Patent ID: 7411550

Claim:
A system for transmitting a positioning signal to a receiving apparatus configured to receive the positioning signal for positioning the receiving apparatus, the system comprising: one transmitting apparatus configured to transmit the positioning signal; a plurality of relay apparatuses configured to relay the positioning signal; and a supplying portion configured to supply data specifying a positional relation between the transmitting apparatus and each of the plurality of relay apparatuses to the receiving apparatus; wherein said transmitting apparatus includes: a time keeping portion keeping time, a storing portion storing data as an object to be encoded, a generating portion configured to generate the positioning signal containing the time, by encoding data stored in the storing portion, using a code for identifying a transmission apparatus of the positioning signal, and a transmitting portion configured to transmit the positioning signal generated by the generating portion; wherein each of the plurality of relay apparatuses includes a receiving portion configured to receive the positioning signal transmitted from the transmitting apparatus, and a transmitting portion configured to transmit the positioning signal received by the receiving portion; and wherein the system comprises no more than one clock.