Pulse Signal Encoding for Secure Navigation and Data
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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 limited data transfer rates, necessitating a backup or replacement system with enhanced security and communication capabilities.
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 enhance security and accuracy, while also improving forward error correction techniques and transmitter identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS is used for navigation and positioning, then positioning accuracy and data transfer rates are improved, but vulnerability to jamming and spoofing increases
Solution Approach 1:
The patent introduces LORAN-C radio wave signals as an intermediary backup system to GPS. The terrestrial LORAN-C transmitters broadcast timing signals that receivers can use for positioning and navigation, providing an alternative path that does not rely on satellite signals vulnerable to jamming and spoofing.
Solution Approach 2:
The patent encodes data in the timing signals by varying parameters such as pulse position, pulse width, or signal phase. This allows multiple functions (positioning, navigation, timing, and data transfer) to be achieved through a single signal infrastructure, improving reliability while maintaining accuracy.
2Reliability
If LORAN-C signals are used for positioning and navigation, then immunity to jamming and spoofing is improved, but data transfer rates are reduced
Solution Approach 1:
The patent makes the LORAN-C timing signals multi-functional by encoding various types of data (positioning information, navigation data, timing signals, and additional communication data) within the same signal framework. This allows the system to provide robust anti-jamming positioning while simultaneously achieving enhanced data transfer capabilities through techniques like pulse position modulation and coded sequences.
3Productivity
If data is encoded in pulse timing signals, then data transfer rates are improved, but signal complexity increases
Solution Approach 1:
The patent uses periodic pulse trains with regular intervals as the basis for signal encoding. Data is embedded by systematically varying the position, width, or phase of pulses within each periodic cycle. This periodic structure provides a predictable framework that simplifies both transmission and reception, allowing high data rates without excessive complexity.
Solution Approach 2:
The patent establishes predetermined coding schemes and synchronization protocols before data transmission begins. Receivers are pre-configured with knowledge of expected pulse patterns, timing intervals, and encoding formats, which simplifies the real-time decoding process and reduces the complexity of signal processing required during operation.
Data Source
AI summary
A method is disclosed. In various examples, the method may include receiving an instruction for generating a signal that comprises a ranging signal and a data signal, and transmitting the signal at least partially responsive to the instruction. In various examples the signal may be transmitted via a terrestrial transmitter for transmitting radio waves having encoded messaging information and timing information for one or more of positioning, navigation and timing. In various examples, the signal may include a pulse group comprising 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.