A new algorithm for main carrier acquisition in deep space communications

Abstract

Compared with common near space satellite Telemetry, Telecommand, and Communication (TT&C), deep space TT&C presents a more challenging environment such as long distance, very low Signal to Noise Ratio (SNR). How to acquire main carrier exactly becomes a hot focus for deep space communications. Already there emerged some main carrier acquisition algorithms, but they all require high SNR and small modulation index. In this paper, we develop a new acquire algorithm. First we use the spectral energy center algorithm to shorten the original sequence, filter out some noise and make the spectral more symmetric. Then we adopt the spectral symmetry algorithm to make full use of the whole spectrum information, and utilize FFT to reduce computation complexity. Simulation results show that our algorithm can acquire main carrier successfully under large modulation index and get good performance with low Carrier to Noise Ratio (CNR).

Robust algorithm for high‐dynamic and low‐signal‐to‐noise ratio signal reception in deep space communications

“…First, the principle of spectral energy centre is utilised to shorten the original sequence, filtering out part of the noise and making the spectral more symmetrical; next, the spectral symmetry principle is introduced to take full advantage of the whole spectrum information, with fast Fourier transform to reduce computation complexity. The details of this carrier acquisition algorithm have been described in [17].…”

An Improved Phase Deviation Discriminator for Carrier Synchronization of APSK Signal in Satellite-to-Ground Communication Systems

“…Carrier synchronization needs to recover a local carrier that has the same frequency and phase as the received carrier to adjust the local carrier phase. Carrier synchronization technology is of great research significance for ensuring the satellite-to-ground link to achieve high-quality communication [7].…”