MIL-STD-188-164 Interoperability Of Shf Satellite Communications TerminalsThis standard establishes mandatory Radio Frequency/Intermediate Frequency RF/IF and associated interface requirements applicable to Satellite Communications SATCOM Earth Terminals ET operating over military X-band and Ka-band Super High Frequency SHF channels. Military unique requirements for ET that may operate over commercial C-band, Ku-band, and Ka-band are included. Equipment developers may exceed the requirements herein to satisfy specific program requirements, provided that interoperability is maintained. Thus, incorporating additional standard and nonstandard capabilities and interfaces is not precluded. Existing SHF SATCOM terminals need not conform to this MIL-STD unless they undergo a modernization program.

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MIL-STD-188-164B

SATCOM

Wideband Global SATCOM (WGS) X-band

6.5 International standardization agreement implementation. This standard implements STANAG 4484 (Edition 2), Overall Super High Frequency (SHF) Military Satellite Communications (MILSATCOM) Interoperability Standard. When changes to,

revision, or cancellation of this standard are proposed, the

preparing activity must coordinate the action with the U.S.

National Point of Contact for the international standardization agreement, as identified in the ASSIST database at https://assist.daps.dla.mil.

6.6 SHF SATCOM standards profile.  This MIL-STD is one of a series of MIL-STDs for SHF SATCOM.  The SHF SATCOM standards profile is shown on figure 4.

6.7 RSS Theory.

Root-sum-squares (RSS) is a method of determining the more likely overall variation of a sum        of components which each may vary.  If each component   has a mean value , then the mean         of the sum   and total deviation

, where             denotes the deviation of the   component from its mean value.  If the component deviations take the values   with equal probability and they

are mutually uncorrelated, the sum-of-squares    is the

variance and the root-sum-squares RSS =

∑(∆xk  )

is the standard

deviation of the sum       .  Generally, since the various deviations seldom all add, or subtract, the RSS value represents a more likely, and appropriate measure, for the total variation of the sum even if the RSS value cannot be justified on strict probabilistic arguments.

6.8 Antenna gain vs. pointing variations.  Since the

degrees off beam of the uplink beam will degrade the EIRP in the direction of the satellite, it is this change that is of concern for EIRP stability.  The formula for attenuation as a function

of the pointing error is as follows:

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