SYSTEMS AND METHODS FOR SPACE-TIME DETERMINATIONS WITH REDUCED NETWORK TRAFFIC
First Claim
1. A method of determining location and timing information of a local node in a network, the method comprising:
- receiving pings from a plurality of nodes in the network, each ping comprising;
a transmit count stamp corresponding to a remote time when the respective node transmits the ping, the remote time based on an independent remote clock operating in a respective node; and
a remote location of the respective node at the remote time when the respective node transmits the ping;
for each ping received within a predetermined time interval;
associating a receive count stamp with the received ping, the receive count stamp corresponding to a local time when the ping is received, the local time based on the independent local clock; and
associating a local location with the ping, the local location corresponding to the local time when the ping is received; and
processing the transmit count stamps, the remote locations, the receive count stamps, and the local locations corresponding to the pings received within the predetermined time interval to determine one or more clock solutions for correlating the independent local clock with a network time, and to determine one or more location solutions for estimating a new local location.
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Accused Products
Abstract
Space-time solutions are determined by exchanging pings among nodes in a network. Each ping includes a current space-time state of the transmitting node, which includes the transmitting node'"'"'s currently estimated location and corrected time (as a count stamp). A particular node in the network receives pings from the other nodes in the network and uses the data in the received pings to estimate its own current position and to correct its own free-running clock relative to a common system time. As a service to the network, the particular node then transmits its corrected time (as a count stamp) and estimated position to the other nodes. In some embodiments, the space-time solutions discussed herein are used as backup to other navigation systems, such as the Automatic Dependent Surveillance-Broadcast (ADS-B) system.
57 Citations
15 Claims
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1. A method of determining location and timing information of a local node in a network, the method comprising:
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receiving pings from a plurality of nodes in the network, each ping comprising; a transmit count stamp corresponding to a remote time when the respective node transmits the ping, the remote time based on an independent remote clock operating in a respective node; and a remote location of the respective node at the remote time when the respective node transmits the ping; for each ping received within a predetermined time interval; associating a receive count stamp with the received ping, the receive count stamp corresponding to a local time when the ping is received, the local time based on the independent local clock; and associating a local location with the ping, the local location corresponding to the local time when the ping is received; and processing the transmit count stamps, the remote locations, the receive count stamps, and the local locations corresponding to the pings received within the predetermined time interval to determine one or more clock solutions for correlating the independent local clock with a network time, and to determine one or more location solutions for estimating a new local location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for determining location and timing information, the system comprising:
a plurality of nodes in communication with one another, each node comprising; an independent clock for generating count stamps; a communication device for receiving remote pings from the other nodes, each remote ping including a transmit count stamp and a remote location of a transmitting node; and a processor for; associating each remote ping with a receive count stamp based on the independent clock; associating each remote ping with a local location; and processing the transmit count stamps, the remote locations, the receive count stamps, and the local locations to determine one or more clock solutions for correlating the independent clock with a network time, and to determine one or more location solutions for estimating a new local location. - View Dependent Claims (12, 13, 14, 15)
Specification