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US 4,271,412 AGranted
Range tracker utilizing spectral analysis
AssigneeRaytheon Company
InventorsJeremy M. Glass, George G. Lampke, Roger L. St. Germain
Life of this patent
Estimating the term…
Abstract
A radar system transmits a signal to a target wherein the frequency is modulated with a sinusoidal modulation pattern. The difference between the actual target range and an estimate thereof is subjected to a spectral analysis wherein the spectral terms are described by Bessel functions. A second order range tracking loop, responsive to the relative magnitudes of the spectral terms, and an estimator of target radial acceleration, responsive to successive values of the spectral terms, provide components of the range estimate.
Claims10
An echo measurement system comprising:
- means for transmitting a signal to a target, said transmitting means providing a replica of said signal, said signal including a modulation of a frequency thereof with a periodic modulation pattern;
- means for receiving said signal as reflected from said target, said receiving means including means for modifying said replica to compensate for the effects of target movement on the frequency spectrum of said signal;
- and
- wherein said modifying means includes means for multiplying said replica by said signal, analyzer means for providing a set of spectral lines of a product of said multiplying means, and means responsive to the differences among spectral lines of said product for modifying said replica with a compensating signal to null the effects of said target movement, said compensating signal having range data therein.
1 more element
A system comprising:
- means for transmitting a signal having a modulation pattern thereon, and means for receiving said signal at a time subsequent to the transmission of said signal, said transmitting means including means for coupling a replica of said signal to said receiving means;
- said receiving means including means for extracting spectral lines of the spectrum of a difference signal, and means coupled between said receiver and said extracting means, and responsive to the relative magnitudes of said spectral lines for modifying said replica to bring its modulation pattern into coincidence with a modulation pattern of the signal received by said receiver;
- and
- said receiving means further including means coupled to said modifying means for combining said received signal with said modified replica to provide said difference signal, said modifying means providing data relating to the propagation of the signal transmitted by said transmitter to said receiver.
1 more element
Dependencies are inferred from the claim text.