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 APPENDIX A

Land-Based Satellite Communications On-The-Move (SATCOM OTM)

A.1 Scope.  This appendix applies to land-based SATCOM systems that operate while on-the-move.  It is a mandatory part of the standard.  The information contained herein may replace specific requirements in the body of the standard (see 1.1).

A.2 Uplink Inhibit.  On-the-move terminals shall immediately inhibit transmission upon loss of downlink signal.

A.3 Antenna pointing loss. The entire text of 4.3.12 (Antenna pointing loss) shall be replaced with the following:

n4.3.12 Antenna pointing loss. The downlink loss due to antenna pointing error shall be less than or equal to 0.8 dB 95% of the time relative to the perfectly pointed case.  The 95%

loss shall be translated to the appropriate uplink loss in

accordance with 6.9, and used as the P2 (power variations in the direction of the satellite caused by pointing losses) RSS contribution to the EIRP stability and accuracy specification in section 4.2.4.  The antenna pointing loss requirement is applicable to the operational ground requirements for the

antenna system to include but not be limited to vehicle, terrain, vehicle speed(s), and elevation angles.  This

requirement is applicable to a blockage-free environment and does not include any timeframe when the antenna system supports a non-operating mode by design (for example, non-operating due to safety considerations)."

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