Low-frequency ultra-wide-band SAR system calibration

Hanhua Zhang; Fulai Liang; Peng Yu Wang; Qian Song

doi:10.1117/12.2031272

26 October 2013 Low-frequency ultra-wide-band SAR system calibration

Hanhua Zhang, Fulai Liang, Peng Yu Wang, Qian Song

Proceedings Volume 8917, MIPPR 2013: Multispectral Image Acquisition, Processing, and Analysis; 891707 (2013) https://doi.org/10.1117/12.2031272
Event: Eighth International Symposium on Multispectral Image Processing and Pattern Recognition, 2013, Wuhan, China

Abstract

For quick detection of “open field” targets and landmines in tussock grass over wide area AMUSAR system must operate in low frequency below 500MHz and high frequency above 2.5GHz. The previous system calibration method used in AMUSAR adopts a compromise in single calibration object such as 0.1m trihedral. But for the frequency band between 500MHz and 1GHz, the 0.1m trihedral locates in Relay region with low signal-to-noise ratio (SNR). In order to improve performance of penetration, we make some modifications as follows. The data between 1GHz and 2.5GHz is calibrated by 0.1m trihedral. Since the 0.3m trihedral exhibits small fluctuation and large RCS between 500MHz and 1GHz, it ensures the SNR of calibration data. So the data is calibrated by 0.3m trihedral in this frequency band. The results show that the proposed method calibrates the system errors more efficiently and thus enhance the performance of imaging.

Citation Download Citation

Hanhua Zhang, Fulai Liang, Peng Yu Wang, and Qian Song "Low-frequency ultra-wide-band SAR system calibration", Proc. SPIE 8917, MIPPR 2013: Multispectral Image Acquisition, Processing, and Analysis, 891707 (26 October 2013); https://doi.org/10.1117/12.2031272

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KEYWORDS

Calibration

Synthetic aperture radar

Land mines

Imaging systems

Signal to noise ratio

Antennas

Image quality

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