Communications: directive radio wave systems and devices (e.g. – Presence detection only
Patent
1998-03-16
1999-10-12
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Presence detection only
342 28, 340541, 340552, G01S 1356
Patent
active
059660902
ABSTRACT:
A pulse Doppler radar motion sensor system and method for sensing target motion within a gated region is provided with approximately constant response versus target distance. The sensor includes a transmitter for transmitting a sequence of RF bursts comprised of a number of cycles at the transmitter frequency. The transmitted burst width alternates at a pattern frequency to provide a pattern of varying burst widths. The sensor includes a receiver responsive to the transmitted bursts and burst echoes from moving targets within its sensing field. The receiver produces a pattern frequency with a signal amplitude representative of the difference in moving target response for two different range gated regions defined by the transmitted burst widths. This difference is detected to provide a range invariant target motion response in a sharply defined region. Another mode provides a quadrature receive channel for target direction determination. Yet another mode time sequences the transmitted bursts to provide multiple range cell operation.
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