Study Of Measurement Of Amplitude And Phase Of DBF Systems In Satellite Uplink And Do Wnlink

Digital beamforming system is used in radar, navigation, communication, antenna and electronic countermeasure system. In the process of transmission, transmission and reception, the multi- beam signal is in the process of one or more complex networks. The network is not consistent with the amplitude and phase o f the output beam. The characteristics of complex network are called weight matrix, and the amplitude and phase information are contained in the amplitude matrix. The measurement of the signal amplitude and phase characteristics of the multi channel signal is helpful to compensate the amplitude and phase of the antenna system loss by the estimation of amplitude and phase. So it is very important to estimate the amplitude and phase of DBF.In this paper, the main principle of the DBF amplitude and phase meas urement system on satellite is summarized, and the working principle and testing mode of the DBF amplitude and phase measurement system are introduced, and the parameters of the system are put forward based on the practical application.A new high speed parallel down conversion is proposed. This paper mainly introduces the design of high-speed parallel DDS signal generator and polyphase filter, and based on the above two modules, a low complexity high speed parallel down conversion is designed, and the simulation results and analysis of the system based on Matlab are presented.Then, according to the conversion of the working rate of the receiver of the DBF amplitude and phase measurement system on satellite, a kind of five level filter banks is designed. Through the theoretical analysis of the extraction filter, the design basis of the filter is obtained.Finally, the hardware implementation of the DBF amplitude and phase measurement system on satellite and the results of the system are introduced.The design of the hardware platform is introduced from three aspects: system composition, circuit design and signal conditioning network design. Then, the signal processing flow of the sending end and receiving end based on FPGA is described. In the end, the experimental results of the DBF amplitude and phase measurement system on satellite and phase measurement system are given and analyzed.