Accurate synchronization timing method and an accurate synchronization timing device for a single-carrier spread spectrum system

Abstract

The invention relates to the technical field of communication, in particular to an accurate synchronous timing method and an accurate synchronous timing device for a single-carrier spread spectrum system. The method comprises the following steps: carrying out matched filtering and interpolation on baseband sampling data by using a root-up cosine filter to obtain data after matched filtering; searching the matched and filtered data at half-symbol intervals, extracting by adopting a multi-phase filter, and quickly capturing the matched and filtered data by adopting a sliding correlation capturealgorithm; when the related value in the capturing process exceeds a preset threshold value; taking the vicinity of a current capture position related peak point as a base point; searching more accurate synchronization points; and after synchronous searching is completed, continuously using a three-time spline interpolation algorithm or a three-point maximum peak value for calculating a more accurate optimal sampling point on the basis, the timing precision can be improved to higher precision, the requirement of high-precision distance measuring equipment is met, and complete algorithm supportis provided for high-precision flying object distance measurement.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a precise synchronization timing method and a precise synchronization timing device of a single-carrier spread spectrum system. Background technique [0002] The overall design of the time synchronization system is as follows: figure 1 , the whole system consists of 4 synchronization stations, 1 reference base station (ground station or master station, referred to as A), and 3 target base stations (rovers or slave stations, respectively referred to as B1, B2, B3). The 4 base stations generate second pulse at the same time, and the master station generates a 100MHz clock signal. It is required that the master station and the slave station have a timekeeping accuracy of not less than 4ns when the distance between the master station and the slave station is not less than 10km, for example figure 1 In , the distance between the master station and the slave station is 50km. At...

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Problems solved by technology

(3) Receiver delay error: The delay of the receiving channel is also a normal non-stationary random process with a slow mean value drift

However, the use of such a high-frequency pulse counter has the problems of high cost and difficult implementation

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