Design Of Remote Image Wireless Transmission System

In this paper,the actual needs of the video target detection target in the research of high speed target in the sea,this paper proposes a design scheme of remote image wireless transmission system based on diversity combining receiver.With the further research and application of the baseband coding technology,the performance of the single channel receiver is close to the theoretical limit.Before the breakthrough of communication theory,it is the only feasible way to improve the performance of the system by means of reasonable planning and application of the existing technical means.A more effective method,transmitter emission signals using an antenna,the receiver using multiple receiving antenna,and according to certain principles of consolidation,a plurality of signal merger,by providing diversity gain and improve the received signal to noise ratio of the receiver to demodulate the signal to noise ratio lower effective signal.This paper mainly focuses on the multichannel spatial diversity combining techniques in signal analysis and signal synthesis of key technologies are studied,aiming at the receiving target signal separation,blind signal signal-to-noise ratio estimation,multi channel signal phase estimation,maximum ratio combining effect analysis and estimation error of diversity synthesis of in-depth discussion and analysis.The main work of this paper is the following aspects:First,according to the system requirements,the system needs to achieve the functional indicators,and so on the system design,subsystem design.Secondly,the performance of typical multi-channel spatial analysis synthesis technology is analyzed.Analysis of the maximum than synthetic and amplitude synthetic performance differences;simulation of the second and fourth order(M2M4)statistical moments of estimation method of signal to noise ratio(SNR)estimation accuracy and estimation accuracy of maximum than with performance.The simulation results show the multi-channel signal phase estimation accuracy and phase estimation error of maximal ratio combining performance effects of using MATLAB software simulation.Finally set up a four element array channel diversity receiver synthesis hardware platform,complete four channel diversity receiver system hardware design and logic design,logic program to achieve the diversity combining algorithm,and verified the designed hardware platform meets the design requirements.