Differential pulse radar motion sensor
First Claim
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; and
signal 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.
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Accused Products
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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Citations
56 Claims
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1. A sensor comprising:
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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; and signal 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A sensor comprising:
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a transmitter which transmits a sequence of transmitted bursts of electromagnetic energy to produce a sensor field, the transmitter including a radio frequency oscillator responsive to burst width control signals to produce the transmitted bursts having a transmitter frequency between about 900 megaHertz and 24 gigaHertz, and a burst width control circuit, coupled to the oscillator, which generates the burst width control signals to vary the burst widths of the transmitted bursts in the sequence of transmitted bursts according to a pattern, the transmitted bursts having burst widths in a range of about 2 to 100 nanoseconds; a receiver which receives a combination of the transmitted bursts and reflections of the transmitted bursts and produces a combined output; and signal processing resources responsive the combined output which generate a sensor output signal indicating motion in the sensor field indicated by differences in the combined output due to the pattern of varying burst widths. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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55. A method for detecting disturbance in a sensor field, comprising:
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transmitting 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; receiving a combination of the transmitted bursts and reflections of the transmitted bursts and producing a combined output; and processing the combined output to generate a sensor output signal indicating variations in differences in the combined output due to the pattern of varying burst widths. - View Dependent Claims (56)
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Specification