Broadband OFDM signal angle measurement method and system in unmanned aerial vehicle data chain
A technology of unmanned aerial vehicle and data link, which is applied in the field of broadband OFDM signal angle measurement method and angle measurement system, and can solve problems such as inapplicability and inability to directly use OFDM signal angle measurement
Active Publication Date: 2019-01-11
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;
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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 adopts 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 pitch 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 value performance figure of the angle measurement estimation of broadband OFDM signal ang...
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The present invention relates to a broadband OFDM signal angle measurement method and system in an unmanned aerial vehicle data chain. The method performs secondary moment detection based on sum difference combination signals to obtain a secondary moment and an expected value of the secondary moment of the combination signals so as to obtain orientation detection signals and pitching detection signals and obtain an angle measurement estimation value based on secondary moment normalization through calculation. Compared to a traditional method, the method provided by the invention obviously improve the angle measurement precision of an OFDM data chain; and moreover, the broadband OFDM signal angle measurement method and system in the unmanned aerial vehicle data chain is designed for the broadband OFDM signals, is suitable for a single radio-frequency channel receiver with no need for auxiliary angle tracking of other signals such as PCM / FM, CDMA or BPSK / QPSK, can achieve three-in-one ofthe telemetry and telecontrol data chains, has an anti-multipath performance, simplifies the system architecture and saves the signal frequency band resource.
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 ...
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Login to View More 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