System for locating a plurality of objects and obstructions and for detecting and determining the rolling status of moving objects, such as aircraft, ground vehicles, and the like
First Claim
1. A system for locating a plurality of objects and obstructions and for detecting and determining the rolling status of moving objects, such as aircraft, ground vehicles and the like in the region of an airport, including a plurality of transmitting and receiving stations (radar stations including a main station) comprising:
- means for permanently illuminating a definite area with coherent microwave radiation from a short-range radar network having at least three radar stations using simple fixed (nonrotating) antennas (AT, AR) with broad sector characteristics of about 90°
in the azimuth,said radar network further including fixed receiving antennas (AR) which have two adjacent subsector characteristics with one receiving channel per subsector being associated for suppression of ghost-targets, said receiving channels also comprising identification means for receiving signals from any other selected transmitter within the network, wherein these means of signal identification of other transmitters being effected by selecting different transmitting time-slots or station-specific pulse compression codes.
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Accused Products
Abstract
In a system for locating a plurality of objects and obstructions and for detecting and determining the rolling status of moving objects, such as aircraft, ground vehicles, and the like, in the area of an airport, a short-range radar network is provided having at least three radar stations. Via simple stationary non-rotating transmitting antennas with coherent time-pulsed microwaves or other microwave signal forms, a large sector in the azimuth of about 90° is illuminated, and the associated fixed receiving antennas, which have fixed subdivided sector characteristics, with one receiving channel per subsector, also receive signals from the other stations for bistatic measurements. The separation of the signals of individual stations is effected by selecting different frequencies, or alternatively, a time triggering of transmitted signals and receiver gates or by station-specific modulation codes. Illumination zones are chosen so there are no shadow zones caused by, e.g., buildings.
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Citations
19 Claims
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1. A system for locating a plurality of objects and obstructions and for detecting and determining the rolling status of moving objects, such as aircraft, ground vehicles and the like in the region of an airport, including a plurality of transmitting and receiving stations (radar stations including a main station) comprising:
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means for permanently illuminating a definite area with coherent microwave radiation from a short-range radar network having at least three radar stations using simple fixed (nonrotating) antennas (AT, AR) with broad sector characteristics of about 90°
in the azimuth,said radar network further including fixed receiving antennas (AR) which have two adjacent subsector characteristics with one receiving channel per subsector being associated for suppression of ghost-targets, said receiving channels also comprising identification means for receiving signals from any other selected transmitter within the network, wherein these means of signal identification of other transmitters being effected by selecting different transmitting time-slots or station-specific pulse compression codes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A radar system for locating multiple objects within a horizontal surveillance area, the system comprising:
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at least three transmitters emitting respective pulsed emitted signals, each of the emitted signals being distinguishable according to the particular respective transmitter from which the emitted signal was emitted; at least three receivers for detecting a reflected signal reflected from one object; the transmitters and receivers being separately deployed about a perimeter of the area; the emitted signals being emitted over respective azimuthal arc sectors, the sectors overlapping to cover the area; transmitter identification means, associated with each of the receivers, for identifying which one of the transmitters emitted the reflected signal; timing means for measuring a delay time to establish a signal path distance from any one of the transmitters, to the object, to any one of the receivers; computational means, coupled to the receivers, for locating the object at a point of the area by calculating intersections of arcs originating at respective transmitters, the arcs describing geometrical loci of the delay time, wherein the at least three transmitters provide a corresponding number of the reflected signal and of the delay time to locate the point unambiguously; and a memory, coupled to the computational means, for storing a plurality of points defining a track of the object when the object moves over the area. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification