понедельник, 2 августа 2010 г.

PSK: INMARSAT Satellite

INMARSAT Satellite
INMARSAT AERO. OQPSK, Br-10500


Author: SergUA6
Band Width ~10500 Hz
Low Range ~750 Hz, in this example only!
Baud Rate 10500 Hz
n-Ary (PSK/MPSK) OQPSK, constellation looks as square PSK-8
Count of Carriers single mode
Carrier frequency 6079 Hz, in this example only!
ACF 500 ms
RX mode SSB

Sonograms:

pic.1 Generall view

pic.2 Baud rate
Diagrams:

pic.3 Typical characteristics of OQPSK and other half-modes.

pic.4 ACF
pic.5 View of the signal in VMW

Pictures:

pic.6 Phase constellations


INMARSAT AERO - INMARSAT is using wide enought line of different protocols. In this record, it is presumably AERO-H. The signal is very bright. All the parameteres of this signal can be easily determined.