Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Receiver
Patent
1996-12-20
1998-09-15
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Return signal controls radar system
Receiver
342159, 342162, 342 95, G01S 7292, G01S 734
Patent
active
058085793
ABSTRACT:
A cell averaging (CA) constant false alarm rate (CFAR) device for use in a radar system which filters noise and clutter from a signal containing a plurality of range cells. A moving window average calculator (MWAC) calculates a moving window average (MWA) for each range cell in a signal. A central processing unit (CPU) estimates a skew factor of a probability density function (PDF) and calculates an offset factor based on information contained in the signal. A multiplying device multiplies the offset factor by the MWA calculated for each range cell and creates a second signal containing a plurality of range cells. A comparator compares each range cell of the second signal to each corresponding range cell of the original signal, selects a the larger value of the two signals, and creates a third signal which is essentially free of noise and clutter.
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Northrop Grumman Corporation
Sotomayor John B.
Sutcliff Walter G.
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