SAR focusing: scaled inverse Fourier transformation and chirp scaling

Loffeld, Otmar; Hein, Achim; Schneider, Falco

doi:10.1109/igarss.1998.699533

Cited by 12 publications

(11 citation statements)

References 4 publications

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“…For convenience, we ignore the first three terms in (19) which do not affect the focusing steps in the following and define R 1 (·) and R 2 (·) as the functions of closest slant ranges. For example, R 1 (τ R0 , R R0 ) and R 2 (R T0 , R R0 ) are given as…”

Section: Processing Approachmentioning

confidence: 99%

Spaceborne/airborne bistatic synthetic aperture radar focusing on an analytical bistatic point target reference spectrum

Song

Deng

et al. 2013

IET Radar, Sonar & Navigation

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An analytical bistatic point target reference spectrum (BPTRS) is proposed. The BPTRS is derived from the one-to-one relationship between slow time and Doppler frequency with no Taylor series expansions. Based on the BPTRS, a twodimensional frequency-domain focusing algorithm for spaceborne/airborne bistatic synthetic aperture radar is developed. The algorithm exploits a range-dependent sub-blocks processing method to perform range cell migration correction and quadratic Doppler term compensation, and then a scaled inverse Fourier transformation and a sinc interpolation are used to correct the geometric distortions in azimuth and range, respectively. Some simulation experiments are also presented to verify their performance.

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Section: Processing Approachmentioning

confidence: 99%

Spaceborne/airborne bistatic synthetic aperture radar focusing on an analytical bistatic point target reference spectrum

Song

Deng

et al. 2013

IET Radar, Sonar & Navigation

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“…The principle of ISFT is shown below [41]. As shown in Figure 5, assuming s(t)↔S(f ) is a Fourier transform pair, if the input frequency-domain signal is S(a · f), after ISFT implementation, the output time-domain signal will be 1 a j j ⋅s t ð Þ.…”

Section: Principle Of Isftmentioning

confidence: 99%

“…As shown in Figure 5, assuming s(t)↔S(f ) is a Fourier transform pair, if the input frequency-domain signal is S(a · f), after ISFT implementation, the output time-domain signal will be 1 a j j ⋅s t ð Þ. The digital implementation of ISFT can be found in [42].…”

Section: Principle Of Isftmentioning

confidence: 99%

“…The inverse scaled Fourier transform, abbreviated as ISFT, was introduced to focus monostatic SAR data in [41] and was compared with chirp scaling method in [42]. The ISFT was also applied for bistatic SAR data imaging [32,40].…”

Section: Principle Of Isftmentioning

confidence: 99%

“…The 2-D spectrum of a complete scene data can be obtained by integrating the BPTRS over all the point target spectra [41,42]:…”

Section: Derivation Of 2-d Spectrum Of the Scene Datamentioning

confidence: 99%

See 2 more Smart Citations

An integrative synchronization and imaging approach for bistatic spaceborne/stratospheric SAR with a fixed receiver

Zhang

Chang

2013

EURASIP J. Adv. Signal Process.

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Bistatic spaceborne/stratospheric synthetic aperture radar (SAR) with a fixed receiver is a novel hybrid bistatic SAR system, in which a spaceborne SAR serves as the transmitter of opportunity, while a fixed receiver is mounted on a stratospheric platform. This paper presents an integrative synchronization and imaging approach for this particular system. Firstly, a novel synchronization method using the direct-path signal, which can be collected by a dedicated antenna, is proposed and applied. The synchronization error can be completely removed using the proposed method. However, as the cost of synchronization, the characteristic of synchronized echo's range history becomes quite different from that of general bistatic SAR data. To focus this particular synchronized data, its 2-D spectrum is derived under linear approximations and then a frequency-domain imaging algorithm using two-dimensional inverse scaled Fourier transform (2-DISFT) is proposed. At last, the proposed integrative synchronization and imaging algorithm is verified by simulations.

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Using omega‐ K algorithm for bistatic synthetic aperture radar image formation based on modified extended Loffeld's bistatic formula

Zamani¹,

Modarres-Hashemi²

2013

IET Radar, Sonar & Navigation

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SAR focusing: scaled inverse Fourier transformation and chirp scaling

Cited by 12 publications

References 4 publications

Spaceborne/airborne bistatic synthetic aperture radar focusing on an analytical bistatic point target reference spectrum

Spaceborne/airborne bistatic synthetic aperture radar focusing on an analytical bistatic point target reference spectrum

An integrative synchronization and imaging approach for bistatic spaceborne/stratospheric SAR with a fixed receiver

Using omega‐ K algorithm for bistatic synthetic aperture radar image formation based on modified extended Loffeld's bistatic formula

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