IRIG STANDARD 200-98
TELECOMMUNICATIONS
AND TIMING GROUP
IRIG SERIAL TIME CODE FORMATS
WHITE SANDS MISSILE RANGE
KWAJALEIN MISSILE RANGE
YUMA PROVING GROUND
DUGWAY PROVING GROUND
ABERDEEN TEST CENTER
NATIONAL TRAINING CENTER
ATLANTIC FLEET WEAPONS TRAINING FACILITY
NAVAL AIR WARFARE CENTER WEAPONS DIVISION
NAVAL AIR WARFARE CENTER AIRCRAFT DIVISION
NAVAL UNDERSEA WARFARE CENTER DIVISION, NEWPORT
PACIFIC MISSILE RANGE FACILITY
NAVAL UNDERSEA WARFARE CENTER DIVISION, KEYPORT
30TH SPACE WING
45TH SPACE WING
AIR FORCE FLIGHT TEST CENTER
AIR FORCE DEVELOPMENT TEST CENTER
AIR WARFARE CENTER
ARNOLD ENGINEERING DEVELOPMENT CENTER
GOLDWATER RANGE
UTAH TEST AND TRAINING RANGE
DISTRIBUTION A: APPROVED FOR PUBLIC RELEASE;
DISTRIBUTION IS UNLIMITED
IRIG STANDARD 200-98
IRIG SERIAL TIME CODE FORMATS
MAY 1998
Prepared by
TIMING COMMITTEE
TELECOMMUNICATIONS AND TIMING GROUP
RANGE COMMANDERS COUNCIL
Published by
Secretariat
Range Commanders Council
U.S. Army White Sands Missile Range,
New Mexico 88002-5110
iii
PREFACE
This document was updated in February 1995. It defined the characteristics of the serial
time code formats A, B, D, E, G, and H. The task of revising this standard was assigned to the
Telecommunications and Timing Group of the Range Commanders Council. This 1998 edition
of the document incorporates Manchester modulation for codes so designated. This standard
should be adhered to by all U.S. Government ranges and facilities where serial time codes are
generated for correlation of data with time.
v
TABLE OF CONTENTS
Page
PREFACE ........................................................................................................................... iii
LIST OF FIGURES ........................................................................................................... vi
LIST OF TABLES ............................................................................................................. vi
ABBREVIATIONS AND TERMS ................................................................................... vii
DEFINITIONS.................................................................................................................... viii
GLOSSARY OF SELECTED TIME TERMS ................................................................ x
INTRODUCTION............................................................................................................... 1
1.0 General Description of Standard.................................................................................. 3
2.0 General Description of Formats .................................................................................. 3
2.1 Pulse Rise Time ........................................................................................................... 3
2.2 Jitter ............................................................................................................................. 3
2.3 Bit Rates and Index Count .......................................................................................... 3
2.4 Time Frame, Time Frame Reference, and Time Frame Rates .................................... 4
2.5 Position Identifiers ...................................................................................................... 4
2.6 Time Code Words ....................................................................................................... 5
2.7 BCD Time-of-Year Code Word................................................................................... 5
2.8 Control Functions ........................................................................................................ 6
2.9 Index Markers .............................................................................................................. 6
2.10 Amplitude Modulated Carrier ..................................................................................... 6
3.0 Detail Description of Formats .................................................................................... 9
4.0 General Description of Time Codes............................................................................. 15
4.1 Time Code Format A.................................................................................................... 15
4.2 Time Code Format B.................................................................................................... 15
4.3 Time Code Format D ................................................................................................... 16
4.4 Time Code Format E ................................................................................................... 16
4.5 Time Code Format G.................................................................................................... 16
4.6 Time Code Format H.................................................................................................... 17
5.0 Detailed Description of Time Codes ........................................................................... 17
5.1 Format A, Signal A000................................................................................................ 17
5.2 Format B, Signal B000 ................................................................................................ 19
5.3 Format D, Signal D001................................................................................................ 24
5.4 Format E, Signal E001................................................................................................. 27
5.5 Format G, Signal G001 ............................................................................................... 30
5.6 Format H, Signal H001................................................................................................ 33
vi
Page
APPENDIXES
A Leap Year/Leap Second Convention ..................................................................... A-1
B BCD Count/Binary Count...................................................................................... B-1
C Time Code Generator Hardware Design Considerations ...................................... C-1
LIST OF FIGURES
1. Typical modulated carrier signal............................................................................ 7
2. IRIG-B coding comparisons: level shift, 1kHz am, and Modified Manchester.... 13
3. Modified Manchester Coding ................................................................................ 14
4. Format A: BCD time-of-year in days, hours, minutes, seconds, and
fractions of seconds; straight binary seconds-of-day plus optional
control bits.............................................................................................................. 18
5. Format B: BCD time-of-year in days, hours, minutes, and seconds;
straight binary seconds-of-day plus optional control bits ...................................... 21
6. Format D: BCD time-of-year in days and hours plus optional control
Bits ........................................................................................................................ 25
7. Format E: BCD time-of-year in days, hours, minutes, and seconds
plus optional control bits ....................................................................................... 28
8. Format G: BCD time-of-year in days, hours, minutes, seconds and
fractions of seconds plus optional control bits ...................................................... 31
9. Format H: BCD time-of-year in days, hours and minutes plus
optional control bits................................................................................................ 34
LIST OF TABLES
1. Typical modulated carrier signal............................................................................ 8
2. Format A: Signal A000......................................................................................... 20
3. Format B: Signal B000.......................................................................................... 23
4. Format D: Signal D001......................................................................................... 26
5. Format E: Signal E001.......................................................................................... 29
6. Format G: Signal G001......................................................................................... 32
7. Format H: Signal H001......................................................................................... 35
