Phase coded, micro-power impulse radar motion sensor

Patent · Mon Jan 01 00:00:00 EST 1996

OSTI ID:870430

McEwan, Thomas E ^[1]

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1. Livermore, CA

A motion sensing, micro-power impulse radar MIR impresses on the transmitted signal, or the received pulse timing signal, one or more frequencies lower than the pulse repetition frequency, that become intermediate frequencies in a "IF homodyne" receiver. Thus, many advantages of classical RF receivers can be thereby be realized with ultra-wide band radar. The sensor includes a transmitter which transmits a sequence of electromagnetic pulses in response to a transmit timing signal at a nominal pulse repetition frequency. A receiver samples echoes of the sequence of electromagnetic pulses from objects within the field with controlled timing, in response to a receive timing signal, and generates a sample signal in response to the samples. A timing circuit supplies the transmit timing signal to the transmitter and supplies the receive timing signal to the receiver. The relative timing of the transmit timing signal and the receive timing signal is modulated between a first relative delay and a second relative delay at an intermediate frequency, causing the receiver to sample the echoes such that the time between transmissions of pulses in the sequence and samples by the receiver is modulated at the intermediate frequency. Modulation may be executed by modulating the pulse repetition frequency which drives the transmitter, by modulating the delay circuitry which controls the relative timing of the sample strobe, or by modulating amplitude of the transmitted pulses. The electromagnetic pulses will have a nominal center frequency related to pulse width, and the first relative delay and the second relative delay between which the timing signals are modulated, differ by less than the nominal pulse width, and preferably by about one-quarter wavelength at the nominal center frequency of the transmitted pulses.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• Assignee: Regents of University of California (Oakland, CA)
• Patent Number(s): US 5519400
• OSTI ID: 870430
• Country of Publication: United States
• Language: English

Related Subjects

phase
coded
micro-power
impulse
radar
motion
sensor
sensing
mir
impresses
transmitted
signal
received
pulse
timing
frequencies
repetition
frequency
intermediate
homodyne
receiver
advantages
classical
rf
receivers
realized
ultra-wide
band
transmitter
transmits
sequence
electromagnetic
pulses
response
transmit
nominal
samples
echoes
field
controlled
receive
generates
sample
circuit
supplies
relative
modulated
delay
causing
time
transmissions
modulation
executed
modulating
drives
circuitry
controls
strobe
amplitude
center
related
width
signals
preferably
one-quarter
wavelength
radar motion
wide band
impulse radar
pulse timing
receive timing
sample signal
pulse repetition
electromagnetic pulses
timing signal
pulse width
timing circuit
intermediate frequency
repetition frequency
transmit timing
motion sensor
quarter wavelength
micro-power impulse
transmitted pulse
timing signals
received pulse
receiver samples
one-quarter wavelength
frequency related
transmitted signal
ultra-wide band
controlled timing
band radar
circuit supplies
magnetic pulse
pulse radar
electromagnetic pulse
rf receiver
quarter wave
delay circuit
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