Passive-type range determining system using scanning receiving devices
US4339755A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1980 |
| Grant date | Jul 13, 1982 |
| Priority date | — |
| Expiry date | Mar 3, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S11/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A pair of scanning, directional receiving antennas mounted in spaced relation on a monitoring aircraft are synchronously driven at a given scan rate .omega..sub.s and at the same phase angle with respect to the broadside of the antenna pair so that the receiving beams of the antennas are always parallel. A non-scanning source of RF radiation, located at an unknown range from the monitoring aircraft, emits radiation that is received by the scanning antennas at a slight time differential t.sub.21. The received source radiation is converted by separate receiving channels into early and late arriving signals, from which a time interval signal representing t.sub.21 is produced. Concurrently therewith, an angle of arrival .phi. of the source radiation is detected and a signal representative thereof is produced. Also, signals are generated that represent the scan rate .omega..sub.s of the receiving antennas and a distance d equal to the separation between the antennas. From these signals, a range signal R is produced that corresponds to the distance between the monitoring aircraft and the source of RF radiation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.