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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...
This paper investigates a sub-aperture imaging processing approach based on baseband azimuth scaling to resolve the azimuth spectrum aliasing problem in squinted sliding spotlight synthetic aperture radar (SAR). Squinted sliding spotlight model and the point target echo equation are established and azimuth spectrum is analyzed. The formula for calculating the sub-aperture length is also given to avoid...
Orthogonal binary sequences play an important role in Multiple-input multiple-output (MIMO) radar. However, mainly due to mathematical difficulties, the synthesis problem of multiple binary sequences with low auto and cross correlation sidelobes is still an open problem. In this paper, mismatched filter, which basically aims at reducing the sidelobe levels at the pulse compression output, is exploited...
A novel time division multiplexing of channel (TDMC) scheme for smart antenna is proposed. The scheme effectively reduces the number of radio frequency (RF) channels form N to one. In this scheme, each element is followed by an optical delay line with different time delays. The signals on different elements can pass through the only RF channel sequentially. Compared with other schemes, the TDMC can...
For moving targets warning in front of the automobile within 180° scan coverage in azimuth, a moving target detection (MTD) and angle estimation method of linear frequency modulated continuous wave (LFMCW) radar based on multi-beam receiving antenna is presented. By controlling, the received echo signals from two adjacent beams of multi-beam antenna are sampled into the receiver periodically and processed...
A four-phase model based on Markov chain is developed by this paper to describe the transformation process of project organization. Compared with existing research methods, the proposed model, which combines the advantages of both qualitative analysis and quantitative analysis, provides a new approach into managing organizational transformation and it shows that the transformation of a project organization...
A calibration method is proposed for the single RF channel digital beamforming (DBF) Antenna Array. The on-line test of the 0/π phase shifters is carried out by using time sequence phase weighting (TSPW) technique based on the known incident plane wave. After errors of all the shifters being obtained, the complex distribution on the aperture could be corrected. The corrected data are then used to...
In this paper, a novel dual-band Wilkinson power divider with 6:1 power dividing ratio is presented. For this purpose, two sections of coupled lines terminated with shorted stub are employed to replace the quarter-wavelength transmission lines in the classical single-band unequal Wilkinson power divider. Based on the evenodd analysis, the design equations are given. As an example, a dual-band Wilkinson...
In modern battlefield the jammer performing deception jamming of range gate pull off (RGPO) generates a false target and causes the radar to break its track on the target. The use of waveform diversity to remove the false target from the real one is considered. Received signal model under deception jamming is built on the base of the principle of RGPO. A new kind of design method for waveforms orthogonal...
A communication model of distributed embedded system was presented though introducing a multiple buses example. The paper analyzes the communication delay under interaction of computation and communication, allocating inter-processor communication links, and schedule communication. The complex system can be divided into several parts and then the algorithm is applied to all the parts respectively...
According to asynchronism of the sampling process and the transmission of the symbols, the original symbol can be estimated by use of the original symbol and the symbols around. The feedback multi-user DS-CDMA model that also had been existed was improved. The DS-CDMA blind source was seperated step by step, used the FastICA algorithm. The algorithm converges after iterates about 15 times. The result...
A novel waveform which consists of a pair of orthogonal coding waveforms transmitted in high pulse repetition frequencies (PRF) and low pulse repetition frequencies (LPRF) has been proposed. At the receiver, two signal processing channels perform the extraction of target range and Doppler information. Although two processing channels matches coding waveform, there still exists interference of the...
Applications such as high power light emitting diode (LED) and laser diode need a high output current source power supply. Low power dissipation and fast response are essential requirements for these solutions. Usually, accurate and fast direct output current sensing adds cost and power loss to the supply. This paper proposes a novel indirect load current signal extraction method for current source...
An EEG signal detection ensemble system to solve the low rate of vision detection is developed when analysis so many EEG signals. A novel FastICA method is presented, in which the independent component analysis approach is used to acquire the high order statistic information of EEG intrusion action mode and mapped the input mode space into the corresponding independent component space. Then the generalized...
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