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Remote Sens. 2013, 5(3), 1292-1310; doi:10.3390/rs5031292
Article

Azimuth-Variant Signal Processing in High-Altitude Platform Passive SAR with Spaceborne/Airborne Transmitter

*  and
School of Communication & Information Engineering, University of Electronic Science andTechnology of China, Chengdu 611731, China
* Author to whom correspondence should be addressed.
Received: 15 January 2013 / Revised: 19 February 2013 / Accepted: 22 February 2013 / Published: 14 March 2013
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Abstract

High-altitude platforms (HAP) or near-space vehicle offers several advantages over current low earth orbit (LEO) satellite and airplane, because HAP is not constrained by orbital mechanics and fuel consumption. These advantages provide potential for some specific remote sensing applications that require persistent monitoring or fast-revisiting frequency. This paper investigates the azimuth-variant signal processing in HAP-borne bistatic synthetic aperture radar (BiSAR) with spaceborne or airborne transmitter for high-resolution remote sensing. The system configuration, azimuth-variant Doppler characteristics and two-dimensional echo spectrum are analyzed. Conceptual system simulation results are also provided. Since the azimuth-variant BiSAR geometry brings a challenge for developing high precision data processing algorithms, we propose an image formation algorithm using equivalent velocity and nonlinear chirp scaling (NCS) to address the azimuth-variant signal processing problem. The proposed algorithm is verified by numerical simulation results.
Keywords: high-altitude platform; near-space vehicle; synthetic aperture radar (SAR); bistatic SAR; azimuth-variant; passive radar; near-space; chirp scaling; azimuth resolution high-altitude platform; near-space vehicle; synthetic aperture radar (SAR); bistatic SAR; azimuth-variant; passive radar; near-space; chirp scaling; azimuth resolution
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Wang, W.-Q.; Shao, H. Azimuth-Variant Signal Processing in High-Altitude Platform Passive SAR with Spaceborne/Airborne Transmitter. Remote Sens. 2013, 5, 1292-1310.

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