Passive ranging of an airborne emitter by a single non-maneuvering or stationary sensor
First Claim
1. A method of passively determining the range to a moving target from a single test platform, said method comprising the steps oftraveling at a constant velocity a course in the test platform which is straight;
- detecting at said platform the presence of an energy signal radiating from the target, and sampling said energy signal at three discrete times;
generating for each of said energy signal samples a first detection signal responsive to its angle of arrival at said platform, and a second detection signal responsive to its frequency on arrival at said platform;
storing said detection signals;
determining the range to said target utilizing said stored detection signals and said test platform velocity and position; and
generating a target indication signal representative of the range of said target.
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Accused Products
Abstract
A method for passively determining the range of a target vehicle relative to a non-cooperating moving test platform is disclosed. The method includes the steps of moving the test platform along a single linear path at a constant speed, while simultaneously performing a succession of bearing and frequency measurements on a radiant signal emitted by the moving target vehicle. Similarly, the test platform may remain stationary so that its velocity is zero. The measured parameters, along with knowledge of the test platform'"'"'s own position and velocity, permit the range to the emitter, its velocity and its transmitted frequency to be determined.
41 Citations
30 Claims
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1. A method of passively determining the range to a moving target from a single test platform, said method comprising the steps of
traveling at a constant velocity a course in the test platform which is straight; -
detecting at said platform the presence of an energy signal radiating from the target, and sampling said energy signal at three discrete times; generating for each of said energy signal samples a first detection signal responsive to its angle of arrival at said platform, and a second detection signal responsive to its frequency on arrival at said platform; storing said detection signals; determining the range to said target utilizing said stored detection signals and said test platform velocity and position; and generating a target indication signal representative of the range of said target. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 30)
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12. A method of passively determining the range to a moving airborne target from a single test aircraft, said method comprising the steps of
traversing a linear path in the test aircraft at a constant velocity; -
sampling at said test aircraft a radio signal emitted by the target at three discrete times; generating for each of said samples a first detection signal responsive to its angle of arrival at said test aircraft, and a second detection signal responsive to its frequency on arrival at said test aircraft; determining the range to said airborne target utilizing said first and second detection signals and said test aircraft velocity; and generating a target indication signal representative of the range to said target. - View Dependent Claims (13, 14, 15)
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16. A method of passively determining the range to a target from a test platform, said method comprising the steps of
traveling at a constant velocity a course in the test platform which is straight; -
detecting at said platform the presence of an energy signal radiating from the target, and sampling said energy signal at three discrete times; generating for each of said energy signal samples a first detection signal responsive to its angle of arrival at said platform, and a second detection signal responsive to its frequency on arrival at said platform; storing said detection signals; determining the range to said target utilizing said stored detection signals and said test platform velocity and position, including calculating the transmission frequency of said energy signal, calculating an angle between a bearing line to said target and the course of said target at a first of said discrete sample times utilizing said transmission frequency, calculating the velocity of said target utilizing said calculated angle, and determining the range to said target utilizing said calculated angle and said target velocity; and generating a target indication signal representative of the range of said target. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method of passively determining the range to an airborne target from a test aircraft, said method comprising the steps of
traversing a linear path in the test aircraft at a constant velocity; -
sampling at said test aircraft a radio signal emitted by the target at three discrete times; generating for each of said samples a first detection signal responsive to its angle of arrival at said test aircraft, and a second detection signal responsive to its frequency on arrival at said test aircraft; determining the range to said airborne target utilizing said first and second detection signals and said test aircraft velocity, including calculating the transmission frequency of said energy signal, calculating an angle between a bearing line to said target and the course of said target at a first of said discrete sample times utilizing said transmission frequency, calculating the velocity of said target utilizing said calculated angle, and determining the range to said target utilizing said calculated angle and said target velocity; and generating a target indication signal representative of the range to said target. - View Dependent Claims (27, 28, 29)
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Specification