Research on Receiving and Processing Technology of Short-Time Burst Spread Spectrum Signal

Short time burst spread spectrum signal has attracted extensive attention in the field of LEO satellite navigation because of its strong anti-interference and good concealment. However, due to the short duration of the short-time burst spread spectrum signal, the acquisition and tracking of the signal is more demanding. The closed-loop tracking algorithm widely used in the navigation field is no longer suitable, and the open-loop carrier synchronization algorithm is needed, which means that the received signal needs to be cached, frequency offset estimation and compensation, which brings great difficultly to the signal receiving and processing. In addition, the traditional L&R carrier frequency offset estimation algorithm is difficulty to balance the estimation range and accuracy. Aiming at the above problems, an improved L&R algorithm is proposed in this paper, which considers the estimation accuracy and greatly expands the estimation range. At the same time, a complete signal receiving and processing framework is designed, and the influence of different parameters on signal receiving preference is fully analyzed in the process of signal receiving, which provides guidance for receiver design and reference for short-time burst spread spectrum signal system design. Through theoretical analysis and simulation verification, the results show that the proposed method can effectively expand the estimation range of frequency offset without affecting the accuracy of frequency offset estimation.