Method for estimating distance between transmitter and receiver, and transmitter and receiver implementing same
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United States of America Patent
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Jun 12, 2012
Grant Date -
Nov 27, 2008
app pub date -
Dec 20, 2006
filing date -
Dec 23, 2005
priority date (Note) -
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Abstract
A method for estimating the distance between a transmitter and at least one receiver. The transmitter has radio transmission circuitry, at least part of which is operable in a first operation mode for transmitting a first signal type within a first bandwidth and in a second operation mode for transmitting a second signal type including at least a ranging component which occupies a second bandwidth which encompasses and exceeds the first bandwidth. The method includes the steps of: (i) operating part of the radio transmission circuitry in a second operation mode, (ii) transmitting a signal of a second signal type, (iii) receiving a signal on one receiver and (iv) estimating the distance between the transmitter and a receiver from the ranging component in each received signal. A suitable transmitter and receiver for implementing the method are described.
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