High squint mode SAR imaging using modified RD algorithm

Wang, Wei; Wu, Weihua; Su, Weifeng; Zhan, Ronghui; Zhang, Jun

doi:10.1109/chinasip.2013.6625409

Cited by 7 publications

(10 citation statements)

References 7 publications

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“…It is necessary to note that there is an important difference between the existing RCMC and our proposed CF based method. As we know, the traditional RCMC methods generally choose the nearest slant range as references, further derive the migration momentum of the reference points mathematically, and then move the distance curves to the nearest slope distance in time domain or frequency domain [20,21]. Although these methods are useful in several scenarios, they do not take into account the parametric uncertainty of the system in actual flight cases, which lead to a large error between the migration equation and the actual migration curve.…”

Section: Discussionmentioning

confidence: 99%

“…The basic objective of range cell migration correction (RCMC) is to adjust the received echo of the same target back to the same range cell [20]. Traditionally, range cell migration can be corrected through time-domain interpolation or frequency-domain compensation [21]. The main problems of these methods are the excessive data operation and the narrow compatibility for 2 Journal of Electrical and Computer Engineering different SAR configurations.…”

Section: Introductionmentioning

confidence: 99%

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Signal Processing Based Remote Sensing Data Simulation in Radar System

Hao

Guo

2017

Journal of Electrical and Computer Engineering

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Range cell migration has a serious impact on the precision of image formation, especially for high-resolution and large-scale imaging. To get the full resolution and high quality of the image, the range cell migration correction in the azimuth time domain must be considered. For tackling this problem, this paper presents a novel and efficient range cell migration correction method based on curve fitting and signal processing. By emulating a curve to approximate the range-compressed echo of a strong point, the range location indexes of the strong point along the azimuth direction can be obtained under the least squares criterion. The merits of the proposed method are twofold: (1) the proposed method is robust to the uncertainty of system parameters (strong tolerance) under real flights and (2) the generalization of the proposed method is better and can be easily adapted to different synthetic aperture radar (SAR) modes (e.g., monostatic and bistatic). The experimental results on real remote sensing data from both the monostatic and the bistatic SAR demonstrate the effectiveness. The regressed distance curve is completely coincident with the trajectory of strong points of the echo. Finally, the imaging focus results also validate the efficiency of the proposed method.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Signal Processing Based Remote Sensing Data Simulation in Radar System

Hao

Guo

2017

Journal of Electrical and Computer Engineering

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“…When the effects of the squint angle are not negligible, a coupling-compensation filter is chosen as [1] …”

Section: Relevant Filtersmentioning

confidence: 99%

“…In [1], a modified range-Doppler algorithm (RDA), based on the range-azimuth coupling in the two-dimensional frequency domain, was proposed for SAR imaging at squint angles up to 80 • . In [2], a fractional chirp scaling algorithm (FrCSA) was proposed to deal with large range migration and strong space-variant properties of the SAR images produced in missile-borne missions at a squint angle of 40 • .…”

Section: Introductionmentioning

confidence: 99%

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An Improved Range-Doppler Algorithm for Sar Imaging at High Squint Angles

Chen¹,

Kiang²

2017

PIER M

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Abstract-An improved range-Doppler algorithm (RDA) is proposed to reconstruct images from synthetic aperture radar (SAR) data received at high squint angles. At a higher squint angle, a larger synthetic aperture is required to receive sufficient amount of data for image reconstruction, and the range migration also becomes more serious, which demands more computational load and larger memory size. The proposed method can generate better SAR images with less computational load and memory than the conventional RDA, which is verified by simulations.

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A modified SAR range-Doppler algorithm with Gaussian frequency waveforms

Ayad

Redadaa

2015

International Journal of Remote Sensing

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High-resolution synthetic aperture radar (SAR) imaging based on airborne representation has attracted much attention and considerable interest in many remote-sensing fields due to its potential for improving the data quality of various applications. To obtain the intended resolution, different effective algorithms have been proposed and improved by using several techniques, methods, and modifications of the radar waveforms. The range-Doppler is one of these algorithms where different waveforms are used to achieve the focusing of targets, especially chirp signals. In this article, we propose the use a new modulation called Gaussian linear frequency modulation to perform the Gaussian range-Doppler algorithm and compare its performance with the conventional range-Doppler algorithm. The comparison is carried out in several bands of the SAR. Also, the effectiveness of the proposed algorithm is performed and discussed for a simple point target. The simulation results show that the proposed algorithm can improve significantly the target focusing.

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High squint mode SAR imaging using modified RD algorithm

Cited by 7 publications

References 7 publications

Signal Processing Based Remote Sensing Data Simulation in Radar System

Signal Processing Based Remote Sensing Data Simulation in Radar System

An Improved Range-Doppler Algorithm for Sar Imaging at High Squint Angles

A modified SAR range-Doppler algorithm with Gaussian frequency waveforms

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