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US 4,907,001 AGranted
Extraction of radar targets from clutter
AssigneeGeophysical Survey Systems, Inc.
InventorHenning F. Harmuth
Life of this patent
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AssigneeGeophysical Survey Systems, Inc.
InventorHenning F. Harmuth
Estimating the term…
The extraction of radar targets, in particular airplanes or cruise missiles, from clutter is typically based on the target's velocity relative to the ground. Equipment using this principle is usually referred to as a doppler processor or moving target indicator. In situations where severe clutter is encountered, as for example where a look-down radar is trying to find low-flying cruise missiles, extraction of the target solely through its velocity relative to the ground is generally unsatisfactory. A similarly situated human observer looking down can recognize a target both from its motion and the characteristic shape of a fuselage with wings. The principle of this "shape recognition" or "pattern recognition" is here applied to radar by utilizing the so-called radar signature of the target. The conventional small-relative-bandwidth radar which uses signals that are amplitude modulated onto a sinusoidal carrier does not yield enough of a radar signature for this application but the so-called "carrier-free radar" does. Carrier-free radar is also known as "impulse radar", "nonsinusoidal radar", or "large-relative-bandwidth radar".
A method of determining the shape or pattern of a radar target from the characteristic distortion imparted in the time domain to the radar signal returned by the target from an incident, transmitted carrier-free radar signal, where the range resolution of the incident radar signal is significantly smaller than the dimensions of the target, comprising the steps of:
A method of identifying a radar target shape or pattern from the characteristic distortion imparted in the time domain to the radar signal returned by the target from an incident, transmitted carrier-free radar signal, where the range resolution of the incident radar signal is significantly smaller than the dimensions of the target, comprising the steps of:
A method of identifying a radar target shape or pattern from the characteristic distortion imparted in the time domain to the radar signal returned by the target from an incident, transmitted carrier-free radar signal, where the range resolution of the incident radar signal is significantly smaller than the dimensions of the target, comprising the steps of:
A method of identifying a radar target shape or pattern from the characteristic distortion imparted in the time domain to the radar signal returned by the target from an incident, transmitted carrier-free radar signal, where the range resolution of the incident radar signal is significantly smaller than the dimensions of the target, comprising the steps of:
Dependencies are inferred from the claim text.