초록 ▼

A signal collection system (SCS) is used in a wireless location system that determines the geographical locations of mobile wireless transmitters. The SCS includes a first receiver module, a first digital signal processing (DSP) module, a control and communications module, a timing signal generator

A signal collection system (SCS) is used in a wireless location system that determines the geographical locations of mobile wireless transmitters. The SCS includes a first receiver module, a first digital signal processing (DSP) module, a control and communications module, a timing signal generator including an enhanced GPS receiver, and a bus coupling the DSP module to the communications and control module. The receiver module receives RF signals from the mobile transmitters via a plurality of antennas and digitizes said RF signals, and provides digitized RF data to the first DSP module.

대표청구항 ▼

1. A wireless location system comprising a plurality of signal collection systems (SCSs) each including a narrowband receiver module wherein the narrowband receiver module comprises a narrowband receiver that receives at most a few RF channels at a time, wherein the wireless location system performs

1. A wireless location system comprising a plurality of signal collection systems (SCSs) each including a narrowband receiver module wherein the narrowband receiver module comprises a narrowband receiver that receives at most a few RF channels at a time, wherein the wireless location system performs the following steps:a) determining the cell site, sector, RF channel, timeslot, long code mask, and encryption key currently in use by the first wireless transmitter; b) tuning a first narrowband receiver at a first SCS to the RF channel and timeslot at a designated cell site and sector; c) based on a time segment of RF data from the first narrowband receiver, evaluating the transmission's power, SNR, and modulation characteristics; d) if the transmission's power or SNR is below a predetermined threshold, waiting a predetermined length of time and then returning to the above step (a).