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satellite terminals, a user communications extension, and military or commercial satellite resources. For
information on MILSATCOM standards go to: https://disain.disa.mil/sisc/. A brief description of the
categories and types of SATCOM links and standards follows.
The basic categories of SATCOM are:
• Narrow Bandwidth (NB): <= 64 kbps
• Wide Bandwidth (WB) : >= 64 kbps
• Unprotected: Not Anti-Jam or Low Probability of Intercept
• Protected: AJ and/or LPI
• Commercial: Non-government owned or operated
• Government/Military Government owned and operated
Military Ultra High Frequency (UHF) (Narrow Bandwidth)
NB, Military service
Transponded 5 and 25 kHz channels
Complete transition to DAMA based services is mandated, and in process
For 5-kHz or 25-kHz single-channel access service supporting the transmission of either voice or
data: MIL-STD-188-181B, Interoperability Standard for Single Access 5-kHz and 25-kHz UHF
Satellite Communications Channels, 20 March 1999.
For 5-kHz Demand Assigned Multiple Access (DAMA) service, supporting the transmission of data
at 75 to 2400 bps and digitized voice at 2400 bps: MIL-STD-188-182A, Interoperability Standard for
5-kHz UHF DAMA Terminal Waveform, 31 March 1997, with Notice of Change 1, 9 September
1998; and Notice of Change 2, 22 January 1999.
For 25-kHz Time Division Multiple Access (TDMA)/DAMA service, supporting the transmission of
voice at 2,400, 4,800, or 16,000 bps and data at rates of 75 to 16,000 bps: MIL-STD-188-183A,
Interoperability Standard for 25-kHz TDMA/DAMA Terminal Waveform, 20 March 1998, with
Notice of Change 1, 9 September 1998.
For data controllers operating over single-access 5-kHz and 25-kHz UHF SATCOM channels: MILSTD-
188-184, Interoperability and Performance Standard for the Data Control Waveform, 20 August
1993, with Notice of Change 1, 9 September 1998. This standard describes a robust link protocol that
can transfer error-free data efficiently and effectively over channels that have high error rates.
For MILSATCOM equipment that control access to DAMA UHF 5-kHz and 25-kHz MILSATCOM
channels: MIL-STD-188-185, DoD Interface Standard, Interoperability of UHF MILSATCOM
DAMA Control System, 29 May 1996, with Notice of Change 1, 1 December 1997; and Notice of
Change 2, 9 September 1998.
Military Wide Bandwidth, Unprotected
The standard waveform is described in MIL-STD-188-165A, with revision B currently in staffing. It
supports data rates from 64 kbps to 155 Mbps. This specification is compliant with the requirements
for use of commercial WB systems.
The Earth Terminal specification is MIL-STD-188-164, which describes ground, air, and surface
terminal parameters.
UAS ROADMAP 2005
APPENDIX E – INTEROPERABILITY STANDARDS
Page E-8
The Defense Satellite Communications System (DSCS) consists of multiple X-Band transponder
satellites that provide world wide coverage between 65 N and 65 S.
The Wideband Gapfiller System (WGS) is the replacement system for DSCS and is expected to field
the first three satellites beginning in 2005 and ending in 2007. Satellites 4 and 5 are tentatively
scheduled for 2010 and 2011. This system will continue the X-Band capability of DSCS and add a
Military Ka-Band capability. Note that Military and Civilian Ka-Bands are different.
Military Narrow and Wide Bandwidth, Protected
The standard waveforms are described in MIL-STD-1582D and MIL-STD-188-136A.
The waveforms are currently restricted to Extremely High Frequency (EHF), however are evolving to
allow application to Military X and Ka-Bands at a future date.
The current EHF system, Milstar, is in its third generation. This system provide Low Data Rate
(LDR) services, from 75 bps to 2.4 kbps. Medium Data Rate (MDR) services operate from 4.8 kbps
to 1.544 Mbps.
The Advanced EHF (AEHF) system will extend the life of Milstar and add High Data Rate (HDR)
services.
Transformational Satellite (T-SAT) will ultimately merge the capabilities of the WGS and the EHF
series of systems. It will use a protected waveform and support both EHF and Military Ka-Band
spectrum.
Commercial Narrow Bandwidth
INMARSAT Satellite Telephone services
GlobalStar Satellite Telephone services
Iridium Satellite Telephone services
Commercial Wide Bandwidth
The standard waveform is described in MIL-STD-188-165A, with revision B currently in staffing. It
supports data rates from 64 kbps to 155 Mbps. This specification is compliant with the requirements
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