Sub-band splicing method based on internal calibration data

An internal calibration and sub-band technology, which is applied in the field of signal processing, can solve problems such as time delay, different amplitude and phase errors, and the influence of splicing effects, and achieve the effect of reducing the influence of noise and good robustness

Inactive Publication Date: 2015-05-20
BEIHANG UNIV
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Problems solved by technology

However, in actual engineering, each sub-band receiver will have different amplitude and phase errors, and according to the frequency modulation characteristics of the chirp signal, there will be certain differences between sub-band signals received by d...

Method used

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  • Sub-band splicing method based on internal calibration data
  • Sub-band splicing method based on internal calibration data

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Embodiment

[0083] Embodiment: Utilize the method of the present invention to process a set of three-subband splicing SAR airborne data, and the radar parameters are shown in Table 1.

[0084] Table 1 Radar parameters

[0085]

[0086] Step 1: Read in the calibration data within a frame of the single sub-band, and extract the intra-band error and the time delay between channels through the calibration data within the frame of the single sub-band. The specific steps are divided into:

[0087] A. Read the calibration data in the kth sub-band. For the convenience of fast Fourier transform, the time-domain signal is zero-filled, and the original time-domain signal is zero-filled at the end, so that the total number of points is the power of 2. Here, When the center frequency of the kth sub-band signal is f c (k), the sampling rate is f s , the number of signal points is ns. Perform fast Fourier transform (FFT) to the frequency domain on the single subband signal, and perform matched fi...

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Abstract

The invention discloses a sub-band splicing method based on internal calibration data. The sub-band splicing method comprises the following steps: step I: extracting in-band errors and time delay between channels; step II: processing amplitude errors and time delay extracted by an internal calibration signal in each sub-band; step III: shifting internal calibration compression positions of different sub-bands to a zero moment, and processing phase errors of each sub-band; step IV: reading radar echo data of sub-bands, and performing in-band error compensation of a single sub-band; step V: compensating in-band errors of each sub-band signal, and calculating time delay of each sub-band; step VI: performing upsampling on a frequency domain signal of each sub-band in the step V in a tail zero-filling mode; step VII: performing splicing process in a frequency domain; step VIII: obtaining a spliced time domain signal. The sub-band splicing method disclosed by the invention not only can compensate amplitude phase errors in the sub-bands, but also can compensate amplitude phase errors among the sub-bands as well as time delay among different sub-bands, and realizes coherent fusion processing of different sub-band signals.

Description

technical field [0001] The invention belongs to the field of signal processing and relates to a subband splicing method, in particular to a synthetic aperture radar subband splicing method based on internal calibration data. Background technique [0002] Synthetic Aperture Radar (SAR) satellites have developed rapidly in recent years. Since SAR satellites are not limited by factors such as weather, geography, and time, they can observe the earth all day long and have certain penetrating power, so they are widely used. It is used in military reconnaissance, topographic mapping, resource detection, ocean observation, ecological monitoring, natural disaster monitoring, rapid rescue, etc. [0003] High resolution is the eternal pursuit of synthetic aperture radar. The higher the resolution of SAR imaging, the better the understanding of the scattering characteristics of the target, the more sufficient the information of the imaging area is obtained, and the more accurate the pe...

Claims

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 王鹏波李谨成陈杰门志荣杨威
Owner BEIHANG UNIV
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