Watchdog Code Injection for Fresh Sensor Data Streams
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Solution Overview
Problem
Lidar systems face the risk of unsafe conditions due to data stagnation, where repeated use of previous data instead of fresh updates can lead to incorrect object detection or failure to respond to changing conditions, particularly in critical applications like automotive and aerospace.
Innovation Solution
A data-stream watchdog system is introduced, which includes a sensor system, memory structure, watchdog code generator, data transmission system, data receiver system, receive buffer, and watchdog code checker. This system embeds a periodically updating watchdog code into the sequential data, allowing for real-time verification of data freshness and detection of errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If data is continuously refreshed in lidar systems, then object detection accuracy is improved, but system complexity increases due to the need for watchdog verification mechanisms
Solution Approach 1:
A watchdog code is introduced as an intermediary element that is embedded within the data stream. This code acts as a mediator between the data generation process and the verification process, enabling automatic detection of data stagnation without requiring complex external monitoring systems. The watchdog code is a simple binary sequence that toggles between 0 and 1, providing an lightweight verification mechanism.
Solution Approach 2:
The watchdog code is generated and embedded in advance into the data stream before transmission. This preliminary action ensures that verification capability is built into the data structure itself, eliminating the need for separate verification processes and reducing overall system complexity while maintaining detection accuracy.
2Reliability
If watchdog code verification is implemented, then data freshness is ensured, but data transmission time increases due to additional verification steps
Solution Approach 1:
The watchdog verification process is merged with the existing data transmission and processing pipeline. The watchdog code is embedded alongside the actual data bits, and verification occurs concurrently with data reception and processing, rather than as a separate sequential step. This integration ensures data freshness while minimizing additional time overhead.
Solution Approach 2:
The verification process checks only the critical watchdog code bits rather than validating the entire data stream. This partial verification approach provides sufficient assurance of data freshness without the computational overhead of comprehensive data validation, thus reducing time loss while maintaining reliability.
3Quantity of substance
If sequential data is stored on a repeating cycle, then data storage efficiency is improved, but risk of data stagnation increases
Solution Approach 1:
A feedback mechanism is implemented where the watchdog code provides continuous information about the freshness status of stored data. The receiving system monitors the watchdog code and can detect when data has stagnated or failed to update, providing real-time feedback that enables corrective actions. This feedback loop maintains reliability while preserving the storage efficiency benefits of cyclic data updating.
Solution Approach 2:
The watchdog code acts as an indicator that changes state (like a color change) to signal the freshness status of data. When the watchdog code transitions from its expected toggling pattern to a stagnant state, it visually (in binary form) indicates that data refresh has failed, enabling easy detection of data stagnation without affecting storage efficiency.
Data Source
AI summary
Systems, methods, and circuits utilize one or multiple data-stream watchdog codes for verifying a temporal state of data from a sensor system. A data-stream watchdog system can includes a sensor system configured to detect physical phenomena and produce corresponding output signals; a memory structure configured to store the output signals as sequential data on a repeating cycle, a watchdog code generator configured to insert a watchdog code into the stored sequential data and update the watchdog code periodically, and a data transmitter configured to receive the sequential data with included watchdog code from the memory structure and transmit the sequential data with the included watchdog code over a physical data channel each cycle of the repeating cycle. An application system receives the data and a watchdog code checker checks whether the watchdog code in the sequential data is correct and produces an error indication when the watchdog code is incorrect.