Systems and methods for real time carrier phase monitoring
First Claim
1. A method comprising:
- receiving data from a plurality of receivers on a platform, wherein the data corresponds to one or more satellite-receiver tracks, each of the one or more satellite-receiver tracks having an error bound;
generating an attitude correction for the platform based on the received data;
determining a convergence test statistic of the attitude correction;
determining a convergence level of the attitude correction using the convergence test statistic; and
responsive to the determination, monitoring a carrier phase error of signals received from the one or more satellite-receiver tracks, wherein monitoring the carrier phase error comprises;
determining excluded satellite-receiver tracks having a carrier phase error greater than or equal to a carrier phase error threshold;
monitoring the satellite-receiver tracks based on convergence level of the excluded satellite-receiver tracks and using the error bounds of the excluded satellite-receiver tracks when generating the attitude correction.
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Accused Products
Abstract
The concepts, systems and methods described herein are directed towards real time carrier phase monitoring and platform attitude solutions on a moving platform. In an embodiment, highly accurate platform attitude and monitored carrier phases can be determined in a single step and use data screening, error bounds inflation and statistical tests to ensure both inputs and outputs of an attitude solution are self-consistent. The method includes determining a carrier phase error level for each of the satellite-receiver tracks, identifying the satellite-receiver tracks having the carrier phase error level greater than or equal to a carrier phase error threshold, generating an attitude correction using the received data from the one or more satellite-receiver tracks having the carrier phase error level less than the carrier phase error threshold and determining a convergence state of the attitude correction. The carrier phase monitoring may be activated or dis-activated based on the convergence level.
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Citations
20 Claims
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1. A method comprising:
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receiving data from a plurality of receivers on a platform, wherein the data corresponds to one or more satellite-receiver tracks, each of the one or more satellite-receiver tracks having an error bound; generating an attitude correction for the platform based on the received data; determining a convergence test statistic of the attitude correction; determining a convergence level of the attitude correction using the convergence test statistic; and responsive to the determination, monitoring a carrier phase error of signals received from the one or more satellite-receiver tracks, wherein monitoring the carrier phase error comprises; determining excluded satellite-receiver tracks having a carrier phase error greater than or equal to a carrier phase error threshold; monitoring the satellite-receiver tracks based on convergence level of the excluded satellite-receiver tracks and using the error bounds of the excluded satellite-receiver tracks when generating the attitude correction. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method comprising:
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receiving data from a plurality of receivers on a platform, wherein the data corresponds to one or more satellite-receiver tracks; determining a carrier phase error level for each of the satellite-receiver tracks; identifying the satellite-receiver tracks having the carrier phase error level greater than or equal to a carrier phase error threshold; generating an attitude correction for the platform using the received data from the one or more satellite-receiver tracks having the carrier phase error level less than the carrier phase error threshold; determining a convergence state of the attitude correction; and updating carrier phase error level bounds for the one or more satellite-receiver tracks based on attitude observable residuals. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A system comprising:
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a pre-screen module configured to receive data from a plurality of receivers on a moving platform, wherein the data corresponds to one or more satellite-receiver tracks, each of the one or more satellite-receiver tracks having an error bound obtained over a period of time or at initialization; a real time attitude determination (RTAD) module coupled to the pre-screen module, the RTAD module configured to generate an attitude correction based on attitude observables formed by the received data and attitude observable error bounds corresponding to error bounds for the one or more satellite-receiver tracks and calculate attitude observables residuals using the attitude correction; and a post-screen module coupled to the RTAD module and the pre-screen module, wherein the post-screen module is configured to test a consistency between the error bounds for the one or more satellite-receiver tracks and the attitude observables residuals and responsive to the testing, update the error bounds for the one or more satellite-receiver tracks based on the attitude observable residuals. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification