An improved CS imaging algorithm for SA-BSAR is proposed. The preprocessing method is adopted to correct the azimuth space-variant and the revised CS function used to improve the imaging quality. The simulation result...
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ISBN:
(纸本)9781424484447
An improved CS imaging algorithm for SA-BSAR is proposed. The preprocessing method is adopted to correct the azimuth space-variant and the revised CS function used to improve the imaging quality. The simulation results demonstrate the validity of the algorithm.
An improved CS imaging algorithm for SA-BSAR is proposed. The preprocessing method is adopted to correct the azimuth space-variant and the revised CS function used to improve the imaging quality. The simulation result...
详细信息
An improved CS imaging algorithm for SA-BSAR is proposed. The preprocessing method is adopted to correct the azimuth space-variant and the revised CS function used to improve the imaging quality. The simulation results demonstrate the validity of the algorithm.
In order to overcome the azimuth spectrum folding occurrence in the spotlight imaging mode of the high resolution spaceborne Synthetic Aperture Radar (SAR), we presented a new subaperture chirp scaling algorithm (CSA)...
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ISBN:
(纸本)9780819469601
In order to overcome the azimuth spectrum folding occurrence in the spotlight imaging mode of the high resolution spaceborne Synthetic Aperture Radar (SAR), we presented a new subaperture chirp scaling algorithm (CSA) in this paper. Several phase functions of the extended CSA were modified according to the properties of subaperture processing. These modifications make the new algorithm realize the precise recombination of the phase history data of each subaperture without any additional computation load, making the subaperture overlapping and azimuth time extension unnecessary. The validity of this new algorithm is proved through point target simulations by adopting TerraSAR-X system parameters in the spotlight mode with I m resolution and a swath of 10Km both in the range and azimuth.
A moving target detection and high-resolution focusing scheme is presented for single-channel SAR systems. The moving target focusing is made of a bank of chirp scaling algorithms (CSA), each one matched to a differen...
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ISBN:
(纸本)9781424433940
A moving target detection and high-resolution focusing scheme is presented for single-channel SAR systems. The moving target focusing is made of a bank of chirp scaling algorithms (CSA), each one matched to a different along-track target velocity component, thus allowing to produce a high-resolution image of the target itself. The effectiveness of the proposed technique is shown with reference to a sample dataset obtained from a SAREX-92 image.
In this paper,a focusing approach is presented to widen the use of efficient monostatic imaging algorithms for azimuth-invariant bistatic synthetic aperture radar(SAR) *** bistatic range history is modeled by a polyno...
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In this paper,a focusing approach is presented to widen the use of efficient monostatic imaging algorithms for azimuth-invariant bistatic synthetic aperture radar(SAR) *** bistatic range history is modeled by a polynomial of azimuth *** this model,an analytic form of the signal spectrum in the 2D frequency domain is derived,and a simple single-valued relation between the transmitter and receive ranges is *** this way,a lot of monostatic image formation algorithms can be extended for the bistatic SAR data,and a bistatic chirp scaling algorithm is developed as an application of the new *** algorithm can be used to process the azimuth-invariant bistatic configuration where the transmitter and receiver platforms are moving on parallel tracks with the same *** addition,some simulation results are given to demonstrate the validity of the proposed approach.
This paper presents the design of one real-time imaging system in airborne C-band Synthetic Aperture Radar. The real-time imaging algorithm based on subaperture-division is described in detail. In order to meet real-t...
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ISBN:
(纸本)9781424411870
This paper presents the design of one real-time imaging system in airborne C-band Synthetic Aperture Radar. The real-time imaging algorithm based on subaperture-division is described in detail. In order to meet real-time signal. processing the signal processing board with 8 ADSP-TS201S digital signal processors and 2GB SDRAM is designed. This system has excellent real-time processing ability and tremendous data throughput and high expansibility. Finally the raw data of other airborne SAR is used in our real-time imaging system. The image is shown and the processing time is estimated. The results validate the feasibility of our system.
In this paper a refined extended chirpscaling (ECS) algorithm for high-resolution spaceborne spotlight synthetic aperture radar (SAR) imaging is presented. The squint range equivalent model is sel
In this paper a refined extended chirpscaling (ECS) algorithm for high-resolution spaceborne spotlight synthetic aperture radar (SAR) imaging is presented. The squint range equivalent model is sel
Instantaneous Doppler frequency for squint SAR imaging has been found with chirpscalingalgorithm (CSA). Because the azimuth sample is not perpendicular to the range sample,the range signal must impact on the azimuth ...
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Instantaneous Doppler frequency for squint SAR imaging has been found with chirpscalingalgorithm (CSA). Because the azimuth sample is not perpendicular to the range sample,the range signal must impact on the azimuth signal in the squint SAR data processing, andthe different slant range targets have different Doppler frequencies. From the mathematicalmodel of SAR echo signal, this paper carefully analyzes the instantaneous azimuth frequency, theinstantaneous Doppler frequency component of the azimuth frequency and the impact of rangechirp on azimuth frequency, which explains that Doppler frequency should be properly selected forcorrect SAR imaging in the squint SAR. The results of point target simulation experiments showthat the way is reasonable for the squint SAR and can effectively complete range compressionand azimuth focusing, and improve images' quality.
The VP(Vector Processor), designed and accomplished by ourselves, is an advanced processor, with BDSP9124/9320 as it's main component. It could process 1M samples data, and processing precision approaches the floa...
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ISBN:
(纸本)0780370007
The VP(Vector Processor), designed and accomplished by ourselves, is an advanced processor, with BDSP9124/9320 as it's main component. It could process 1M samples data, and processing precision approaches the float point processor. It could be applied for SAR (Synthetic Aperture Radar) and other fields. The CSA(chirp scaling algorithm) is suitable for the VP calculating. Using two-dimensional FFT to perform CSA, the VP could remove corner turning memory and reduce processing overhead. Using the large radix to complete FFT, it could also reduce the processing time. The VP could produce the satisfactory image with high resolution, in right and squint side looking strip mapping.
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