Telemetry Systems

Wireless communication between VBOX products often forms an essential part of our customer’s testing requirements. This may take the form of a Bluetooth connection to a tablet PC for live data output; for transmitting DGPS correction messages to a roving VBOX unit to obtain high positional accuracy; or for the exchange of GPS measurements from one VBOX to another in open-road testing during the development of a vehicle’s safety systems.

When choosing the correct telemetry system it is often necessary to speak to your VBOX distributor to determine which units will best suit your application – both in terms of range and bandwidth, and local laws governing radio transmission.  

DGNSS Base Stations

Posted in Telemetry Systems

VBOX Telemetry Radios

Posted in Telemetry Systems

VBOX Bluetooth Module

Posted in Telemetry Systems

VBOX NTRIP Modem

Posted in Telemetry Systems

NTRIP Modem RLACS250The VBOX NTRIP Modem allows a VBOX 3i RTK to receive positional correction data via Network RTK, without having to use a VBOX Base Station.

Correction messages received via the RTK network can be an advantage if testing is conducted tens of kilometres away from the base station, over large changes in elevation or where topographical obstacles could get in the way.

If RTK coverage is available, the VBOX NTRIP Modem allows for vehicle testing that requires high positional accuracy – such as when validating critical safety systems like AEB/ACC - to be conducted where a VBOX Base Station cannot be deployed.

What is Network RTK?

Network RTK utilises one or more Continuous Operating Reference Stations (CORS) to provide RTK data to a GNSS Rover, usually via mobile internet.

The most common method of Network RTK involves a two-way communication link which allows the roving vehicle to send its position to a service provider that is monitoring satellite observations from several reference stations around a country.

What is NTRIP?

Most network RTK systems are internet based and utilise a protocol called NTRIP (Networked Transport of RTCM via Internet Protocol). A constant internet connection is required to receive corrections, which can be done via a cellular modem, such as VBOX NTRIP, or a smart phone.

How does it work?

The VBOX NTRIP Modem enables the roving VBOX unit to send its position to the stations within the network – just as it would to a single VBOX Base Station. The NTRIP service provider will then calculate the appropriate corrections for the VBOX’s location based on the data from nearby reference stations. This correction information is then returned to the VBOX in the same RTCM format as is used for a single fixed base station.

In order to use this type of correction you have to register and subscribe to a cellular data plan with your local NTRIP provider, such as Topnet in the UK and Germany, Swepos in Sweden or Unavco in the USA.

 

RTK network

Please see RACELOGIC Support for information on modem setup and configuration.

Specification

Power Input: 7 V DC to 24 V DC
Power Consumption: 12 V DC: 75 mA; 18 V DC: 50 mA
Antenna Connection: FME M 50 Ω antenna connector
Size (L x W x H): 76 mm x 56 mm x 25 mm
Weight: 100 g (2.5 oz)
Extended Temperature Range: -40 °C to +75 °C
Bands: Quad-Band (850/9000/1800/1900 MHz), Five Bands UMTS (WCDMA/FDD) 800, 850, 900, 1900 and 2100 MHz

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