A Fast Stepped-frequency Chirp Radar Imaging Method Based on NuFFT

2015 ◽  
Author(s):  
Kai Zhang Kai Zhang ◽  
Cheng Hu Cheng Hu ◽  
Changjiang Liu Changjiang Liu ◽  
Yin Xiang Yin Xiang
Keyword(s):  
Radar Imaging ◽  
Imaging Method ◽  
Frequency Chirp ◽  
Stepped Frequency

A novel cognitive ISAR imaging method with random stepped frequency chirp signal

2012 ◽  
Vol 55 (8) ◽  
pp. 1910-1924 ◽  
Author(s):  
Feng Zhu ◽  
Qun Zhang ◽  
Ying Luo ◽  
KaiMing Li ◽  
FuFei Gu
Keyword(s):  
Imaging Method ◽  
Chirp Signal ◽  
Frequency Chirp ◽  
Isar Imaging ◽  
Stepped Frequency

A novel imaging method for random stepped frequency SAR with low SNR

2017 ◽  
Vol 8 (12) ◽  
pp. 1190-1199
Author(s):  
Xingyu Lu ◽  
Weimin Su ◽  
Jianchao Yang ◽  
Yujiu Zhao ◽  
Chao Ma ◽  
...  
Keyword(s):  
Imaging Method ◽  
Low Snr ◽  
Stepped Frequency

scholarly journals Correction of Channel Imbalance for MIMO SAR Using Stepped-Frequency Chirps

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Xiulian Luo ◽  
Yunkai Deng ◽  
Robert Wang ◽  
Lei Guo ◽  
Mingjiang Wang
Keyword(s):  
Calibration Method ◽  
Synthetic Aperture ◽  
Chirp Pulse ◽  
Frequency Chirp ◽  
Channel Characteristics ◽  
Strong Point ◽  
Chirp Signals ◽  
Stepped Frequency ◽  
Peak Value ◽  
Wide Swath

To simultaneously achieve two-dimensional high resolution and wide swath in synthetic aperture radar (SAR), azimuth MIMO structure combined with stepped-frequency chirp signals was developed via splitting the antenna intoNsubapertures. During transmitting each subaperture transmits a chirp pulse at a different carrier frequency, while during receiving every subaperture receives theNscattered pulses at the same time. Separating theNscattered pulses received by each subaperture and downlinking them to the ground yieldN2different signal paths. Due to the dedicated network in the SAR system, the channel imbalance is inevitable. To correct the channel imbalance, this paper presents an external calibration method, where the channel characteristics are estimated from the peak value of a strong point target for each channel. Simulation and real raw data experiments are performed to validate the proposed method.

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