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Angle measurement method and system of broadband OFDM signal in UAV data link

A technology of unmanned aerial vehicle and data link, applied in the field of broadband OFDM signal angle measurement method and angle measurement system, can solve the problems of inapplicability and inability to directly use OFDM signal angle measurement, etc., achieve strong adaptability, save signal frequency band resources, The effect of improving the accuracy of angle measurement

Active Publication Date: 2021-07-09
BEIJING RES INST OF TELEMETRY +1
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Problems solved by technology

On the one hand, the methods in the above literature cannot be directly used for angle measurement of OFDM signals with peak-to-average ratio;

Method used

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  • Angle measurement method and system of broadband OFDM signal in UAV data link
  • Angle measurement method and system of broadband OFDM signal in UAV data link
  • Angle measurement method and system of broadband OFDM signal in UAV data link

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Embodiment 1

[0130] The performance simulation results of the broadband OFDM single-channel single-pulse angle measurement method of the present invention are analyzed.

[0131] Such as figure 1 Shown is the principle block diagram of the wideband OFDM signal angle measurement method in the UAV data link of the present invention. The feed sources of antennas A, B, C, and D generate sum signals, azimuth and elevation differential signals, and synthesize single signals based on low-frequency square waves. Channel signal, the channel unit uses AD 9361 to obtain the AGC signal. In the digital receiver, after the second-order moment signal is detected by the low-frequency square wave, the azimuth and elevation angle error signals are calculated by normalization, and then the antenna pair flight is realized through the antenna controller. Target self-tracking.

[0132] Such as figure 2 Shown is the average performance figure of the angle measurement estimation of broadband OFDM signal angle m...

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Abstract

The invention relates to a wideband OFDM signal angle measurement method and an angle measurement system in a data link of an unmanned aerial vehicle. The method performs second-order moment detection based on a sum-difference composite signal. First, the second-order moment and the expected value of the second-order moment of the composite signal are obtained, and further obtained The azimuth detection signal and the pitch detection signal are then calculated to obtain an angle measurement estimate based on second-order moment normalization, which significantly improves the angle measurement accuracy of the OFDM data link compared with the traditional method; in addition, the broadband OFDM in the UAV data link of the present invention Signal angle measurement method, designed for broadband OFDM signal angle measurement method, suitable for single radio frequency channel receiver, without other signals such as PCM / FM, CDMA or BPSK / QPSK auxiliary angle tracking, can realize telemetry and remote control data link three-in-one, with Anti-multipath performance simplifies the system architecture and saves signal frequency band resources.

Description

technical field [0001] The invention relates to the technical field of digital wireless communication transmission, in particular to a wideband OFDM signal angle measurement method and an angle measurement system in an unmanned aerial vehicle data link. Background technique [0002] In the UAV data link system, the ground control station needs to accurately point the airborne communication terminal. The angle tracking system mainly includes three methods: manual tracking, program tracking and self-tracking. Self-tracking is the current mainstream angle tracking method. The tracking accuracy, robustness and reaction speed are obviously superior to the above two methods. According to the principle, self-tracking is mainly divided into five ways: step tracking, conical scanning tracking, single pulse tracking, phased array scanning tracking and multi-beam tracking. The monopulse tracking system with fast tracking speed is often used to compare the received signals from two or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/30H04L27/26
CPCH04L27/2601H04B17/30
Inventor 付林罡闫朝星罗翔孙亚男李辉李响
Owner BEIJING RES INST OF TELEMETRY
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