KEYWORDS: Data acquisition, Clocks, Data processing, Analog electronics, Field programmable gate arrays, Interfaces, Transceivers, Optical fibers, Channel projecting optics
In order to improve the problem of multi-channel and high-speed synchronous data sampling, a Broadband Signal synchronous sampling system of the inside and between boards is designed. It includes high-speed ADs with auto synchronous function, the synchronous sampling technology of between boards, analog light-module, digital light-module, GTX(Gigabit Transceiver) transmission technology. It ensures multi-channel synchronous data sampling and the phase coincidence indicator. Insides, the system can be realized easily and has stable synchronous performance and good extensibility. It can be widely implemented in area such as SAR, radiometer, phased array radar and so on.
KEYWORDS: Electronic filtering, Radar, Signal to noise ratio, Signal detection, Reconnaissance, Modulation, Interference (communication), Computer simulations, Signal processing, Linear filtering
In order to quickly scout the radar signal and accurately estimate the pulse arrive time, this paper proposes an estimation algorithm of pulse arrive time based on the differential filter in time domain. The simulation result shows that the proposed method has high accuracy of time estimation and the process time is shorter than the algorithm in frequency domain. So it can be used in engineering application.
KEYWORDS: Radar, Signal generators, Signal processing, Field programmable gate arrays, Signal to noise ratio, MATLAB, Signal detection, Numerical analysis, Microwave radiation, Lithium
Aimed at improving the detecting ability of spaceborne microwave radar system on the week target, a window function should be added when processing the LFM signals at the cost of SNR loss and mainlobe spreading. To solve this problem, transmitting NLFM signal in the radar signal generator is a better solution. In this paper, we propose a spaceborne NLFM signal design principle, and give the simulation result. And then the hardware implementation using Xilinx Zynq Ultrascale+RFSoC device is introduced. Finally, the test result is given with the Chebyshev window, which the PSLR result is better than -46dB.
A novel image inpainting algorithm based on sparse analysis model is proposed. The model is formulated on an analysis dictionary. The dictionary is updated using a least-squares method. The experiments on images demonstrate improved performance in peak signal to noise ratio (PSNR) compared to other image inpainting methods including AMLE Inpainting, Harmonic Inpainting, Mumford-Shah Inpainting, and Transport Inpainting algorithm. The evaluation results showed that our proposed algorithm has better performance.
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