IRIG ORG is an informational website that is available to all who are interested in quick and easy access to TELEMETRY or IRIG information. Time Codes (IRIG A, IRIG B, etc), IRIG106 CH10, or any of the comprehensive telemetry standards that ensure interoperability in aeronautical telemetry applications in use at the member ranges can be referenced from this URL. This website is not a legal entity of the Range Commanders Council (RCC) or it's development of the Inter Range Instrumentation Group (IRIG) standards.
Inter Range Instrumentation Group
Modern day electronic systems such as communication systems, data handling systems, and missile and spacecraft tracking systems require time-of-day and year information for correlation of data with time. Serial formatted time codes are used to efficiently interface the timing system output with the user system. Standardization of time codes is necessary to ensure system compatibility among the various ranges, ground tracking networks, spacecraft and missile projects, data reduction facilities, and international cooperative projects. These digital codes are typically amplitude modulated on an audio sine wave carrier or transmitted as fast rise-time TTL signals.
The use of the IRIG standard is to provide a standard protocol for serial time codes that are generated for correlation of data with time.
IRIG Standard 200-04 (added year information to format). Previous revisions are IRIG Standard 200-98 (added Manchester modulation) and IRIG Standard 200-95. IRIG Document 104-60 was the original standard accepted in 1960.
IRIG-B refers to a serial time code format. This a timing signal that has a rate of 100 pulse per second signal, There are other rate that are designated in accordance with the IRIG Standard 200-04 (see below). IRIG-B sends Day of Year, Hour, Minute and Second data on a 1KHz carrier, with an update rate of one second. IRIG-B DCLS (DC level shift) is IRIG-B without the 1KHz Carrier.
|IRIG-A||1,000 PPS (pulse per second)||1 ms|
|IRIG-B||100 PPS||10 ms|
|IRIG-D||1 PPM (pulse per minute)||1 minute|
|IRIG-E||10 PPS||0.1 second|
|IRIG-G||10,000 PPS||0.1 ms|
|IRIG-H||1 PPS||1 second|
Note IRIG-C was replaced by IRIG-H
The name of an IRIG code format consists of a single letter plus 3 subsequent digits. Each letter or digit reflects an attribute of the corresponding IRIG code. The following table contains standard code formats defined in IRIG standard 200-98:
|IRIG A||IRIG B||IRIG D||IRIG E||IRIG G||IRIG H|
|1,000 PPS ( 1 ms
100 PPS ( 10 ms count )
1 PPM ( 1 minute count )
10 PPS ( 0.1 second count )
10,000 PPS ( 0.1 ms count )
1 PPS ( 1 second count )
|DC Level Shift (DCLS), width coded, no carrier
Sine wave carrier, amplitude modulated
100 Hz / 10 millisecond resolution
1 kHz / 1 millisecond resolution
10 kHz / 100 microsecond resolution
100 kHz / 10 microsecond resolution
|BCD, CF, SBS
BCD, BCD_Year, CF, SBS
BCD, BCD_Year, CF
BCD, BCD_Year, SBS
*IRIG standard 200-04 added year informaion.
Abbreviations used in the table above:
|IRIG106.org||Information about IRIG 106 Ch10 Digital On-Board Recorder Standard.|
|ITC||International Telemetry Conference (ITC/USA) official website.|
|RCC web site||Range Commanders Council (RCC) official website.|
|RCC Publications||Documentation for IRIG standards available from this RCC link.|
|SFTE.org||The Society of Flight Test Engineers (SFTE) Official Site|
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