Data Transmission Method in Channel Modem Demodulation System for Satellite Communication System

摘要

The present invention provides a demodulation of a channel modem for a satellite communication system which periodically generates a carrier lock signal in demodulating input data and estimating an error of the input data while the channel modem is set to the data mode. The present invention relates to a data transmission method in a device, comprising: demodulating input frequency signals into I, Q data, and estimating / compensating errors for the I / Q demodulated data to output a channel modem for a satellite communication system. In the state where the demodulator is set to the data mode, an error detection step of detecting an error component generated through satellites in the I and Q demodulation data, and determining whether the error estimation value detected in the error detection step is below a predetermined level. An error estimation level determining step and a carrier lock signal when the error estimation value is less than a predetermined level in the error estimation level determining step In the carrier lock signal generation step, the data transmission step of transmitting the error estimation I, Q demodulated data to the voice / data processor based on the carrier lock signal generated in the carrier lock signal generation step, in the carrier lock signal generation step And an iterative error estimation step of periodically generating a carrier lock signal for data input based on the generated carrier lock signal.