Method and system for radiolocation asset tracking via a mesh network
AssigneeZaiNar, Inc.
InventorsPhilip A. Kratz, Daniel Jacker
Life of this patent
Estimating the term…
Abstract
A method of determining a reference clock in a mesh network includes receiving multiple signals, correlating the multiple signals with a local signal generated by the first node to determine a coarse set of time differences, refining the coarse set of time differences using a phase of a carrier signal of the multiple signals to produce a refined set of time differences, and using the refined set of time differences to define a reference clock.
Claims7
A method of determining a reference clock for use in a mesh network, comprising:
- generating, at the first node, a local signal;
- receiving, at a first node in the mesh network, multiple signals from a second node in the mesh network;
- demodulating the local signal to locate a local signal peak;
- demodulating the multiple signals to locate multiple signal peaks;
- correlating, at the first node, the local signal peak and the multiple signal peaks to determine an offset for the second node;
- determining a coarse set of time differences using the offset for the second node;
- refining the coarse set of time differences using a phase of a carrier signal of the multiple signals to produce a refined set of time differences;
- and
- using the refined set of time differences to define the reference clock for use in the mesh network.
A method of determining a reference clock for use in a mesh network:
- receiving, at a first node in the mesh network, multiple signals from a second node in the mesh network;
- correlating, at the first node, the multiple signals with a local signal generated by the first node to determine a coarse set of time differences;
- determining a frequency and phase of the carrier signal;
- using the frequency and phase of the carrier signal to determine a fractional offset between carrier signal and the coarse set of time differences;
- and
- using the fractional offset to adjust the coarse set of differences to a higher level of precision than the coarse set of differences to produce a refined set of time differences;
- and
- using the refined set of time differences to define the reference clock for use in the mesh network.
A method of determining a reference clock for use in a mesh network:
- receiving, at a first node in the mesh network, multiple signals from a second node in the mesh network;
- receiving, at the first node in the mesh network, multiple signals from a third node in the mesh network;
- correlating, at the first node, the multiple signals from the second node and the multiple signals from the third node with a local signal generated by the first node to determine a coarse set of time differences;
- refining the coarse set of time differences using a phase of a carrier signal of the multiple signals from the second node and a phase of a carrier signal of the multiple signals from the third node to produce a refined set of time differences;
- and
- using the refined set of time differences to define the reference clock for use in the mesh network.
Dependencies are inferred from the claim text.