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GPS-Microphone

Data Modem Interface FFSK/MSK data communication over existing voice channel 2400 bits-per-second data rate FEC, CRC, Interleaving and data scrambling used Messages include 8 character unit ID. GPS-Microphone. GPS Processing Standard NMEA 2.0 GGA and RMC sentences

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GPS-Microphone

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  1. Data Modem Interface FFSK/MSK data communication over existing voice channel 2400 bits-per-second data rate FEC, CRC, Interleaving and data scrambling used Messages include 8 character unit ID GPS-Microphone GPS Processing • Standard NMEA 2.0 GGA and RMC sentences • Utilizes SIRF3 based receiver • Typical accuracy within 5 meters

  2. GPS-Microphone Poll-Based Position Reporting • GPS-Mic always responds to location query requests from the Basestation

  3. GPS-Microphone Automatic Position Reporting Modes • Push-To-Talk (PTT) switch activated • Position report sent either on every PTT or a time-throttled basis

  4. GPS-Microphone Automatic Position Reporting Modes 2. Fixed-Time Based • Periodic reporting of position • Time interval value : 1 – 255 • Time interval units: seconds, minutes, hours, or days

  5. GPS-Microphone Automatic Position Reporting Modes 3. Fixed-Distance Based • Position reported if location change exceeds set distance threshold • Distance Threshold : 100 meters – 64 Km • Operational modes: absolute (e.g. geo-fence) or relative (between successive location reads) • Uses separate periodic time check which may be set by user

  6. GPS-Microphone Panic Position Reporting Mode • Special “man down” button on unit initiates periodic panic message with position report • Manual activation/deactivation button press period is programmable • Rate of reporting to Basestation is programmable • Basestation can acknowledge and deactivate through over-the-air command

  7. GPS-Microphone On-Board Memory Features • Unit can store up to 1500 position reports in non-volatile memory • Programmable location storage modes: • Conditional and Temporary • Only used to prevent data loss if currently unable to report • Copy or Audit • Locations are both stored on-board and reported over the air • Deferred Over-The-Air • Locations are stored on-board but not reported over the air, unless directed to through Base station command.

  8. GPS-Microphone Unit and Basestation Messaging Features • High-reliability communication protocol using handshakes and retries • Supports Base station broadcast messages to all units • Efficient time-slot management scheme for unit responses to reduce probability of collisions and need for extraneous data messaging • Supports Base station multi-cast messages to up to 15 separate GPS-Mic groups • Units may be assigned to groups at time of Unit ID designation and provisioning • Can reduce data messaging and simplify equipment management

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