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This paper addresses the sensor resource scheduling problem that allocating the radar resources to track targets under the time and energy constrains in the multi-radar system. The objective is to maximize the number of the targets which can be tracked and improve the utilization of the sensor resources. The optimal scheduling problem with maximize the tracking number and matching number is developed...
Geosynchronous SAR (GEO SAR) is susceptible to ionosphere due to the ultra-long integration time and ultra-wide coverage, resulting in image defocusing and image drift. This paper demonstrates a validation experiment of analysing ionospheric impacts on GEO SAR focusing. The validation experiment consists of data acquisition of the global navigation satellites system (GNSS) satellites signals (including...
In this paper, a fast fixed-point simulation technology is proposed for a multi-channel synthetic aperture radar (SAR) imaging system. The overall computations in the SAR imaging algorithm is explicitly analysed. FFT operations account for most memory consumption in the imaging flow. Accordingly, a fixed-point FFT algorithm is adopted due to the trade-off between precision and memory occupation of...
In this paper, we investigate communication performance optimization problem of spaceborne/airborne Radar networks. A model of spaceborne/airborne Radar networks with propagation delay and power constraints is given first. A Quadric Lyapunov function based Algorithm (QLA) is then proposed aiming at greedily minimizing an expression containing Lyapunov drift. We prove two main conclusions, one is that...
This paper presents a development of a narrowband high-temperature superconducting filter with high selectivity. The center frequency of this filter is 8.625 GHz and the 3 dB bandwidth is 156 MHz (a fractional bandwidth of 1.81 %). In order to achieve high band edge steepness, we introduce a 10-resonator quasi-elliptic function response with two pairs of transmission zeros in the cascaded quadruplet...
In this paper, an FPGA-based moving object detection and tracking system is introduced for image processing application. The algorithms presented include object detection based on dynamic background difference, Kalman filter for object tracking. The target device for the implementation is a Xilinx Zynq-7000 FPGA. The use of ARM dual core processor, NEON vector coprocessor unit and coprocessing IP...
FMCW (frequency-modulated continuous wave radar) modulations have been popularly implemented in the automotive radar applications. This document demonstrates system requirement for a new FMCW modulation — fast chirp modulation. It largely improves the range resolution compare to general automotive FMCW Radar system. A practical RF-front end system is also presented at the end of the paper.
EMVS is able to stably perceive signals with different forms of polarization, and achieve a precise parameter estimation. As tensor method used in this kind of arrays, the performance is greatly improved. On the other hand, the traditional signal model often cannot intuitively describe the uncompletely polarized signal. In this paper, BTD from tensor algebra was adopted, while the modeling and analyzing...
Microwave tubes are vacuum electron devices used for the generation and amplification of radio frequencies in the microwave frequency range. Klystron is a kind of microwave tubes which is used in radar. A sheet-beam Extended Interaction Klystron (SBEIK) is an attractive MMW amplifier because of its high gain per unit length and compact configuration. The RF structure is an important part of the whole...
In this paper, with the help of a new statistical model, the problem of detecting the changes that occurred on the ground by analyzing SAR imagery is addressed by a completely unsupervised approach. In the proposal change detection approach, a difference image of two multitemporal SAR images is firstly produced by the generalized likelihood ratio operator. After that, a new statistical model is particularly...
An accurate non-contact amplitude retrieval of the periodic movement is proposed in this paper. Firstly, the backscattered signal of a vibrational target can be expanded as a series of harmonics whose amplitudes are determined by the vibration amplitude. Then, based on the least squares estimation, all the available harmonics are utilized to suppress the influence of the signal noise on the vibration...
Micro-Doppler features can be regarded as a unique signature of ISAR targets and provide critical information for target recognition. This paper proposes an ISAR micro-Doppler feature extraction and recognition method based on combination algorithm of principle component analysis (PCA) and independent component analysis (ICA). In order to decrease computation burden, PCA algorithm is first applied...
With the rapidly development of video satellites, which provide sequential remote sensing images, amounts of data with high quality information are hunted to disposition. Object detection is one of the useful applications for video satellite and we focus on plane detection in this paper. Previous object detection methods focus on spatial structure rather than temporal information because they handle...
Coherent video modeling of pulsed Doppler radar seeker (PDRS) for the six degree of freedom (6-DOF) closed loop trajectory simulation is discussed, which provides an efficient tool to the design and evaluation of surface-to-air missile (SAM). The topics covered are waveforms consideration, radar antenna modelling, target scattering characteristics, receiver processing, signal processor design and...
Multi-channel phased array radar has the following advantages: detection multiple target, far work distance, anti-interference capability, and sensitive response, etc. The squint SAR (Synthetic Aperture Radar) is an effective means of detection in complex background in all-weather and all-day. Multi-channel phased array radar needs the consistency of amplitude and phase. The design of the system parameter...
Monopulse radar antenna is one of the most exact electronic directional techonolgies now, and it is extensively used in microwave and millimeter wave tracking, survellian, communication, measurement and astronomical system. However, in order to protect the radar antenna from environment's influence, lots of monopulse antennas all use radome, which will induce affect on antenna's polarization characteristic...
The core problem of microwave imaging is to acquire high azimuth resolution. The universal solution is synthetic aperture radar (SAR) utilizing the relative movement between radar and target scene. Recently some researchers propose a novel imaging scheme called microwave staring imaging for motionless platform based on wavefront modulation in azimuth. However, it's not suitable for low-speed platform...
Registration is an effective pre-processing for amounts of applications like image mosaic, mapping, remote detection, and change detection. The scale-invariant feature transform (SIFT) and block matching are two widely algorithms for registration in computer vision. However, as a result of speckle noises, the two algorithms perform unsatisfactorily on synthetic aperture radar (SAR) images. In this...
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