High repetition frequency side-looking pulse radar system
First Claim
1. In a side-looking airborne pulse radar system, means for maintaining the direction of an echo received in the middle of each recurrence from a ground area observed by the radar system, substantially coincident with a predetermined axis, comprising:
- angular measuring means responsive to the angular interval between said axis and the direction of received ground echos and to the pulse repetition frequency of the radar system for providing an output signal indicative of the amplitude and the sense of the angular inerval between said axis and the direction of the echo received in the middle of each recurrence; and
frequency controlled pulse repetition frequency generator means coupled to the output of said angular measuring means for controlling the pulse repetition frequency of said radar system so as to tend to reduce said angular interval to null.
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Abstract
The invention relates to side-looking radar systems and more especially to high altitude airborne radar systems functioning at a high repetition frequency. In order to avoid ambiguities in regard to distance, the antenna comprises an additional channel which has a radiation pattern which has an odd symmetry about its axis and means are connected to said antenna for deriving the angular interval relative to the axis of the antenna of the direction of the obstacle corresponding to the received echoes. Gating means select the angular interval signal at the middle of the recurrence, for controlling the recurrence frequency of the radar and maintaining the ambiguous areas outside the selected observed area.
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Citations
4 Claims
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1. In a side-looking airborne pulse radar system, means for maintaining the direction of an echo received in the middle of each recurrence from a ground area observed by the radar system, substantially coincident with a predetermined axis, comprising:
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angular measuring means responsive to the angular interval between said axis and the direction of received ground echos and to the pulse repetition frequency of the radar system for providing an output signal indicative of the amplitude and the sense of the angular inerval between said axis and the direction of the echo received in the middle of each recurrence; and frequency controlled pulse repetition frequency generator means coupled to the output of said angular measuring means for controlling the pulse repetition frequency of said radar system so as to tend to reduce said angular interval to null. - View Dependent Claims (2, 3, 4)
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Specification