Automatic calibration system for distance measurement receivers
US4590477A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1983 |
| Grant date | May 20, 1986 |
| Priority date | — |
| Expiry date | Mar 7, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/785
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A receiver time delay calibration device designed for low cost retrofitting of airborne equipment and more specifically DME equipment. In this system, the output of a VFO is applied to the RF input port of the receiver to be tested. The VFO is swept through a frequency range of the receiver until the receiver provides an output, which occurs at the operating frequency of the receiver, f.sub.t. The receiver's output at f.sub.t is used to stop the sweep of the VFO and maintain it at f.sub.t. The output of the VFO is then pulse modulated and the delay between the RF pulse applied to the input of the receiver and the corresponding video output pulse from the receiver is measured to determine the receiver delay time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.