DLR Compact Test Range facility

Limbach, Markus; Gabler, Bernd; Maria, A. Di; Horn, Ralf; Reigber, Andreas

doi:10.1109/eucap.2012.6206309

Cited by 14 publications

(11 citation statements)

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“…The center frequency of the real antenna is slightly shifted due to fabrication tolerances. The radiation pattern of the manufactured single element, measured at the DLR Compact Test Range of the Microwaves and Radar Institute [7], shows an outstanding agreement with the simulation. The measured gain of polarization H (6.1 dBi) and V (6 dBi) differs only approximately 0.3 dB from the simulated values.…”

Section: B Manufactured Single Elementmentioning

confidence: 52%

L-Band Antenna Array for Next Generation DLR Airborne SAR Sensor

Lorente

Limbach

Gabler

2019

2019 12th German Microwave Conference (GeMiC)

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The Microwaves and Radar Institute at the German Aerospace Center (DLR) operates an airborne versatile multi-frequency SAR sensor (F-SAR). Due to the applications of remote-sensing imaging at low frequencies, a new dual polarized L-Band antenna system for the next generation sensor is presented in this paper. Despite the restricted size of the used aircraft, the new antenna optimizes the available space in the antenna carrier by providing more antenna elements, in comparison with the current L-Band sensor, without increasing the inter-element mutual coupling and thereby enhancing the radiation properties of the antenna.

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Section: B Manufactured Single Elementmentioning

confidence: 52%

L-Band Antenna Array for Next Generation DLR Airborne SAR Sensor

Lorente

Limbach

Gabler

2019

2019 12th German Microwave Conference (GeMiC)

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“…Best results could be obtained using a novel time-domain calibration approach based on full 3D (range-azimuth-frequency) antenna patterns, as have been measured at the in-house compact test range facility of the DLR (see Fig. 4) [1].…”

Section: Radiometric Calibrationmentioning

confidence: 99%

System status and calibration of the F-SAR airborne SAR instrument

Reigber

Jäger

Fischer

et al. 2011

2011 IEEE International Geoscience and Remote Sensing Symposium

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The F-SAR airborne SAR instrument represents the successor of the E-SAR system of the German Aerospace Center (DLR), which has been extensively used in the last three decades. Its development was triggered by the current demand for data being simultaneously acquired at different wavelengths and polarisations as well as by the demand for very high resolution in the order of decimetres. F-SAR is a modular development utilising the most modern hardware and commercial off the shelf components. As for E-SAR DLRs Dornier DO228-212 aircraft is the first choice as platform for the new system.Although the F-SAR system is still under development, it is already taking over some of the operational duties of the old E-SAR system. This paper will analyse the performance of the current system, based on the multi-frequency and fully polarimetric imagery acquired during several campaigns in the last two years. Since F-SAR is using a fixed antenna mount without gimbal, precise radiometric calibration is particularly challenging, especially in the shorter wavelengths. Therefore, special emphasis is placed on the system calibration and the associated quality control including the achieved spatial resolution and radiometric accuracy in the different bands.Index Terms-airborne SAR, calibration F-SAR INSTRUMENT DESIGN AND STATUSF-SAR is designed to operate fully polarimetrically at X-, C-, S-, L-and P-bands and will provide single-pass polarimetric interferometric capabilities in X-and S-bands. Repeatpass PolInSAR is a standard measurement mode for the other bands. Range resolution is determined by the available system bandwidth. While components limit system bandwidth to 100MHz at P-band, a step-frequency approach is adopted to achieve up to 760MHz effective signal bandwidth at X-band to satisfy the requirement for very high resolution [2]. An overview of the general design parameters can be found in Tab. 1.A special antenna mount was designed to fix planar array antennas to the aircraft. In fully-fledged multi-frequency configuration, it holds seven right-looking dual polarised antennas: three in X-band, one in C-band, two in S-band and one in L-band. The P-band antenna will be mounted under the nose of the aircraft. The antenna mount has the important advantage of making it easy to change the antenna configuration and to mount other antennas without necessitating additional individual airworthiness certification procedures. The nominal antenna configuration provides three single-pass interferometers: across track (XTI) in S-band and X-band, and along track (ATI) in X-band. The mechanical baselines are approx. 1.60m (XTI) and approx. 85cm (ATI). Special configurations, such as a GMTI antenna array in the top frame, are planned [3].For regular Earth observation purposes the radar covers an off-nadir angle range of 25 to 60 degrees at altitudes of up to 6000m above sea level, which is the maximum operating altitude of the DO228 aircraft. In special applications, other off-nadir angle ranges, such as 60 to 85 degrees for long stand-off ...

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“…In both plots, the patterns considering the lower antennas (X1 and S1) as both receiver and transmitter are shown in black curve, the patterns considering the lower antennas as transmitter and the upper as receiver are shown in red curve, and finally, the patterns considering the upper antennas as transmitter and receiver are shown in blue curve. compact test range (CTR) facility [61] are shown in Fig. 4.…”

Section: A F-sar Multipath Characterizationmentioning

confidence: 99%

Generation of Highly Accurate DEMs Over Flat Areas by Means of Dual-Frequency and Dual-Baseline Airborne SAR Interferometry

Pinheiro

Reigber

Scheiber

et al. 2018

IEEE Trans. Geosci. Remote Sensing

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In this paper, a dual-frequency and dual-baseline (DFDB) processing framework for the extraction of highprecision terrain information from airborne interferometric synthetic aperture radar (SAR) data is presented. Specifically, we propose the use of two single-pass data sets acquired simultaneously in two different frequency bands and two largebaseline repeat-pass data sets also acquired simultaneously in two frequency bands. The configuration profits from the stability of the single-pass derived elevation maps in relation to spatially correlated artifacts as well as from the increased sensitivity associated with large-baseline acquisitions. Moreover, the dualfrequency nature of the data set enables the tackling of the phase unwrapping issue, promoting the retrieval of unambiguous measurements. Several algorithms for the interferometric processing of the DFDB airborne data set are proposed, including the outline of multichannel phase calibration and unwrapping error correction strategies and approaches to remove spatially correlated artifacts and extract the common underlying topography. Elevation models generated from a DFDB data set acquired with the airborne F-SAR sensor over tidal flats in northern Germany are presented, and comparisons with an airborne laser scanner reference show errors with a standard deviation of around 14 cm and a mean absolute deviation of less than 10 cm. Index Terms-Digital elevation model (DEM), dual frequency, repeat-pass interferometry, SAR interferometry (InSAR). 0196-2892

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DLR Compact Test Range facility

Cited by 14 publications

References 0 publications

L-Band Antenna Array for Next Generation DLR Airborne SAR Sensor

L-Band Antenna Array for Next Generation DLR Airborne SAR Sensor

System status and calibration of the F-SAR airborne SAR instrument

Generation of Highly Accurate DEMs Over Flat Areas by Means of Dual-Frequency and Dual-Baseline Airborne SAR Interferometry

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