Low-frequency signal generation method based on array structure

Abstract

The invention provides a low-frequency signal generation method based on an array structure. The low-frequency signal generation method comprises the steps of: enabling each radiation unit in a hectometer-level array structure to sequentially transmit pulse signals from the near end to the far end of an array at a certain time interval, and enabling an equivalent radar to move away from a target at a low beam speed; setting a phase of the radiation unit signal according to the electromagnetic wave Doppler effect, and realizing the movement of the target region radiation unit signal envelope through the time interval and the wave path difference of the signal emission of adjacent radiation units; enabling the phase equivalently formed in a target region space to rapidly change in a fast time and change for multiple times in a single carrier cycle time through a mode of signal phase modulation of a radiation unit or staggered arrangement of a plurality of rows of arrays to construct a staggered array, so that a low-frequency signal is synthesized, and the pulse width of the synthesized signal is broadened relative to the signal of the radiation unit; and under the condition of the staggered array, transmitting periodic pulse string signals by the radiation units, setting an initial phase of each pulse according to the Doppler effect, and further reducing the frequency of the synthesized signal.

Description

technical field [0001] The present disclosure relates to the technical fields of array antennas, signals and information processing, and in particular to a low-frequency signal generation method based on an array structure. Background technique [0002] Low-frequency electromagnetic wave signals are beneficial to the detection of low-altitude small targets. If high-frequency radars can be used to generate low-frequency electromagnetic wave signals and irradiate the target area, and then use low-frequency band external radiation source radar to detect targets, the detection ability of low-altitude small targets will be improved. . Generating low-frequency electromagnetic wave signals based on high-frequency antennas to achieve multi-band signal irradiation on targets may not only reduce the size of low-frequency antennas, but may also become a way to improve radar target detection performance. The 10kHz low-frequency electromagnetic wave signal has a strong ability to penetr...

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Problems solved by technology

[0005] This disclosure provides a low-frequency signal generation method based on an array structure to solve the technical problem that the application of low-frequency electromagnetic wave signals is limited by the size of the transmitting antenna

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