FAST telescope optical transmission system based on Delta-Sigma Modulation

This paper proposes a system based on Delta-Sigma modulation to solve the influence of the deflection reflecting surface and the large-scale traction movable feed system on the astronomical signal received by the feed in FAST. Compared with the traditional solution, this solution focuses more on optimizing from the transmitting end. Through oversampling technology and noise-shaping technology, the quantization noise generated by the transmitting end from analog signal to digital signal is reduced. Experimental results show that the amplitude jitter, phase difference, and frequency spectrum of the system have been significantly optimized.