USRP based X-band Digital Beam Forming Synthetic Aperture Imaging Radar
summary
A USRP B200 with a commercial up/down‑converter and an FPGA timing board implements X‑band DBF SAR that transmits LFM pulses via 2 TX and 8 RX time‑multiplexed MIMO to form 16 virtual elements, achieves 44.8 MHz IBW and about 1.17° angular resolution across ±8.75°, and images corner reflectors at ~40 ft after bore‑sight calibration. FMCW and range‑domain filtering remove strong transmit leakage; USB streaming limits force packetized 16‑pulse dwells and an empirically tuned 1PPS/launch delay.
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chapters (15)
- 0:00USRP X-band SAR project intro
- 1:35Project goals and system concept
- 5:02Hardware and system architecture
- 10:39Antenna array design
- 12:05Electronics and FPGA integration
- 14:13Waveform and USRP config
- 16:39Timing and coherent dwell
- 17:44Transmit leakage evaluation
- 19:08Experimental setup with reflectors
- 20:32Signal processing and calibration
- 21:56Range and AoA analysis
- 23:42Phase calibration for beamforming
- 25:08Spatial beamforming results
- 26:50Experimental findings and limits
- 27:52Lessons and future work
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