Differential ground station repeater
First Claim
1. A differential global position system for use in determining one or more parameters of an object with respect to earth by use of information transmitted to the object from a plurality of satellites which information may contain errors due to path distortions, comprising:
- a ground receiving station fixed to earth at a known location and including a receiver to receive the information from the satellites and a microprocessor to determine the error information due to path distortion;
first transmitter means located at a first position remote from the receiver and connected thereto to receiver the error information and to transmit it to the object in a transmission at a first frequency with a first characteristic; and
second transmitter means located at a second position remote from the first transmitter means and the receiver and connected to the receiver to receive the error information and to transmit it to the object in a transmission at the first frequency with a second characteristic distinguishable from the first characteristic, so that the transmissions are individually distinguishable.
1 Assignment
0 Petitions
Accused Products
Abstract
A differential ground station repeater in which a plurality of transmitters are utilized to relay information to an aircraft from a single ground station situated to receive satellite information and to transmit the satellite and other information to the plurality of correction transmitters in which the transmitters utilize a single frequency but transmit at different described sub-time slots so that the aircraft may utilize the signal of any of the transmitters it may be receiving signals.
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Citations
13 Claims
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1. A differential global position system for use in determining one or more parameters of an object with respect to earth by use of information transmitted to the object from a plurality of satellites which information may contain errors due to path distortions, comprising:
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a ground receiving station fixed to earth at a known location and including a receiver to receive the information from the satellites and a microprocessor to determine the error information due to path distortion; first transmitter means located at a first position remote from the receiver and connected thereto to receiver the error information and to transmit it to the object in a transmission at a first frequency with a first characteristic; and second transmitter means located at a second position remote from the first transmitter means and the receiver and connected to the receiver to receive the error information and to transmit it to the object in a transmission at the first frequency with a second characteristic distinguishable from the first characteristic, so that the transmissions are individually distinguishable. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A process for use with a differential global position system in which information from a plurality of satellites is received at a ground station and processed to determine any errors therein and the processed information being transmitted to aircraft within transmission range of the ground station, an improvement permitting transmission of the processed information over a single frequency from several locations remote from the ground station and from each other all within the transmission range comprising the steps of:
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A. connecting a single ground station to a plurality of transmitters, at least one of which is located at each of the remote locations; B. assigning to each transmitter a separate time slot for the transmission of the processed information; and C. causing each transmitter to transmit the processed information at the single frequency only during its assigned time slot. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification