Troposphere corrections for ground based positioning systems
First Claim
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1. A method for troposphere corrections in a positioning system with a ground based transmitter, the method comprising:
- estimating a range as a function of a signal from the ground based transmitter, the signal;
(a) having an X-band or ISM-band carrier frequency;
(b) having a modulation rate of code being at least about 30 MHz;
or(c) having both the X-band or ISM-band carrier frequency and the modulation rate of the code being at least about 30 MHz; and
applying a troposphere correction to the range.
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Abstract
Troposphere corrections are provided in a land based transmitter-positioning system. Troposphere delays correct ranges based on X- or ISM-band carrier ranging signals with a modulation rate of the code of at least about 30 MHz. Ground based transmitters transmit non-GPS type ranging signals, and the receivers correct for troposphere delays. Troposphere delay corrections are applied to range estimates on each iteration of an iterative position-fix algorithm. Different models of troposphere corrections in a ground based ranging system may be used.
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Citations
26 Claims
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1. A method for troposphere corrections in a positioning system with a ground based transmitter, the method comprising:
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estimating a range as a function of a signal from the ground based transmitter, the signal; (a) having an X-band or ISM-band carrier frequency; (b) having a modulation rate of code being at least about 30 MHz;
or(c) having both the X-band or ISM-band carrier frequency and the modulation rate of the code being at least about 30 MHz; and applying a troposphere correction to the range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. In a computer readable storage medium having stored therein data representing instructions executable by a programmed processor of a receiver for troposphere corrections in a positioning system with a ground based transmitter, the storage medium comprising instructions for:
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estimating a range as a function of a signal from the ground based transmitter, the signal having an X-band or ISM-band carrier frequency and a modulation rate of code being at least about 30 MHz; and applying a troposphere correction to the range. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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Specification