DISTANCE-MEASURING EQUIPMENT

摘要

The rhythmic spacing between two radiating antennas or the rhythmic spacing between two receiving antennas provide doppler-shifted signals which when measured in a receiver provide a measure of distance between the transmitting and receiving antennas. In a preferred embodiment, a beacon radiates a first frequency from a stationary antenna and a second frequency sequentially from a linear array of stacked antennas. At a receiver the signals received by each of a spaced antenna pair are separately processed to extract therefrom a first and second doppler frequency. The difference between said first and second doppler frequencies provides a measure of the distance. In another preferred embodiment, a first and second frequency are respectively radiated from a spaced pair of antennas. A first antenna coupled to a receiver provides a first beat frequency. A linear array of antennas sequentially coupled to said receiver provides a doppler shifted second beat frequency. The difference between said beat frequencies provides a measure of distance.