Reverse locator

Details Reverse locator Reverse locator

2007-02-21

2009-08-11

Swarthout, Brent (Department: 2612)

Communications: electrical

Condition responsive indicating system

With particular coupling link

C340S426170, C340S932200, C340S988000, C455S456100

Reexamination Certificate

active

07573381

ABSTRACT:
A remote locator (RL) continuously transmits multi-frame pings in a slow ping mode. The user activates a transponder/micro-transponder (MT) to receive at least a portion of the multi-frame ping and transmits a reply to the RL. The RL calculates a distance between the RL and the MT using the time-of-flight between the transmission of the ping and the receipt of the corresponding reply. The RL continues to send pings to the MT, where the ping includes distance measurements encoded therein. The user initiates sending a message from the MT to the RL to change to a fast ping mode, where the RL transmits pings at an increased rate. The MT includes a compass to captures readings while receiving and replying to pings. The MT determines a directional location for the RL with the collected measurements and received information and can provide a distance and directional readout to the user.

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