Experiment of Azimuth-invariant Bistatic UHF UWB SAR

Hongtu Xie,Fuhai Li,Daoxiang An,Junfa Mao,Shaoying Shi,Guoqian Wang,Zhimin Zhou

doi:10.1088/1742-6596/960/1/012037

Abstract

Bistatic ultrahigh frequency ultrawideband synthetic aperture radar (UHF UWB SAR) has the well ability of the penetrating the foliage, high-resolution imaging and providing the increased information. In the paper, an imaging experiment of the azimuth-invariant bistatic UHF UWB SAR is described and the result is proposed. In August 2015, an along-track bistatic UHF UWB SAR experiment was conducted in China, and the raw data was collected. In this bistatic SAR system, the transmitter and receiver are both carried by a vehicle and separated by an invariable distance. The aim was to investigate the imaging property of the bistatic UHF UWB SAR system. Bistatic image was obtained using the subaperture spectrum-equilibrium method integrated with the fast factorized back projection algorithm (FFBPA). Experiment results prove the validity of the bistatic UHF UWB SAR experiment.

Highlights

Presently, a number of the remote sensing and geoscience applications are developed on the synthetic aperture radar (SAR) [1]-[3]
If the bistatic SAR system includes more than one transmitters or receivers, the imaging scene can be illuminated at the different angles, which can acquire the added information of scenes
Along-track bistatic SAR is an azimuth-invariant bistatic SAR system, whose transmitter and receiver are both carried by one platform and separated by an invariable distance

Summary

Introduction

A number of the remote sensing and geoscience applications are developed on the synthetic aperture radar (SAR) [1]-[3]. Ultrahigh frequency (UHF) ultrawideband (UWB) SAR system operates in the UHF UWB signal with a large fractional bandwidth and the wide antenna beamwidth associated with a large integration angle, so it can provide the higher resolution SAR image [10]-[12]. The along-track bistatic UHF UWB SAR experiment poses the various challenges, such as the synchronization between the transmitter and receiver, position measurement of the radars, polarimetric calibration, collection geometry planning and data processing. This bistatic SAR system’s position is obtained by the GPS motion compensation module and recorded on the electronic array to offer the motion compensation

Imaging experiment of the along-track bistatic UHF UWB SAR

Conclusion