The invention discloses a
Doppler frequency offset
processing method between a low-
orbit satellite and a ground terminal; the
processing method comprises the steps that an upper computer calculates the time origin; step 2, a
servo sub-
machine feeds back the accurate
time information of the starting time of a successful
satellite to the upper computer; step 3, the upper computer calculates relevantinitialization parameters; step 4, the upper computer transmits relevant initialization parameters to a DSP, and the DSP transmits the quantized parameter information to an FPGA; step 5, the FPGA performs quantitative calculation of
Doppler frequency offset according to the initialization parameter information transmitted by the DSP, and a
transceiver carries out separate calculation according todifferent carrier frequencies; and step 6, according to the calculated
Doppler frequency offset
estimation value, pre-
distortion is carried out on an emission sub-
machine, and post-compensation is carried out on a receiving sub-
machine. According to the method, the stable
carrier synchronization is realized; the difficulty of
satellite decoding is reduced; the hardware implementation difficulty of Doppler
frequency offset calculation is simplified, so that
complex algorithm design in the FPGA is avoided; and the pre-
distortion and compensation conditions of the bottom-layer Doppler frequencyoffset are monitored in real time.