Monopulse radar apparatus
First Claim
Patent Images
1. A radar apparatus comprising:
- a transmitter transmitting a radar wave;
a signal receiver providing antenna beams which overlap with each other to define a plurality of monopulse areas, said signal receiver receiving a return of the radar wave from a target object in each of the monopulse areas to produce a pair of input signals;
an angular direction data determining circuit processing the input signals produced in each of the monopulse areas to obtain angular direction data, in time sequence, each indicating an angular direction of the target object based on differences in one of amplitude and phase between components of the input signals; and
a variation determining circuit determining a variation in angular direction data obtained, in time sequence, in each of the monopulse areas and determines the angular direction data whose variation is within a preselected allowable range as values effective in determining an angular direction of the target object.
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Abstract
A radar apparatus is provided which is capable of discriminating between azimuth angles of two or more targets moving side by side close to each other. The radar apparatus provides antenna beams which partially overlap with each other to define a plurality of monopulse areas and processes input signals produced in each of the monopulse areas to obtain angular direction data. The radar apparatus determines a time-sequential variation in angular direction data in each of the monopulse areas and determines the angular direction data whose variation is within a preselected allowable range as being effective in determining the angular direction of each target correctly.
47 Citations
8 Claims
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1. A radar apparatus comprising:
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a transmitter transmitting a radar wave;
a signal receiver providing antenna beams which overlap with each other to define a plurality of monopulse areas, said signal receiver receiving a return of the radar wave from a target object in each of the monopulse areas to produce a pair of input signals;
an angular direction data determining circuit processing the input signals produced in each of the monopulse areas to obtain angular direction data, in time sequence, each indicating an angular direction of the target object based on differences in one of amplitude and phase between components of the input signals; and
a variation determining circuit determining a variation in angular direction data obtained, in time sequence, in each of the monopulse areas and determines the angular direction data whose variation is within a preselected allowable range as values effective in determining an angular direction of the target object. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A radar apparatus comprising:
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a transmitter transmitting a radar wave;
a signal receiver providing antenna beams which overlap with each other to define a plurality of monopulse areas, said signal receiver receiving a return of the radar wave from a target object in each of the monopulse areas to produce a pair of input signals;
an angular direction data determining circuit processing the input signals produced in each of the monopulse areas to obtain angular direction data each indicating an angular direction of the target object based on differences in one of amplitude and phase between components of the input signals; and
a grouping circuit, if some of the angular direction data are close to each other within a given range, forming a group including the angular direction data close to each other within the given range; and
a determining circuit determining the angular direction data in the group as values effective in determining an angular direction of the target object.
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8. A radar apparatus comprising:
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a transmitter transmitting a radar wave;
a signal receiver providing antenna beams which overlap with each other to define a plurality of monopulse areas, said signal receiver receiving a return of the radar wave from a target object in each of the monopulse areas to produce a pair of input signals;
an angular direction data determining circuit processing the input signals produced in each of the monopulse areas to obtain angular direction data each indicating an angular direction of the target object based on differences in one of amplitude and phase between components of the input signals; and
a grouping circuit forming groups each including some of the angular direction data which are close to each other within a given range; and
a determining circuit determining the angular direction data belonging to one of the groups whose time-sequential variation is within a preselected range as values effective in determining an angular direction of the target object.
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Specification