Integrated Satellite Constellation Reducing Time to First Fix
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Solution Overview
Problem
Current satellite navigation systems face challenges in reducing the time to first fix (TTFF) in hot and snap start modes, particularly due to the limitations of existing frequency bands and data transmission rates, which affect the efficiency and accuracy of position tracking.
Innovation Solution
The integration of a third carrier frequency (L1 frequency) into the Indian regional navigational satellite system (IRNSS) and the global positioning system (GPS) aided geo-augmented navigation system (GAGAN) to create an integrated satellite constellation system, which parallelly transmits sub-frames of navigation data over L5, S1, and L1 frequencies, reducing the time to first fix by enabling simultaneous acquisition of ephemeris, ionospheric, and UTC data across multiple frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If satellite navigation systems use existing frequency bands (L5, S1) with current data transmission rates, then system compatibility and coverage are maintained, but the time to first fix (TTFF) is prolonged
Solution Approach 1:
The patent merges the Indian Regional Navigational Satellite System (IRNSS) with the GPS Aided Geo-Augmented Navigation (GAGAN) system to create an integrated constellation. This combination allows the system to utilize both L5/S1 frequencies from IRNSS and L1 frequency from GAGAN simultaneously, enabling parallel data transmission channels that reduce TTFF without requiring a completely new system architecture
Solution Approach 2:
The patent introduces a third carrier frequency (L1) in addition to the existing L5 and S1 frequencies, adding a dimensional aspect to the signal transmission. This multi-frequency approach creates additional pathways for navigation data transmission, allowing the receiver to acquire ephemeris, ionospheric, and UTC data through multiple channels simultaneously, thereby reducing the time to first fix
2Productivity
If a third carrier frequency (L1) is integrated into the satellite constellation, then the time to first fix is reduced through parallel data transmission, but the device complexity increases
Solution Approach 1:
The integrated satellite constellation is designed to provide multi-functional service across three frequency bands. The same satellite infrastructure delivers navigation data on L5, S1, and L1 frequencies simultaneously, allowing a single receiver to access multiple data channels without requiring separate dedicated systems for each frequency, thus improving productivity while managing complexity through universal design
Data Source
AI summary
A method and a system for reducing time to first fix (TTFF) in a satellite navigation receiver (SNR) includes constructing an integrated satellite constellation system (ISCS) for transmitting navigation signals over a combination of a first carrier frequency, a second carrier frequency, and a third carrier frequency. The ISCS includes a predetermined number of geosynchronous satellites positioned at first predetermined geographic coordinates in a geosynchronous orbit and a predetermined number of geostationary satellites positioned at second predetermined geographic coordinates in a geostationary orbit. The ISCS transmits navigation data to the SNR over the combination of the first carrier frequency, the second carrier frequency, and the third carrier frequency in reduced time, thereby reducing the TTFF in the SNR. The method and the system also reduce TTFF in a hot start mode and a snap start mode of the SNR by utilizing the third carrier frequency as a data channel.