Technical data

DOC-01-TELAS-CRG-4 ASTi ACE Studio Components Reference Guide Rev.M
210 Copyright © 2014 Advanced Simulation Technology inc.
After determining that the signal is received, the signal power and noise power are
affected by the AGC. Additionally, when the squelch is off, the maximum AGC
will determine the background noise when no signal is received. The received
audio is routed out of the component locally and/or onto the Intercom Bus Service
where an operator can hear it (typically thru a communications panel component).
The Transceiver can transmit as well as receive. When the radio transmits the
reception is cut off (assuming half-duplex operation).
To support crypto, simulation radios use a library of crypto tones (soundfiles) with
each Transceiver. This library greatly simplifies the encrypted radio simulation by
automatically playing tones (such as a preamble, a postamble, or a mismatch tone)
at the appropriate times during a secure radio transmission or reception. For more
information on crypto sound files see the ASTi Support page specifically www.asti-
usa.com/support/faq/telestra4/11.html.
Radio jamming occurs when a receiving radio operating in say FM, is blocked by a
strong transmission, most often using a non-matching modulation mode (e.g.
PULSE), causing any desired signal to be masked by the unwanted "jammer". This
capability is supported in the Transceiver.
The jammed status of a receiver is determined automatically by the receiver. The
audio associated with a receiver being jammed is implemented through the Trans-
ceiver component utilizing the soundfile library system to organize the jamming
sounds. Each Transceiver may be set-up to point at a particular Jamming Library
(common or otherwise), and Jamming Group. The soundfile indexes populated
within the sound library/group map to possible modes of the receiver object.
The receiving radio automatically chooses which soundfile to play when it is
jammed. The soundfile (index) chosen is determined by the receiver mode. The
table below specifies what sound index is played based on the mode.
If the terrain interface is configured, the radio environment will determine in-tune
transmitter-receiver pairs and will generate data packets containing the transmitter-
receiver world positions. These packets may be processed by the host computing
system combined with a suitable terrain database to determine highly accurate line-
of-sight terrain obscuration checks in addition to the range calculations. Without
the terrain package, ranging is limited by a calculation based upon a WGS-84
model of the Earth’s curvature.
Notes:
1. For frequencies between 1 and 100,000, no background noise or signal
attenuation effects are simulated. These frequencies provide a clear channel of
communication, regardless of transmission power, world position, etc. The
frequencies are typically reserved for network intercom communications (i.e.
INTERCOM mode)
2. A Transceiver will default to a world position of geocentric X, Y, Z = 0, 0, 0 (that
is, the center of the earth). At this position a radio will receive any radios using the
same frequency without any signal loss or occulting. This feature can be used to
model a radio that monitors a particular radio band, without regard to position or
transmit power.
Receiver Mode Soundfile Index Played
FM 2
AM 3
SATCOM 4
CW 8
USB 9
LSB 10
Pulse 11
SSBF 13