Use of geo-stationary satellites to augment wide_area multilateration synchronization
First Claim
Patent Images
1. A method to enhance multilateration synchronization, comprising the steps of:
- receiving, from at least one satellite, at least one timing source, receiving from a vehicle, a radio signal at a plurality of receiver locations, time-stamping the received radio signal with a time-stamp derived at least in part from the at least one timing source, and determining vehicle position from the time difference of arrival of the radio signal time stamps.
6 Assignments
0 Petitions
Accused Products
Abstract
The present invention improves WAMLAT Timing Availability by using timing from one or more of a variety of sources. These sources include unaugmented SATNAV timing, from GPS or/and GALILEO, GEO timing from pseudo SATNAV signals, additional GEO timing for non SATNAV applications, timing derived from both terrestrial and satellite television and radio transmissions, and stable on board oscillators to withstand short term interruptions in satellite timing. The use of one or more of these multiple sources of timing improves accuracy and reliability of wide area multilateration systems.
-
Citations
32 Claims
-
1. A method to enhance multilateration synchronization, comprising the steps of:
-
receiving, from at least one satellite, at least one timing source, receiving from a vehicle, a radio signal at a plurality of receiver locations, time-stamping the received radio signal with a time-stamp derived at least in part from the at least one timing source, and determining vehicle position from the time difference of arrival of the radio signal time stamps. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A tracking apparatus, comprising:
-
a satellite receiver for receiving, from at least one satellite, at least one timing source, at least one radio receiver for receiving from a vehicle, a radio signal at a plurality of radio receiver locations, at least one time-stamp generator, each at a corresponding at least one radio receiver, for timer-stamping the received radio signal with a time-stamp derived at least in part from the at least one timing source, and a tracking computer for determining a position of a radio signal source from the time difference of arrival of the radio signal time stamps. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A tracking apparatus, comprising:
-
a satellite receiver for receiving, from at least one satellite, at least one timing source, at least one of a television receiver for receiving television signals from a plurality of stationary transmitters or satellites for timing purposes and a broadcast radio receiver for receiving radio signals from a plurality of stationary transmitters or satellites for timing purposes, at least one radio receiver for receiving from a vehicle, a radio signal at a plurality of radio receiver locations, at least one time-stamp generator, each at a corresponding at least one radio receiver, for timer-stamping the received radio signal with a time-stamp derived at least in part from the at least one timing source, and a tracking computer for determining a position of a radio signal source from the time difference of arrival of the radio signal time stamps. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
-
Specification