Transcript Automatic Person Location Technologies and Solutions for

Automatic Person Location Technologies
and Solutions for Public Safety Users
Roger Dowling
Deputy Managing Director – Sepura Limited
Board Member – TETRA MoU Association
Automatic Person Location Technologies
and Solutions for Public Safety Users
Andy Gregory
Senior Account Manager
Hans Van Der Velden
Technical Support Engineer
Sepura Limited
Agenda
•Introductions
•Market requirements for APLS for Public Safety users
•The command and control requirements of an APLS
solution
•Review of location technologies
•TETRA services used for location solutions
•Future of APLS enabled products for public safety users
FACTS AND FIGURES - Sepura
Facts
• Headquartered in Cambridge, UK
• Regional offices in Germany, Scandinavia,
Poland, Russia, South Europe and Asia
• 170+ employees of which 110 in development
• 500+ man years of TETRA development expertise
• Design, develop, sell and support TETRA radios
for use in the global market
• Products manufactured by Siemens
• More than 50 distributors world wide
• Customers in more than 60 countries
100,000th SRP2000 delivered in Dec 2004
Market Requirement Drivers – 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
– Still not implemented !
– No defined accuracy specified !
Both systems proposing using either TDOA or GPS location
techniques
Many Blue Light Forces now mandating APLS
Location Technology - Public Safety
Know where someone is: save LIFE.
Better allocation of resources, prompt
reaction to an Emergency: save TIME.
Better Control of the fleet: save MONEY
Improve job satisfaction: save CHURN
Solution Influencing Factors
Price
Accuracy verses coverage
– Requirements differ for non emergency situations
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
Effective management
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 - AVLS
Resource management - APLS
Resource management –filtering applied
Location Solutions & Performance
Low accuracy, low cost solutions
– Time difference of arrival
– Enhanced observed time difference
Medium accuracy, medium cost solutions
– Standard GPS
– Assisted GPS
– Low signal strength GPS
High accuracy, high cost solutions
– Differential GPS
– Combinations of 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
LMU
Radio tower
LMU
TETRA
Gateway
C&C
Server
GIS or
Mapping
Application
GIS or
Mapping
Application
Network Based Solutions
Current Accuracy = 200m - 2km
LMU
LMU
Future Accuracy =100m 500m
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
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
GPS based solutions
Mapping Server
Mapping
Application
Workstation
C&C firewall
C & C LAN
TETRA gateway
Radio tower
TETRA
Network
PBX
Workstation
Dispatch
workstations
SDS
C&C
Servers
Workstation
Base station
Workstation
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
TETRA
Network
GIS or
Mapping
Application
TETRA
Gateway
GPS
Tower box
C&C
Server
GIS or
Mapping
Application
dGPS Station
SDS
Beacon
Receiver
GPS
Odometer
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
– Usage could increase 10 or 100 fold !
– Requires sophisticated filtering at command &control
TETRA services for APLS
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)
 GPS location data is provided in the NMEA formats, GLL, GSA, GGA etc.
– Typical GLL mesage could contain as much as 48 bytes of data!
– In busy periods, with many location reports being sent, this could cause the network to be
overloaded
 Location Information Protocol –TS 100 392-18-1 v1.1.1 Jan 2005
– Specifies the effective use of network by using compact message formats
– Typical message (compared to GLL) is 11 bytes long!
Future of APLS & TETRA Terminals
Technology Influenced Solutions
– Continuing integration of IC’s and components enables space saving in
handsets and is an opportunity to integrate location devices like GPS.
– The European Galileo system should be operational by 2008 and this is
supposed to perform better than the existing US DofD GPS system.
“GPS” Performance - Trend
Galileo
Clear Sky
L1, L2 + L5
Frequency
(+ Galileo?)
High Quality
Receiver
Under Foliage
Future
GPS ?
High Quality
Hand Held
Receiver
Wooden
Building
Urban Canyon
High sensitivity GPS
Single Storey
Brick Building
Multi Storey
Concrete building
Other Sensors – e.g. Gyroscope, Accelerometers
Underground?
2002
2003 2004 2005 2006 2007 2008
2010………………………….. 2015 2020 2030
Benefits of GPS in Public Safety
Enhances user safety
- Lone worker + Emergency Button + GPS
- Accurate Location
Improves resource usage
- Improves response times
- Selection of most appropriate resource
- Reduce wasted resource
Improves reporting accuracy
- Knowing precisely where an incident took place
Improves user job satisfaction
- User feels safer and more confident
Make GPS mandatory in your handset today
Summary
Many different location technologies available
Technology for both location based and TETRA is rapidly
changing
High sensitive GPS receivers currently provides the best fit for
public safety requirements.
Manufacturers ongoing programme to identify solutions and
bring these quickly to market
MANY THANKS
Any Questions ?