Superimposed Navigation Authentication Latency Reduction
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Solution Overview
Problem
Current Navigation Message Authentication (NMA) techniques suffer from latency issues due to the need for long authentication tags, which are appended to the navigation message, leading to increased time between authentications (TBA) and poor performance.
Innovation Solution
The proposed solution involves superimposing an authentication tag onto a navigation message and transmitting them simultaneously within the same frequency band, allowing for instantaneous authentication and reducing authentication latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If authentication tags are appended to navigation messages using conventional NMA techniques, then authentication correctness is verified, but authentication latency increases and time between authentications deteriorates
Solution Approach 1:
The patent merges the authentication tag transmission with the navigation message transmission by superimposing the authentication tag onto the navigation message in the time domain. This allows both the navigation message and authentication tag to be transmitted simultaneously within the same time slot and frequency band, eliminating the sequential transmission requirement of conventional NMA techniques and thereby reducing authentication latency while maintaining authentication correctness.
Solution Approach 2:
The patent transitions from conventional time-division multiplexing (where authentication tag and navigation message are transmitted sequentially in different time slots) to a superposition coding approach where both signals are transmitted simultaneously in the same time slot by superimposing them in the signal domain. This dimensional change from sequential time transmission to simultaneous signal superposition reduces the authentication time between completions.
2Reliability
If long authentication tags are used for verification, then authentication security is enhanced, but transmission time increases and productivity decreases
Solution Approach 1:
The patent combines the transmission of the authentication tag with the navigation message by superimposing the tag onto the message signal. This merging allows the authentication tag to be transmitted concurrently with the navigation message rather than sequentially, enabling the system to maintain high authentication security through comprehensive tag verification while improving productivity by eliminating idle transmission time and reducing total authentication cycle time.
3Reliability
If authentication tags are transmitted separately from navigation messages, then verification can be performed, but additional transmission time is required and system complexity increases
Solution Approach 1:
The patent merges the authentication tag transmission with the navigation message transmission by superimposing the tag onto the message in the time domain. This integration allows the receiver to obtain both the navigation message and authentication tag simultaneously from a single transmitted signal, simplifying the transmission protocol by eliminating the need for separate transmission phases and reducing the overall system complexity while maintaining verification capability.
Data Source
AI summary
A system for superimposing a navigation message and an authentication message including a transmitter including a first channel including a first channel encoder for encoding a navigation message; a second channel including a second channel encoder for encoding an authentication message; and a processor; and a memory storing one or more processor-readable instructions. When executed by the processor, the processor-readable instructions cause the transmitter to superimpose the authentication message onto the navigation message to generate a superposition coding and transmit the superposition coding such that the navigation message and the authentication message are transmitted simultaneously at the same frequency.