Patent RU-2195779-C2 (RU)
Title: Method fixing position of mobile object
Inventor: URETSKIJ JA S
IPC: H04B7/26
Filed: 2001-03-23
Granted: 2002-12-27
Abstract: FIELD: radio navigation, location of mobile objects. SUBSTANCE: method fixing position of mobile object consists in location of base stations with unique identification number assigned to each base station in conventional cells presenting equal regular hexagons densely covering serviced territory. Coverage radii of base stations are set to be equal to length of side of each regular hexagon. Call radio signals are emitted on specified working frequency by positioned mobile object which is one of mobile objects located within limits of serviced territory. These call radio signals are received by base stations in which coverage positioned mobile object is located. These base stations transmit information signals containing identification numbers of mentioned base stations. Location of positioned mobile object is fixed by these information signals. Base stations are placed in vertexes of above-mentioned regular hexagons. Transmitted information signals containing identification numbers of base stations within which coverage positioned mobile object is located are corresponding information radio signals. Information radio signals from above-mentioned base stations are sent to mobile objects located within limits of serviced territory. Six various working frequencies are allocated to send radio signals emitted by all base stations. Out of six assigned working frequencies each base station located in vertex of regular hexagon is assigned with one working frequency for emission of radio signals from this base station which differ from radio signals emitted by base stations located in adjacent vertexes of these regular hexagons. Out of six working frequencies each mobile object is assigned with five different working frequencies of information radio signals received at this mobile object. In addition coordinates of location of all base stations as well as identification numbers corresponding to them and radii of coverage of all base stations are specified at each base station and at mobile objects located within limits of serviced territory. Transmission of information radio signals from base stations in which coverage positioned mobile object is located to mobile objects located within limits of service territory consists in emission of information radio signals on assigned working frequency from one of base stations first. All base stations which are adjacent relative to mentioned base station receive information radio signals emitted by the latter and send them on corresponding assigned working frequencies. Then all other base stations which are adjacent relative to mentioned base stations received information radio signals emitted from said base stations and send them on corresponding assigned working frequencies. After this information radio signals emitted by previous base stations are received at all other following base stations which are adjacent relative to previous base stations within limits of service territory in similar way, in sequence, from all directions from mentioned base station in which coverage positioned mobile object is located. Later information radio signals from all other base stations in which coverage positioned mobile object is located are sent in similar way, in turn to mobile objects located within limits of serviced territory. Emission of information radio signals on assigned working frequency from each base station, except base station which identification number is included in transmitted information radio signals, is carried out with reception by this base station of information radio signals on one of working frequencies assigned for this base station. Information radio signals transmitted from each base station in which coverage positioned mobile object is located are received by mobile objects located within limits of serviced territory on assigned working frequencies. Location of positioned mobile object is fixed on mobile objects located within limits of serviced territory and on base stations by identification numbers of base stations in which coverage positioned mobile object is located as well as by specified coordinates of locations and radii of coverage of these base stations. Each base station measures power of information radio signals received from adjacent base stations. Then each base station emits service radio signals carrying information on power of information radio signals emitted by this base station. Each adjacent base station receives said service radio signals and determines by them ratio of measured values of power of information radio signals received by this base station to corresponding values of power of information radio signals emitted by base stations which adjacent relative to mentioned base station. Sensitivity of channel receiving call radio signals emitted by positioned mobile object is adjusted at each mentioned adjacent base station by obtained ratios of values of power. EFFECT: increased precision of fixing positions of mobile objects and widened potential of method thanks to rational location of base stations on serviced territory. 7 dwg