Navigation system using external monitoring
First Claim
1. A local area augmentation navigation system for determining the authenticity of the LAAS signal transmitted from a VDB transmitter, the system comprising:
- at least one reference station at a known location, each reference station receiving a GPS signal from a GPS constellation and collecting and outputting pseudo-range data from the GPS signal;
a master station receiving the pseudo-range data from the at least one reference station, the master station forming a correction message from the pseudo-range data and the known location of the at least one reference station, the master station broadcasting the correction message;
at least one monitoring receiver at a known location receiving GPS signals from the GPS constellation and receiving the correction message broadcast by the master station;
wherein the monitoring receiver communicates with the master station to verify the authenticity of the correction message broadcast by the master station and monitor the OPS satellite integrity in field; and
,a LAAS receiver receiving the correction message broadcast by the master station as well as a GPS signal from the GPS constellation and calculating the location of the LAAS receiver with the correction message and the GPS signal.
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Accused Products
Abstract
A local area augmentation navigation system for determining the authenticity of the GPS signal. The system is provided with at least one reference station at a known location, a master station, a monitoring receiver, and a LAAS receiver. Each reference station receives a GPS signal from a GPS constellation and collects and outputs pseudo-range data from the GPS signal. The master station receives the pseudo-range data from the reference stations. The master station forms a correction message from the pseudo-range data and the known locations of the reference station. The master station broadcasts the correction message. The monitoring receiver receives the GPS signal from the GPS constellation and the correction message to determine the accuracy of at least one of the broadcasted correction message and the GPS signal. The LAAS receiver receives the correction message broadcast by the master station as well as a GPS signal from the GPS constellation and calculates the location of the LAAS receiver with the correction message and the GPS signal.
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Citations
29 Claims
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1. A local area augmentation navigation system for determining the authenticity of the LAAS signal transmitted from a VDB transmitter, the system comprising:
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at least one reference station at a known location, each reference station receiving a GPS signal from a GPS constellation and collecting and outputting pseudo-range data from the GPS signal; a master station receiving the pseudo-range data from the at least one reference station, the master station forming a correction message from the pseudo-range data and the known location of the at least one reference station, the master station broadcasting the correction message; at least one monitoring receiver at a known location receiving GPS signals from the GPS constellation and receiving the correction message broadcast by the master station;
wherein the monitoring receiver communicates with the master station to verify the authenticity of the correction message broadcast by the master station and monitor the OPS satellite integrity in field; and
,a LAAS receiver receiving the correction message broadcast by the master station as well as a GPS signal from the GPS constellation and calculating the location of the LAAS receiver with the correction message and the GPS signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification