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US 6,651,028 B2Granted
Multi-purpose sensor and data link
AssigneeOtis Elevator Company
InventorsLester H. Kosowsky, Richard Gryzbowski
Life of this patent
Estimating the term…
Abstract
Modulating digital data onto a carrier frequency and then amplitude modulating the result with a waveform of a different frequency permits measuring position and velocity of an elevator cab while transmitting digital data to the cab.
Claims8
A method for determining a range and a velocity of an object compared to a station while communicating data therebetween, comprising the steps of:
- providing a reflector on said object;
- modulating digital data at said station onto a first waveform using one of phase modulation and frequency modulation to produce a first output;
- amplitude modulating said first output with a second waveform to produce a second output comprising a carrier-no-carrier signal;
- transmitting said second output from said station to said object;
- generating a return signal by reflecting a first portion of said second output from said reflector;
- receiving said return signal at said station and processing said return signal to obtain said range and said velocity of said object;
- and
- processing a second portion of said second output at said object to recover said digital data modulated onto said first waveform at said station.
5 more elements
A system for determining a range and a velocity of an object compared to a station and for communicating data therebetween, comprising:
- reflector disposed on said object for reflecting a signal;
- a first modulator for modulating digital data at said station onto a first waveform using one of phase modulation and frequency modulation to produce a first output;
- a second modulator for amplitude modulating said first output with a second waveform to produce a second output comprising a carrier-on-carrier signal;
- a transmitter for transmitting said second output from said station to said object;
- a receiver at said station for receiving a return signal comprising a reflected first portion of said second output and processing said return signal to obtain said range and said velocity of said object;
- and
- a processor for processing a second portion of said second output at said object to recover said digital data modulated onto said first waveform at said station.
4 more elements
Dependencies are inferred from the claim text.