Mobile Connection Technologies

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To transfer correction data from the reference network or a single reference station to a rover, different technologies are available.

Mobile Radio

At the beginning of GNSS technology, mobile radio was solely used for transferring correction data. But ever since GSM networks have started to develop mobile radio technology has begun to disappear. To transmit correction data via mobile radio, a 2-way radio modem is attached to the reference station and the rover. This modem is able to transfer the data across several kilometres.

The assignment of one´s own frequency is obligatory in Germany, and most well regulated countries. Thanks to hybrid methods provided e.g. by the ALLSAT Virtual Base the advantages of mobile radio and reference networked correction data can be combined. The result is an optimum of availability.

Global System for Mobile Communication (GSM)

GSM, the well-known global standard for mobile communication, cannot only be used to call a friend but also to transfer circuit switched data (CSD). The modem dials a number, just like making a phone call and transfers data instead of speech as soon as a connection is established. Reference networked services can usually be reached via a GSM router.

General Packet Radio Service (GPRS)

GPRS is a service for mobile internet connection. It is based on the GSM network. Temporarily unused GSM voice channels are used for a bundled transfer of data. As it is common with internet processes, data transmission is carried out packed-switched, thus without a guaranteed quality of service. Nonetheless, the quality is always as good as possible and the transfer usually faster than CSD transmission.

Since GPRS charging is generally based upon data volume, it is generally cheaper than GSM. A further development of GPRS and CSD transmission is the Enhanced Data Rates for GSM Evolution (EDGE) which makes possible the transmission of a higher data volume. It is regarded as an intermediate step between GSM and UMTS. At the moment EDGE is not provided nationwide.

Universal Mobile Telecommunications System (UMTS)

UMTS succeeds GSM. The UMTS standard differs from GSM fundamentally, especially with regard to the higher frequency band. UMTS makes broadband internet access possible. However, for the transmission of correction data, UMTS does not offer real advantages. At present, its most significant disadvantage is its limited network coverage.

Satellite Phone Connection

The setup of reference networks and mobile transmission of correction data is possible even in the most remote places on earth. Satellite phones can be used as a modem as an alternative to mobile radio. There are different providers of satellite phone services. All of these offer different technical approaches that have advantages and disadvantages according to their specific applications.

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Communication is our Business.

Besides the providing of our reference solutions, our offer also includes the realisation of the mobile data transfer.

We supply our customers with a SIM card and take over the time-consuming finding of a suitable tariff and the search for an appropriate supplier.