METHOD FOR DETERMINING TRUE SPEED OF WATERCRAFT AND DEVICE FOR REALIZATION OF SAID METHOD Russian patent published in 2005 - IPC

FIELD: measuring equipment engineering.

SUBSTANCE: method includes receipt of signals from external correction means by onboard station, measurement of Doppler frequency shift, determining of true speed on basis of measured Doppler frequency shift, comparison of received values of true speed to values, received on basis of indications of watercraft log, determining lag error. Receipt of signals by onboard station is determined during movement of watercraft along direct destination route, within range of working frequencies 1570-1620 MHz, with frequency of bearing signal 311 MHz, with transformation of received signals to frequencies band 15-65 MHz, with folding of pseudo-random series signal by code of certain navigation spacecraft, after which second intermediate frequency of 420 KHz is received, signal of which bears information about ephemeredes and information about Doppler frequency shift, measurement of which is performed at frequency 3,36 MHz. Determining of lag error is performed using electronic cartographic navigation system, and device for determining true speed has antenna block, connected to receipt indicator, lag and route pointer mating block and electronic cartographic system, while block for mating with lag and route pointer by its inputs-outputs is connected to inputs-outputs of receipt indicator, lag, route pointer and electronic cartographic system, appropriately.

EFFECT: higher precision, higher efficiency.

2 cl, 4 dwg