Tdoa Positioning Technology In The Application Of Smallradio Monitoring

With the radio technology development and application increasingly popular, a largenumber of radio stations set to use brought serious test to radio management. The radiomanagement department has been building a large number of small stations for theimplementation of effective radio signal regulatory. Radio direction finding and positioningis an important technical means in the daily radio monitoring work. But small station is notconfigured finding module. Development of small monitoring stations radiolocationfunction have practical significance on regulatory aspects in the frequency of the station forthe radio management departments.Based on radio monitoring network, now can take advantage of several smallerstations using the long baseline Time Difference of Arrival radiolocation technologies formulti.station high.power signal joint positioning to compensate for the small station can notbe achieved. In order to improve the positioning accuracy of the system, the timesynchronization system, estimated arrival time difference, hyperbolic mathematical modelpositioning algorithm has conducted in.depth research and improvement in this paper.In the time synchronization control, each monitoring site except the control centerusing the high.precision GPS control module to achieve time synchronization. In order toeliminate the data transmitting and geographic location error caused by delay, the paperproposed the use of software to set the time offset parameters to eliminate the errorinfluence; In the time estimation, because the system monitoring target signal forhigh.power continuous signal characteristics, so put forward the spectral autocorrelationtheory and generalized cross correlation theory of combining the time delay estimationmethod, which not only can effectively overcome the influence of noise, the valid signaland interference signal is similar also have good inhibitory effect; In the time differencepositioning algorithm, this paper is presented Chan algorithm which suitable for practicalengineering, using the first calculation results as the initial value and then repeated iterationto improve position accuracy.In addition, by analyzing and calculating the positioning error of system, the paper Putforward the principle of selecting proposed monitoring sites, based on the timesynchronization, the time difference estimate, model calculations improved test onbroadcast television, and high.power signal positioning accuracy significantly improve.