Design and Implementation of Demodulator for HighData-Rate Meteorological Satellites

With the continuous development of meteorological satellite technology, more and more observation needs are considered in practical applications, and the amount of transmitted data is also increasing. This paper proposes a design suitable for high-speed demodulation process of $2.4 \mathrm{~Gb} / \mathrm{s}$ data rate and 2.4 GHz IF input with 8 PSK modulation, which fits the modulation scheme of experimental weather satellite. Considering that high-speed meteorological satellites may require the receiver to have high anti-interference and polarization processing capabilities, this digital demodulation scheme adopts several core technologies such as carrier recovery, timing recovery, cross-polarization interference cancellation (XPIC), low-density parity-check code (LDPC) decoding, etc., and some of the implementation methods are analyzed in this paper. The VHDL language is used to implement the all-digital demodulation design, and the error performance in the noisy situation is about 1.0 dB away from the theoretical value. This design scheme can provide reference and support for future high-data-rate meteorological satellite demodulation technology.