Analysis of system concepts for bi- and multi-static SAR missions

Krieger, Gerhard; Fiedler, Hauke; Houman, D.; Moreira, Alberto

doi:10.1109/igarss.2003.1293912

Cited by 57 publications

(48 citation statements)

References 3 publications

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“…One promising approach uses multiple passive receiver satellites in conjunction with a geostationary illuminator (cf. Fig 2, see also [12]- [17]). This concept allows for a systematic reduction of the revisit times as well as an upgrade to other imaging modes like cross-track interferometry (cf.…”

Section: Frequent Monitoringmentioning

confidence: 99%

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Spaceborne bi- and multistatic SAR: potential and challenges

Krieger

Moreira

2006

IEE Proc., Radar Sonar Navig.

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120

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Bi-and multistatic synthetic aperture radar (SAR) operates with distinct transmit and receive antennas which are mounted on separate platforms. Such a spatial separation has several operational advantages which will increase the capability, reliability and flexibility of future SAR missions. We will introduce various spaceborne bi-and multistatic SAR configurations and compare their potentials for different applications like frequent monitoring, wide swath imaging, scene classification, single-pass cross-track interferometry or resolution enhancement.

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Section: Frequent Monitoringmentioning

confidence: 99%

“…The middle plot of Fig. 2 shows an example of the results from the sensitivity analysis for an X-Band system with a ground resolution of 3 m (see also [17]). It becomes clear that the NESZ for the exemplary configuration defined by the inset will be in the order of19dB for targets in the neighborhood of the receiver nadir.…”

Section: Frequent Monitoringmentioning

confidence: 99%

Spaceborne bi- and multistatic SAR: potential and challenges

Krieger

Moreira

2006

IEE Proc., Radar Sonar Navig.

Self Cite

273

120

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“…Bistatic configuration in contrast to monostatic configuration uses separate transmitter and receiver which are located individually. At present, several models have been proposed by the researchers in system conceptualization for having bistatic data from air-born/space-born mission [17][18][19]. In future, it is planned to send TanDem-X by German Aerospace Centre (DLR) in association with Astrium GmbH which will be the second satellite in series of TerraSAR-X and will provide the bistatic data in X-band [20].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Soil Texture in Soil Moisture Retrieval for Specular Scattering at C-Band

Prakash¹,

Singh²,

Pathak³

2010

PIER

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Abstract-The objective of this paper is to analyze the behavior of specular scattering for different soil texture fields at various soil moisture (m v ) and analyze the data to retrieve the soil moisture with minimizing the effect of the soil texture. To study the soil texture effect on specular scattering 10 different soil fields were prepared on the basis of change in soil constituents (i.e., percentage of sand, silt and clay) and experiments were performed in both like polarizations (i.e., HH-polarization and V V -polarization) at various incidence angles (i.e., varying incidence angle from 25 • to 70 • in step of 5 • ). Angular response of specular scattering coefficients (σ • hh in HH-polarization and σ • vv in V V -polarization) were analyzed for different soil texture fields with varying soil moisture content whereas the surface roughness condition for all the observations were kept constant. The changes in specular scattering coefficient values were observed with the change in soil texture fields with moisture for both like polarizations. Further, copolarization ratio (P = σ • hh /σ • vv ) study was performed and it was observed that the dependency of copolarization ratio for change in soil texture field at constant soil moisture is less prominent whereas the value of copolarization ratio is varying with variation of moisture content. This emphasizes that copolarization ratio may be minimizing the effect of soil texture while observing the soil moisture on specular direction. Regression analysis is carried out to select the best suitable incidence angle for observing the moisture and texture at C-band in specular direction and 60 • incidence angle was found the best suitable incidence angle. An empirical relationship between P and m v was developed for the retrieval of m v and the obtained relationship gives a good agreement with observed m v . In addition, m v was also retrieved

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“…Assuming that there is one point target in the swath centre and the minimal slant range between the radar and the target is R 0 , the received azimuth signal [6] of the nth sub-antenna from the point target after demodulation is given by…”

Section: Received Azimuth Signals Of N Channelsmentioning

confidence: 99%

Azimuth ambiguity suppression with an improved reconstruction method based on antenna pattern for multichannel synthetic aperture radar systems

Wang

Deng

et al. 2015

IET Radar, Sonar & Navigation

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For synthetic aperture radar (SAR) systems, antenna array which is distributed in flight direction could increase the equivalent sample frequency in azimuth by a factor of the number of elements of antenna array. With a reconstruction algorithm, the aliased Doppler spectrum could be recovered. However, the degradation of conventional algorithms for reconstructing the Doppler spectrum with special pulse repetition frequency (PRF) shows poor robustness and the out-of-band energy which is caused by the side lobes of the antenna pattern deteriorates the azimuth ambiguity to signal ratio of a multichannel SAR. In this study, an improved reconstruction algorithm based on antenna pattern is proposed by generating an ambiguity matrix, which resembles the covariance matrix and could be used to reconstruct in-band signal and minimise the azimuth ambiguity energy. Aiming at increasing the robustness of the algorithm, the method of diagonal loading is introduced to the approach. Even in the scenario of special PRF, which is close to the singular point, the signal could be successfully reconstructed with the improved approach. Simulation results validate the proposed method.

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Analysis of system concepts for bi- and multi-static SAR missions

Cited by 57 publications

References 3 publications

Spaceborne bi- and multistatic SAR: potential and challenges

Spaceborne bi- and multistatic SAR: potential and challenges

The Effect of Soil Texture in Soil Moisture Retrieval for Specular Scattering at C-Band

Azimuth ambiguity suppression with an improved reconstruction method based on antenna pattern for multichannel synthetic aperture radar systems

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