System and method for forming digital wave beams of two-dimensional digital array radar

Abstract

The invention discloses a system and a method for forming digital wave beams of a two-dimensional digital array radar, which mainly solves the problems of limited data transmission and arithmetic amount, small scale of the system and inflexible control of the wave beams in the prior art. The system of the invention comprises a two-dimensional rectangular digital array antenna of M*N array elements, a digital signal processing (DSP) device, a field programmable gate array (FPGA) device and peripheral accessory devices. The method for forming the digital wave beams comprises the following steps: the FPGA device receives the frequency, azimuth angle and pitch angle information of received wave beams transmitted by the two-dimensional digital array; and the DSP calculates the sum, the difference, and the row and column wave beam weights of the two-dimensional digital array according to the information received by the FPGA, and the weights are transmitted to the FPGA device; and the FPGA device utilizes the weights and a target echo signal transmitted by optical fibers to form the sum, the difference, and the row and column wave beams of the two-dimensional digital array in the FPGA device. The invention has the advantages of large data transmission quantity and scale of the system, mass amount of the wave beams, flexible scanning of the wave beams and strong instantaneity, and is suitable for forming the digital wave beams of a large-scale two-dimensional array radar.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and relates to digital beam forming DBF, specifically, a method of applying FPGA and DSP to perform real-time sum, difference, row, and column multi-beam formation of array wide and narrow pulses under the requirements of system timing, which can be used for two Dimensional large digital array radar to obtain excellent beam performance. Background technique [0002] In order to adapt to the increasingly severe target environment and highly confrontational electromagnetic environment, the performance of the radar must be greatly improved, that is, it must have high precision, multi-functional multi-target detection, anti-jamming, multiple self-adaptation and target recognition capabilities. With the development of direct digital frequency synthesis technology DDS, analog-to-digital conversion technology ADC, especially ultra-large-scale digital circuits, multi-component T / R modules...

AI Technical Summary

Problems solved by technology

Although the method mentioned in the above literature realizes the function of digital beamforming, due to the limitation of data transmission volume, it is only suitable for one-dimensional or two-dimensional systems with a small array size and a small number of beams, and the flexibility of beam scanning is limited.

[0005] 2. Many scholars have proposed to use the sub-array-level DBF method to divide a large array into multiple sub-arrays for processing, thereby reducing the complexity of large-array signal processing, but these methods have certain defects, such as the use of uniformly adjacent sub-arrays, which has a simple structure , but there is a serious grating lobe phenomenon; the use of overlapping uniform sub-arrays reduces the number of grating lobes, but due to the existence of overlapping sub-array structures, the feed system is more complicated, and the engineering implementation is more difficult

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