Post on 07-Apr-2018
8/4/2019 Fra Ptc Brief
1/15
Office of Researchand Development
Highlights of PTC R&D Activities 1
Highlights of R&D Activitiesfor PTC Implementation
Highlights of R&D Activitiesfor PTC Implementation
Terry Tse, Program Manager
Signals, Train Control andCommunications Division
March 12, 2009
Terry Tse, Program Manager
Signals, Train Control andCommunications Division
March 12, 2009
8/4/2019 Fra Ptc Brief
2/15
Office of Researchand Development
Highlights of PTC R&D Activities 2
PTC Implementation
Related Projects
PTC Implementation
Related Projects
Adaptive braking algorithm
Employee-in-charge portable terminal
Support for communication spectrum and throughput improvement
Communication protocol testing
Interoperable communication-based signaling project
Data security
Universal on-board platform
High accuracy GPS tracking
Risk assessment methods
8/4/2019 Fra Ptc Brief
3/15
Office of Researchand Development
Highlights of PTC R&D Activities 3
Adaptive Braking AlgorithmAdaptive Braking Algorithm
0.000005 probability
of overshoot0.05 probability
of undershoot500 ft @ < 30 mph
1,000 ft @
30 mph Target
Objectives
GPS Antennae
EOTDevice
Tail End BPP
Speed/Location
Tractive Effort
Head End BPP
Train Control PC
EnforcementAlgorithm PC
DataFull ServiceBrakeApplication
Full Service BrakeApplication
With Close-loop Iterations, zero-in
-Brake Propagation Rate-Accurate Train Weight-Brake Efficiency
8/4/2019 Fra Ptc Brief
4/15
Office of Researchand Development
Highlights of PTC R&D Activities 4
Adaptive Braking AlgorithmAdaptive Braking Algorithm
0
0.001
0.002
0.003
0.004
0.005
0.006
0.007
0.008
0.009
21500 22000 22500 23000 23500 24000
Stopping Position (ft)
Proba
bilityDensity
Stage 1 Stage 2 Stage 3 Stage 4
Base Case
Distribution
Distribution when
propagation time is known
Distribution when
train weight is known
Distribution when
braking efficiency is known
Target
Loaded, 40-car on flat grade
from 40 mph
IDOT Algorithm Mean
Stopping Position
20800feet
8/4/2019 Fra Ptc Brief
5/15
Office of Researchand Development
Highlights of PTC R&D Activities 5
Employee-in-charge
Portable Terminal
Employee-in-charge
Portable Terminal
WWAN
Base Station
Router
Dispatch
System
PTC-Equipped
Locomotive
Train Control System
Office Server
Office Segment
WLAN
Radio
WLAN
WWAN
Gateway
EIC Work Vehicle
or
Portable Suitcase
housing
a WLAN-WWAN Gateway
WWAN
Radio
GPS
EIC PRT
WLANRadio
8/4/2019 Fra Ptc Brief
6/15
Office of Researchand Development
Highlights of PTC R&D Activities 6
Employee-in-charge
Portable Terminal
Employee-in-charge
Portable Terminal
Proposed Subpart I governing mandatory PTC 2015 deployment statesone of the requirements for PTC is to reliably and automatically preventincursions into established work zone limits EIC PRT will fulfill this
requirement.
Pilot project will be initiated to interface with BNSF ETMS II System.
Software is to be portable so that it can be installed on a laptop, a tablet
PC or a PDA. The communication link between the gateway andlocomotives is system specific.
Safety analysis in the form of Subpart H PSP is completed.
Demonstrated with PDA in RSAC PTC Working Group meeting onFebruary 25 and AAR WCC/RESC on March 11 received very well by
the railroads and the labor groups.
8/4/2019 Fra Ptc Brief
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Office of Researchand Development
Highlights of PTC R&D Activities 7
Communication Spectrum
and Throughput
Communication Spectrum
and Throughput
Communication Network is the backbone of PTC systems
8/4/2019 Fra Ptc Brief
8/15
Office of Researchand Development
Highlights of PTC R&D Activities 8
Communication Spectrum
and Throughput
Communication Spectrum
and Throughput
Assist railroads to petition FCC for waivers of build or lose provision forthe 220 MHz spectrum. (UP and NS have acquired 5 channels of 25
KHz each) Conduct RF demand study using a basic territory model of a
metropolitan area and based on the newly defined messages. (to becompleted end of March)
Develop other measures to improve throughputs and channel use:concatenate messages, use directional antennas, limit power etc
Continue the development of HPDR (Higher Performance Digital Radio)
with MeteorComm. 12 Phase 1 MeteorComm HPDR Radios received at TTCI for testing
MeteorComm continues on schedule on Phase 2 development
8/4/2019 Fra Ptc Brief
9/15
Office of Researchand Development
Highlights of PTC R&D Activities 9
Communication Protocol TestingCommunication Protocol Testing
Application Specific/DataDictionary
Mobile
App.
MWGW OMGW Office
App.
MMGW OWGW Mobile
Radio
Base
Radio
RF(TBD) Internal
Native(TBD)
Internal Internal
ITP
EMP
EMPITP
Bridge
Class
D/C
EMPITP
Bridge
Class
D/C
TCP/
UDP
TCP/
UDPInternal
EMP
Router
InternalInternal Internal
EMP
Router
Internal
8/4/2019 Fra Ptc Brief
10/15
Office of Researchand Development
Highlights of PTC R&D Activities 10
Communication Protocol TestingCommunication Protocol Testing
ITP Interoperable Transport Protocol
A proposed upper-layer, routable transport protocol
EMP Edge Message Protocol
A proposed upper-layer message envelope
Class C
A proposed IP-based multicast protocol
Class D A proposed TCP/IP-based point-to-point protocol
Standard architectural components:
MWGW Mobile Wireless Gateway MMGW Mobile Message Gateway
OWGW Office Wireless Gateway
OMGW Office Message Gateway
8/4/2019 Fra Ptc Brief
11/15
Office of Researchand Development
Highlights of PTC R&D Activities 11
Interoperable Communication-based
Signaling (ICBS)
Interoperable Communication-based
Signaling (ICBS)
Demonstration in Syracuse, NYattracted 50 attendees inJanuary 2009
Presented to RSAC and therailroads in February 2009
Experience learned can beapplied to the Interoperable
PTC testing With the railroads, evaluating
the potential of replacing formauthorities with vital virtual
signaling in dark territories
Communicationbased on-boardand wayside signaling equipmentfrom four suppliers interoperable
with each other
8/4/2019 Fra Ptc Brief
12/15
Office of Researchand Development
Highlights of PTC R&D Activities 12
Data SecurityData Security
Proposed Subpart I will require data security to insure authenticationand integrity of communication data.
Confidentiality will be optional.
Minimum expected would be MAC and HMAC schemes but any
algorithm recognized by National Institute of Standards or otherstandards organization will be acceptable.
Pending BAA submission by universities/railroads partnerships toaddress reducing message overheads, increasing throughputs andkey management.
8/4/2019 Fra Ptc Brief
13/15
Office of Researchand Development
Highlights of PTC R&D Activities 13
Universal Onboard PlatformUniversal Onboard Platform
Develop a set of data elements to be used in this environment.
Cooperating with Locomotive OEMs to enhance this data element list.
Final goal is to develop a cost-effective platform to integrate and maintainon-board applications including PTC within the locomotive LANenvironment.
Off-Board
Comms
On-Board
Buss
Cab Signal
Pick-Up
Universal Cab
Data RadioData Radio
LocationLocation
AMTRAK
Cab Signal
Territory
UPRR
Cab Signal
Territory
BNSF
Cab Signal
Territory
Cab Signal
Interface
PTC
Territory
Cab Signal/
PTC Display
Display
Manager
Display
Manager
Brake
Interface
Brake
Interface
Other
Territories
Other
Loco and PTC
Objects
Other
Loco and PTC
ObjectsControlControl
Brake
System
Brake
System
Track
Characteristics
Track
Characteristics
Joint Project with AAR LocomotiveCommittee and the RailwayElectronics Standards Committee
Develop a common on-boardarchitecture, standard datamessaging, and standard protocolfor command/control services
8/4/2019 Fra Ptc Brief
14/15
Office of Researchand Development
Highlights of PTC R&D Activities 14
High Accuracy NDGPSHigh Accuracy NDGPS
Evaluate High Accuracy NDGPS methodology for suitability for trackdiscrimination with probability of success greater than 0.999999 in PTCimplementation
GPS 15 meters average accuracy
DGPS 3 to 5 meters with 95% confidence
HA-DGPS 10 cm to 30 cm resolution
Upgrade Pueblo NDGPS base station site to be functional equivalentof the first operational High Accuracy Nationwide Differential GPS(HA-NDGPS) site in North America
Conduct demonstrations & tests to show potential benefits for traincontrol, track database maintenance, and other railroad applications
Project will proceed when Coast Guard approves the EngineeringChange Request (ECR) for the Pueblo upgrade. The approval of
ECR is expected to be in April, 2009
8/4/2019 Fra Ptc Brief
15/15
Office of Researchand Development
Highlights of PTC R&D Activities 15
Risk Assessment MethodsRisk Assessment Methods
A Practical Risk Assessment Methodology by Union Switch & Signals
Start with Tolerable Risk Level (TRL) based on the Base Case
Iterate the design of the new system until TRL is reached
4 page Research Results and a detailed report are under review and to bepublished soon
A Generalized Train Movement Model by DecisionTek, Inc
Phase 2 close to completion pending addition of a few minor featureswhich arose from discussion with BNSF on the Beardstown Subdivision(ETMS I territory) simulation results
Phase 3 will soon initiate to incorporate failures and hazardevent simulations