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.
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.
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.
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 Geoconnect in Australia.
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