A wideband array antenna compression sampling method and device
An array antenna and compressive sampling technology, applied in the field of broadband array antenna compressive sampling method and device, can solve the problem that the sparse characteristics of broadband array signals cannot be fully utilized and the like
Active Publication Date: 2017-08-04
SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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Problems solved by technology
In the field of array antennas, the signal has its unique space-frequency joint sparse characteristics. If the above two methods are directly applied, it will not be able to make full use of the sparse characteristics of broadband array signals.
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[0015] Describe the present invention below in conjunction with specific embodiment: present embodiment implements under the premise of technical method of the present invention, provides detailed implementation, but protection scope of the present invention is not limited to following embodiment.
[0016] This implementation example is a uniform linear antenna array with 20 elements, and the distance between the elements is 0.15m. It is necessary to complete the compressed sampling and recovery of 0-1GHz signals from different directions. The sampling rate of the analog-to-digital converter is 110MHz.
[0017] The adopted device includes an analog part and a digital processing part, and the analog part is divided into several groups of broadband modulators, and each group of broadband modulators is composed of a broadband periodic signal generator, an analog multiplier, a low-pass filter and an analog-to-digital converter.
[0018] Each array element in the array antenna is fo...
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The present invention proposes a wideband array antenna compression sampling method and device. The signal received by each array element in the array antenna is divided into two paths, one path is multiplied with the periodic broadband analog signal to obtain a broadband modulation signal, and the other path is multiplied with the delayed The periodic broadband analog signal is multiplied to obtain the delayed broadband modulation signal; the broadband modulation signal and the delayed broadband modulation signal are respectively subjected to low-pass filtering and analog-to-digital conversion to obtain a digital sampling signal and a delayed digital sampling signal; the digital sampling signal output by all array elements The signal forms an output signal of a virtual antenna line array, and the delayed digital sampling signals output by all array elements form another output signal of a virtual antenna line array; for two sets of output signals, the direction finding of the array antenna is used to obtain the received signal of the array antenna in the air domain and frequency domain The distribution status of the distribution, and further use the beamforming algorithm to obtain the signal output of each frequency band in each direction of the space. The invention effectively reduces the sampling rate of the signal and completes the restoration of the signal without distortion.
Description
technical field [0001] The invention belongs to the technical field of antenna array signal processing and compressed sensing technology, and specifically relates to a wideband array antenna compression sampling method and device. Background technique [0002] If it is necessary to restore the analog signal without distortion, according to the Nyquist theorem, the sampling rate cannot be lower than twice the signal bandwidth. With the development of technology, the bandwidth of analog signals has increased dramatically, and the consequent increase in Nyquist sampling rate has brought great pressure to the analog-to-digital converter. The compressed sensing theory provides a theoretical basis for us to break through the limitations of the Nyquist theorem and to sample at a sampling rate much lower than the Nyquist frequency. The theory points out that if the signal is sparse in a certain space, the signal can be transformed into a low-dimensional space through linear change,...
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IPC IPC(8): H03M7/40
Inventor 易舟维
Owner SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP