scholarly journals Research of a Radar Imaging Algorithm Based on High Pulse Repetition Random Frequency Hopping Synthetic Wideband Waveform

Sensors ◽  
2019 ◽  
Vol 19 (24) ◽  
pp. 5424 ◽  
Author(s):  
Songhua He ◽  
Xiaotian Wu
Keyword(s):  
Pulse Compression ◽  
Coupling Effect ◽  
Frequency Hopping ◽  
Pulse Repetition ◽  
Imaging Method ◽  
Image Processing Algorithm ◽  
Compression Process ◽  
Imaging Algorithm ◽  
Random Frequency ◽  
High Pulse

Aiming at the imaging algorithm of high-pulse-repetition random-frequency-hopping synthetic wideband radar on a supersonic/hypersonic aircraft platform, this study established an echo simulation model of target and clutter, analyzed the special range-Doppler coupling effect and its influence on imaging, and proposes a method of imaging with pipeline-parallel processing based on generalized 2D matched-filtering and Doppler pre-processing. In the method, Doppler-beam-sharpening was advanced to be performed with the pulse compression process in each frame, and the special range-Doppler coupling effect caused by high dynamic motion of platform and random frequency hopping in bandwidth synthesis was well suppressed; several modes of random frequency hopping were designed and the pipeline-parallel image processing algorithm was optimized for each mode. Theoretical analysis and simulation results show that the proposed imaging method can effectively avoid the divergence of 2D range-Doppler images in the range direction, and can meet the requirements of real-time imaging.

High pulse repetition frequency all-solid-state 1053 nm Nd:YLF laser

2010 ◽  
Vol 7 (10) ◽  
pp. 722-725 ◽  
Author(s):  
Y. Sun ◽  
H. Zhang ◽  
Q. Liu ◽  
L. Huang ◽  
Y. Wang ◽  
...  
Keyword(s):  
Solid State ◽  
Pulse Repetition Frequency ◽  
Repetition Frequency ◽  
Pulse Repetition ◽  
High Pulse ◽  
High Pulse Repetition Frequency

scholarly journals A 3-D SAR Imaging Method Based on Back Projection Algorithm

2021 ◽  
Vol 2083 (3) ◽  
pp. 032050
Author(s):  
Qian Han ◽  
Pengbo Wang ◽  
Xinkai Zhou ◽  
Xinchang Hu ◽  
Yanan Guo
Keyword(s):  
3D Imaging ◽  
Bp Algorithm ◽  
Projection Algorithm ◽  
Imaging Method ◽  
Back Projection ◽  
Imaging Processing ◽  
Imaging Algorithm ◽  
Imaging Results ◽  
2D Imaging ◽  
Low Efficiency

Abstract 3D back projection (BP) algorithm is an imaging algorithm based on time domain echo data, which effectively solves the overlapping mask problem existing in 2D SAR. It can complete the imaging processing of echo signal under any geometry configuration, and has the advantages of high target focusing accuracy and high phase preservation. However, the high complexity and low efficiency of 3D BP imaging algorithm limit its application and development. In this paper, a 3d imaging method based on improved back projection algorithm is proposed. Aiming at the problem that existing imaging algorithms need 2D imaging first and then 3D imaging, an improved 3D BP algorithm is proposed to directly 3D imaging, which avoids 2d imaging processing. The proposed method simplifies the steps of the traditional 3D BP algorithm and improves the efficiency of the algorithm. The validity and effectiveness of the proposed method are verified by the 3d imaging results of simulated lattice targets.

Laser Monitors for High Speed Imaging of Plasma, Beam and Discharge Processes

2016 ◽  
Vol 712 ◽  
pp. 303-307 ◽  
Author(s):  
Maxim V. Trigub ◽  
Stanislav N. Torgaev ◽  
Gennadiy S. Evtushenko ◽  
Vitaliy V. Drobchik
Keyword(s):  
High Speed ◽  
Metal Vapor ◽  
Optical Systems ◽  
Imaging Method ◽  
High Speed Imaging ◽  
Destructive Testing ◽  
Copper Bromide ◽  
Imaging Results ◽  
High Pulse ◽  
Non Destructive

The imaging results of different processes blocked from the observation by the intense background light are presented in this paper. Active optical systems based on high-frequency brightness amplifier are used to decrease the negative factor of the glare. The experimental and modeling results on obtaining high pulse repetition frequencies (PRF) (more than 100 kHz) of copper bromide vapor brightness amplifiers operating in a low input energy mode are shown. The use of metal vapor brightness amplifiers for visual non-destructive testing of fast processes obscured by the glare is also discussed. It has been shown that the imaging method proposed in this paper proves to be the most reliable to obtain the information about objects or processes in a real time mode using high PRF CuBr active media.

Aerothermodynamic and Thermal Phenomena in a High Pulse-Repetition Rate XeCl Laser

1995 ◽  
pp. 335-340
Author(s):  
J. P. Truong ◽  
O. Uteza ◽  
M. L. Sentis ◽  
P. Delaporte ◽  
B. Forestier ◽  
...  
Keyword(s):  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Pulse Repetition ◽  
Xecl Laser ◽  
High Pulse Repetition Rate ◽  
High Pulse ◽  
Thermal Phenomena

scholarly journals Dentin bond strength after ablation using a CO 2 laser operating at high pulse repetition rates

2009 ◽  
Author(s):  
Saba Hedayatollahnajafi ◽  
Michal Staninec ◽  
Larry Watanabe ◽  
Chulsung Lee ◽  
Daniel Fried
Keyword(s):  
Bond Strength ◽  
Pulse Repetition ◽  
High Pulse

Optically pumped terahertz lasers with high pulse repetition frequency: theory and design

2009 ◽  
Vol 7 (2) ◽  
pp. 127-129 ◽  
Author(s):  
孙玉德 Yude Sun ◽  
付石友 Shiyou Fu ◽  
王静 Jing Wang ◽  
孙正和 Zhenghe Sun ◽  
张延超 Yanchao Zhang ◽  
...  
Keyword(s):  
Pulse Repetition Frequency ◽  
Frequency Theory ◽  
Repetition Frequency ◽  
Pulse Repetition ◽  
Optically Pumped ◽  
High Pulse ◽  
Terahertz Lasers ◽  
High Pulse Repetition Frequency
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