Hopping-rate-related and interval-related shift frequency-hopping communication method

Abstract

The present invention discloses a hopping-rate-related and interval-related shift frequency-hopping communication method. An emission, wherein different hooping rates and different frequency-hopping interval durations are adopted to represent different data information, namely, hopping-rate-related and interval-related. A receiving portion, wherein two identical signal channels are adopted, and receiving frequencies of the two signal channels are different from each other in one frequency-hopping position. When the signal channels receive signals, high electrical levels are output; electrical level output by the two signal channels are determined whether synchronous or not by an synchronization determination circuit, and a binary synchronous working mode is realized, solving of problem of initial synchronization alone is needed and completion of synchronization of carrier waves is not needed. With synchronous normal operation, change rules of the information can be obtained from the synchronization, and the data information is obtained by identifying regular changing information; the receiver portion has no local clocks, and an operation status keeps dynamic and binary followings with the emitted frequencies. The hopping-rate-related and interval-related shift frequency-hopping communication method is advantageous in that dodging interferences on purpose is not needed, synchronization time is shorter, and data transmission is more flexible.

Description

technical field [0001] The invention relates to a variable-speed frequency-hopping communication method for anti-jamming in military communications, and more particularly to a speed-hopping-related and interval-related variable-speed frequency-hopping communication method. It has the advantages of simple structure, miniaturization, strong anti-interference ability and flexible information data transmission. Background technique [0002] Frequency hopping anti-jamming communication technology is the main means of anti-jamming in modern military wireless communication, and it has great military significance for ensuring the smooth communication command of our army in the harsh electromagnetic environment. At present, the known frequency hopping technologies mainly include: conventional frequency hopping communication (FHSS), differential frequency hopping communication (DFH), adaptive frequency hopping communication and other technologies. Another very key technology in freque...

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Problems solved by technology

[0006] (4) The frequency hopping synchronization technology mainly includes the independent channel method, which refers to using a special channel to transmit synchronization information to achieve synchronization. This method requires a special channel to transmit synchronization information, which is not concealed and easy to be found and interfered. This is Its shortcoming, the reference clock method, is to assign a common time base to the network through a certain algorithm to achieve synchronization, and the use is transparent, and the accuracy and stability are also required. Self-synchronization method, the existing self-synchronization method refers to sending Synchronization information is implicit in the information sequence, and the receiver extracts the synchronization information to achieve synchronization. According to different extraction methods, it can be divided into waiting self-synchronization method, scanning self-synchronization method, matched filter self-synchronization method, frequency synchronization method, etc. Estimated self-synchronization method, the disadvantage of this synchronization method is that the synchronization information that can be implied in the information sequence sent by the transmitter is very limited, so the synchronization information that can be extracted by the receiver is even less, this method is only suitable for simple The frequency hopping system of the frequency hopping sequence, and the system synchronization takes a long time to establish. The synchronization header method refers to sending a synchronization header to achieve synchronization before establishing communication. Its disadvantage is that it occupies the communication channel resources and signal power. , similar to the independent channel method, in order to maintain long-term synchronization in the communication process, it is necessary to insert a certain synchronization information codeword

Differential frequency hopping synchronization is mainly divided into two processes: acquisition and tracking. The difference is that the synchronization technology of differential frequency hopping is implemented based on software radio, using FFT-based parallel search and early-late gate tracking methods. The structure of the system is complex.

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