Accurate compensation of stop-go approximation for high resolution spaceborne SAR using modified hyperbolic range equation

Kuang, Hao; Chen, Jie; Yang, Wei; Zhu, Yanqing; Zhou, Jian; Li, Chunsheng

doi:10.1109/igarss.2014.6946459

Cited by 2 publications

(3 citation statements)

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“…Due to the large squint angle and large propagation delay of the proposed GEO SAR, the radial velocity becomes larger, and the slant range changes faster. Thus, the assumption of stop-and-go gets invalid, which causes two effects [14]- [18]. One is the slow-time effect, which makes accurate calculation of two-way slant range difficult.…”

Section: Introductionmentioning

confidence: 99%

“…References [16] and [17] take these two effects into account in airborne SAR geometry, where both the orbit bending and the Earth rotation are ignored. References [14], [15], [18], and [22] research in spaceborne SAR geometry. In [14], an ''equivalent position'' model is proposed to deal with the slow-time effect.…”

Section: Introductionmentioning

confidence: 99%

“…In [15], the linear terms in azimuth frequency domain are compensated for fast-time effect, but the complete formation is not established and the effects of higher order terms cannot be revealed. In [18], a complete formation for compensation is carefully established, which is based on a modified hyperbolic rang equation (MHRE). MHRE approximates to the cubic terms of actual slant range precisely, but the quartic error cannot be ignored as the synthetic aperture time is very long in GEO SAR.…”

Section: Introductionmentioning

confidence: 99%

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A New Geosynchronous SAR Constellation and its Signal Characteristics

Huang

Qiu

et al. 2019

IEEE Access

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The Geosynchronous Synthetic Aperture Radar (GEO SAR) has a long synthetic aperture time. The temporal decoherence and azimuth variance characteristics of echo are significant, that brings great challenges to signal to process. In order to reduce the synthetic aperture time and thus improve the observation flexibility and efficiency, this paper proposes a SAR system mounted on a special satellite in reverse equatorial geosynchronous orbit, so-called the reverse equatorial GEO SAR. The orbit is nearly circular and the orbital plane coincides with the equatorial plane. The satellite flies against the direction of the Earth's rotation. The relative velocity is accelerated twice and the synthetic aperture time is shorter. The satellite does not drift in latitude direction and drifts uniformly in longitude direction. The echo has azimuth invariance property. Meanwhile, the 24-hour continuous observation can be achieved for areas with a certain range of latitude by means of large squint technique and constellation design. As the GEO SAR has high orbit, large delay, large squint angle, and wide pulse width, the complex modulation effects are generated by continuous motion between the satellite and target during the imaging period. In this paper, the uniform acceleration curve motion is used to describe the motion of both satellite and target, and the linear approximation is used to describe the slant range change in the process of transmitting and receiving one pulse. Accordingly, an accurate signal model for the reverse equatorial GEO SAR is established, which provides a theoretical model for signal characteristics analysis and imaging algorithms development.

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Section: Introductionmentioning

confidence: 99%