A new space operation way to signal modulation mode containing only carrier plus telecontrol subcarrier is proposed to deal with the transponder carrier acquisition degradation in satellite communication of a low earth orbit(LEO)satellite running on sun synchronous orbit for over 10 years. The space environment effects on the transponder are firstly analy-ed based on the telemetry parameters including temperature
auto gain control(AGC)voltage and carrier lock from the satellite. Then the uplink signal is adjusted to increase the carrier power by demodulating the range subcarrier and lowering the telecontrol subcarrier modulation index. The results in space operation show that the transponder is damaged by the single event burnout(SEB)
and the diode of the frequency multiplier is affected by temperature modulation of the transponder. The higher the transponder temperature
the more difficult the capture of carrier
and when the temperature is higher than 26.2 -
the carrier cannot be
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