Pulse radar apparatus
First Claim
1. Pulse radar apparatus comprising a dispersive aerial arranged to give a directional beam, the direction of the beam with respect to the aerial in azimuth depending on the frequency of the transmitted and received signals, means for continuously rotating the aerial in the azimuth plane, transmitting means coupled to the aerial to produce pulses sequentially at a plurality of different frequencies, receiver means coupled to said aerial for receiving the radar return signals of the transmitted frequency after each transmitted pulse and separating the different frequencies to provide separate signals corresponding to the radar returns for each frequency, and display means correlating radar returns received as different frequency signals on separate channels from targets in the same azimuthal direction so that, for each target, in each aerial rotation, the different frequency transmissions provide separate signals angularly displaced by the aerial dispersion but which are correlated in the display means.
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Accused Products
Abstract
Pulse radar apparatus particularly for marine use has a dispersive antenna so that transmitted pulses sequentially of two or more different frequencies are radiated in different azimuthal directions. The antenna is continuously rotated and the receiver has separate channels for the different frequencies and display means correlating information received on different frequencies from the same azimuth thereby to reduce sea-clutter on the display.
18 Citations
13 Claims
- 1. Pulse radar apparatus comprising a dispersive aerial arranged to give a directional beam, the direction of the beam with respect to the aerial in azimuth depending on the frequency of the transmitted and received signals, means for continuously rotating the aerial in the azimuth plane, transmitting means coupled to the aerial to produce pulses sequentially at a plurality of different frequencies, receiver means coupled to said aerial for receiving the radar return signals of the transmitted frequency after each transmitted pulse and separating the different frequencies to provide separate signals corresponding to the radar returns for each frequency, and display means correlating radar returns received as different frequency signals on separate channels from targets in the same azimuthal direction so that, for each target, in each aerial rotation, the different frequency transmissions provide separate signals angularly displaced by the aerial dispersion but which are correlated in the display means.
Specification