Patent ID: 7881728
Filing Date: 2011-02-01
Classification: G01S,H04M

Abstract:
1. A self-powered positioning and modem system for an existing two-way radio which comprises a speaker-microphone set having an Push-to-Talk (PTT) activation circuit controlling an audio signal to be wirelessly sent and received by a radio frequency transmitter between a transmit mode and a receive mode, wherein said self-powered positioning and modem system comprises: a GPS controller for externally and directly connecting to speaker-microphone set in such a manner that said GPS controller is triggered to wirelessly transmit said positioning signal when said activation circuit of said speaker-microphone set is activated, wherein said GPS controller comprises: a position information receptor arranged to receive positioning signal, wherein said GPS controller is triggered for wirelessly transmitting said positioning signal through said radio frequency transmitter; a signal converter linked to said position information receptor to encode said positioning signal into a RF positioning signal, such that said positioning signal is encoded and transmitted as said RF positioning signal in a wireless manner through said radio frequency transmitter; and a baseband signal processor arranged to mix said positioning signal with a RF audio signal of said speaker-microphone set for wirelessly transmitting said positioning signal through said radio frequency transmitter, wherein said self-powered positioning and modem system is adapted to transmit said positioning information by receiving said positioning signal through said GPS controller, and then wirelessly transmitting said positioning signal through said radio frequency transmitter when said activation circuit of said speaker-microphone set is activated, in such a manner that said positioning signal is mixed with said audio signal for wirelessly transmitting said positioning signal through said radio frequency transmitter, and that said positioning signal is encoded into a corresponding RF positioning signal, wherein said GPS controller is periodically self-triggered to wirelessly transmit said positioning signal without said audio signal.