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Ka-band DBF-SAR real-time processing system and method

A DBF-SAR, DBF-SCORE technology, applied in radio wave measurement systems, radio wave reflection/re-radiation, climate sustainability, etc., can solve the problems of poor imaging quality and high false rate of non-uniform sampling signal imaging, Achieve the effect of improving the signal-to-noise ratio, reducing the size of the equipment, and high scalability

Pending Publication Date: 2022-05-24
SHANGHAI SATELLITE ENG INST
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Problems solved by technology

[0006] Patent document CN101702027A (application number: 200910216504.6) discloses a non-uniform spectrum reconstruction method for azimuth multi-beam synthetic aperture radar, which belongs to synthetic aperture radar signal processing technology, and solves the problem of high false rate of non-uniform sampling signal imaging and imaging poor quality problem

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  • Ka-band DBF-SAR real-time processing system and method
  • Ka-band DBF-SAR real-time processing system and method
  • Ka-band DBF-SAR real-time processing system and method

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Embodiment 1

[0042] A Ka-band DBF-SAR real-time processing system provided according to the present invention includes:

[0043] Data acquisition module: use different AD acquisition sub-boards to sample multi-channel IF signals and perform framing and buffering;

[0044] Digital processing module: digitally down-convert the buffered multi-channel intermediate frequency signal to obtain a multi-channel baseband signal, and perform filtering, extraction, and improved DBF-SCORE algorithm processing in turn, and multi-channel echo data synthesis;

[0045] The improved DBF-SCORE algorithm performs range-directed multi-channel DBF after channel equalization and pulse compression, thereby reducing the amount of data downlink.

[0046] Specifically, in the data acquisition module, different AD acquisition sub-boards are selected according to the number of antenna apertures to realize digital echo processing of N apertures, which has extremely high scalability.

[0047] Specifically, the data acq...

Embodiment 2

[0061] Embodiment 2 is a preferred example of Embodiment 1

[0062] The invention discloses a novel Ka-band DBF-SAR real-time processing system. The real-time processing system has the characteristics of miniaturization, light weight and strong expansibility.

[0063] Below in conjunction with accompanying drawing, the present invention is described in more detail:

[0064] like figure 1 As shown in the figure, the Ka-band DBF-SAR real-time processing system of the present invention has N apertures in the distance direction, and correspondingly N channels, uses one or part of the apertures in the middle to transmit a wide beam to illuminate a wide swath area, and each aperture receives independently, any The angle between the center of the receiving beam and the vertical direction at a moment is determined by the estimation of the echo direction.

[0065] like figure 2 As shown, the Ka-band DBF-SAR real-time processing system of the present invention firstly performs FFT t...

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Abstract

The invention provides a Ka-band DBF-SAR real-time processing system and method. The Ka-band DBF-SAR real-time processing system comprises: a data acquisition module, which uses different AD acquisition daughter boards to sample multi-channel intermediate frequency signals and performs framing and caching; the digital processing module is used for carrying out digital down-conversion on the cached multi-channel intermediate frequency signals to obtain multi-channel baseband signals, and sequentially carrying out filtering, extraction, improved DBF SCORE algorithm processing and multi-channel echo data synthesis; according to the improved DBF-SCORE algorithm, distance direction multi-channel DBF is carried out after channel equalization and pulse compression, and then the data downloading amount is reduced. The method has the advantages of real-time processing, multiple channels, high integration and the like, and is expected to play an important role in the millimeter wave SAR field.

Description

technical field [0001] The present invention relates to a radar real-time processing system, in particular, to a Ka-band DBF-SAR real-time processing system and method. Background technique [0002] SAR is a technology that obtains complex data of interference scene for imaging based on the principle of synthetic aperture. Traditional SAR transmits and receives electromagnetic waves with frequencies less than 10Ghz through a single antenna, and has been widely used in geographic mapping, wide-area detection and ocean monitoring. [0003] In order to achieve high-gain wide-field imaging, DBF-SAR using range-directed multi-channel simultaneous reception is difficult to achieve in low-frequency bands due to the limited antenna size, which is the fundamental reason why multi-channel SAR has not yet been applied on a large scale. [0004] When using the low-band SAR system to achieve multi-channel reception, in order to achieve the same bandwidth coverage as the Ka-band SAR mult...

Claims

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Application Information

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IPC IPC(8): G01S7/41G01S13/90
CPCG01S7/41G01S13/9023Y02A90/10
Inventor 王辉吴思利郑世超
Owner SHANGHAI SATELLITE ENG INST
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