November 16, 2007

Presented by:

Scott VanDam, PE

Consultant

Aviation and Missile Research, Development and Engineering Center

Presented to:

4th Annual GIS ConferenceTroy University

Minimal cost Implementation of an Automatic

Vehicle Locating System (AVLS) utilizing legacy radios with custom channel steering modification and COTS GPS modems

Minimal cost Implementation of an Automatic

Vehicle Locating System (AVLS) utilizing legacy radios with custom channel steering modification and COTS GPS modems

Approved for public release; distribution unlimited. Review completed by the AMRDEC Public Affairs Office (November 15, 2007, FN3366)

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L / A

GPS

GPS

GPS

Fire Truck/Police/other tracked Vehicle

R S C S T R R D T D C DT A K D T A

T A L K Channel steeredMotorola AstroW4 radio

Dual fiber

AVLS Repeater

Automatic Vehicle LocationSystem

OVERVIEWGPS Constellation, 10K+ miles altitude

CES WirelessGPS-150modem

CES Gateway, Base W4 Receiver,CES WirelessMDC-150 base modem

EmergencyOperations Center I/CAD with I/Dispatch

Dual fiber

EOC node

Database Node

AsynchronousShort BurstDataMessage

PeriodicBurst 1.5 secDataMessage

CES GPSMobileAntenna

Base Rx Node

Time 3 &Distance 3

Time 2 &Distance 2

Time 1 &Distance 1

Dual fiber

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AdvantagesAdvantages

• Increased return on existing radio infrastructure assets

• Motorola approved GPS (Global Positioning System) accessories

• Lower life time cost than CDPD/GSM/GPRS systems

• Location change only and nonpolled configuration minimizes network loading

• Dedicated AVL repeater independent of normal system voice traffic operations

• Optional panic/duress vehicle input button available

• Passive architecture decreases overload protocol bandwidth requirements

• Vehicle location data available to multiple users in multiple protocols

• Optional preprogrammed higher speed update rate based on vehicle input, i.e. flasher bar activation

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Mobile ConfigurationMobile Configuration

.Motorola Astro

SpectraW4 mobile radio

(modified connector)

CES Wireless

CES modem programmed

For Motion TrackPassive mode

GPS-150

CES Wireless

GPS SM-1575

Receive Radome Antenna

Existing vehicle UHF Mobile

Transmit/ReceiveAntenna

VehicleMicrophone

VehicleSpeaker

RF

RF

GPS

Audio

Audio/PTT switch

GPS

GPS

15 pin CES Wireless radio interconnect cable

radio front mic jack

OptionalVehicleDuressAlarmInput

Normally grounded duress lead

OptionalVehicle

Pos. updateRate input

GPS

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Repeater ConfigurationRepeater Configuration

.

Dedicated Quantar NB UHF Analog AVL multi-mode Station Repeater, single AVL channel pair allocation

Dedicated UHF AVL FixedVertical Antenna

On Existing Tower

RemoteProgramming,Configuration,Diagnostics,

Upgrades

RF

(No changes required to Voice system, an independently operating repeater)

phone line allows remote access to AVL Repeater

From vehicle To base

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Custom AVLS Design TestingCustom AVLS Design Testing

• WPL AVL Test Configuration

.Motorola

XTS-5000 (test), W4 operations

BaseAVL radio

CES WirelessBase Modem

MDC-150

PDUs via

LAN (OptionalNetworkSwitch)

RF

MSK encoded AudioSerial Data

25 pin CES Wireless base radio interconnect cable

CES WirelessGateway Server

Low lossRG-8 coax

RedundantDual fiber pair

(Optional fiberinterface)

Windows Service

CES GPS data

translatorsoftware

Tests Back up, I/CAD networks connections and alternate XML/PDU data type outputs

WPLRoofUHFOmniAntenna

From AVL Repeater

TCP/IP UDP via

LAN

(OptionalWPL DIS

Switch) SIM Row

XIG

2nd

EthernetCard

(Test & Exercise mode)

Commanderetc

To dispatch/database

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I/CAD Dispatch enhanced AVLSI/CAD Dispatch enhanced AVLS

LAN

I/CAD

I/Tracker&

I/Dispatcher

To database

To Emergency OperationsCenter

Dual fiber pair

Dual fiber pair

Optional Switch

I/CAD Operator Network connections

EOC node

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Parts ListParts List

• MOBILE: • (modified Motorola Astro W4 radio)• CES GPS-150 integrated GPS modem• CES ANT-02 fixed mount GPS radome antenna• CES 240/03-00-0 custom Astro Spectra W4 radio interface cable

• BASE:• Dedicated XTL-1500 380-470 MHz trunked base radio with 3600 enhancement (Sharp Quote detail)• Dedicated UHF roof mount antenna and coax• CES MDC-150 base station modem • CES MDC-150 base station modem interface cable• CES fleet-Control computer server/base modem controller• Intergraph I/CAD computer & monitor for display of map and vehicle positions• WPL/Intergraph CES Wireless to I/CAD I/Tracker data/protocol converter windows service software• Intergraph I/CAD software• Intergraph I/Tracker & I/Dispatcher software modules•

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Radio ModificationsRadio Modifications

• The W4 radio required a few minor hardware modifications to enable this GPS vendor solution:

• Enable radio speaker quieting during GPS data transmission• Disable GPS location transmissions when radio is in use on a busy trunked channel• Disable GPS location transmissions when radio is currently keyed i.e. PTT depressed for voice traffic• Enable radio channel steering to allocated repeater AVL channel

• The W4 radio also required the simple programming of an additional AVL channel:

• These modifications require approximately two hours each of Motorola certified service shop time • The radios are no longer under warranty so there is no drawback to performing the mods

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AVL Testing AVL Testing

• Busy – Verified that while radio is currently receiving audio, modem will not interrupt • PTT – Verified that while radio is keyed for voice, modem will not interrupt• Range – Verified over 95% coverage of desired target area with existing W4 at high power level and 600

baud rate• Baud Rate - Verified data transmission at 1200 baud rate, currently testing with 600• Accuracy – Tracking tests independently verified position locations as reported by CES modems in the

field to within 10 meters• Latency – There is an approximate 5 second delay from modem transmission to I/Dispatch map pos.

update• Transmission time – The radio switches to the AVL channel, transmits the update, and returns to the prior

used channel in 1.6 secs (1200 baud rate)• Motion Tracking – Range tests were successful showing that the modems transmit position reports only

when substantial vehicle position change has occurred• Software – All three S/W components tested and work well:

– CES Wireless fleet-Control gateway– Intermediary Intergraph/WPL CES Wireless to I/CAD data format translator/forwarder– Intergraph I/CAD with I/Tracker & I/Dispatcher modules

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CES Wireless Modem/W4 Radio Interface Timing Diagram

MODE

Busy

HOME

Modem PTT

Radio PTT*

MSK Audio

(time)

Modem programmed100 msec

Mode Down Arrow > 0.5 secstores current radio ch.

Settle time before radio checks busy,

Modem programmedFor 250 msec

Assumes radio has clear channels and busy remains unasserted

100 msec Per division

PTT falling edge triggered pulse, width set by 74LS122 kRC time constant

GPS data at 600 baud(1200 baud half this time)

Modem out PTT, circuit input PTT

Circuit out PTT, Radio input PTT

Home key > 50 msecswitches radio to AVL ch.

Settle time for radioafter switching to AVL Channel, set by modem lead in delay,

10K pot and 1.5 uF cap RC time constant

Modem programmed lead in delayset for 750 msec

Repeater settle time

Mode Down Arrow> 50 msec and < 0.5 sec

returns radio to previously stored radio Channel

Modem programmed600 msec

Settle time for circuit generatedPTT to charge set by 10K pull up and

1.5 uF cap RC time constant

NOTE: dotted lines are not physical connections between Modem and Radio