Bistatic FMCW Sar Raw Signal Simulator for Extended Scenes

Liu, Yue; Deng, Yunkai; Wang, Robert; Jia, Xiaoxue

doi:10.2528/pier12041604

Cited by 8 publications

(5 citation statements)

References 32 publications

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“…Third, to minimize the sidelobe level, the intensity and power (energy) of the side lobes should be considered. Therefore, besides the peak sidelobe level (PSL), we also introduce the integrated sidelobe level (ISL) as did in synthetic aperture radar (SAR) image assessment [20,21] where ISL is used to assess how much energy of an imaged target leaks to the sidelobe region. Based on the above description, the minimum sidelobe level design criteria in transmit beampattern synthesis for MIMO radar can be stated as follows:…”

Section: Design Criteriamentioning

confidence: 99%

Mimo Radar Transmit Beampattern Synthesis via Minimizing Sidelobe Level

Xu¹,

Wang²,

Yuan³

et al. 2013

PIER B

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Abstract-In multi-input multi-output (MIMO) radar transmit beampattern synthesis, most current literature formulates the problems in steradian space. However, since the beampattern and its parameters are both measured and defined in radian space, from the view point of physical meaning, it will be better to reformulate the problems in radian space rather than in steradian space. In this paper, we propose methods in the radian space to synthesize beampatterns based on minimizing sidelobe level for the two main designs in MIMO radar, i.e., minimum sidelobe beampattern design (MSBD) and beampattern matching design (BMD). For MSBD, the design criteria considering both peak sidelobe level and integrated sidelobe level is proposed. By this we can have a good tradeoff between the intensity and power distribution in beampattern synthesis. After a two-step converting, the formulation of the criteria is transformed into a convex programming, where a global optimal solution can be obtained. For BMD, instead of minimizing mean square error directly as in conventional methods, we propose a power-approximation-based method by minimizing integrated sidelobe level. Finally, numerical comparisons with classical methods demonstrate that the proposed MSBD maintains for all range of main lobe width and the proposed BMD has smoother main lobes with maximal power focused in.

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Section: Design Criteriamentioning

confidence: 99%

Mimo Radar Transmit Beampattern Synthesis via Minimizing Sidelobe Level

Xu¹,

Wang²,

Yuan³

et al. 2013

PIER B

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“…Over the last few years, the BSAR synchronization and imaging technology have been studied well [1][2][3][4][5][6]. Several experiments with different topologies have been conducted, and a number of valuable results have been published [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Bistatic Interferometer Based on Spaceborne Sar

Zhang¹,

Chang²

2013

PIER

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Abstract-This paper presents the performance analysis of Bistatic Interferometer BAsed on Spaceborne SAR (BIBASS). As a bistatic system with general configuration, the system response of BIBASS is azimuth/range dependent. Taking into account this peculiarity, the appropriate theoretical framework is developed to make a more accurate evaluation of the performance of BIBASS. Firstly, the interferometric features are studied. Then, considering all kinds of de-correlation factors, a comprehensive investigation of coherence of such a system is conducted, followed by the relative height accuracy analysis. The theoretical analysis and simulation show that BIBASS, with the ability of high-precision height measurement, can be widely applied as a novel remote sensing measurement system.

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“…In this figure, τ is the pulse width, τ p is the time interval from the end of transmitted pulse to the open time of echo window, 1/prf 0 is the pulse repetition period for constant PRF, 1/prf k is the pulse repetition period corresponding to the kth change of variable PRF. It is known that echoes corresponding to the transmitted pulse can be received at least one pulse period [28,29]. So it is supposed that every echo passes one pulse period before it is received.…”

Section: The Imaging Principle Of Variable Prf Sarmentioning

confidence: 99%

A Variable PRF Imaging Method for High Squint Diving Sar

Xu¹,

Gao²,

Li³

2013

PIER

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Abstract-The high squint diving SAR is widely used to provide the information in advance. Large squint angle deduces the deeper coupling of range and azimuth of SAR echoes which makes SAR imaging more difficult. Especially, the large range migration of the deep couple heavily burdens the imaging processing time and storage units. The diving motion of platform worsens the situation. This paper proposes the varied azimuth sample frequency (Pulse Repeat Frequency, PRF) to implement the high squint diving SAR imaging. Based on the signal model of the diving squint SAR, it is analyzed that the range walk is the prominent component of range migration in the high squint SAR. The varied PRF imaging method dramatically decreases the range walk of echoes by shifting the beginning position of transmitted pulses and received echoes and the shift is implemented by the PRF variation. Then the range migration is decreased and the couple of range and azimuth of SAR echoes is reduced. The PRF variation law is deduced and the applicable condition of varied PRF is presented. The simulation results show that the variable PRF method is efficient to reduce range walk of echoes. Comparison to the traditional constant PRF, the novel variable PRF method for high squint needs less storage and less time expense, which is helpful to real time SAR imaging. The non-uniform FFT can be used for the azimuth compressing of the variable PRF SAR. It will simplify the implementation of the variable PRF SAR imaging.

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Bistatic FMCW Sar Raw Signal Simulator for Extended Scenes

Cited by 8 publications

References 32 publications

Mimo Radar Transmit Beampattern Synthesis via Minimizing Sidelobe Level

Mimo Radar Transmit Beampattern Synthesis via Minimizing Sidelobe Level

Performance Analysis of Bistatic Interferometer Based on Spaceborne Sar

A Variable PRF Imaging Method for High Squint Diving Sar

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