Digital multi-beam correction and synthesis method

Abstract

The invention discloses a digital multi-beam correction and synthesis method, and aims to provide a multi-beam signal with wide frequency band coverage for an electronic reconnaissance system. According to the technical scheme, the method is implemented by the steps: enabling a received signal to be subjected to AD sampling through a channel module, completing AD analog-to-digital conversion of a receiving channel, and obtaining a baseband IQ data signal through an FPGA; carrying out the processing in two steps: 1, converting a waveform of a time domain to a frequency domain after FFT calculation and windowing of a preprocessing module, transmitting the waveform to a general processor, selecting a reference channel by the general processor, calculating the amplitude and phase difference between each channel and the reference channel, calculating a correction coefficient, issuing the correction coefficient to an FPGA, and enabling the FPGA correction filter bank to load a correction coefficient of a corresponding frequency band; 2, performing digital multi-beam synthesis on the broadband signal, and forming a beam signal of a multi-beam baseband signal pointing to different airspaces in a plurality of directions in a digital beam synthesis module for a rear-end signal detection and reception device to use or perform multi-beam direction finding processing.

Description

technical field [0001] The invention relates to a digital multi-beam correction and synthesis method for broadband reconnaissance. By correcting the multi-channel data, the consistency of the amplitude and phase of the channel data is guaranteed; the multi-channel data is weighted by means of multiple filter banks to form synthetic beams of different directions, which can be applied to modern reconnaissance systems to meet the requirements of broadband signal reconnaissance Receive and airspace full coverage requirements. Background technique [0002] With the development of today's wireless communication and radar technology, the processing capability of digital signal processing chips has been continuously improved, which has greatly developed digital beamforming. The multi-channel receiver is the only way for the signal in the DBF antenna system. It is this multi-receiving channel structure that increases the potential sources of amplitude and phase errors in the DBF ant...

AI Technical Summary

Problems solved by technology

At present, reconnaissance systems at home and abroad usually use narrow-band analog beamforming to detect and receive target signals. The beamforming is mainly completed by phase-shifting multi-channel signals. However, this method has small instantaneous bandwidth, weak multi-beam capability, and flexibility. However, it cannot meet the increasingly expanding instantaneous bandwidth coverage and flexible beamforming requirements of modern reconnaissance systems.

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