal has a Doppler shift frequency F.sub.D. The photomixer provides a beat signal having a frequency F.sub.I plus F.sub.D, where F.sub.I is an intermediate frequency. A Doppler aquisition loop transposes the beat signal frequency and provides a transposed signal to compensate for the Doppler shift. The Doppler acquisition loop provides a coarse compensation signal having a frequency near the frequency F.sub.D. Under target tracking conditions, the Doppler acquisition loop then provides an automatic fine compensation signal which compensates for the Doppler difference .DELTA.F.sub.D which exists betwe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.