Abstract: A system determines the entry or exit lane of vehicles passing through a vehicle gate that has a plurality of vehicle lanes through which vehicles enter or exit. A tag interrogator is positioned at a predetermined location of the vehicle gate and emits a signal containing a tag interrogator ID. A plurality of the vehicles lanes are within range to receive that signal. A tag transmitter is mounted on a vehicle that enters or exits the gate and receives the signal emitted from the tag interrogator, which determines the Received Signal Strength Indication (RSSI) and in response, transmits an RE signal containing the tag interrogator ID and the RSSI for determining which vehicle lane the vehicle is located based on the tag interrogator ID and RSSI.

Abstract: A communications system, such as part of a real-time location system, includes a transmitter that can be part of a location processor, tag emission reader or tag interrogator that generates a frequency shift key (FSK) modulated wireless communication signal representative of digital data and transmits the communications signal over a wireless communications channel. A receiver such as incorporated within a tag transceiver used in the real-time location system receives the FSK modulated communication signal. The receiver includes a circuit for calculating the magnitude of low and high tones of the FSK modulated communication signal and a threshold for amplitude shift keyed (ASK) channel data and FSK channel data to derive the digital data even in the presence of on-tone jammers in the communications channel.