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Module claims to be deadly accurate for positioning

In-vehicle navigation and tracking devices can operate simply perched on the dashboard and connected to vehicle power

Telit says the module has outperformed competitors in a wide range of tests
Telit says the module has outperformed competitors in a wide range of tests

Module enables power-and-go navigation systems

Telit has introduced a GNSS module which leverages information from internal gyros, accelerometers and a barometric pressure sensor to perform ‘dead reckoning’ (DR) navigation for use in areas like track and trace and in-vehicle systems.


According to the wireless machine-to-machine provider, the SL869-3DR module, intended for global use, delivers accurate position data either directly from its multi-constellation receiver or from a fully autonomous DR system, requiring no connections to external devices or components other than an antenna for satellite signal reception and power.


The module allows integrators to design zero-installation, in-vehicle navigation and tracking devices for fleets and other commercial or consumer applications that operate simply perched on the dashboard and connected only to vehicle power.


“A significant number of the millions of commercial vehicles and fleets on the roads today are still operating with no or unreliable navigation systems because installation costs to connect the device to vehicle sensors are too high and require very specialised skills,” said Felix Marchal, executive vice president of GNSS and short range wireless, Telit.


“With the SL869-3DR we overcome that barrier because it enables devices that you simply connect to vehicle power and go. Until now, ‘power-and-go’ navigation systems have largely relied on open-sky visibility, which is not typically where most commercial fleets operate. They are moving through tunnels, urban canyons and other environments where these systems cannot produce a position solution.”


The SL869-3DR is a flash-memory based module capable of tracking three constellations simultaneously. The module integrates an array of micro electromechanical system (MEMS) designed to provide it seven degrees of freedom.


Telit’s MEMS-only Dead Reckoning (MoDR) solution ensures that reliable position, velocity and time (PVT) information is constantly available to the host application even when GNSS coverage is compromised, without the need for connection to the vehicle for wheel-ticks for speed or reverse-gear data, the company said.


The SL869-3DR is designed to support GPS, QZSS, GLONASS, Beidou and is Galileo ready. It integrates an embedded array of sensors including accelerometers, gyroscopes and a barometer (pressure sensor). An antenna ON, antenna sense (open/short circuit) feature, allows the host application to inform the user of problems with the connection to the external antenna.


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