Communications: directive radio wave systems and devices (e.g. – With particular circuit
Patent
1999-04-01
2000-06-06
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
342100, 342195, 342199, 331 2, G01S 7483
Patent
active
060724277
ABSTRACT:
Two crystal oscillators are configured as a "plug-and-play" precision transmit-receive clock that requires no calibration during manufacture. A first crystal oscillator generates a transmit clock and a second crystal oscillator operates at a small offset from a harmonic of the first oscillator. A turnstile circuit selects pulses from the second oscillator to trigger a receive clock. Both the transmit and receive clocks operate at the same frequency. One edge of the receive clock is smoothly slipped, or swept, in phase across a limited range such as 0 to 36 degrees relative to the transmit clock with the slip rate set by the harmonic frequency offset. In one embodiment, a quadrature frequency-locked-loop is used to accurately control the slip rate while preventing false frequency locks. This timebase can be used to clock equivalent time radar, laser, and TDR ranging systems with picosecond accuracy. Applications include automotive backup and collision warning radars, precision radar rangefinders for fluid level sensing and robotics, and universal object/obstacle detection and ranging.
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Beffel, Jr. Ernest J.
Sotomayor John B.
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