Earth-penetrating synthetic image radar
US5339080A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 1993 |
| Grant date | Aug 16, 1994 |
| Priority date | — |
| Expiry date | Apr 8, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/885
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An earth-penetrating synthetic image radar system includes a frequency generator, a transmitter, a microprocessor-based timing and frequency controller, a reference receiver, a parallel polarized receiver, an orthogonal polarized receiver, a digitizer, a calibration processor, a position measurement reference, and an image processor. A plurality of frequency synthesizers are utilized within a single frequency generator to transmit a fast-stepped synthetic image containing a series of discrete frequencies. A switch is used to select between the outputs of the synthezisers for control of the transmitter's frequency output. With a first synthesizer of a frequency f.sub.1 selected, a second synthesizer is being directed digitally to change to the next step in the frequency stepping sequence, frequency f.sub.2. The synthesizers are switched into use by the frequency generator in a ping-pong manner; the first synthesizer handling all the odd-number frequencies, the second handling all even-number frequency selections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.