Radar transmit bandwidth augmentation
| DWPI Title: Radar system e.g. synthetic aperture radar system, for e.g. airborne vehicle, has mixer adapted to mix analog intermediate frequency signal with local oscillator signal from local oscillator to form analog radio frequency signal |
| Abstract: Various technologies pertaining to forming a very high instantaneous bandwidth (IBW) radar signal based upon several radio frequency (RF) signals that have sub-bands of the frequency band of the radar signal are described herein. A radar system is configured to address local oscillator leakage across multiple transmit channels of the radar system, such that the radar signal has a relatively constant or other desired amplitude and phase across frequencies of the radar signal. In addition, the radar system is configured to compute a correction signal that pre-distorts each of the sub-frequency channels such that upon combining enables the generation of desired amplitude and phase response across a transmitted pulse. |
| Use: Radar system e.g. synthetic aperture radar (SAR) system, for an airborne vehicle and an aerial vehicle in imaging, weather, and autonomous vehicle (AV) navigation applications. |
| Advantage: The system can generate data with higher range resolution, and can generate a high-resolved high-IBW radar signals. The LO leakage of the system is minimized |
| Novelty: The system (100) has a first transmit channel (102) comprising a first local oscillator (LO) adapted to generate a first LO signal at a first LO frequency. A first mixer is adapted to mix a first analog intermediate frequency (IF) signal with the first LO signal from the first LO to form a first analog radio frequency (RF) signal. The first analog RF signal has a first frequency band below the first LO frequency to form a second analog RF signal. The second analog RF signal has a second frequency band above the first LO frequency, and outputs the first and second analog RF signals. A second transmit channel (104) comprises a second LO adapted to generate a second LO signal at a second LO frequency. A second mixer is adapted to mix a second analog IF signal with the second LO signal from the second LO to form a third analog RF signal. The third analog RF signal has a third frequency band below the second LO frequency to form a fourth analog RF signal. |
| Filed: 7/2/2024 |
| Application Number: US18761383A |
| Tech ID: SD 15166.2 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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