Research Of Radio Source Localization Technology Based On Multi Terminal Network

Radio monitoring system is a kind of electromagnetic environment monitoring systems,is an important tool for the management of the radio spectrum.By using more than one monitoring node monitoring network,radio monitoring system discovery and location of radiation sources.This paper studies the multi-node network of radiation source localization algorithm.According to radio monitoring system for positioning and function and scenario selection algorithm was determined in RSSI localization algorithm and TDOA location algorithm as the core of radio-monitoring system calculation module.Analysis of some factors influencing the performance of RSSI and TDOA positioning.RSSI location,fast and slow decline for positioning the greatest performance impact.Fast and slow decline for the path loss of RSSI localization algorithm using model introduced two random variables,terminal between RSSI value and location of model bias,resulting in RSSI location deviation equations and instability.Hybrid filtering algorithm for RSSI value in time domain stability using penalty method in spatial domain constraints on loss factor,reduce the effect of fast fading and slow fading.Solution of equations of the initial selection also has some influence,so use a power weighted centroid localization as pre-registration algorithm to determine the initial solution.TDOA location tdoa estimation of accuracy of location is crucial,and how source is the effect of time delay estimation precision of multipath interference,signal bandwidth,signal sampling rate and other factors.Narrow-band signals with low signal to noise ratio,gravity method tdoa estimation using signal.Multi-sensor multipath problems,using the triangle inequality and normalized cross-correlation method to filter out other sources of interference;using DATEMM algorithm for solving fuzzy.Based on zero-sum algorithm of TDOA ring difference scores time estimates can be filtered filter mechanism.For low sampling rate signals using the interpolation and interpolation method of signal sampling rate,time delay estimation of higher resolution.