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Signal arrival detection method suitable for downlink data link communication of unmanned plane

A technology of downlink data and detection method, which is applied in the field of communication engineering, can solve the problems of sensitive carrier frequency offset and difficulty in determining the threshold value, and achieve the effects of accurate demodulation, shortened locking time, and reduced bit error rate

Inactive Publication Date: 2010-05-12
BEIHANG UNIV
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Problems solved by technology

This method is sensitive to carrier frequency offset, requires dynamic judgment, and it is difficult to determine the threshold value.

Method used

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  • Signal arrival detection method suitable for downlink data link communication of unmanned plane
  • Signal arrival detection method suitable for downlink data link communication of unmanned plane
  • Signal arrival detection method suitable for downlink data link communication of unmanned plane

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] A signal arrival detection method suitable for unmanned aerial vehicle downlink data link communication described in the present invention, the process is as follows figure 1 shown, including the following steps:

[0032] Step 1, communication system function initialization;

[0033] At the transmitting end of the communication system, the framing structure of the communication system is as follows: figure 2 As shown, the signal is noise before it arrives, and the signal framing structure is: preamble, frame header, useful information, frame tail, inter-frame interval, and then continue to be frame header, useful information..., repeating in sequence. In the present invention, when the signal is one-way signal transmission, the length of the preamble sequence should be greater than or equal to 512, and the length of the preamble sequence should be g...

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Abstract

The invention discloses a signal arrival detection method suitable for downlink data link communication of an unmanned plane, which comprises the following steps: firstly, initializing functions of a communication system; secondly, performing signal energy continuous monitoring and calculating correlation energy values by an energy detection unit; thirdly, determining the maximum value and the position of correlation energy by a comparison module; and fourthly, confirming the arrival of signals. The signal arrival detection method shortens the time for locking a synchronizing functional module of a demodulation terminal, and determines the optimal initial sampling point on the basis of the arrival of detection signals, and the position of the optimal sampling point is the position of the maximum value of the energy. The signal arrival detection method can ensure accurate demodulation of the signals and reduce the error rate, and has good stability.

Description

technical field [0001] The invention belongs to the technical field of communication engineering, and in particular relates to a signal arrival detection method suitable for unmanned aerial vehicle downlink data link communication. Background technique [0002] Unmanned aerial vehicle, referred to as UAV, is a kind of unmanned aerial vehicle mainly controlled by radio remote control or its own program. It was born in the early 20th century, but its real rise was after the Second World War. After nearly a hundred years of development, UAVs have been widely used in the fields of military affairs, national economy and scientific research. Contemporary UAVs are responsible for tasks such as 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 drone's data link directly determines the safety and flight efficiency of the drone'...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04B7/26
Inventor 熊小军刘添君梁海龙赵叶星
Owner BEIHANG UNIV
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