Frame synchronized method for unmanned air vehicle downstream data chain

Abstract

The invention discloses a frame synchronized method for an unmanned air vehicle downstream data chain, aiming at a data chain which takes QPSK as a modulating mode; the method comprises the following steps: step I, communication function initialization; step II, phase mapping; step III, frame header synchronized detection; step IV, frame header synchronized capture acknowledgement; step V, frame trail synchronized detection; step VI, frame trail synchronized capture acknowledgement. On the basis of carrying out phase mapping and eliminating phase ambiguity, the synchronized detection of the frame header and the frame trail is carried out, so as to carry out frame synchronized capture; in the method, the frame header and the frame trail adopt PN codes which have good autocorrelation and meet the low probability requirements of missed synchronization and false synchronization in frame synchronization; the method is simple and is easy to realize, the same module can realize two functions, the hardware realization is simple and convenient and the resource consumption is low.

Description

technical field [0001] The invention belongs to the technical field of communication engineering, and particularly relates to a frame synchronization method suitable for a downlink data link of an unmanned aerial vehicle. Background technique [0002] Unmanned aerial vehicle, referred to as Unmanned Aerial Vehicle (UAV), is an unmanned aerial vehicle mainly controlled by radio remote control or its own program. Contemporary UAVs shoulder the tasks of ground monitoring, target tracking, and military strikes. Because of their small size and strong flexibility, they play an extremely important role in the military and civilian fields. The performance of the UAV data link directly determines the safety and flight efficiency of the UAV to perform tasks, and is the brain and eye of the UAV. At present, UAVs are developing in the direction of light weight, miniaturization, intelligence, stealth, attack, combat, high survival rate, low cost and low loss. [0003] UAV mainly includ...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of the existing unmanned aerial vehicle data link communication system, such as missing synchronization in frame synchronization, low probability of false synchronization, short synchronization establishment time, simple and convenient hardware implementation, and low resource occupancy rate, etc., and propose a new The method of frame synchronization, which uses PN code as the frame synchronization code, and uses the original module of the communication system to perform synchronization detection, and no longer occupies new resources

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