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

SINAD

signal-plus-noise-plus-distortion to noise-plus-distortion ratio

UTC

universal time, coordinated

3.3

Timing symbols.

Trw

Tsc

redundant word time scanning call phase

wait time

3.4 ALQA mathematical expressions.

Ei effective sensation level of energy in a speech sub-band

(AI)

Fi weighting factor relating human sensitivity to energy in a speech sub-band to measured energy in that sub-band (AI)

Lf length of messages in queue when message transfer finishes

(ADC)

Lm length of message body (ADC)

Ls length of messages in queue when message transfer begins

(ADC)

Noi noise spectral density in the i-th frequency band

R effective message data rate (ADC)

Si signal spectral density in the i-th frequency band

Tb beginning time of message transfer (ADC) Tf time when message transfer finishes (ADC) U station utilization (ADC)

Wi non-linearly scaled sub-band energy (AI)