FST4SIM(1)

NAME
fst4sim, qra64sim - Generate simulated QRA64, FST4, and FST4W mode signals.

SYNOPSIS

qra64sim msg A-E Nsigs fDop DT Nfiles SNR

fst4sim msg TRsec f0 DT h fDop del Nfiles SNR W

DESCRIPTION

fst4sim can be used to generate FST4 and FST4W signals with user-specified message content, mode parameters, and SNR values.

ARGS

msg
    A valid QRA64, FST4, or FST4W message enclosed in quotation marks.

A-E
    QRA64 sub-mode designator.

Nsigs
    Number of signals to simulate, distributed even across a 2000 Hz bandwidth.

TRsec
    A valid T/R period duration (s).

f0
    Integer signal frequency offset (Hz).

DT
    Decimal signal time offset (s).

h
    A valid modulation index.

fDop
    Decimal Doppler frequency spread (Hz).

del
    Decimal Watterson model delay (ms).

nfiles
    Number of files to generate.

snr
    Add Guassian noise to simulate SNR in 2500 Hz bandwidth.

W
    Hint to break ties between ambiguous messages 0 as 77-bit (FST4), 1 as 50-bit (FST4W).

Generated files are 12000 Hz sample rate, 16-bit unsigned format, mono PCM .WAV files suitable for replay using WSJT-X either vie the GUI wsjtx(1) or using the command line slow mode decoder jt9(1). Files are named 000000_nnnnnn.wav (000000_nnnn.wav for QRA64), where nnnnnn or nnnn increments from zero.

AUTHOR

Joe Taylor, K1JT.

COPYING

fcal is Copyright © 2001 - 2019 by Joseph H. Taylor, Jr., K1JT, with contributions from additional authors. WSJT-X is Open Source software, licensed under the GNU General Public License (GPLv3).

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.