Abstract: A contact and ranging system includes a first device that includes a first transceiver, a second transceiver, and a controller to control the first transceiver and the second transceiver of the first device. The first device is operable to determine a distance between the first device and a second device. The first transceiver is configured to perform a discovery operation. Other devices are discovered and added to a list of paired devices. A ranging schedule for each paired device in the list of paired devices is determined. The second transceiver is configured to perform a ranging operation. The ranging and response transmissions are transmitted and received by a pair of devices, such that a range between the pair of devices is determined based upon a time of flight between the pair of devices. The range between the pair of devices is matched with a timestamp and stored in a database.

Abstract: A contact and ranging system includes a first device that includes a first transceiver, a second transceiver, and a controller to control the first transceiver and the second transceiver of the first device. The first device is operable to determine a distance between the first device and a second device. The first transceiver is configured to perform a discovery operation. Other devices are discovered and added to a list of paired devices. A ranging schedule for each paired device in the list of paired devices is determined. The second transceiver is configured to perform a ranging operation. The ranging and response transmissions are transmitted and received by a pair of devices, such that a range between the pair of devices is determined based upon a time of flight between the pair of devices. The range between the pair of devices is matched with a timestamp and stored in a database.

Abstract: A frequency agile wireless response system and method of retrieving user response data from a plurality of users includes providing a base unit and a plurality of handheld response units, each communicating with the base unit over a wireless communication link using a frequency agile communication protocol. Base signals are sent with the base unit to the response units over the wireless communication link. Response signals are sent from the response units to the base unit over the wireless communication link. The base signals include a master transmission and at least occasionally include an extension transmission. The master transmission includes information establishing a time mark for the response units. The master transmission also includes information enabling the response units to receive any extension transmission associated with that base signal.

Abstract: A frequency agile wireless response system and method of retrieving user response data from a plurality of users includes providing a base unit and a plurality of handheld response units, each communicating with the base unit over a wireless communication link using a frequency agile communication protocol. Base signals are sent with the base unit to the response units over the wireless communication link. Response signals are sent from the response units to the base unit over the wireless communication link. The base signals include a master transmission and at least occasionally include an extension transmission. The master transmission includes information establishing a time mark for the response units. The master transmission also includes information enabling the response units to receive any extension transmission associated with that base signal.