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Phased-array antenna beam control method

A phased array antenna and beam steering technology, applied in the field of phased array radar, can solve the problems of slow calculation speed, difficult implementation, and many storage resources, and achieve the effect of simple implementation method, accelerated calculation time, and fast calculation speed.

Pending Publication Date: 2021-12-07
10TH RES INST OF CETC
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Problems solved by technology

FPGA-based wave control code calculation method for phased array antennas to solve the problems of high wave control code calculation methods that are difficult to implement, slow calculation speed, large storage resources, and not universal enough

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  • Phased-array antenna beam control method

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Embodiment Construction

[0014] refer to figure 1 . According to the present invention, based on the Field Programmable Gate Array FPGA chip, the FPGA performs the trigonometric function sin(θ) on the multi-channel input phased array antenna phase θ and pitch angle φ front-end signals according to the principle and mathematical model of digital adaptive beamforming , COS(φ)sin(φ) look-up table calculation, the calculation result is sent to two series multipliers connected in parallel, the value of sin(θ)*COS(φ) obtained by multiplication of the first multiplier 1 is multiplied The multiplier 4 performs complex multiplication, and the multiplier 4 utilizes a nested loop to traverse i=0...m, j=0...n successively through the values ​​of i and j, and performs table lookup on i*dx and j*dy according to the values ​​of i and j , calculate i*dx*sin(θ)*COS(φ); the sin(θ)*sin(φ) multiplied by the second multiplier 2 is multiplied by the multiplier 5, and j is calculated according to the value of j *dy looks ...

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Abstract

A phased-array antenna beam control method disclosed by the invention is simple in implementation mode, high in calculation speed and high in operation efficiency. The method is realized through the following technical scheme: an FPGA carries out trigonometric function calculation on front-end signals of a phase theta and a pitch angle phi of a multi-path input phased-array antenna according to a digital adaptive beam forming principle and a mathematical model, and sends a calculation result into two paths of serial multipliers which are connected in parallel; the value of sin (theta) * COS (phi) obtained by multiplication of the first-path multiplier 1 is multiplied by the multiplier 4; the second-path multiplier 2 performs multiplication through the multiplier 5, the multipliers 4 and 5 accumulate multiplication results of all components through an adder at the same time, meanwhile, a frequency word f transmitted by a phased-array antenna terminal is operated through the multiplier 3, the multiplier 6 multiplies the result added by the adder with a 360 / lambda value output by the multiplier 3, then complementation is performed on 360, and a corresponding wave control code is obtained through a rounding-off module.

Description

technical field [0001] The invention relates to an FPGA-based phased array antenna wave control code calculation method, which is applicable to the fields of phased array radar and the like. Background technique [0002] In radar and sonar signal processing systems, the beamforming algorithm is usually implemented by DSP software programming, and the control logic circuit is implemented by CPLD. This method has the advantages of flexible software programming and easy expansion of functions, but it requires high real-time performance. In systems such as radar, sonar detection and ultrasonic imaging, in order to improve the real-time tracking and measurement of target changes, the signal processing time must be shortened. Too long calculation and processing time will have a greater impact on the detection performance of underwater targets. influences. The detection ability of sonar will drop rapidly, so that the detection ability will be completely lost, and adaptive beamform...

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Application Information

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IPC IPC(8): G05B19/042H01Q21/00
CPCG05B19/0423H01Q21/00G05B2219/24215Y02D30/70
Inventor 张晓波唐洪军任威赵小刚李超然
Owner 10TH RES INST OF CETC