IEICE Transactions on Electronics
Online ISSN : 1745-1353
Print ISSN : 0916-8524
Special Section on Recent Progress in Electromagnetic Theory and Its Application
Calibration Method for Multi Static Linear Array Radar with One Dimensional Array Antenna Arranged in Staggered Manner
Yasunari MORITakayoshi YUMIIYumi ASANOKyouji DOIChristian N. KOYAMAYasushi IITSUKAKazunori TAKAHASHIMotoyuki SATO
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2018 Volume E101.C Issue 1 Pages 26-34

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Abstract

This paper presents a calibration method for RF switch channels of a near-range multistatic linear array radar. The method allows calibration of the channel transfer functions of the RF switches and antenna transfer functions in frequency domain data, without disconnecting the antennas from the radar system. In addition, the calibration of the channels is independent of the directivities of the transmitting and receiving antennas. We applied the calibration method to a 3D imaging step-frequency radar system at 10-20GHz suitable for the nondestructive inspection of the walls of wooden houses. The measurement range of the radar is limited to 0-240mm, shorter than the antenna array length 480mm. This radar system allows acquiring 3D imaging data with a single scan. Using synthetic aperture radar processing, the structural health of braces inside the walls of wooden houses can be evaluated from the obtained 3D volume images. Based on experiment results, we confirmed that the proposed calibration method significantly improves the subsurface 3D imaging quality. Low intensity ghost images behind the brace target were suppressed, deformations of the target in the volume image were rectified and errors the range distance were corrected.

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© 2018 The Institute of Electronics, Information and Communication Engineers
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