Optimal configuration of spaceborne bistatic SAR with GEO transmitter and LEO receiver

Wang, Yuekun; Lu, Zheng; Suo, Zhiyong; Zhu, Yu; Li, Zhenfang; Zhang, Qingjun

doi:10.1049/iet-rsn.2018.5215

Cited by 5 publications

(1 citation statement)

References 28 publications

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“…On the other hand, the concept of GEO-LEO bi/multistatic SAR was analyzed in [27][28][29][30], where multiple LEO satellites received the backscattered signal of GEO-SAR and achieved bi/multistatic SAR imaging. Enhanced spatial resolution and radiometric performance was achieved by GEO-LEO BiSAR.…”

Section: Introductionmentioning

confidence: 99%

A Novel Frequency-Domain Focusing Method for Geosynchronous Low-Earth-Orbit Bistatic SAR in Sliding-Spotlight Mode

et al. 2022

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The low-earth-orbit synthetic aperture radar (SAR) can achieve enhanced remote-sensing capabilities by exploiting the large-scale and long-duration beam coverage of a geosynchronous (GEO) SAR illuminator. Different bistatic imaging modes can be implemented by the steering of an antenna beam onboard the LEO receiver, such as high-resolution sliding-spotlight mode. In this paper, the accurate focusing of GEO-LEO bistatic SAR (GEO-LEO BiSAR) in sliding-spotlight mode is investigated. First, the two major problems of the accurate bistatic range model, i.e., curved trajectory within long integration time and ‘stop-and-go’ assumption error, for sliding-spotlight GEO-LEO BiSAR are analyzed. Then, a novel bistatic range model based on equivalent circular orbit trajectory is proposed to accurately represent the range history of GEO-LEO BiSAR in sliding-spotlight mode. Based on the proposed range model, a frequency-domain imaging method is put forward. First, a modified two-step preprocessing method is implemented to remove the Doppler aliasing caused by azimuth variance of Doppler centroid and beam steering. Then, an azimuth trajectory scaling is formulated to remove the azimuth variance of motion parameters due to curved trajectory. A modified frequency-domain imaging method is derived to eliminate the 2-D spatial variance and achieve accurate focusing of the echo data. Finally, imaging results and analysis on both simulated data and real data from an equivalent BiSAR experiment validate the effectiveness of the proposed method.

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Section: Introductionmentioning

confidence: 99%