초록 ▼

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

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.

대표청구항 ▼

[ What is claimed is:] [1.] A sensor comprising:a transmitter which transmits a sequence of transmitted bursts of electromagnetic energy to produce a sensor field, the transmitted bursts having burst widths which vary according to a pattern;a receiver which receives a combination of the transmitted

[ What is claimed is:] [1.] A sensor comprising:a transmitter which transmits a sequence of transmitted bursts of electromagnetic energy to produce a sensor field, the transmitted bursts having burst widths which vary according to a pattern;a receiver which receives a combination of the transmitted bursts and reflections of the transmitted bursts and produces a combined output; andsignal processing resources responsive the combined output which generate a sensor output signal indicating variations in differences in the combined output due to the pattern of varying burst widths.