Digital beamforming device and method based on fpga programmable delay circuit

Abstract

The invention discloses a digital beam forming device and method of a programmable time delay circuit on the basis of an FPGA. The device comprises a programmable time delay module, a delay time control module and an accumulator. The delay time control module and the programmable time delay module are connected through a control bus, beams are output after an array antenna signal undergoes time delay through the programmable time delay module and is accumulated through the accumulator, the programmable time delay module is formed through parallel connection of programmable time delay units, each programmable time delay unit is formed through sequential serial connection of an either-or selector and a longitudinal time delay unit, each longitudinal time delay unit is formed through cascade connection of a plurality of basic time delay units, and the programmable time delay module is obtained by programmable constraint in a lookup table in the FPGA. According to the device and method, precise time delay can be carried out on the array antenna signal, waveform phase shift is achieved, signals of paths are compensated to wavefront alignment, and then the accumulator is used for accumulating signals after phase shift so as to achieve the aim that digital beams are formed without the need of a multiplier, and time delay can be accurate to a nanosecond level.

Description

technical field [0001] The invention belongs to the technical field of radar and digital beam forming, and in particular relates to a digital beam forming device and method based on an FPGA programmable delay circuit. Background technique [0002] Beamforming is a technology widely used in modern digital fields such as radar and communication. Beamforming typically works in conjunction with a transmit or receive array of acoustic, electromagnetic, light, etc. waves. [0003] In order for the sensor array to enhance the signal from one or more specific directions, the basic beamforming method is to delay the signal received by the array element according to the beam direction, and then compensate the signal of each channel aligned to the wavefront Add them together to get the beam output for that beam direction. [0004] The analog beamforming method mainly uses an analog delay device to delay the signal received by the beam element. However, due to uncontrollable physical...

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Problems solved by technology

However, this method needs to use a large number of multipliers, which has the disadvantages of high cost and large amount of calculation.

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