A TDMA MIMO SAR radar for automated position-keeping

Zhonghai Wang; Xingping Lin; Steven Cumber; Ensign John Fish; Khanh Pham; Erik Blasch; Genshe Chen; Dan Shen; Bin Jia; Gang Wang

doi:10.1117/12.2177546

22 May 2015 A TDMA MIMO SAR radar for automated position-keeping

Zhonghai Wang, Xingping Lin, Steven Cumber, Ensign John Fish, Khanh Pham, Erik Blasch, Genshe Chen, Dan Shen, Bin Jia, Gang Wang

Author Affiliations +

Proceedings Volume 9469, Sensors and Systems for Space Applications VIII; 94690E (2015) https://doi.org/10.1117/12.2177546
Event: SPIE Defense + Security, 2015, Baltimore, MD, United States

Abstract

This paper presents a time division multiple access (TDMA) multiple-input and multiple-output (MIMO) synthetic aperture radar (SAR) with a sliding range window for automated position-keeping, which can be applied in vessel tracking/escorting, offshore deepwater drillship equipment servicing, etc. A MIMO SAR sensor predefines a special part of the target (i.e., the drillship, ship, or submarine) as the measurement target and does not need special assistant devices/targets installed on the target vessel/platform, so its application is convenient. In the measurement process, the sensor scans the target with multiple ranging gates, forms images of multiple sections of the target, detects the predefined part/target in these images, and then obtains the range and angle of the predefined target for relative localization. Our MIMO SAR has 13 transmitting antennas and 8 receiving antennas. All transmitting antennas share a transmitter and all receiving antennas share a receiver using switches to reduce cost. The MIMO SAR radar has 44 effective SAR phase centers, and the azimuth angle resolution is θ_0.5/44 (finest, θ _0.5 is the antenna element’s 3dB beamwidth). The transmitter transmits a chirped linear frequency modulated continuous wave (LFMCW) signal, and the receiver only processes the signal limited in the beat frequency region defined by the distance from the measurement target to the sensor and the interested measurement target extension, which is determined by the receiver bandwidth. With the sliding range window, the sensor covers a large range, and in the covered range window, it provides high accuracy measurements.

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Zhonghai Wang, Xingping Lin, Steven Cumber, Ensign John Fish, Khanh Pham, Erik Blasch, Genshe Chen, Dan Shen, Bin Jia, and Gang Wang "A TDMA MIMO SAR radar for automated position-keeping", Proc. SPIE 9469, Sensors and Systems for Space Applications VIII, 94690E (22 May 2015); https://doi.org/10.1117/12.2177546

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KEYWORDS

Synthetic aperture radar

Antennas

Radar

Receivers

Sensors

Bandpass filters

Target detection

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