SPIRIT MIL-STD-188-110A data modem software for low cost applications
complies with MIL-STD-188-110A (serial tone, para 5.3) standard and supports
data rates from 75 to 2400 bps (coded rates) and 4800 bps (uncoded) with 3
possible interleavers - from zero to 4.8 seconds.
The modem is intended for communication over HF channels under severe
conditions in the multi-ray and fading environment. It can be used both in
tactical and civil applications.
The modem incorporates powerful equalization, tracking and forward-errorcode
correction schemes to work in severely degraded HF environment with
fast fading (up to 10 Hz), big multi-path spread and high number of rays.
Extended channel quality information makes proper selection of the data rates
easier. The modem allows using power effective nonlinear schemes in the
radios.
Low own processing delay for zero and short interleaver settings allows to use
standard or proprietary vocoders for voice communication over HF.
