Communication radar integrated transmitting-receiving method based on digital array antenna

Abstract

The invention belongs to the technical field of radar and discloses a communication radar integrated transmitting-receiving method based on a digital array antenna. The communication radar integrated transmitting-receiving method may simultaneous satisfy the performance requirements of communication and radar systems and comprises steps of: determining the transmitting wave beam weight vector of the digital array antenna; determining the transmitting signal waveform of the digital array antenna; adding a cyclic prefix to a constant-mode-value OFDM signal; multiplying the OFDM signal with the cyclic prefix by transmitting wave beam weight vector to complete signal transmission; acquiring the receiving data of the digital array antenna and determining the radar weight coefficient and the communication weight coefficient of the receiving end of the digital array antenna; obtaining a radar channel receiving signal according to the receiving data and the radar weight coefficient, and performing matched filtering on the radar channel receiving signal to obtain the distance information of a radar target; and obtaining a communication channel receiving signal according to the receiving data and the communication weight coefficient, and performing signal equalization coherent digital demodulation on the communication channel receiving signal successively so as to obtain a data bit stream transmitted by a communication base station.

Description

technical field [0001] The present invention relates to the field of radar technology, in particular to a communication radar integrated transceiver method based on a digital array antenna, which is used for the communication integrated signal transmission and reception of the digital array radar, and the communication radar integrated signal refers to modulation on the radar signal waveform Communication information, the two share a signal waveform, so as to realize the integration of communication and radar. Background technique [0002] With the development of radar technology and digital technology, modern radar is gradually digitized, and more and more attention and research have been paid to digital radar. Digital array radar is the main type of digital radar. Different from the traditional phased array radar, the digital array radar is a fully digital array scanning radar that adopts digital beamforming technology for both transmitting and receiving beams. The requir...

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Problems solved by technology

[0005] Aiming at the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a communication radar integrated transceiver method based on a digital array antenna, which can meet the performance requirements of communication and radar at the same time, so that signals can be transmitted and received at the same time by a common antenna, and a higher gain can be obtained. Save time and resources; mainly solve the problems in the existing technology based on the traditional analog phased array, such as the inflexible switching of signal transmission and reception beams, the inconvenient control of the zero point position, and the difficulty in achieving low beam sidelobes.

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