Patent RU-2289149-C2 (RU)
Inventor: KASATKIN BORIS ANATOL EVICH
IPC: G01S13/08
Filed: 2004-12-21
Granted: 2006-12-10
Abstract: FIELD: hydro-acoustic navigation systems, applicable for navigation support of long-range underwater vehicles. 
     SUBSTANCE: the hydroacoustic synchronous long-range distance measuring system has a bottom navigation base of M hydroacoustic transponders with different reply frequencies f m  (m=1-M), sync pulse oscillator, acoustic transmitter with sampling rate f 0 , whose input is connected to the first output of the sync pulse oscillator, M-channel receiver for reception of reply signals with frequencies f m , M meters of the time of propagation of acoustic signals to the transponder operating at the frequency of this channel and back, whose first inputs are connected to the outputs of the M-channel receiver, and the second inputs are connected to the second output of the sync pulse oscillator, MxN conversion units of the time intervals to distances according to the Number of probable beam trajectories, whose inputs are connected to the outputs of the respective meters of propagation time, M units of selection of the maximum value of distance, whose inputs are connected to the outputs of N units of conversion of time intervals to the distances of the given channel, and a computer of the navigation object co-ordinates, whose first input is connected to the outputs of the units of selection of the maximum value of distance of all M channels.  Besides, the hydroacoustic synchronous distance measuring navigation system has the second bottom navigation base of M hydroacoustic beacons - pingers with different emission frequencies F m  (m=1-M) mechanically linked with the respective M responder beacons containing M synchronously operating sync pulse oscillators, M transmitters with different operating frequencies F m , whose inputs are connected to the outputs of the sync pulse oscillators, M hydroacoustic radiators with operating frequencies F m , whose inputs are connected to the outputs of the transmitters with the respective operating frequencies, located on the navigation object are the second sync pulse oscillator operating synchronously with the sync pulse oscillators of the beacons-pingers, whose first output is used for synchronization of M synchronously operating sync pulse oscillators of the hydroacoustic beacons-pingers before their installation on the sea-floor, towed receiving acoustic aerial, the second M-channel receiver for reception of acoustic signals of the beacons-pingers, whose input is connected to the output of the towed receiving acoustic aerial, M meters of the time of propagation of acoustic signals from the beacons-pingers to the navigation object, whose first inputs are connected to the outputs of the second M-channel receiver, and the second inputs are connected to the second output of the second sync pulse oscillator, additional M units of conversion of time intervals to distances, whose inputs are connected to the outputs of M meters of the time of propagation of acoustic signals from the beacons-pingers to the navigation object, and the outputs are connected to the second inputs of the computer of the navigation object co-ordinates, and the towed receiving acoustic aerial are located near the sea floor at a distance of not more than the wavelength at operating frequencies F m .  Additional M units of conversation of time intervals to distances compute desired distances r m  from measured propagation times t m . 
     EFFECT: provided determination of the navigation object co-ordinates at short and long distances with a minimal error. 
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