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US 2014/0320339 A1Published application
Systems and methods for tracking power modulation
AssigneeInterstate Electronics Corporation
InventorsSteven B. Alexander, Richard Redhead
Life of this patent
Estimating the term…
Abstract
Apparatus and methods determine the rotational position of a spinning object. A satellite positioning system can be used to determine the spatial position of an object, which in turn can be used to guide the object. However, when the object is spinning, such as an artillery shell, then the rotational orientation should be known in order to properly actuate the control surfaces, such as fins, which will also be spinning.
Claims21
(canceled)
An apparatus comprising:
- a projectile antenna up estimator configured to:
- receive at least a roll phase and roll rate of an amplitude modulation of a signal from a first space vehicle, wherein the amplitude modulation is caused by spinning of a projectile;
- receive an azimuth angle associated with the first space vehicle;
- and
- determine a first state of a spin of the projectile for a first time based at least partly on the roll phase, roll rate, and the azimuth angle.
2 more elements
A method of generating spin information for flight control of a projectile, the method comprising:
- receiving at least a roll phase and roll rate of an amplitude modulation of a signal from a first space vehicle, wherein the amplitude modulation is caused by spinning of a projectile;
- receiving an azimuth angle associated with the first space vehicle;
- and
- determining a first state of a spin of the projectile for a first time based at least partly on the roll phase, roll rate, and the azimuth angle.
1 more element
Dependencies are inferred from the claim text.