Pulse-hyperbolic location system using three passive beacon measurements
US4398198A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 28, 1980 |
| Grant date | Aug 9, 1983 |
| Priority date | — |
| Expiry date | Oct 28, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S5/0273
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A radar system is used to locate a vehicle's position on a predetermined X, Y grid, which could be latitude and longitude. Several paths of different lengths link the vehicle with a master station which transmits cyclically recurring pulses. Equipment on the vehicle compares the propagation time required for the pulses to travel over each of the several paths. The compared times are then used by a microprocessor to calculate the position of the vehicle. The several paths are identified by a use of repeater stations which may selectively drop predetermined ones of the cyclically recurring pulses and retransmit the rest. For example, one repeater may retransmit every second recurring pulse and another repeater may retransmit every third recurring pulse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.