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A high dynamic UAV measurement and control signal carrier tracking method

A signal carrier and unmanned aerial vehicle technology, applied in the modulation carrier system, radio wave measurement system, satellite radio beacon positioning system, etc., can solve the problems of a large number of modules, complex algorithms, unfavorable engineering implementation, etc., and achieve loop stability High, low computational complexity, easy to achieve the effect of engineering

Active Publication Date: 2019-09-24
NO 30 INST OF CHINA ELECTRONIC TECH GRP CORP
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Problems solved by technology

[0007] The purpose of the present invention is to: aim at the problems existing in the prior art, provide a kind of carrier tracking method of high-dynamic UAV measurement and control signal, solve the problem that the existing tracking loop needs to use a large number of modules, and the algorithm is complicated, which is not conducive to engineering realization

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  • A high dynamic UAV measurement and control signal carrier tracking method
  • A high dynamic UAV measurement and control signal carrier tracking method
  • A high dynamic UAV measurement and control signal carrier tracking method

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Embodiment

[0037] For the most common QPSK modulation method used in the UAV measurement and control system, there are many carrier tracking methods, and the performance is also very different. The present invention mainly carries out optimized design to FLL plus PLL carrier tracking loop from the angle of practical engineering application, such as figure 2 , image 3 As shown, the present invention first optimizes the design of the digital down-conversion part in the loop, avoids the use of a low-pass filter by constructing an analytic function (that is, a complex function), reduces the amount of calculation, saves hardware resources, and converts the digital down-conversion I and Q two-way data construct the analytic signal s(t), and then construct the analytic signal with the local orthogonal carrier output by the NCO, realize complex multiplication with the input signal s(t), and then take the real part data and imaginary part data respectively Perform subsequent loop operations. ...

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Abstract

The invention provides a high-dynamic UAV measurement and control signal carrier tracking method. The high-dynamic UAV measurement and control signal carrier tracking method comprises the steps that: I and Q data formed by digital down-conversion of intermediate frequency signals is constructed into an analytic function I(k)+jQ(k); orthogonal local tracking carriers generated by a variable numerical control oscillator are constructed into a complex form as shown in the specification; complex mixing is carried out; an identification result is obtained by calculation according to the real part and the virtual part of a complex mixing result; a loop filter adjusts control parameters according to the identification result, and sends the control result to the variable numerical control oscillator; the variable numerical control oscillator adjusts frequency control words and phase control words according to the control result; the first step is returned; and thus, closed-loop control is realized. By means of the high-dynamic UAV measurement and control signal carrier tracking method provided by the invention, the dynamic property and tracking precision requirements can be compatible better; and furthermore, the high-dynamic UAV measurement and control signal carrier tracking method has better dynamic adaptive capacity, convergence performance and tracking precision and good application value, and simultaneously, has the advantages of being low in calculation complexity and easy in engineering realization.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a carrier tracking method for a high-dynamic unmanned aerial vehicle measurement and control signal. Background technique [0002] Due to the particularity of the UAV measurement and control system, its composition includes three parts: relay satellite, ground control station, and UAV platform. The communication distance of the system is long, and the movement speed of the UAV platform is fast. It has the characteristics of extremely low signal-to-noise ratio and high Doppler dynamics. According to the special usage scenarios and task requirements background of drones, the remote control and telemetry process of drones has high requirements on the real-time processing of the system. In the UAV measurement and control system, the carrier tracking loop is the most vulnerable link in the receiver. The loss of lock of the receiver caused by high dynamic signals is often caused ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L7/033H04L27/00G01S19/29G01S19/35
Inventor 白园何健辉夏明贇彭勃
Owner NO 30 INST OF CHINA ELECTRONIC TECH GRP CORP
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