A study of inverse GPS based positioning system

This paper describes the carrier-level simulation for hardware experiments of the inverse GPS based positioning system. Moreover, parameters of the positioning system are studied using this simulator. The positioning system consists of a delay time difference estimation subsystem and a position calculation subsystem. This paper shows the block diagram of the delay time difference estimation subsystem and decides on several parameters, for example frequency conversion into the intermediate frequency, aimed at 2.4 GHz wireless LAN signals. After that, the bandwidth of band-pass filters for correlation and convergence time for position estimation for hardware implementation are discussed. An improved scheme of position estimation using more than five antennas is proposed.