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Overlapped spectrum based low-order phase error estimation method

A phase error estimation and phase error technology, applied in the field of synthetic aperture radar imaging, can solve difficult problems such as SAR systems

Inactive Publication Date: 2013-09-18
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

These approaches are difficult to apply to general frequency-stepped SAR systems because they are only valid for specific system parameters

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  • Overlapped spectrum based low-order phase error estimation method
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Embodiment Construction

[0033] In order to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] This method of low-order phase error estimation based on overlapping spectra, such as image 3 , the specific steps include:

[0035] Step 1. Take the echo signals of two adjacent frequency points that need to estimate the low-order phase error, and perform range matching filtering respectively. The obtained first frequency point signal and second frequency point signal are respectively

[0036] x 11 (t)=sinc(B(t+t min +Δt 1 -t d ))·exp(-j2πf c t d )

[0037] x 21 (t)=sinc(B(t+t min +Δt 1 +Δt 2 -t d )) (1)

[0038] ·exp(-j2π(f c +Δf)t d )·exp(jΔΦ 0 )

[0039] Among them, sinc means B is the emission pulse bandwidth, t is the fast time axis, t min is the initial sampling time of the system, Δt 1 is the initial sampling ti...

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Abstract

The invention discloses an overlapped spectrum based low-order phase error estimation method. The method includes taking echo signals of two adjacent frequency points needing low-order phase error estimation, respectively performing distance-direction matched filtering on the echo signals, then multiplying by linear phases prior to Fourier transformation, and finally acquiring phase errors to perform compensation. According to the method, the low-order phase errors between the adjacent frequency points are estimated and then compensated, so that the purpose for inhibiting grating lobes can be achieved.

Description

technical field [0001] The invention belongs to the technical field of synthetic aperture radar imaging, and relates to a method for estimating low-order phase errors based on overlapping spectrums in a frequency-stepping SAR system. Background technique [0002] Synthetic Aperture Radar (SAR) has developed rapidly in recent years. For example, the resolution of the PAMIR system and MiniSAR system has reached 0.1 meters, and centimeter-level ultra-high resolution SAR will also be realized in the near future. The range resolution of SAR depends on the transmitted signal bandwidth. For example, a signal bandwidth of 1.5 GHz is required to achieve a range resolution of 0.1 m. It is very difficult for a radar system to generate a signal with such a large bandwidth, and it is also a very big challenge for AD sampling. [0003] A well-known technique for obtaining high range resolution is the frequency stepping technique. A SAR using this technique transmits a set of narrowban...

Claims

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Application Information

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IPC IPC(8): G01S7/36G01S13/90
Inventor 丁泽刚姚迪龙腾朱动林李英贺高文斌
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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