Johns Hopkins University Applied Physics Lab (2008)

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Internship Experience at NASAGSFC and JHUAPL
Bill Van Besien
D.C. Space Grant Consortium Sponsorship Recipient
National Science Foundation Cyber Corps Scholar
Johns Hopkins University Applied Physics Lab
George Washington University (BS ’09, MS ’10)
September 8th, 2008
 Educational
 Computer Science, B.S. from GWU 2009
 Computer Science (Focus in Computer Security and Information
Assurance), M.S. from GWU 2010
 National Science Foundation Cyber Corps Scholar
 Contributed Projects under D.C. Space Grant
 NASA Goddard Space Flight Center (2007)
 Expandable Reconfigurable Instrument Nodes (ERIN)
 Johns Hopkins University Applied Physics Lab (2008)
 Analysis of CCSDS File Delivery Protocol on MESSENGER
 Continued work in public Space sector
 Senior Design: Secure and Authenticated Deep Space Communication
 Delay Tolerant Networking Protocol Suite
 Future plans in the Space Industry
June 2008
NASA Goddard Space Flight Center Internship
 Student Internship Program (SIP), Summer 2007
 Code 564 – Microelectronics and Signals Processing Branch
 Mentor: Kenda Newton
 Expandable Reconfigurable Instrument Node (ERIN)
 Distributed Sensor Network with terrestrial
and space applications
 Generic sensor platform with on-board
data processing capabilities
 Contributions
 Developed serial-to-parallel hardware
interface in VHDL
 Developed custom connector bypassing
manufacturer’s I/O board saving mass,
money and power consumption
 Produced documentation for integrating
GPS receiver into hardware
 Debugged flight software for a UAV at
Wallops Island facility (radiometer
June 2008
JHU Applied Physics Lab Internship
 APL Student Internship Program, Summer 2008
 Space Department, Embedded Applications Group
 Mentor: Chris Krupiarz
 Activities at the Lab
 Developed application to determine state of CFDP from spacecraft
telemetry log
 Results will be used in upcoming publication analyzing
performance of CFDP on MESSENGER
 Radiation Belt Storm Probes (RBSP)
 Gained experience developing flight software with CFE and CFDP
from Goddard
 Student Trojan Asteroid Mission Proposal (STAMP)
 Interns designed mission to Trojan asteroids near Jupiter
 Each intern given specialty (e.g., avionics, FSW, propulsion, R/F,
systems engineering, etc…)
June 2008
CFDP Performance on MESSENGER
 What is CFDP?
 Standardization of communication protocols and ground systems
 Requirement to downlink science and telemetry data as fast as possible
 Observed that bitrate can be increased as antenna angle from horizon increases
 Must determine:
 Frequency and distribution of bit errors
 Optimal configuration of CFDP to maximize effective downlink speed
 CFDP Header Parser makes this investigation much simpler
Raw Ground Software Telemetry Dump
PDU Header Parser Architecture
June 2008
Senior Design: CFDP Security Layer
 Provides data authentication and confidentiality (encryption) to systems working within a
CFDP framework
 Threats to Deep Space Missions, current and future…
 Extremely limited telecommand authentication
 Individuals or organizations may sabotage (or otherwise affect) space craft
 Earth departure/flybys do not require large (DSN-caliber) dish or narrow beam-width
 Independent or foreign government teams may be able to uplink to spacecraft
 Standard ground software for International Missions
 Chinese, Russian, US, and more operating through same ground system
 All communication unencrypted and subject to eavesdropping
 Legal repercussions for proprietary or export-controlled instruments
 Dual use technologies
 Enforce separation between protocol layers
 Security layer will encrypt all data to and from the
 Authentication layer will ensure that telecommands
to the spacecraft are from the MOC
 Selectable levels of security
June 2008
Delay Tolerant Networking (DTN)
 Suite of protocols amounting to an “Interplanetary Internet”
 Interplanetary communication involves
Extremely high latency
High bit-error rates
Asymmetric communication
Intermittent communication windows
 Common protocols in use in the Internet (TCP/IP) do not perform on
networks with these constraints
 CFDP has some functionality, but…
 Does not have clear separate levels of abstraction like TCP/IP
 Largely limited to point-to-point (i.e., not intended to rout through a complex
 Intended to be phased out within several years
 Case study of Mars system
 Agents and routers are: rovers on the surface, stationary Landers, and
orbital relay stations
 DTN is a joint effort between JHUAPL and NASA JPL
June 2008
Experience with Internship Program
 Intern Mentoring
 Highly Supportive mentors who I have kept in contact with after internship
 Real contributions to projects
 Developed hardware, software, and utilities for spaceflight missions
 Opportunity to explore other areas
 CS major, but worked in EE
 Challenging Projects
 Able to directly apply concepts learned from coursework
 Professional networking
 Friends in theoretical physics, mission design, management, and EE
Special thanks to the D.C. Space Grant Consortium for sponsoring my internships
at GSFC and APL!
Thank you!!
Any questions?
June 2008

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