&lt;title&gt;Development of VHF CARABAS II SAR&lt;/title&gt;

Hellsten, Hans; Ulander, Lars M. H.; Gustavsson, A.; Larsson, B.

doi:10.1117/12.243087

Cited by 137 publications

(86 citation statements)

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“…At VHF, the thermal noise is very high with noise temperatures 50-60 dB higher than at microwaves [4]. Now, let us define X D as the resultant vector of the performed subtraction operation, which is given by…”

Section: Discussionmentioning

confidence: 99%

“…Also, it is worth mentioning that the images used in this letter have been equalized. More information about the system parameters used by airborne CARABAS-II can be found in [3], [4], and [10]. For this letter, we have used SAR images where the phase information has been removed by taking the absolute value of the data.…”

Section: Data Descriptionmentioning

confidence: 99%

“…[2], [3]. The research in this area has been largely stimulated by large-scale experiments using the Swedish airborne SAR system with the low-frequency wavelength-resolution CARABAS [1], [2], [4], [5].…”

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confidence: 99%

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The Stability of UWB Low-Frequency SAR Images

Machado

Pettersson

et al. 2016

IEEE Geosci. Remote Sensing Lett.

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This is the published version of a paper published in IEEE Geoscience and Remote Sensing Letters. Citation for the original published paper (version of record):Renato, M. (2016) The stability of UWB low-frequency SAR images. Letters, 13(8) Access to the published version may require subscription. The statistical analysis based on bivariate distribution data organized into different intervals of magnitude can be an important tool to further understand the properties of the backscattered signal for low-frequency SAR images. In this letter, it is found that, for "good" image pairs, the subtracted image has Gaussian distributed clutter backscattering and that the noise mainly consists of the thermal noise and, therefore, speckle noise does not have to be considered. This is a consequence of the stable backscattering for a UWB low-frequency SAR system. Index Terms-Bivariate distribution, CARABAS-II, clutter, statistical modeling, very high frequency synthetic aperture radar (VHF SAR). IEEE Geoscience and Remote Sensing

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Section: Discussionmentioning

confidence: 99%

Section: Data Descriptionmentioning

confidence: 99%

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The Stability of UWB Low-Frequency SAR Images

Machado

Pettersson

et al. 2016

IEEE Geosci. Remote Sensing Lett.

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“…In recent years, great interest has been devoted to the development of airborne radars working in the frequency range from VHF to UHF bands (e.g., see [1][2][3][4]). The combination of low frequencies with high relative bandwidth of such systems allows several military and civilian applications.…”

Section: Introductionmentioning

confidence: 99%

Multimode/Multifrequency Low Frequency Airborne Radar Design

Costanzo

Massa

Costanzo

et al. 2013

Journal of Electrical and Computer Engineering

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This work deals with the design of multimode/multifrequency airborne radar suitable for imaging and subsurface sounding. The system operates at relatively low frequencies in the band ranging from VHF to UHF. It is able to work in two different modalities: (i) nadir-looking sounder in the VHF band (163 MHz) and (ii) side-looking imager (SAR) in the UHF band with two channels at 450 MHz and 860 MHz. The radar has been completely designed by CO.Ri.S.T.A. for what concerns the RF and the electronic aspect, and by the University of Calabria for what concerns the design, realization, and test of SAR antennas. The radar has been installed on a civil helicopter and its operation has been validated in flight in both sounder and imager modality. Preliminary surveys have been carried out over different areas of Campania region, South Italy.

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“…Thus time-domain backprojection algorithms, whose origins stem from Global Backprojection (GBP) [3,4], are better suited for forming images in a WB SAR system. Two examples of WB SAR systems are CARABAS™ and LORA what are being developed at the Swedish Defense Research Agency (FOI) [5][6][7]. CARABAS is a VHF (20-90MHz) system while LORA is a dual band system with VHF (20-90MHz) and UHF (200-800MHz).…”

Section: Introductionmentioning

confidence: 99%

Detection of moving targets in wideband SAR

Pettersson

2004

IEEE Trans. Aerosp. Electron. Syst.

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Abstract-A likelihood ratio is proposed for moving target detection in a wide band (WB) SAR system. For this paper, WB is defined as any systems having a large fractional bandwidth, i.e. an ultra wide frequency band combined with a wide antenna beam. The developed method combines time domain fast backprojection SAR processing methods with moving target detection using space-time processing. The proposed method reduces computational load when sets of relative speeds can be tested using the same clutter suppressed sub-aperture beams. The proposed method is tested on narrow band radar data.

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<title>Development of VHF CARABAS II SAR</title>

Cited by 137 publications

References 0 publications

The Stability of UWB Low-Frequency SAR Images

The Stability of UWB Low-Frequency SAR Images

Multimode/Multifrequency Low Frequency Airborne Radar Design

Detection of moving targets in wideband SAR

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