Near-range microwave detection for frequency-modulation continuous-wave and stepped frequency radar systems
US6664920B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1993 |
| Grant date | Dec 16, 2003 |
| Priority date | — |
| Expiry date | Nov 18, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/931
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A cancellation technique embodied in a system and a radar signal processing method that is employed to detect near-range targets. The present invention uses a frequency-modulation continuous-wave (FMCW) or stepped frequency waveform and is capable of detecting near-range targets that would normally be obscured by transmitter leakage and internal reflections. This cancellation technique works by transmitting one or more reference ramp signals and then subtracting the coherent average of the transmitted reference ramp signals from a group of succeeding transmitted and received ramp return -signals. The resulting group of FM ramp return signals is noncoherently integrated to achieve more stable target detection statistics. More particularly, the present technique implements the following processing steps. Generating a predetermined number of reference ramp signals. Coherently averaging target return signals corresponding to transmitted reference ramp signals to produce a reference average signal. Transmitting additional ramp signals. Subtracting the reference average signal from each ramp return signal to produce a cancelled ramp signal. Fourier transforming each cancelled ramp signal…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.