A Method of Frequency Hopping Synchronization

Abstract

The invention discloses a frequency hopping synchronization method. Each frequency hopping receiver captures the synchronization head of the broadcast time slot of the frequency hopping transmitter through the method of slow scanning of the service frequency, thereby obtaining the initial TOD time of the network system, and realizing each frequency hopping receiver Coarse synchronization of TOD time; frequency hopping receivers and frequency hopping transmitters transmit RTT round-trip timing messages in pre-allocated time slots, thereby calculating the time correction amount to adjust the initial TOD time, and realizing fine synchronization of TOD time of each frequency hopping receiver; Each frequency hopping transmitter and each frequency hopping receiver generate a service time slot frequency hopping pattern according to the finely synchronized TOD time, so as to realize the frequency hopping synchronization between each frequency hopping receiver and the frequency hopping transmitter. The invention does not require special equipment to maintain the initial time of each frequency hopping receiver, the hardware platform has strong versatility, and does not need a special timing module, which reduces system complexity and product cost.

Description

technical field [0001] The invention relates to a frequency hopping synchronization method in a frequency hopping network, in particular to a frequency hopping synchronization method suitable for multi-user frequency hopping networks. Background technique [0002] Frequency hopping synchronization means that the frequency hopping receiver and the frequency hopping transmitter use the same frequency at the same time. The content of frequency hopping synchronization includes: the same frequency hopping frequency table, the same frequency hopping sequence, and the same starting and ending moments of hopping. In a frequency hopping network, even if each node in the network has the same frequency hopping sequence, there is still a time difference between each node before synchronization is achieved. In order to achieve synchronous frequency hopping, the real time TOD (Time of Day) is introduced. In a multi-node non-central ad hoc network system, the use of carrier high-speed fre...

AI Technical Summary

Problems solved by technology

This frequency hopping synchronization algorithm requires that the initial error of the TOD value of the sending end and the receiving end is less than the allowable deviation value, which is impossible for a multi-node self-organizing network system with completely uncertain network access times such as random network access and listening network access.

[0004] Patent 2 (Frequency Hopping Synchronization Method Based on Beidou Timing Chip, CN102983881B, 2015) uses the Beidou Timing System to calibrate the time of the frequency hopping transmitter and frequency hopping receiver, that is, to maintain the frequency hopping synchronization of multiple frequency hopping transmitters and receivers The receivers need to be equipped with a Beidou timing subsystem, which increases the complexity of the system and increases the cost

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