Abstract: A low cost, real time, remote sensor device for accurately measuring distance to an object with a resolution of 1 millimeter or better using phase information from either electromagnetic or acoustic energy. The device repetitiously transmits a swept frequency and decodes the resulting echo to produce a phase gate which is then converted to an accurate measurement of the range from each sweep. A method for measuring the time between two known phase points on a return signal is employed to determine the range measurement. Since the phase of the signal is used to determine range, the resolution is not dependent on bandwidth.

Abstract: A device for measuring the velocity of vehicles for traffic monitoring a doppler signal transmitter and receiver is used which comprises two mixer diodes arranged to deliver two doppler signals which are dephased against each other by 90.degree., the one or the other signal leading the other, depending on whether the picked up vehicle approaches or recedes from the doppler signal transmitter is fed into a frequency measuring device for measuring the signal frequency as a quantitative measure for the relative velocity between vehicle and doppler signal transmitter. For this purpose one signal of the doppler signal transmitter and receiver 10 is fed into a phase control circuit 34, the output frequency of which is converted into a voltage proportional to the relative velocity between doppler signal transmitter 10 and monitored vehicle. Furthermore, the two signals of the doppler signal transmitter and receiver are fed into a phase detector 26.

Abstract: A docking information system for assistance in the docking of vessels uses sensors providing information indicative of the relationship between a ship and a reference, such as a dock, a coast line, a river bank, docks, bends and docking areas. A computer coordinates the information. A wireless transmitter associated with the computer transmits signals indicative of the information. A portable receiver and indicator carried by the captain of the vessel has a receiver for receiving the transmitted signals and an indicator screen to display the information. The remote receivers also include fixed monitors on the ship and on shore, and telephones on the ship which communicate with the computer and into the telephone link with shore-based communications.

Abstract: A relative velocity indicator system for assistance in the docking of vessels uses a radar sensor providing a relative velocity signal indicative of the relative velocity between a ship and a reference, such as a dock. A wireless transmitter associated with the radar sensor receives said relative velocity signal and transmits a signal indicative of said relative velocity signal. A portable receiver and indicator unit carried by the captain of the vessel has a receiver for receiving the transmitted signal and an indicator arranged to receive, from said receiver, a receiver signal indicative of the transmitted signal and, thereby, of the relative velocity signal for indicating the relative velocity between ship and reference.