Double-sideband suppressed-carrier radar to null near-field reflections from a first interface between media layers
US7656342B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 2007 |
| Grant date | Feb 2, 2010 |
| Priority date | — |
| Expiry date | Oct 23, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/885
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A ground-penetrating radar comprises a software-definable transmitter for launching pairs of widely separated and coherent continuous waves. Each pair is separated by a constant or variable different amount double-sideband suppressed carrier modulation such as 10 MHz, 20 MHz, and 30 MHz Processing suppresses the larger first interface reflection and emphasizes the smaller second, third, etc. reflections. Processing determines the electrical parameter of the natural medium adjacent to the antenna.The modulation process may be the variable or constant frequency difference between pairs of frequencies. If a variable frequency is used in modulation, pairs of tunable resonant microstrip patch antennas (resonant microstrip patch antenna) can be used in the antenna design. If a constant frequency difference is used in the software-defined transceiver, a wide-bandwidth antenna design is used featuring a swept or stepped-frequency continuous-wave (SFCW) radar design.The received modulation signal has a phase range that starts at 0-degrees at the transmitter antenna, which is near the first interface surface. After coherent demodulation, the first reflection is suppressed. The pair of antenn…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.