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Video Synthetic Aperture Radar (ViSAR) is a novel technique to continuously monitor moving targets in the interested area. From the video echo provided by the ViSAR system, the motion trail of the moving target can be easily obtained. Therefore, the echo of the moving target should be carefully studied, which is important in practical application for moving targets tracking in ViSAR system.
Video Synthetic Aperture Radar (ViSAR) is the new application of SAR technique. Through reasonable system parameter design, ViSAR system can obtain the SAR image at a faster image rates (also referred to herein as frame rate) which permit the detection of dynamic changes that are occurring in the target scene. Therefore, frame rate as one of the core parameters of ViSAR system should be carefully...
Reduced-dimension space-time adaptive processing (STAP) techniques are good choices in multichannel wide-area surveillance airborne systems to suppress ground clutter. However, their performance often degrades in nonhomogeneous environments due to the inaccurate estimation of the interference covariance matrix from the secondary data. In this paper, combing with Kalman filtering, we propose a novel...
In this letter, we suggest using multiple azimuth channels (MACs) for synthetic aperture radar in the sliding spotlight mode. First, we analyze the scene size constraints of conventional sliding spotlight mode, showing that a large scene size requires long scene illumination time. However, while using multiple channels in azimuth, this could be changed. Dividing a long antenna into small antennas,...
A MIMO-SAR framework based on frequency diversity is presented. The variety of carrier frequency causes the phase modulation and the change of FM rate in azimuth. They will bring spurious responses in the final radar imaging. The influence of phase modulation is overcome by selecting an appropriate sampling rate to the range signal. When the range cell migration can be neglected, we can assume the...
Magnetometers used in the measurement-while-drilling (MWD) usually suffer from the deviation of the earthpsilas magnetic field by a variety of external factors, and they are expensive and heavy. The solid vibration gyro based on Micro-quartz material, as a candidate to the Magnetometer surveying sensor in MWD, was presented in this paper. A rectangle shape vibrator supported by two rings was used...
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