Automatic person location technologies and solutions for public safety users
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Automatic Person Location Technologies and Solutions for Public Safety Users. Michael Ng Asia Regional Director SEPURA Limited Singapore. Agenda. Market requirements for APLS for Public Safety users The command and control requirements of an APLS solution

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Automatic person location technologies and solutions for public safety users

Automatic Person Location Technologies and Solutions for Public Safety Users

Michael Ng

Asia Regional Director

SEPURA Limited

Singapore


Agenda

Agenda

  • Market requirements for APLS for Public Safety users

  • The command and control requirements of an APLS solution

  • Review of current location technologies

  • TETRA services used for location solutions


Market requirement apls

Market Requirement – APLS

  • FCC E911 Mandate in the US

    • Call centres

    • Terminal or Network implemented solutions

      • 50 - 100 metre accuracy for at least 67% of cases

      • 150 - 300 metre accuracy for at least 95% of cases

  • EU E112 Mandate in Europe

    • No defined accuracy specified !

  • Many Emergency Services mandating APLS


Market requirement public safety

Market Requirement - Public Safety

  • Specifically for: -

  • Safety of the police officer – ability to locate officer in an emergency situation and react accordingly

  • Resource (person or vehicle) management


Solution influencing factors

Solution Influencing Factors

  • Price

    • Driven by GSM market – realise only part of GPS abilities

  • Accuracy verses coverage

    • Requirements differ for non emergency

    • Varying locations - in city, in building

  • Ergonomics

  • Power consumption

  • Timing of solution to reach the market

  • Standard solution or proprietary ?

  • Can the solution be supported by TETRA ?

    • Network support and bandwidth requirements


Command control requirements

Command & Control Requirements

  • Effective management of data

  • Bandwidth and network requirements differ from AVLS

  • User needs to feel unthreatened by APLS

  • Updated positioning details fixed to various duties

  • Linking of various systems/databases to provide officer with advance warning of possible dangers


Resource management

Resource Management

  • Know where someone is: save LIFE

  • Better allocation of resources, prompt reaction to an Emergency: save TIME

  • Better Control of the fleet: save MONEY


Location solutions performance

Location Solutions & Performance

  • Low accuracy, low cost solutions

    • Triangulation for location determination using RF signals:

    • Time Difference Of Arrival

    • Enhanced Observed Time Difference

  • Medium accuracy, medium cost solutions

    • Standard GPS

      • Garmin & Megallan – commercial GPS devices

    • Assisted GPS

      • Network assisted

      • Sending information on the states of the satellites computation of locations to the radios

    • Low Signal Strength GPS

      • 1,000X more sensitive than std GPS

  • High accuracy, high cost solutions

    • Differential GPS

    • Solutions combinations


Low accuracy low cost terminal solutions

Low accuracy, low cost (terminal) solutions

  • Time Difference Of Arrival (“TDOA”)

    • very costly to implement in the network

    • accuracy of location is +/- 500 metres

  • Enhanced Observed Time Difference (“EOTD”)

    • low cost, no base station support now claimed

    • accuracy of location is 200m - 2km

  • Both technologies

    • Have good indoor/urban canyon penetration, but with very poor accuracy - a general show stopping issue for network based solutions where location accuracy could be critical

    • Are bandwidth hungry therefore not suitable for TETRA


Network based solutions

Network Based Solutions


Medium accuracy medium cost solutions

Medium accuracy, medium cost solutions

  • Standard GPS

    • time to first acquisition (fix) is typically 3 mins

    • >30 metres accuracy, no indoors or urban canyon coverage

  • Assisted GPS

    • time to first acquisition is typically 30 secs

    • >30 metres accuracy, no indoor, urban canyon

  • Low Signal Strength GPS (high sensitivity)

    • time to first acquisition is typically 45 secs

    • <30 metres accuracy, indoors/urban canyons

  • Note: All the above have a location accuracy of <10 metres for 95% of cases in open space


Standard gps medium accuracy

Standard GPS - medium accuracy


High accuracy high cost solutions

High accuracy, high cost solutions

  • Differential GPS

    • Open space accuracy <10 metres off

    • Expensive to implement with land based differential base stations required and regular network broadcasts

    • Network bandwidth hungry

  • Solution Combinations (GPS+Beacons+Odometer)

    • Accuracy anywhere between 0 - 10 metres

    • Very expensive beacon network required to support this


Gps high accuracy

GPS - High accuracy


Data over network size of problem

Data over network - Size of problem!

  • Typically, position report messages could carry some or all of the following:

    • Date, Time, Latitude, Longitude, Altitude, Speed, Heading, Fix type, Confidence Level, Status, Fix Reason, Terminal ID, User Defined Field.

  • Amount of message traffic generated by APLS systems is much larger than for AVLS

    • Requires sophisticated filtering at command &control


Tetra services for apls

TETRA services for APLS

  • No specification for data amount or structure of GPS messages

  • TETRA services allow use of SDS messaging for transmission of GPS data:-

    • EN 300 392-2: TETRA (Voice plus Data (V+D), part 2: Air Interface, v2.3.2

    • SDS4 and SDS-TL delivers variable length messages to 2047 bits(255 bytes)

  • Working papers:-

    • WG101161, Efficient transfer of location information over TETRA networks, UK Home office, Oct 2001

    • WG103020, Study into TETRA SDS

    • WG303040, Transfer of location information

    • Sepura (and others) presenting papers to WG3

      • Standardisation of location report messages and associated commands


Sepura apls update

Sepura APLS Update

  • This year! – SRP2000 sGPS

  • The worlds first fully working TETRA handportable with built-in ultra sensitive GPS.

  • Locates and track people even in built up city centres.

  • Offering tangible benefits by providing user safety and resource management


Conclusions

Conclusions

  • Many different location technologies available

  • Technology for both location based and TETRA is rapidly changing

  • Low Signal Strength GPS currently provides the best fit for public safety requirements.

  • Sepura has an ongoing programme to identify solutions and bring these quickly to market


Many thanks

MANY THANKS

  • Contact details:-

    Michael Ng

    Asia Regional Director

    Sepura Ltd

    +65 9088 6863

    email:[email protected]


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