MIL-STD-187-721 Interoperability And Performance Standard For Advanced Adaptive Hf RadioThe purpose of this document is to describe the technical parameters for adaptive high frequency HF radio that are more advanced than those described in MIL-STD-188-141. The advanced technology contained in this standard will guide the planning of military adaptive HF radio network technology into the 21st century. To fully understand and utilize this document, it is necessary to refer to portions of MIL-STD-188-141.

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MIL-STD-187-721D

5.15.2  One-minute location.

When position is to be reported to a precision finer than 15 degrees but greater than or equal to one minute, the One-minute location CMD format shown on figure 31 shall be used.

b

FIGURE 31.  One-Minute location CMD.

The Req, N, and E flags shall be used as described for the Coarse Location CMD.  The Abn flag shall be set to 1 if the transmitter is airborne, or to 0 otherwise.  The Lat and Lon Degrees and Minutes fields shall be set to all 1s if no value is available for that field.  Lat Degrees shall be set to the latitude in degrees, in a range of 0 through 90, rounded to the nearest integer if the Lat

Minutes field is all 1s, truncated to an integer otherwise.  Likewise, the Lon Degrees field shall be set to the longitude in degrees, in a range of 0 through 180, rounded to the nearest integer if the Lon Minutes field is all 1s, truncated to an integer otherwise.  The Lon Minutes and Lat Minutes fields shall be rounded to the nearest integers.

5.15.3  Precise location.

Precise location in two or three dimensions has not yet been standardized.

5.16  System parameters by address. Not yet standardized.

5.16.1  Multiple frequency set operation. Not yet standardized.

5.16.2  Antenna selection. Not yet standardized.

5.16.3  Power selected by net authorization.

6.  NOTES.

(This section contains information of a general or explanatory nature that may be helpful but is not mandatory.)

6.1  Intended use.

6.1.1  General.

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