Super wave beam forming method and system based on time modulation linear array
A linear array and time modulation technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of increasing space volume, increasing system cost, increasing system hardware overhead, etc.
Pending Publication Date: 2021-09-14
NANJING UNIV OF SCI & TECH
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For time-modulated arrays, the method of reducing the beam width is generally achieved by increasing the array aperture, which will increase the hardware overhead of the system, increase the cost of the system, and increase the space volume
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[0049] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0050] The method of the present invention is based on the time modulation array, first deriving the formula to obtain the superbeam array factor formula based on the time modulation array, and by performing Fourier series expansion on the array factor formula, the relationship between the switch time sequence and the beam amplitude and phase is obtained , using this relationship to calculate the switching time series of the two sub-arrays under the specified angle and weight, using two time...
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The invention discloses a super wave beam forming method and system based on a time modulation linear array. The method comprises the following steps: constructing array factors of a left sub-array and a right sub-array of the time modulation linear array; determining a complex weight of each array element in the left sub-array and the right sub-array according to a required beam pointing angle and a side lobe; determining the switching time of each array element in the left sub-array and the right sub-array according to the complex weight; enabling the left subarray and the right subarray to modulate according to the obtained switching time to generate wave beams, and extract wave beam harmonics to obtain left wave beams and right wave beams; performing sum-difference operation on the left and right beams to obtain sum and difference beams; and obtaining a super wave beam through the sum and difference wave beams. According to the invention, the harmonic wave beam generated by the time modulation array is effectively sharpened, the sidelobe level of the wave beam is reduced, and the super wave beam which is better than the traditional harmonic wave beam in performance is obtained.
Description
technical field [0001] The invention belongs to the field of array signal processing, and in particular relates to a super-beam forming method and system based on a time-modulated linear array. Background technique [0002] Super beamforming is a beamforming technology that uses sidelobe cancellation to reduce beam width and sidelobe level. It was first used in sonar detection, acoustic positioning and other fields. The performance of traditional beamforming methods such as least mean square algorithm and recursive least squares algorithm is quite different under different signal-to-noise ratios. By using super-beamforming technology, the signal-to-noise ratio can be improved, the beam can be sharpened, and the beam can be reduced. Peak sidelobe level. [0003] The time-modulated array is an array based on radio frequency switches. Compared with traditional arrays or phased arrays, it uses time as a control method and is more flexible. At present, time-modulated arrays hav...
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Login to View More IPC IPC(8): G01S7/52
CPCG01S7/52001
Inventor 廖晨马越陈春红杨国汪敏吴文王晶琦张若愚齐世山
Owner NANJING UNIV OF SCI & TECH