Method for realizing data links of unmanned aerial vehicle for multilevel orthogonal coding spectrum spread

Abstract

The invention discloses a method for realizing data links of unmanned aerial vehicle for multilevel orthogonal coding spectrum spread. The method comprises the following: step 1, utilizing a spectrum-spreading code generator to obtain a group of spectrum-spreading codes with good autocorrelation and orthogonality; step 2, performing serial-to-parallel conversion on binary baseband digital information to turn the information into parallel data; step 3, choosing one of m paths of parallel data in N paths of spectrum-spreading sequences generated by the spectrum-spreading code generator and forming N-level spectrum-spreading information; and step 4, performing digital modulation on the obtained N-level spectrum-spreading information, modulating the information into radio frequency and emitting the radio frequency out. The method enables each spectrum-spreading sequence to transmit a plurality of information bits, thereby improving transmission efficiency. Under the same system bandwidth,multilevel spectrum spread has stronger anti-interference ability than the prior direct sequence spectrum spread. Multilevel spectrum spread can realize the spectrum spread with variable rate or variable processing gain under the condition that chip rate is unchanged, thereby helping to improve the anti-interference ability of systems and supporting the transmission of integrated services.

Description

technical field [0001] The invention belongs to the technical field of communication engineering, and in particular relates to a method for realizing a multi-ary system orthogonal coding spread spectrum unmanned aerial vehicle data link. Background technique [0002] Several local wars in recent years have shown that the role and status of electronic technology in wars is becoming more and more important, and it has become one of the important factors affecting the war process. Therefore, all countries are vigorously conducting research on electronic technology. It can be predicted that in the future battlefield, whether it is a local war or a large-scale war, the confrontation between military electronic systems will become more and more intense. As the main means of command, control, and information transmission, the communication system will definitely become the primary target of enemy interference and destruction. Anti-jamming, anti-interception, and anti-detection have...

AI Technical Summary

Problems solved by technology

In the case of very tight spectrum resources, it is often restricted to occupy an excessively wide frequency band

[0006] Spread spectrum communication is carried out in the dense frequency band of radio stations, because the bandwidth of the front-end circuit of the receiver is too large, and the signals of many radio stations enter the receiver at the same time, which will not only increase the error code of the receiver, but also cause the front-end circuit of the receiver to be blocked Increased probability of phenomenon

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