Radar target angle measuring system
First Claim
1. A radar system for measuring the angle of a target comprising:
- radar antenna means for producing at any instant one of a pair of directional radar beams, said beams angularly displaced with respect to each other and overlapping each other within the expected target direction;
radio frequency pulse means for generating and transmitting to said radar antenna means a train of radio frequency pulses to form a target acquisition cycle;
antenna beam switching means connected between said radar antenna means and said pulse means for switching, over a common time period, a first series of pulses extracted from said train of pulses to one of said radar beams and a second series of pulses extracted from said train of pulses to the other of said radar beams;
said first series of pulses being formed from every other pulse in said train of pulses and said second series of pulses being formed from the other of said pulses in said train of pulses;
said first series of pulses forming a first code and said second series of pulses forming a second code that differs from said first code;
radio frequency signal receiver means connected to said antenna means for receiving signals received by said antenna means during a predetermined time slot corresponding to a given range interval;
means for correlating signals received by said radio frequency receiver means with signals corresponding to said first and second codes to form first and second correlation outputs; and
means for determining the ratio of energy in said first and second correlation outputs to obtain to target angle.
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Accused Products
Abstract
A radar system for measuring an angle of a target. A radar antenna produc at any given instant, one of a pair of directional radar beams. The beams are angularly displaced with respect to each other and overlap within the expected target direction. A code generator sends a train of R-F pulses to the radar antenna. An antenna beam switch, connected between the antenna and the code generator, switches, over a set period of time, every other pulse to one radar beam and the remaining pulses to the other radar beam. The two resulting coded pulse groups differ from each other. A receiver is connected to the radar antenna to receive return signals during a time period which corresponds to a given target range distance. The return signals are auto-correlated with replicas of the transmitted coded signals and the respective correlation outputs are ratio compared with each other to determine exact target angles.
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Citations
1 Claim
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1. A radar system for measuring the angle of a target comprising:
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radar antenna means for producing at any instant one of a pair of directional radar beams, said beams angularly displaced with respect to each other and overlapping each other within the expected target direction; radio frequency pulse means for generating and transmitting to said radar antenna means a train of radio frequency pulses to form a target acquisition cycle; antenna beam switching means connected between said radar antenna means and said pulse means for switching, over a common time period, a first series of pulses extracted from said train of pulses to one of said radar beams and a second series of pulses extracted from said train of pulses to the other of said radar beams; said first series of pulses being formed from every other pulse in said train of pulses and said second series of pulses being formed from the other of said pulses in said train of pulses; said first series of pulses forming a first code and said second series of pulses forming a second code that differs from said first code; radio frequency signal receiver means connected to said antenna means for receiving signals received by said antenna means during a predetermined time slot corresponding to a given range interval; means for correlating signals received by said radio frequency receiver means with signals corresponding to said first and second codes to form first and second correlation outputs; and means for determining the ratio of energy in said first and second correlation outputs to obtain to target angle.
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Specification
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- Resources
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Current AssigneeThe United States of America As Represented By The Secretary of Agriculture
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Original AssigneeThe United States Of America As Represented By The Secretary Of The Army
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InventorsRittenbach, Otto E.
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Primary Examiner(s)BUCZINSKI, STEPHEN C
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Application NumberUS06/446,922Time in Patent Office428 DaysField of Search343/5 SW, 343/13 R, 343/16 R, 343/16 LS, 343/17.1, 343/17.2 PCUS Class Current342/155CPC Class CodesG01S 13/42 Simultaneous measurement of...
