Unmanned aerial vehicle data link frequency offset detection method

A data link and frequency offset detection technology, applied in the field of signal processing, to achieve the effect of improving accuracy and reducing waste of system resources

Active Publication Date: 2017-03-29
FLIGHT AUTOMATIC CONTROL RES INST
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Problems solved by technology

[0009] The purpose of the present invention is to propose a new frequency offset detection method to solve the problem of frequency offset in coherent demodulation under low bit error rate in the existing unmanned aerial vehicle data link communication system. The method uses PN code as the synchronization information sequence, and Use the original modules of the communication system to perform synchronous detection without occupying new resources

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  • Unmanned aerial vehicle data link frequency offset detection method
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  • Unmanned aerial vehicle data link frequency offset detection method

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Embodiment Construction

[0040] The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0041] A frequency offset detection method applicable to unmanned aerial vehicle data link of the present invention, for the data link with QPSK as the modulation mode, the flow structure block diagram of the uplink frequency offset detection is as follows figure 1 shown, including the following steps:

[0042] Step 1: Data link system function initialization;

[0043] At the transmitting end of the data link system, the symbol mapping of this design adopts QPSK mapping. The baseband modulation process of QPSK includes serial-to-parallel conversion and single-to-bipolar conversion. After mapping, the data is divided into two channels, I and Q. The two signals are framed separately. The structure of the signal frame is: synchronous information sequence, followed by repeating the frame start, data area, che...

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Abstract

The invention provides an unmanned aerial vehicle data link frequency offset detection method. The method includes the following steps of: data link system function initialization; decimal frequency multiplication offset value calculation, integer frequency multiplication offset value calculation and frequency offset value validity judgment. According to the frequency offset detection method provided by the invention, PN codes are adopted as a synchronization information sequence, the original modules of a communication system are utilized to perform synchronous detection, and new resources are not occupied.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a frequency offset detection method of an unmanned aerial vehicle data link. Background technique [0002] Unmanned Aerial Vehicle (UAV) is an unmanned aerial vehicle mainly controlled by radio remote control or its own program, which was born in the early 20th century. After nearly a hundred years of development, UAVs have been widely used in the fields of military affairs, national economy and scientific research. Contemporary unmanned aerial vehicles shoulder tasks such as target tracking and ground monitoring. Because of their small size and strong flexibility, they play an extremely important role in the military and civilian fields. [0003] UAV mainly includes aircraft body, flight control system, data link system, launch recovery system, power supply system, etc. In the UAV system, the data link plays a very important role. It can ensure the accura...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00
CPCH04L27/0014H04L2027/0026
Inventor 任继军
Owner FLIGHT AUTOMATIC CONTROL RES INST
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