초록 ▼

A radar altimeter for determining altitude of an air vehicle comprises a transmitter for transmitting radar signals toward the ground. A first and a second antenna receive reflected radar signals from the ground. A signal processor is coupled to the first and the second antennas. The signal processo

A radar altimeter for determining altitude of an air vehicle comprises a transmitter for transmitting radar signals toward the ground. A first and a second antenna receive reflected radar signals from the ground. A signal processor is coupled to the first and the second antennas. The signal processor includes filter means for rejecting signals other than signals reflected from a selected ground swath. The signal processor determines the above ground level altitude of the air vehicle based on the radar signals output from the filter means. A phase ambiguity resolution means resolves phase ambiguities that arise due to multiple wavelength separation of the first and the second antenna. The signal processor also determines the horizontal position of the highest point in the selected ground swath. In a preferred embodiment, the phase ambiguity resolution means comprises a third antenna spaced closely to the first antenna such that there are no phase ambiguities between the reflected radar signals received by the third antenna and the first antenna.

대표청구항 ▼

1. A radar altimeter for determining altitude of an air vehicle with respect to ground, the radar altimeter comprising:a transmitter for transmitting radar signals toward the ground; a first and a second antenna for receiving reflected radar signals from the ground; a signal processor coupled to the

1. A radar altimeter for determining altitude of an air vehicle with respect to ground, the radar altimeter comprising:a transmitter for transmitting radar signals toward the ground; a first and a second antenna for receiving reflected radar signals from the ground; a signal processor coupled to the first and the second antennas, the signal processor including filter means for rejecting signals other than signals reflected from a selected ground swath, the signal processor determining the above ground level altitude of the air vehicle based on the radar signals output from the filter means; and phase ambiguity resolution means for resolving phase ambiguities that arise due to multiple wavelength separation of the first and the second antenna.