The bistatic SAR experiment with ALOS / PALSAR and Pi-SAR-L

Fujimura, Tsutomu; Totsuka, Hideharu; Imai, Norihiro; Matsuo, Shoichiro; Kimura, Tomoki; Ishii, Tomoko; Oura, Yoshitaka; Shimada, Masanobu

doi:10.1109/igarss.2011.6050162

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…Near-space passive SARs are considered as a typical unit with asymmetric structure in the future sensor web [3] because the altitude and velocity of a near-space vehicle is very different from those of a satellite. Spaceborne/airborne hybrid bistatic SAR [4][5][6][7], whose transmitter is spaceborne and receiver is placed on an aircraft, has a resemblance to a near-space passive SAR. However, the latter has two advantages over the former, that is, (1) wider imaging swaths introduced by the greater flying altitude of a receiver platform and (2) greater flexibility induced by the variability of the velocity of a receiver platform, ranging from approximately 5 to 3000 meters per second.…”

Section: Introductionmentioning

confidence: 99%

A Wide-Beam Scanning Mode for Near-Space Passive SARs

Zhou

Ren

Dai

2012

International Journal of Antennas and Propagation

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A near-space passive SAR consists of a passive radar receiver placed on a near-space vehicle and another existing radar on a satellite serving as an illuminator. In this paper, we present a wide-beam scanning mode for near-space passive SARs for the purpose of increasing the azimuth scene extension. The receiving distance of a near-space SAR is much shorter than that of a satellite-based SAR, and the synthetic aperture time for a near-space passive SAR is not longer than the time interval during which a target transverses the azimuth beam of a transmitter. We design our novel mode by spreading the azimuth beam of a receiver to match the azimuth footprint of the transmitter. We also synchronize the azimuth beam of the receiver with that of the satellite within seconds during the beam scanning to further increase the scene extension. Furthermore, we formulate the azimuth scene extension and the footprint overlapping time for near-space passive SARs in terms of the possible locations of the involved satellites and receivers. Experimental simulations demonstrate the effectiveness of our proposed mode, especially revealing that the wide-beam scanning mode improves the azimuth scene extension and footprint overlapping time over the wide-beam mode, without decreasing azimuth resolution.

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Section: Introductionmentioning

confidence: 99%

A Wide-Beam Scanning Mode for Near-Space Passive SARs

Zhou

Ren

Dai

2012

International Journal of Antennas and Propagation

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“…The only requirement is that at least one platform should move relative to an observation area, such that a synthetic aperture can be formed. The spaceborne platform can be a radar satellite [6][7][8], which is the most common case. Alternatively, it can be a transmitter of opportunity, such as a communications or digital television satellite.…”

Section: Introductionmentioning

confidence: 99%

GNSS-based bistatic SAR: a signal processing view

Antoniou

Cherniakov

2013

EURASIP J. Adv. Signal Process.

121

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This article presents signal processing algorithms used as a new remote sensing tool, that is passive bistatic SAR with navigation satellites (e.g. GPS, GLONASS or Galileo) as transmitters of opportunity. Signal synchronisation and image formation algorithms are described for two system variants: one where the receiver is moving and one where it is fixed on the ground. The applicability and functionality of the algorithms described is demonstrated through experimental imagery that ultimately confirms the feasibility of the overall technology.

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