Satellite Navigation Message Format Description Device
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Solution Overview
Problem
Existing satellite navigation systems face challenges in updating message formats without compromising compatibility with existing navigation receivers, as changes often require broadcasting multiple signals, which is costly and resource-intensive, or result in reduced service quality for older receivers.
Innovation Solution
A device generates 'description' messages that outline the format of future messages, allowing navigation receivers to store and reconfigure for new formats before they are implemented, ensuring immediate understanding and use of new message formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the message format is modified to implement new services or correct problems, then the navigation system functionality is improved, but existing navigation receivers become incompatible with the new format
Solution Approach 1:
The invention applies preliminary action by broadcasting a description message that contains the future message format definition before the actual format change is implemented. This allows navigation receivers to pre-configure themselves with the new format parameters (such as data field associations, parameter types, and representations) in advance, ensuring seamless compatibility when the format transition occurs. The description message is transmitted well before the implementation date, giving receivers sufficient time to update their internal interfaces without service interruption.
2Adaptability or versatility
If a new dedicated signal is added to support new message formats, then new generation receivers can understand the messages effectively, but the broadcasting cost and resource consumption increase significantly
Solution Approach 1:
The invention applies universality by using a single existing signal to serve multiple functions: it continues to carry traditional navigation messages for legacy receivers while simultaneously broadcasting description messages that define future formats for new generation receivers. The description message itself is a universal data structure that can describe any future message format without requiring a dedicated new signal. This multi-functional approach eliminates the need for separate dedicated signals, reducing resource consumption while maintaining support for both old and new receiver types.
3Adaptability or versatility
If a new signal on a different frequency is added to support new message formats, then new generation receivers can use improved services, but the service quality for older generation receivers is significantly reduced
Solution Approach 1:
The invention applies merging by combining the broadcasting of traditional navigation messages and future format description messages on the same signal and frequency. The description message is integrated into the existing message stream, allowing legacy receivers to continue receiving and processing traditional messages without any degradation in service quality. New generation receivers can simultaneously receive the same traditional messages plus the additional description message, enabling them to access both legacy and enhanced services from a single signal without forcing older receivers to switch frequencies or suffer service reduction.
Data Source
AI summary
A device is dedicated to generating messages relating to at least one satellite navigation system and to be sent to navigation receivers. This device comprises processor means responsible for generating “description” messages to be broadcast to the navigation receivers from a chosen date and comprising a description of a format of future messages to be broadcast to the navigation receivers from a date after the chosen date.