Enhancement Method for Range Ambiguity to Signal Ratio due to Beam
                        Dispersion and Altitude Change in Wideband Satellite Synthetic Aperture
                        Radar

Hybrid quadrature polarimetric (hybrid quad-pol) synthetic aperture radar (SAR) is proposed as a potential candidate for the full-polarimetric SAR mode. It allows balanced range ambiguity performance and simplified system structure. System based on hybrid-pol SAR mode can also implement the conventional quad-pol mode and the compact-pol mode via few adjustments. However, the azimuth ambiguity performance in cross-pol channels is proved deteriorated in hybrid quad-pol mode due to the lopsided energy distribution of ambiguities. As are generally called “ghost” targets, azimuth ambiguities usually influence the recognition of the targets in SAR imaging. This letter describes how to remove the false targets that arise from azimuth ambiguities by means of waveform diversity and dual-focus post-processing (DFPP) technique. The proposed method exploits the feature of azimuth ambiguity and yields improved image quality in cross-pol channels with strong co-pol azimuth ambiguities removed in hybrid quad-pol SAR at a low system cost. Furthermore, it offers remarkable benefits for target detecting and recognition with strong false targets removed.

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Range ambiguity suppression for multiple-input, multiple-output synthetic aperture radar system using azimuth phase coding technique

Journal of Applied Remote Sensing ◽

10.1117/1.jrs.8.083519 ◽

2014 ◽

Vol 8 (1) ◽

pp. 083519 ◽

Cited By ~ 1

Author(s):

Lei Guo ◽

Robert Wang ◽

Yunkai Deng ◽

Wei Wang ◽

Xiulian Luo

Keyword(s):

Synthetic Aperture Radar ◽

Multiple Input Multiple Output ◽

Radar System ◽

Synthetic Aperture ◽

Phase Coding ◽

Range Ambiguity ◽

Multiple Input ◽

Input Multiple Output ◽

Synthetic Aperture Radar System ◽

Aperture Radar

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Optimal Design of the Reflector Antenna to Improve Performance of C-Band Quad-Pol ScanSAR Systems

Journal of Electromagnetic Engineering and Science ◽

10.26866/jees.2020.20.2.155 ◽

2020 ◽

Vol 20 (2) ◽

pp. 155-157 ◽

Cited By ~ 2

Author(s):

Jung-Hwan Lim ◽

Jae Wook Lee ◽

Taek-Kyung Lee ◽

Sang-Burm Ryu ◽

Hyeon-Cheol Lee ◽

...

Keyword(s):

Synthetic Aperture Radar ◽

Operation Mode ◽

Reflector Antenna ◽

Synthetic Aperture ◽

Improve Performance ◽

Signal Ratio ◽

Target Performance ◽

Wide Swath ◽

Aperture Radar

The performance of synthetic aperture radar (SAR) antenna determines the quality of images obtained from the spaceborne SAR system, and thus, SAR antenna should be designed to satisfy the target performance of SAR system. The performance indicators of a SAR system, such as ambiguity-to-signal ratio and resolution, also depend on the SAR operation mode. Therefore, it is important to consider the operation mode when designing an SAR antenna. In this paper, we analyzed the SAR antenna’s effect on ScanSAR (scanning synthetic aperture radar) which is a representative wide-swath mode and its quadrature-polarimetric (quad-pol) mode. In addition, we confirmed that the optimal reflector antenna for the C-band quad-pol ScanSAR system can be designed by analyzing the relation between the antenna size and the system performance.

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