Patent ID: 6430416
Filing Date: 2002-08-06
Classification: G01S

Abstract:
A system for locating an object, comprising:a first receptor for receiving radio signals and responsively issuing representative respective interface signals; a second receptor for receiving radio signals and responsively issuing respective interface signals; a first location marker located at said object, the first location marker including a GPS pseudorange detector for determining a first GPS pseudorange and a transmitter for transmitting a first of said radio signals including information for said first GPS pseudorange; a second location marker located with the first receptor, the second location marker for transmitting a second of said radio signals; and: a base station for receiving a first of said interface signals issued by the first receptor in response to said first radio signal and a second of said interface signals issued by the second receptor in response to said second radio signal; the base station including a radio pseudorange detector for using a time-of-arrival of said first interface signal for determining first radio pseudorange between the first location marker and the first receptor and determining a second radio pseudorange between the second location marker and the second receptor from a time-of-arrival of said second interface signal, and a hybrid pseudorange processor for using said first GPS pseudorange and said first and second radio pseudoranges in a determination of said location of said object.