The invention discloses a Tiantong
satellite-borne terminal
Doppler frequency compensation device and method, and belongs to the field of
satellite communication. The method mainly comprises the following steps that: firstly, a terminal searches an
FCCH (Frequency
Control Channel)
signal at a specified frequency point, estimates a
signal-to-
noise ratio, searches a frequency point with the best
signal-to-
noise ratio, estimates the signal-to-
noise ratios of a resident beam and an adjacent beam
FCCH channel in real time, and outputs frequency information of the resident beam
FCCH channel; reading
ephemeris information and a Tiantong orbital motion information file to obtain
ephemeris information and Tiantong orbital motion information at the current moment; calculating a
Doppler frequency offset value and a
Doppler frequency offset change rate according to resident beam FCCH channel frequency information in combination with
ephemeris information and Tiantong orbital motion information; and finally, compensating an uplink signal and a downlink signal of the terminal according to the Doppler
frequency offset value and the Doppler
frequency offset change rate. According to the invention, the problem of
distortion of signals received by the
satellite-borne terminal caused by large Doppler
frequency offset can be solved, so that reliable communication between the satellite-borne terminal and the Tiantong satellite can be ensured.