Ranging Signal Encoding for Secure Navigation Backup
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Solution Overview
Problem
The existing eLoran navigation systems face challenges such as over-dependence on GPS, vulnerability to jamming and spoofing, and a need for improved data transfer rates and access control, which necessitate a backup or replacement system with enhanced security and accuracy.
Innovation Solution
The proposed solution involves encoding data in encoding delays between pulses of a pulse group, using a pulse-phase-signature schedule, and implementing dithering schedules to limit unauthorized use, while also improving forward error correction techniques and identifying transmitters within the pulse groups to enhance the integrity of ranging signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If eLoran navigation systems are implemented as a backup to GPS, then reliability is improved, but device complexity increases
Solution Approach 1:
The navigation system is segmented into multiple independent transmitters distributed geographically, each capable of providing positioning, navigation, and timing services. This segmentation allows the system to maintain reliability through redundancy while managing complexity by dividing the overall system into manageable, standardized units that can operate independently.
2Productivity
If data transfer rates are increased in the navigation system, then productivity is improved, but loss of information increases due to potential errors
Solution Approach 1:
The system incorporates feedback mechanisms where transmitters receive and process data messages containing navigation and timing information, then retransmit this processed information. This feedback loop ensures data integrity by verifying and correcting transmissions, allowing increased data transfer rates without proportionally increasing error rates.
Solution Approach 2:
Data messages are prepared and validated before transmission, with preliminary error checking and coding applied. This preliminary action ensures that only verified data is transmitted at high rates, reducing the likelihood of information loss while maintaining high productivity.
3Reliability
If access control is implemented to limit unauthorized use, then security is improved, but ease of operation decreases
Solution Approach 1:
Access control is implemented with local quality by providing different levels of access to different users or systems. Authorized receivers can fully utilize the navigation services, while unauthorized systems are limited or blocked. This differentiated approach maintains security while preserving ease of operation for legitimate users.
Data Source
AI summary
A device is disclosed. In one or more examples, the device may include an antenna to receive a signal comprising a ranging signal and a data signal. The signal may encode timing information for one or more of positioning, navigation, and timing. The signal may include a first pulse having a first start time and a second pulse having a second start time. The second start time may be an integer number of inter-pulse intervals plus an encoding delay after the first start time. The encoding delay may encode data. The device may include a processor to obtain the data responsive to the encoding delay.