GLOSSARY OF TERMS (Cont)

GMTGreenwich mean Time (also called ZULU Time) PDM Pulse Duration Modulation
GRARE Ground Receiving and Analog Ranging Equipment PLL Phaselock Loop
HMS Hours-Minutes-Seconds POK Paged Overlay Keyboard
IF Intermediate Frequency PRD Program Requirements Document
I/O Input/Output PRF Pulse Repetition Frequency
IOB Input/Output Buffer PRN Psuedorandom Noise
IRIG Inter-Range Instumentation Group (may be IRIG-A, B, or C, dpending on format) PSK Phase Shift Key
KIM Keyboard Input Multiplexer RDT Remote Digital Terminal
KTS Kodiak Tracking Station RF Radio Frequency
LHCP Left-Hand Circular Polarization RHCP Right-Hand Circular Polarization
LO Local Oscillator RTSRemote Tracking Unit
LSB Least Significant Bit RTUReceiver Test Unit
MPP Master Patch Panel SBSU Slave Bus Switching unit
MSAP Multiple Satellite Augumentation Program SCA SGLS Command Adapter
MTA Master Timing Assembly SCD Subcarrier Discriminator
mTc Mobile Tactical Computer SCF Satellite Control Facility
NDSNew Data System SCR Silicon Controlled Rectifier
NFFKNumeric Fixed Function Keyboard SGLS Space-Ground Link Subsystem
NRZNonreturn-to-Zero SNR Signal-to-Noise Ratio
ORDOrbital Requirements Document SOC Station Operator's Console (also called System Operator's Console)
PABXPrivate Automatic Branch Exchange SSF Signal Switching Facility
PAM Pulse Amplitude Modulation STC Satellite Test Center
PCMPulse Code Modulation STCW System Time Code Word

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