Method for synchronous transmission of digital array antenna baseband excitation data

Abstract

The invention discloses a method for synchronous transmission of digital array antenna baseband excitation data. The method is featured by small channel phase error, simple processing of digital processing part and low power consumption baseband excitation data. In the method, optical fiber is adopted as a long-distance transmission media between a collecting end and a receiving end, 1-N ADC1-ADCNof the collecting end perform data sampling on RF signals, and convert the signal into an intermediate frequency signal, packages data according to a JESD204B protocol and converts the data into a high-speed serial data flow, and sends the data flow to an electro-optical conversion module to be converted into optical signal, then an optical fiber photoelectric conversion module recovers the optical signal into an electric signal and sends the electric signal to the receiving end FPGA1-FPGAK to complete data recovery, then data is aligned through channel calibration, sample signals with data aligned are simultaneously transmitted to a received data processing end FPGA, and a full link data synchronous transmission homologous synchronous clock network synchronizes data.

Description

Technical field [0001] The invention relates to a digital array antenna DAA in the fields of measurement and control, optical fiber communication and time-frequency synchronization technology, and particularly relates to a method for synchronous transmission of digital array antenna multi-channel data optical fiber communication. Background technique [0002] With the development of photonics technology and the substantial reduction of optical fiber cost, optical fiber transmission has been widely used in phased array antennas. The introduction of optical technology into the phased array antenna has brought many advantages. The use of optical fiber as the transmission medium is light in weight, small in size, flexible, strong in electromagnetic interference (EMI) and electromagnetic pulse (EMP), and has low loss. Solve the problem of size and weight limitations caused by cable feeding, and conductive cables that interfere with the radiation direction of the transmitter unit. And...

AI Technical Summary

Problems solved by technology

Although the beamforming of the all-digital array antenna is flexible, its digital processing part is complex, with high power consumption and large volume. Especially for a relatively large-scale digital array, it is difficult to integrate the processing end and the antenna end together. The signal of each channel is digitized at the front end of the antenna, and the digitized signal is transmitted to the processing end for beamforming processing; when the digital array is sent, the baseband signal needs to be transmitted to the sending end to complete the signal excitation transmission

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