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AH: Authentication Header |
DUT1: UT1 – UTC |
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AOS: acquisition of signal |
DVMRP: Distance Vector Multicast Routing Protocol |
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ARIMA: autoregressive integrated moving average |
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ECI: Earth-centered inertial frame |
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ATSC: Advanced Television Systems Committee |
ESA: European Space Agency |
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ESP: Encapsulated Security Payload |
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BC: boundary clock (PTP) |
ET: ephemeris time |
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BCE: before Common Era (BC) |
FFT: Fast Fourier Transform |
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BCD: binary coded decimal |
FH: frequency hopping |
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BIPM: Bureau International des Poids (Paris) |
FIFO: first in first-out |
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FLL: frequency-lock loop |
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BPSK: binary phase shift keying |
FPGA: field-programmable gate array |
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CA: certificate authority |
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CCSDS: Consultative Committee on Space Data Systems |
FTA: fault-tolerant average |
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FWT: Fast Walsh Transform |
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CDF: cumulative distribution function |
GM: gravity-mass constant/PTP grandmaster |
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CDMA: code division multiple access |
GOES: Geostationary Operational Environmental Satellite |
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CE: Common Era (AD) |
GPS: Global Positioning System (Navstar) |
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CHU: CRC time/frequency radio station (Canada) |
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GQ: Guillou-Quisquater identity scheme |
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CIC: concatenated integrate-comb filter |
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HBG: METAS time/frequency radio station (Switzerland) |
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CPU: central processing unit |
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CRC: Canadian Research Council |
HQ: Have Quick (US military radio) |
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DCF77: PTB time/frequency radio station (Germany) |
IANA: Internet Assigned Numbers Authority |
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DH: Diffiie-Helman |
ICMP: InterContinental Mounted Police |
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DNS: Domain Name System |
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DSA: Digital Signature Algorithm |
ICMP: Internet Group Management Protocol |
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DSL: digital subscriber loop |
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DSN: Deep Space Network |
IERS: International Earth Rotation Service |
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DSP: digital signal processor |
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DST: daylight saving time |
IETF: Internet Engineering Task Force |
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DTE: direct to earth |
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DTSS: Digital Time Synchronization Service |
IF: intermediate frequency |
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IFF: Schnorr identity scheme |
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DTTL: digital transition tracking loop |
IPSEC: Internet Protocol Security Engineering |
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IPv4: Internet Protocol Version 4 |
NATO: North Atlantic Treaty Organization |
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IPv6: Internet Protocol Version 6 |
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ISDN: International Standard for Data Networks |
NCO: numeric-controlled oscillator |
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NIC: network interface card |
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ITU: International Telecommunications Union |
NIST: National Institute of Science and Technology (US) |
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J2000: Solar System inertial epoch |
NPL: National Physical Laboratory (UK) |
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JDN: Julian day number |
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JJY: Japan time/frequency radio station |
NTP: Network Time Protocol |
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NTPv3: NTP Version 3 |
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JPL: Jet Propulsion Laboratory |
NTPv4: NTP Version 4 |
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LCI: Moon-centered inertial frame |
NTSC: National Television Systems Committee |
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LFSR: linear feedback shift register |
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LI: leap indicator |
OC: ordinary clock (PTP) |
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LNA: low-noise amplifier |
ODY: Mars Odyssey |
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LORAN-C: Long Range Navigation System |
OSI: open system interconnection |
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PA: power amplifier |
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LOS: loss of signal |
PC: private certificate/personal computer |
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LRU: least recently used |
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LT: Lunar Dynamic Time |
PCC: Processor Cycle Counter (Alpha) |
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MAC: message authentication code/ media access layer |
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PDU: protocol data unit |
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MCI: Mars-centered inertial frame |
PHY: physical layer/Phoenix (Mars lander) |
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MD5: Message Digest Algorithm |
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MER: Mars Exploration Rovers |
PIMP: Protocol Independent Multicast Protocol |
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METAS: National Metrology Institute (Switzerland) |
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PITS: Proximity Interleaved Time Service |
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MEX: Mars Express |
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MII: media-independent interface |
PKI: Public Key Infrastructure |
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MIT: Massachusetts Institute of Technology |
PLL: phase-lock loop |
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POSIX: Portable Operating System Interface |
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MLT: multi-level transport |
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MRO: Mars Reconnaissance Orbiter |
PPM: parts per million |
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PPS: pulse per second |
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MRU: most recently used |
PR: pseudo random |
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MSF: NPL time/frequency radio station (UK) |
PTB: National Metrology Institute (Germany) |
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MSL: Mars Science Laboratory |
PTP: Precision Time Protocol (IEEE 1588) |
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MT: Mars Dynamic Time |
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MV: Mu-Varadharajan identity scheme |
PTTI: precise time and time interval |
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NAIF: Navigation and Astronomy Information Facility |
QPSK: quadrature phase shift keying |
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NASA: National Aeronautics and Space Administration |
RF: radio frequency |
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RFC: request for comments (IETF) |
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RFI: radio frequency interference |
TCP: Transmission Control Protocol |
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RMS: root mean square |
TCS: Selenocentric Coordinate Time (Moon) |
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RPC: remote procedure call |
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RS: Reed-Solomon |
TDB: Barycentric Dynamic Time (Solar System) |
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RSA: Rivest-Schamir-Addelman |
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RTC: real-time clock |
TDRS: Tracking and Data Relay Satellite |
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SC: spacecraft computer |
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SCLK: spacecraft clock |
TH: trusted host |
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SDR: software defined radio |
TOC: time of coincidence/ time of century |
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SHA: Secure Hash Algorithm |
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SI: Standard Second |
TSC: Time Stamp Counter (Intel) |
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SINCGARS: Single Channel Ground and Airborne Radio System |
TT: Terrestrial Dynamic Time |
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TWSTFT: Two-Way Satellite Time and Frequency Transfer |
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SNR: signal to noise ratio |
UDP: User Datagram Protocol |
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SNTP: Simple Network Time Protocol |
USNO: United States Naval Observatory |
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SOF: start of field |
USO: ultra stable oscillator |
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SSB: Solar System barycenter |
UT: Universal Time |
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SSO: sufficiently stable oscillator |
UT1: mean solar time |
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STANAG: NATO Standard |
UTC: Universal Coordinated Time |
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STS: Space Transportation System (Shuttle) |
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UUID: universal unique clock identifier (PTP) |
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TA: trusted authority |
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TAI: International Atomic Time |
VFO: variable frequency oscillator |
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TC: trusted certificate/transparent clock (PTP) |
VLBI: Very Long Baseline Interferometry |
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TCA: Mars Aerocentric Coordinate Time (Mars) |
VSAT: very small antenna terminal |
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TCB: Barycentric Coordinate Time (Solar System) |
WWV/B: NIST time/frequency radio station (Colorado) |
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TCG: Geocentric Coordinate Time (Earth) |
WWVH: NIST time/frequency radio station (Hawaii) |
