Locating a mobile unit

A system for determining a location of a receiver of radio signals, wherein a first MU (mobile receiver unit) receives signals of a navigation satellite, and wherein said location is relative to a second receiver unit of said satellite system having known location parameters, and wherein said first and said second receivers are capable of receiving signals of a locally deployed cellular network, comprising:

• at least three receivable transmitters of countable time related structures,
• in each receiver, at least one digitizing circuit for sampling signals of said satellite system and of said cellular network,
• a local clock installed in each of said receivers for determining a rate for said sampling,
• at least one processor for processing said sampled data installed in each of said receivers,
• at least one receivable BTS (base transceiver station) of said cellular network, producing within their signals a sequence of uniquely identifiable time related structures,
• at least one navigation satellite of a constellation of navigation satellites, wherein a received navigation signal thereof is powerful enough to facilitate detection of code periods of said navigation signal, and
• a connection between said receivers.