System and method for sensing distance and/or movement

摘要

A method (e.g., a method for measuring a separation distance to a target object) includes transmitting an electromagnetic first transmitted signal from a transmitting antenna toward a target object that is a separated from the transmitting antenna by a separation distance. The first transmitted signal includes a first transmit pattern representative of a first sequence of digital bits. The method also includes receiving a first echo of the first transmitted signal that is reflected off the target object, converting the first echo into a first digitized echo signal, and comparing a first receive pattern representative of a second sequence of digital bits to the first digitized echo signal to determine a time of flight of the first transmitted signal and the echo.

主权项

1. A method comprising:
transmitting an electromagnetic first transmitted signal from a transmitting antenna toward a target object that is a separated from the transmitting antenna by a separation distance, the first transmitted signal including a first transmit pattern representative of a first sequence of digital bits; receiving a first echo of the first transmitted signal that is reflected off the target object; converting the first echo into a first digitized echo signal; comparing a first receive pattern representative of a second sequence of digital bits to the first digitized echo signal to determine a time of flight of the first transmitted signal and the echo; transmitting an electromagnetic second transmitted signal toward the target object, the second transmitted signal including a second transmit pattern representative of a third sequence of digital bits; receiving a second echo of the second transmitted signal that is reflected off the target object; converting the second echo into a baseband echo signal; comparing a second receive pattern representative of a fourth sequence of digital bits that is delayed by the time of flight from the third sequence of digital bits in the second transmit pattern to the baseband echo signal to determine temporal misalignment between one or more waveforms of the baseband echo signal and one or more waveforms of the second receive pattern, the temporal misalignment representative of a time lag between the second receive pattern and the baseband echo signal; and adding the time lag to the time of flight to determine a distance to the target object.