Single frequency network external radiation source radar image method based on OFDM waveform
A technology of external radiation source radar and imaging method, which is applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, image communication, etc., can solve the problems of large coherent accumulation angle, difficult to meet, insufficient image distance resolution, etc.
Active Publication Date: 2015-09-23
WUHAN UNIV
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Problems solved by technology
In the bistatic configuration, since the commonly used external radiation source is generally a commercial radio or television transmission signal, its bandwidth is relatively narrow, resulting in a serious shortage of image distance resolution
Secondly, the working frequency band of the external radiation source radar is low, and a larger coherent integration angle is required for azimuth resolution, which is usually difficult to meet in practical applications
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[0052] The present invention will be further described below with specific embodiments in conjunction with the accompanying drawings.
[0053] figure 1 It is a structural diagram of an OFDM signal in an embodiment of the present invention. Let the transmitted i-th OFDM multi-carrier signal be in the form of:
[0054] s i ( t ) = Σ n = 0 N - 1 d n exp ( j 2 π n Δ f t ) ,
[0055] Where N is the number of subcarriers, t represents time, and d n is the data symbol assigned to each sub-channel, Δf is the frequency interval between adjacent sub-carriers, and satisfies ...
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The invention discloses a single frequency network external radiation source radar image method based on OFDM waveforms. The OFDM waveforms can be used for tomographic imaging each subcarrier since orthogonality exists among the subcarriers, thereby the utilization of frequency diversity provided by the OFDM can be maximized. Emission stations in an SFN (Single Frequency Network) irradiate a target from different angles, and echo samples can be greatly expanded in a coverage area of a wavenumber domain, thereby significantly improving the imaging performance. According to the single frequency network external radiation source radar image method provided by the invention, each subcarrier is demodulated at first, then each subcarrier is subjected to tomographic imaging, and imaging results of all subcarriers are subjected to coherent integration so as to obtain a single bistatic target image; and finally, all the single bistatic target images are integrated to obtain a final high-resolution target image. The single frequency network external radiation source radar image method provided by the invention fully utilizes the multi-carrier structure and the single frequency network of the modern broadcasting television signals, and has the advantages of being high in imaging resolution, saving spectrum resource, saving hardware and the like.
Description
technical field [0001] The invention belongs to the technical field of external radiation source radar target detection, and in particular relates to an external radiation source radar imaging method based on an OFDM waveform-based single frequency network digital broadcasting television signal. Background technique [0002] External radiation source radar is a bistatic / multistatic radar system that uses electromagnetic signals emitted by a third party for target detection. Because of its low development and maintenance costs, anti-stealth, and strong anti-destruction capabilities, it has gradually attracted people's attention in recent years and has become the research focus of new system radars. A variety of principle verification systems have been successfully developed at home and abroad, a large amount of measured data has been obtained, and breakthroughs have been made in the basic theory and key technologies of external radiation source radar. In Wan Xianrong's paper...
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IPC IPC(8): G01S13/89G01S13/00G01S7/42H04N21/2383
CPCG01S7/42G01S13/003G01S13/89H04N21/2383
Inventor 万显荣夏鹏易建新
Owner WUHAN UNIV