среда, 21 апреля 2010 г.

PSK: SATCOM Satellite, Telemetry, UHF

SATCOM Satellite, Telemetry, UHF
PSK-2, Br-1200, 15 Channels of data + 1 Synchro

Author: SergUA6
Band Width ~2000-2100 Hz
Low Range ~1452 Hz, only for this record!
Baud Rate General 1200 Hz
n-Ary (PSK/MPSK) 2
Carrier frequency ~2523 Hz, only for this record!
RX mode SSB

pic.1 General view

pic.2 Manipulation speed

pic.3 Phase constellation

pic.4 The bit stream structure in VMW

SATCOM Satellite, Telemetry - Telemetry of sattelites of SATCOM series. The signal has standard parametres. Transmission of 16 channels is organised transparently enough . The structure is well visible on pic.4

Data of all channels is transferred continuously-consistently by ring (circle), without cunnings. That is why, it is enough to build up the bit stream in 16bit "column" after demodulation, to find 0th sinchronization channel on characteristic sequence, and it becomes possible to receive a bit stream of any channel with a binding to its(channel) number. Transmission speed in the channel is 75 Hz.

As it is visible from pic.4, in the signal, in channeles 2, 9, 11-15 only bit=1 are transffered, in other channeles the data is transferred.

The bit stream in channels assumes further processing. Crypto security is not eliminated, and most likely it presents.