Study On The Opening Test Method Of Transmitting Equipmentin Radio And Television Stations

At present,the transmission test method is used in the radio and television equipment test.There are some problems which affect the normal work of the user equipment and low efficiency of the test work,if we can find the effective opening test methods,it can solve the above problems.This paper first introduces the prediction method of radio wave propagation characteristics of three kinds of mainstream,and explains the advantages of the deterministic model,then introduces three kinds of commonly used deterministic model and points out the ray tracing method is applied in the complex environment in the city is very wide.Then this paper describes the basic principle of ray tracing technique,classification,calculation method,several reasons and the accelerated algorithm of octree partitioning algorithm.This paper is to solve on the radio and television transmitting equipment for field opening test problems,considering the test point selection is generally in the transmitting stations in the visual range,so we only consider the horizon propagation path of radio waves,namely direct path and reflection path.This paper uses reverse ray tracing octree algorithm to establish the three-dimensional model,software programming using MATLAB.The model first calculates all the direct and reflected path test points from transmitting stations and calculated in the field test points,the superposition field direct and reflected path can be obtained after the test point of the total field intensity,the total road can be further calculated at stations to test point size loss.Based on the analysis of the field test data,the absolute value of the power measurement error is less than 3 dB.The error can be used to lock the range of the suspicious transmitting station and reduce the test quantity.