Abstract: A wave measuring buoy for measuring ocean surface wave amplitude, frequency and direction of propagation is disclosed. The buoy includes a single-axis accelerometer suspended as a pendulum inside a water-proof housing. The water-proof housing is connected to and beneath the flotation hull of the buoy and is located at the center of rotation of the buoy assembly so that the accelerometer is substantially insensitive to roll and pitch motions of the buoy. An inclinometer and a compass are fixedly mounted inside of said flotation hull. Inasmuch as the inclinometer is fixed in the water-proof housing it responds to the pitch and roll motions of the buoy and the compass indicates the direction of said roll and pitch. The output of the accelerometer is an analog signal proportional to the vertical (heave) acceleration of the buoy. The outputs of the inclinometer and the compass are analog signals which indicate the pitch and roll of the buoy and the magnetic heading of said pitch and roll.

Abstract: A short range, precision navigation and tracking system and method therefor are disclosed. The navigation and tracking system utilizes a master-repeater configuration with a phase lock loop controlling the modulation frequency of the master FM transmitter.

Abstract: A wave measuring buoy for measuring ocean surface wave amplitude and frequency is disclosed. The buoy includes a single-axis accelerometer suspended as a pendulum inside a water-proof housing. The waterproof housing is connected to and beneath the flotation hull of the buoy and is located at the center of rotation of the buoy assembly so that the accelerometer is substantially insensitive to roll and pitch motions of the buoy. The output of the accelerometer is an analog signal proportional to the vertical (heave) acceleration of the buoy. A frequency transfer calibration can be applied to the accelerometer output to compensate for the mass, size and resonant heave behavior of the buoy.