Introduction

A large number of terrestrial systems, such as telephone networks, for electricity distribution and television broadcasting, scientific and seismographic networks and systems for financial transactions, require time-frequency synchronism signals for their proper functioning. This type of signals is normally provided by GNSS systems, among which the most used is the GPS. However, in recent years the interest in alternative systems has become more and more vivid.

Technical features

Method and a system for synchronizing several stations located on the territory. These earth stations (called user stations) govern their local clock to a reference clock held by the station acting as the master station. The innovative aspects are represented by the fact that the system does not require a dedicated band but uses spread spectrum techniques and a greater reliability, due to the use of higher frequencies, which do not present interference problems caused From broadcasting stations.

Possible Applications

• Single Frequency Network (SFN) TV broadcasting networks;
• Telephony and electricity distribution infrastructure and networks;
• Seismographic stations;
• Bank security and financial transactions.

Advantages

• Low implementation, installation and operating costs;
• Does not require dedicated bandwidth, using spread spectrum techniques;
• Can be used by a large number of ground services;
• Reset services in the event of a GPS signal interruption;
• Low cost realization of receiving and transmitting devices;
• Less noise (spoofing, jamming, etc…) thanks to higher frequencies and high directivity antennas;
• No ground connection between the trusted stations.