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|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||367/91 ; 367/90|
|§371/§102 date||19911115 (19911115)|
|발명자 / 주소||
|출원인 / 주소||
|인용정보||피인용 횟수 : 9 인용 특허 : 0|
A system measures the velocity of a moving body such as a ship and a water body. The system uses a first apparatus which measures the speed of a moving body by detecting a phase difference between a reference signal and echo signals resulting from a transmitted ultrasonic signal, implementing a Fourier transformation on the phase difference data obtained, computing the speed of the ship with respect to the water based on the Fourier spectrum data, and, computing the velocity of a water current based on the speed of the ship with respect to the ground and...
An apparatus for measuring a speed of a ship with respect to the ground and a speed of the ship with respect to water and determining a velocity of a water current comprising: speed means for measuring a position of at least two points on the Earth and a time required to travel between the two points and for obtaining the speed of the ship with respect to the ground based on the measured positions and time; transmitting means for transmitting ultrasonic signals into the water; phase difference detecting means for detecting a phase difference between a re...