Realizing method for synchronizing high-speed frequency hopping of narrowband

Abstract

The invention relates to a method for synchronizing the high-speed frequency hopping of narrowband, comprising the following steps: generating n frequencies, wherein some parts of the frequencies are variable frequencies generated according to time information and the remaining parts of the frequencies are fixed frequencies generated according to a series of fixed data; a sender circularly sends correlative sequence to a receiver with the n frequencies, wherein circularity is n+1; the receiver synchronously slowly researches, and if the frequency hopping is synchronous, quits the slow research; after completely sending the correlative sequence, the sender sends the scaled hopping of n hopping to the receiver; when the receiver receives the scaled hopping of the n hopping, the sender channel codes time information and service information into interleaved frame, and sends the interleaved frame to the receiver; and after receiving the interleaved frame, the receiver de-interleaves and channel decodes the interleaved frame to restore the time information and the service information. The method can realize the synchronization of fast and reliable frequency hopping of the narrowband in the process of high-speed frequency hopping communication, has no requirement of time difference between the receiver and the sender, and breaks away from requirement to the time information in the traditional frequency hopping communication.

Description

technical field [0001] The invention belongs to the field of wireless anti-jamming digital communication, in particular to a frequency-hopping synchronization realization method between a receiver and a transmitter in a narrow-band high-speed frequency-hopping communication system under the condition of electronic countermeasures. Background technique [0002] Frequency hopping communication is a kind of spread spectrum communication. The carrier frequency used to transmit signals between the receiver and the transmitter changes discretely according to a predetermined rule. If you want to intercept the communication content, you must know the carrier frequency hopping rule. Therefore, it has the ability of anti-interference and anti-interception, and can share spectrum resources. Because frequency hopping itself is a kind of spread spectrum communication, frequency hopping technology is usually used in narrowband communication. [0003] For slow frequency hopping or broadba...

AI Technical Summary

Problems solved by technology

Now someone has proposed a frequency hopping synchronization implementation method based on the relatively close time between the receiver and the transmitter: the frequency hopping synchronization frame of the transmitter includes both the preamble sequence and the frequency hopping synchronization information, and the receiver uses slow After searching for frequency hopping interception, the frequency hopping synchronization signal containing synchronization information is detected, and finally the correct frequency hopping synchronization is established according to the synchronization information; this method can also obtain high reliability frequency hopping synchronization, but it can only be applied to receiving 1. Slow frequency hopping or broadband frequency hopping communication system with relatively close transmitter time; because in the narrowband high-speed frequency hopping communication system, the time difference between receiving and sending is completely random, especially in electronic countermeasures and harsh natural conditions It is difficult to ensure that the receiver and the transmitter can obtain relatively accurate time information through dual transmission, so the existing frequency hopping synchronization implementation methods described above cannot solve the frequency hopping synchronization problem in the narrowband high-speed frequency hopping communication system

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