Satellite Terminal Location Derivation in GNSS-Denied Motion
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Solution Overview
Problem
Global Navigation Satellite System (GNSS) signals can be interfered with or obstructed, leading to GNSS denial or degradation situations where position, velocity, and timing signals are unavailable, preventing accurate location determination.
Innovation Solution
A satellite terminal equipped with an antenna aperture and computing device executes an inversion algorithm using complementary sensors and ephemeris data to derive location, which is then used to create a transcoded signal for embedded GNSS receivers, enabling communication even in GNSS-denied environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GNSS signals are used for location determination, then location accuracy is improved, but reliability deteriorates in jammed or obstructed conditions
Solution Approach 1:
The patent introduces an intermediary system consisting of a satellite terminal with an antenna aperture that receives signals from communication satellites (not GNSS satellites). This intermediary system derives location information through signal processing and inversion algorithms, acting as a mediator between the GNSS-denied environment and the need for accurate location determination. The transcoder then converts this derived location into GNSS-compatible format for embedded receivers.
Solution Approach 2:
The patent creates a copy of GNSS functionality by generating a transcoded signal that replicates GNSS signal characteristics. The transcoder produces a synthetic GNSS signal containing derived location, velocity, and timing information, allowing embedded GNSS receivers to operate without actual GNSS satellites. This copying approach enables GNSS-like operation in GNSS-denied environments.
2Reliability
If inversion algorithm is executed to derive location, then reliability in GNSS-denied conditions is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary actions by pre-storing ephemeris data and communication satellite orbit information in the satellite terminal before GNSS denial occurs. The inversion algorithm uses these pre-available data structures to compute location derivatives, reducing the computational burden during actual GNSS-denied operation. The system prepares reference frames and orbital parameters in advance to facilitate rapid location derivation when needed.
3Adaptability or versatility
If transcoder creates transcoded signal using derived location, then adaptability to GNSS-denied environments is improved, but loss of information may occur
Solution Approach 1:
The patent implements feedback mechanisms where the satellite terminal continuously monitors signal quality and compares derived location accuracy against available reference data. The system adjusts the inversion algorithm parameters and transcoder output based on feedback from signal strength measurements and orbital data updates. This feedback loop ensures that the transcoded signal maintains maximum accuracy while adapting to changing operational conditions.
Data Source
AI summary
A position, navigation, and timing (PNT) system, a satellite terminal and methods for using the same are disclosed. In some embodiments, a satellite terminal includes an antenna aperture and a computing device. The computing device is operable to execute an inversion algorithm to derive a location of the satellite terminal. This can be used when an external reference to its location is not available. The satellite terminal also includes a transcoder to create a transcoded signal using the location and a modem communicably coupled to the transcoder and the antenna aperture to receive the transcoded signal.