Satellite-borne SAR real-time digital beam forming method
A real-time digital and beam technology, which is used in radio wave measurement systems, radio wave reflection/re-radiation, satellite radio beacon positioning systems, etc. and other problems, to achieve the effect of improving stability and versatility, improving engineering achievability, and low consumption of digital resources
Active Publication Date: 2021-07-27
AEROSPACE INFORMATION RES INST CAS
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Most of the existing theoretical schemes default that the weights are stored in satellite devices in advance. However, there is a contradiction between the limited storage resources of satellites and the massive weights. In addition, satellites cannot always be established with ground stations. Reliable communication, the real-time performance of pre-stored weights cannot be guaranteed, which limits the development and application of DBF technology
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[0034] This disclosure provides a spaceborne SAR real-time digital beamforming method, which can obtain high-performance weights required by a large number of DBFs in real time at a relatively low cost, and solves the problem of real-time DBF in spaceborne SAR for the next generation of high-resolution and wide-width systems. Deals with engineering realizable issues.
[0035] In the process of realizing the present disclosure, the inventors found that there are mainly two real-time computing architectures for pitching DBF-SAR at present, one of which is for the total channel number of N (N is a positive integer, subject to the specific system design) The data of each channel in the multi-pass is digitally down-converted and then the real-time weighted summation is completed in the baseband. For example, assuming that channel 1 is the reference channel, the time-varying weighting coefficient of any channel, such as the nth (1≤n≤N) channel It can be expressed as:
[0036]
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The invention provides a satellite-borne SAR real-time digital beam forming method. The method comprises the following steps: acquiring auxiliary parameters required by real-time digital beam forming; obtaining error compensation parameters of each channel, encoding and packaging the error compensation parameters and the auxiliary parameters into an instruction packet, and uploading the instruction packet to a satellite-borne FPGA; creating a weight generator so as to calculate a weight coefficient required by real-time digital beam forming; and performing real-time processing on multi-channel echo sampling data based on the weight coefficient to complete digital beam forming output. According to the method, a large number of high-performance weights can be obtained by calculating a small number of low-order linear polynomials in real time; while DBF real-time processing is carried out, multi-channel amplitude and phase errors are corrected, so that the requirements of a system on two aspects of a high-gain receiving function and high robustness can be met; the consumption of digital resources is relatively low, the engineering realizability of the DBF-SAR is greatly improved, and the stability and universality of the system are improved at the same time.
Description
technical field [0001] The present disclosure relates to the technical field of spaceborne synthetic aperture radar / data processing, and in particular to a spaceborne SAR real-time digital beamforming method. Background technique [0002] The next-generation synthetic aperture radar (Synthetic Aperture Radar, SAR) requires high-resolution and wide-ranging earth observation capabilities, among which the digital beamforming (DBF) technology in elevation can provide key technical support. [0003] At present, the main DBF method is as follows: firstly, the multi-channel analog signal is received through the front end of the system, and then the signal is converted into a digital signal through an analog-to-digital converter (ADC), and weighted in FPGA in real time. and to complete digital beamforming. Most of the existing theoretical schemes default that the weights are stored in satellite devices in advance. However, there is a contradiction between the limited storage resour...
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IPC IPC(8): G01S13/90G01S7/40G01S19/12
CPCG01S13/9021G01S7/4004G01S19/12
Inventor 邱劲松张志敏陈圳邓云凯王宇王伟
Owner AEROSPACE INFORMATION RES INST CAS