Abstract
Low frequency ultrawideband (LF UWB) synthetic aperture radar (SAR) has lately become of a particular interest to SAR community. Monostatic and bistatic LF UWB SAR system has the well foliage penetrating capability, high-resolution imaging and providing the increased information. In 2015, a monostatic and bistatic LF UWB SAR imaging experiment was conducted. In this experiment, the monostatic and bistatic data were collected simultaneously by operating a moving vehicle-based radar in the SAR mode, in conjunction with a stationary ground-based receiver. The aim was to investigate the imaging property of the bistatic LF UWB SAR system. The one pulse per second (1 PPS) signal in combination with the global position system (GPS) disciplined 100 MHz oscillator from the GPS receivers was used to implement the time and frequency synchronization in this SAR system. The bistatic SAR image was obtained by the subaperture spectrum-equilibrium method integrated with the fast factorized back projection (FFBP) algorithm. Bistatic experiment results are show to prove the validity of the bistatic LF UWB SAR imaging experiment.
Highlights
The bistatic synthetic aperture radar (SAR) image was obtained by the subaperture spectrum-equilibrium method integrated with the fast factorized back projection (FFBP) algorithm
Monostatic Low frequency ultrawideband (LF UWB) SAR system was developed by the National University of Defense Technology in 2008 [16], which operated at the LF signal with the frac
It can be concluded that the proposed imaging method can satisfy the bistatic LF UWB SAR imaging in reality
Summary
Synthetic aperture radar (SAR) plays a significant role in the remote sensing ap-. H. Some countries have conducted the imaging experiment of the monostatic and bistatic LF UWB SAR, and the excellent results were obtained [18] [19] [20] [21] [22]. Compared with the monostatic LF UWB SAR system, the bistatic LF UWB SAR system poses the various challenges in the imaging experiment, such as the synchronization between the transmitter and receiver, precise position measurement of radars, polar imetric calibration, collection geometry planning, data processing, etc. This work was completed and the imaging experiment of the monostatic and bistatic LF UWB SAR was conducted in 2015, and the monostatic and bistatic data were collected simultaneously by operating a moving vehicle-based radar in a SAR mode, in conjunction with a stationary ground-based receiver.
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