Time synchronization method for multi-antenna system

Abstract

The invention discloses a time synchronization method for a multi-antenna system, and aims to provide a time synchronization method capable of effectively improving time synchronization precision. According to the technical scheme, the method comprises: constructing an inquiry node with M antennas and a response node with N antennas in a multi-antenna system, and the inquiry node sending M paths of wireless signals through the M paths of antennas; the response node detecting M * N message arrival time, selecting S arrival time points of the optimal signal message, and returning the S arrival time points carrying the records at specified time in a time slot; the inquiry node inquiring the response message according to the received response message; and selecting response message arrival time matched with the query message arrival time, calculating time deviation between the query node and the response node according to the selected query message arrival time point and the response message arrival time point, and adjusting the time of the local clock and the query node to finish time synchronization between the response node and the query node member.

Description

technical field [0001] The invention relates to a multi-antenna system time synchronization method which is applied in a time synchronization system among communication members in the multi-antenna wireless communication field and improves the time synchronization accuracy. Background technique [0002] The time synchronization system is a system that can receive an external time reference signal and output time synchronization signals and time information according to the required time accuracy. It can align and synchronize other clocks in the network. Generally speaking, time synchronization is to adopt Technical measures Implement high-precision "comparison" of clocks in the network. To realize the time synchronization system, the first step is to establish a time synchronization protocol, including defining the format of the time stamp, the method of transmitting the time stamp and extracting the correction value, etc., and then implementing the technology based on the p...

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Problems solved by technology

[0004] In the time synchronization system between wireless communication members, one channel is often designated as a common channel, and the remaining channels are used as data channels. All nodes exchange control information on the common channel, and obtain available data channels to transmit data through contention. , when the number of channels used is small, dedicated use of a common control channel wastes channel resources

Since the backbone node has multiple directional antennas to transmit and receive at the same time, if a node uses the same channel to transmit and receive data on different directional antennas, it will cause interference between channels and reduce the throughput of each link.

Moreover, multiple links from one node use the same channel. In order to avoid channel interference, high requirements are placed on the antenna, which also increases the difficulty of system synchronization and increases the cost of the system.

When the number of channels used is large, all nodes compete for data channels through a common control channel, making the control channel a bottleneck and channel resources cannot be fully utilized.

[0005] Due to the large size of the aircraft in the aviation communication system, the antennas are distributed in various parts of the aircraft. The channels of different antennas are due to factors such as differences in the internal wiring of the aircraft and differences in the RF circuits of each transceiver front-end. The RTT method shows that if the paths of the RTT query message and the response message use different antennas, the delay time difference between antenna transmission and reception will affect the final time synchronization accuracy

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