eXtremeDB/rt for Automotive Sensor Data Fusion
An ADAS-equipped car is outfitted with many sensors of many types; SONAR, LIDAR, RADAR, optical cameras, GPS and more. These sensors support functions such as traffic sign recognition, lane-keeping (or lane departure warning), adaptive cruise control, parking assist, blind spot detection, collision avoidance and beyond. Let’s not forget internet connectivity for traffic data, maps, and road works.
The view these sensors collectively provide is not static. For example, a car traveling slowly in the city will collapse the information bubble to emphasize points-of-interest, intersections and such. Conversely, a car traveling faster needs to look out farther ahead and, for path prediction, shouldn’t be overly concerned about intersections ahead that the car cannot navigate kinetically because of the nearness of the intersection and the car’s speed.
At its core, this is sensor data fusion. All of this data needs to get to a central location, a database, so that it can be aggregated, correlated, analyzed and acted upon, all in real-time.
Many of these subsystems are time-critical, such as collision avoidance, distance-keeping and path prediction. The logical extension of this is that the database for ADAS systems must be real-time.
A reliable database system built with safety in mind
eXtremeDB/rt is the first commercial-off-the-shelf (COTS) embedded database system to enforce database transaction deadlines, making it uniquely suitable for embedded systems with hard real-time constraints.
Like conventional eXtremeDB, eXtremeDB/rt is an ACID compliant database system that provides services for the storage, retrieval and manipulation of data. The differences lay in the temporal requirements of the managed data, transaction scheduling policies and the timing constraints on transactions.
Watch “Database System Requirements to Achieve Level 3+ Autonomous Driving” presented by McObject at the EETimes Advanced Automotive Tech Forum, or contact us to discuss your project if you need a database for ADAS.
Developers of a real-time database system need to architect the system in such a way that it can guarantee that a transaction will never go past its deadline.
Why should you consider eXtremeDB/rt?
eXtremeDB/rt is founded on eXtremeDB, the first DBMS created specifically for embedded systems, with over 20 years and 10s of millions of systems deployed. eXtremeDB/rt is instrumented to work hand-in-glove with deterministic real-time tasks.
The eXtremeDB/rt kernel — the transaction schedulers, recovery algorithms and the database access API — adjusts to limited operating system services and strives to compensate for their conservative nature by optimizing performance and memory footprint of the database management components.
The eXtremeDB/rt EDF-TM (Earliest Deadline First Transaction Manager) implements a wait-list of transactions, in other words a “transaction queue” in the database kernel. Transaction requests are sorted first on their priority and then within the same priority by deadline.
The Priority Inheritance Transaction Manager exploits the underlying real-time operating system’s scheduling, and may temporarily raise the priority of a thread that is blocking a higher priority thread to let it finish the transaction faster, so it can get out of the way.
"McObject Announces Availability of eXtremeDB/rt for QNX Neutrino RTOS" Electronic Engineering Journal, July 7, 2022
"What is and what isn’t a hard real-time database system?" DB-Engines.com, May 31, 2022
"McObject Announces Availability of eXtremeDB/rt for Green Hills Software’s INTEGRITY RTOS" Embedded Computing Design, April 21, 2022
"Embedded Databases in Real-Time Systems" CircuitCellar.com, March 14, 2022
"McObject and Siemens Embedded Announce Immediate Availability of eXtremeDB/rt for Nucleus RTOS" ODBMS.org, February 23, 2022
"Embedded Executive: Steve Graves, President and CEO, McObject" EmbeddedComputing.com, January, 2022 An interview reviewing key concepts in real-time computing.
"Why your mission-critical application needs a real-time database management system" Logic.nl January 4, 2022
"McObject Announces Availability of eXtremeDB/rt for Microsoft Azure RTOS ThreadX" Electronic Engineering Journal November 11, 2021
"McObject Collaborates with Wind River to Deliver the First-Ever Deterministic Database Systems for VxWorks-based Real-time Embedded Systems" COTS Journal, October, 2021 Please find us on page 8.
"Databases in Hard Real Time" McObject Launches True Real-Time Deterministic Database for embOS Real-time Operating System Applications, Wilmott.com, October 15, 2021
"On eXtremeDB/rt. Q&A with Steven Graves, Real-time analytics has nothing to do with real-time systems." By Roberto Zicari ODBMS.org, October 7, 2021.
"Keeping A Mission-Critical Deterministic DBMS On Time" by McObject CTO Andrei Gorine EmbeddedComputing.com, September 20, 2021
"Real time tasks need real time data" Read the Wind River blog, September 7, 2021