METHOD AND APPARATUS FOR IMPROVING ACCURACY AND/OR INTEGRITY OF LONG-TERM-ORBIT INFORMATION FOR A GLOBAL-NAVIGATION-SATELLITE SYSTEM
First Claim
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1. A method, comprising:
- obtaining long-term-orbit information having a first period of validity, wherein the first period of validity is an amount of time greater than a period of validity for ephemeris broadcast from at least one satellite of a constellation of satellites; and
truncating the long-term-orbit information as a function of time so as to form truncated long-term-orbit information having a second period of validity, wherein the second period of validity is shorter than the first period of validity.
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Abstract
A method and apparatus for monitoring a configuration of satellites to maintain integrity of LTO information in a GNSS receiver of a GNSS or other positioning system is described. The method may include obtaining broadcast ephemeris transmitted from at least one satellite of a constellation of satellites; comparing the broadcast ephemeris to long-term-orbit information available to a global-navigation-satellite receiver; and causing the global-navigation-satellite receiver to not use the long-term-orbit information when the long-term-orbit information does not correspond to the broadcast ephemeris.
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Citations
25 Claims
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1. A method, comprising:
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obtaining long-term-orbit information having a first period of validity, wherein the first period of validity is an amount of time greater than a period of validity for ephemeris broadcast from at least one satellite of a constellation of satellites; and truncating the long-term-orbit information as a function of time so as to form truncated long-term-orbit information having a second period of validity, wherein the second period of validity is shorter than the first period of validity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A server comprising:
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memory adapted to store executable instructions to; obtain long-term-orbit information having a first period of validity, wherein the first period of validity is an amount of time greater than a period of validity for ephemeris broadcast from at least one satellite of a constellation of satellites; and truncate the long-term orbit information as a function of time so as to form truncated long-term-orbit information having a second period of validity, wherein the second period of validity is shorter than the first period of validity; and a processor adapted to obtain the executable instruction from memory, and to execute the executable instructions. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A tangible computer accessible medium comprising executable instructions, wherein the executable instructions are computer-executable to implement:
- obtaining long-term-orbit information having a first period of validity, wherein the first period of validity is an amount of time greater than a period of validity for ephemeris broadcast from at least one satellite of a constellation of satellites; and
truncating the long-term-orbit information as a function of time so as to form truncated long-term-orbit information having a second period of validity, wherein the second period of validity is shorter than the first period of validity. - View Dependent Claims (24, 25)
- obtaining long-term-orbit information having a first period of validity, wherein the first period of validity is an amount of time greater than a period of validity for ephemeris broadcast from at least one satellite of a constellation of satellites; and
Specification