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Synchronization device and method for high dynamic UAV data link

A technology of synchronization device and unmanned aerial vehicle, applied in the field of communication, can solve the problems of high power consumption, unconsidered, unfavorable miniaturization, etc., to overcome loop convergence and judgment, improve real-time performance and reliability, and avoid loop The effect of instability

Active Publication Date: 2019-05-21
湖北三江航天红林探控有限公司
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AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it does not consider the impact of the iteration time of the loop on the real-time performance of the communication link in a highly dynamic environment; it does not consider the decision of the stable operation of the loop in a dynamic environment with different signal-to-noise ratios Basis; it does not take into account the compression or stretching of received signal symbols in the time domain in highly dynamic environments
This method can solve the high power consumption of the traditional UAV frequency division multiplexing continuous communication system, which is not conducive to the miniaturization requirements, and the external synchronization method with the GPS second pulse signal as the auxiliary means in the bad channel. question
The disadvantage of this method is that it does not analyze the synchronization parameters and acquisition algorithms of UAV communication; it does not consider the highly dynamic communication between UAVs
The MCS-51 microcontroller it uses cannot meet the needs of high dynamic broadband communication applications

Method used

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  • Synchronization device and method for high dynamic UAV data link
  • Synchronization device and method for high dynamic UAV data link

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Embodiment 1

[0059] Embodiment 1: as figure 1 As shown, the present invention provides a synchronization device for a high dynamic unmanned aerial vehicle data link, including an input buffer module 1, a correlator group module 2, a parallel N-FFT module 3, a threshold judgment module 4, a Doppler estimation module 5, Data interception module 6, interpolation / extraction module 7 and reference phase storage module 8;

[0060] The input buffer module 1 is used to receive and buffer data, and provide the data source to be correlated for the correlator group module; the buffer size is L×Q, where L is the length of the received data frame header, and Q is the upsampling multiple of each symbol.

[0061] The correlator group module 2 is connected with the input buffer module 1, and is used for grouping the data in the input buffer module, and performing a group correlation operation with the local pseudo-random sequence, and outputting a correlation result. The grouping mode of the correlator g...

Embodiment 2

[0068] Embodiment 2: as figure 2 As shown, the present invention also provides a method for synchronizing the high dynamic UAV data link, including:

[0069] Step 1, input cache;

[0070] The input data is stored in the input buffer module, and shifted according to the first-in-first-out order for partial correlation; at the same time, the input data enters the data interception module, and the data is intercepted according to the synchronization time output by the threshold judgment module.

[0071] Step 2, partial correlation;

[0072]Step 2-1, down-sampling the received signal so that its sampling rate is consistent with the local pseudo-random sequence in the correlator group;

[0073] Step 2-2, segmenting the down-sampled signal, and multiplying the signal of each sub-segment with the corresponding local pseudo-random sequence;

[0074] Step 2-3, accumulating the partial correlation results according to the real part and the imaginary part respectively, to obtain the ...

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Abstract

The invention discloses a synchronization device and method of a high dynamic UAV data link. An input cache module receives and caches data. Related device group modules carry out part correlation on the cached data. A parallel N-FFT module carries out FFT on a related result. A threshold judgment module carries out threshold judgment on a parallel output spectrum value. A Doppler estimation module estimates a Doppler frequency offset amount and a signal scale variation amount. A data interception module intercepts input data from a valid data start bit. An interpolation / extraction module carries out interpolation or extraction compensation to complete Doppler time domain compensation, and a reference phase storage module compensates an instantaneous phase deviation caused by the Doppler frequency offset. The device and the method can be used for the communication synchronization between a UAV and a ground station and between UAVs, the change of a Doppler effect to frequency offset and signal scale changes can be estimated and compensated in real time, and the reliability of communication link synchronization establishment can be improved to a maximum degree.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a synchronization device and method for a data link of a high dynamic unmanned aerial vehicle. Background technique [0002] 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 important role in military and civilian fields. With the rapid development of UAVs, the demand for sharing information resources between UAVs and ground stations and UAVs through data links is becoming more and more urgent. The performance of UAV data links directly determines the ability of UAVs to perform tasks. reliability and flight performance. Due to the fast flight speed of UAVs, and the frequency band and bandwidth occupied by data links are getting higher and higher, the Doppler effect of UAV data links is more prominent, which poses greater challenges to the establishment of commu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L7/06
CPCH04L7/06H04L27/0014H04L2027/0026
Inventor 朱峰田玉琴陈浔濛
Owner 湖北三江航天红林探控有限公司
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