A New Subcarrier Demodulator of Satellite Telemetry Approaching to the Ideality Based on the Digital Signal

In the deep space communication under the USB (unified S-band) system, the channel coding is generally used in the telemetry down-link. To get the coding gain, the subcarrier demodulation model needs to work reliably under the low Es/No. In this paper, a new BPSK subcarrier demodulation model of digital signal is introduced. This demodulation model is able to work well when the E
_b
/N
₀
is up to 1 dB, also its demodulation loss is very low. So it is applicable for the bad telemetry channel.