Analytical Geometrical Determination of BSAR Resolution

Lazarov, Andon; Kostadinov, Todor

doi:10.1002/9781118863473.ch5

Cited by 2 publications

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“…The bistatic range resolution is always poorer than that of monostatic case [14], and converges to the monostatic case if = 0 or at far range where B/r becomes negligibly small, as shown in Figure 2. Note that this degraded range resolution effect of the bistatic configuration occurs at the very near range only and becomes less than 103% of a monostatic case at a range of R=2 m with = 1 m. This effect would be negligible for airborne and satellite SAR operations when B/r is relatively small.…”

Section: Bistatic Gb-sar Systemmentioning

confidence: 78%

Analysis of a Bistatic Ground-Based Synthetic Aperture Radar System and Indoor Experiments

Lee

Moon

2020

Remote Sensing

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Recent advancement of satellite synthetic aperture radar (SAR) techniques require more sophisticated system configurations such as the use of bistatic antennas or multi-frequencies. A ground-based experiment is a cost-effective and efficient way to evaluate those new configurations especially in the early stage of the system development. In this paper, a ground-based synthetic aperture radar (GB-SAR) system was constructed and operated in a bistatic mode at Ku-band where a receiving antenna (Rx) follows a transmitting antenna (Tx) separated by a baseline B. A new bistatic GB-SAR focusing algorithm was developed by modifying a conventional range-Doppler algorithm (RDA), and its performance has been evaluated by comparing the results with those from a back-projection algorithm (BPA). The results showed good performance of RDA at far range approaching nominal resolutions of 9.4 cm in range and 4.5 cm in azimuth, but limited quality at near range due to the approximation used in RDA. Signals from three trihedral corner reflectors (CR) reduced with increasing B, showing a typical bidirectional scattering behavior of CR. This GB-SAR system will be a testbed for new SAR imaging configurations with variations in antenna positions and target properties.

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Section: Bistatic Gb-sar Systemmentioning

confidence: 78%

Analysis of a Bistatic Ground-Based Synthetic Aperture Radar System and Indoor Experiments

Lee

Moon

2020

Remote Sensing

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“…Conceptualization of next generation of synthetic aperture radar (SAR) often includes the use of multiple satellites for transmitting and/or receiving antennas to increase the system performance in resolution, image swath, signal-to-noise ratio, and repeated coverage [1][2][3][4][5][6][7]. One can use a satellite/airborne SAR system as a transmitter and set up multiple stationary receivers on the ground to image the surface with limited swath.…”

Section: Introductionmentioning

confidence: 99%

Indoor Experiments of Bistatic/Multistatic GB-SAR with One-Stationary and One-Moving Antennae

Lee

Moon

2021

Remote Sensing

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Ground-based synthetic aperture radar (GB-SAR) is a useful tool to simulate advanced SAR systems with its flexibility on RF system and SAR configuration. This paper reports an indoor experiment of bistatic/multistatic GB-SAR operated in Ku-band with two antennae: one antenna was stationary on the ground and the other was moving along a linear rail. Multiple bistatic GB-SAR images were taken with various stationary antenna positions, and then averaged to simulate a multistatic GB-SAR configuration composed of a moving Tx antenna along a rail and multiple stationary Rx antennae with various viewing angles. This configuration simulates the use of a spaceborne/airborne SAR system as a transmitting antenna and multiple ground-based stationary antennae as receiving antennae to obtain omni-directional scattering images. This SAR geometry with one-stationary and one-moving antennae configuration was analyzed and a time-domain SAR focusing algorithm was adjusted to this geometry. Being stationary for one antenna, the Doppler rate was analyzed to be half of the monostatic case, and the azimuth resolution was doubled. Image quality was enhanced by identifying and reducing azimuth ambiguity. By averaging multiple bistatic images from various stationary antenna positions, a multistatic GB-SAR image was achieved to have better image swath and reduced speckle noise.

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Analytical Geometrical Determination of BSAR Resolution

Cited by 2 publications

References 0 publications

Analysis of a Bistatic Ground-Based Synthetic Aperture Radar System and Indoor Experiments

Analysis of a Bistatic Ground-Based Synthetic Aperture Radar System and Indoor Experiments

Indoor Experiments of Bistatic/Multistatic GB-SAR with One-Stationary and One-Moving Antennae

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