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A small unmanned aerial vehicle image transmission signal analysis and demodulation method

A small unmanned aerial vehicle and signal analysis technology, applied in the field of signal processing, to achieve the effect of expanding the estimation range and improving the estimation speed

Active Publication Date: 2021-06-22
UNIT 63892 OF PLA
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Problems solved by technology

The CP-OFDM (Cyclic Prefix-OFDM) signal is the most commonly used and important type of signal in the small UAV image transmission signal. It adopts the form of inserting a cyclic prefix in the guard interval. Research not yet reported

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  • A small unmanned aerial vehicle image transmission signal analysis and demodulation method
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  • A small unmanned aerial vehicle image transmission signal analysis and demodulation method

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Embodiment Construction

[0071] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0072] Such as figure 1 As shown, a small unmanned aerial vehicle image transmission signal analysis and demodulation method, which includes the following specific steps:

[0073] S1. Receive UAV image transmission signal

[0074] Under the condition of non-cooperative reception, receive the UAV image transmission CP-OFDM signal within the preset detection frequency range, figure 2 It is the frequency domain waveform of the image transmission signal of the small UAV, and the center frequency and bandwidth of the frequency domain waveform are roughly estimated by the maximum likelihood estimation method according to the frequency spectrum.

[0075] S2. Delayed autocorrelation estimates the number of subcarriers and the subcarrier symbol rate

[0076] Under the condition of non-cooperative reception, OFDM signal ana...

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Abstract

The invention discloses a method for analyzing and demodulating a small unmanned aerial vehicle image transmission signal, which includes the following sequential steps: receiving a small unmanned aerial vehicle image transmission CP-OFDM signal within a preset detection frequency range under a non-cooperative receiving condition; Estimate the number of subcarriers of CP-OFDM signals based on delayed autocorrelation, calculate the number of subcarriers, that is, the number of FFT points in OFDM modulation and demodulation, and estimate the subcarrier symbol rate to complete the sampling rate alignment; according to CP-OFDM For OFDM signals, the data at the end of the data frame is copied to the guard interval as a cyclic prefix to form a unique cyclic structure, and the signal is subjected to sliding autocorrelation to obtain CP-OFDM signal symbol timing synchronization; a two-step processing mode of rough estimation combined with precise synchronization is used for timing The synchronized symbols complete the frequency offset estimation and compensation; the actual UAV image transmission signal data is used for estimation verification. The invention aims at the image transmission signal of the small unmanned aerial vehicle under non-cooperative conditions, and realizes the perception and identification of the CP-OFDM signal of the small unmanned aerial vehicle.

Description

technical field [0001] The present invention relates to the technical field of signal processing, in particular to a method for analyzing and demodulating a small unmanned aerial vehicle image transmission signal, which analyzes, estimates and blindly solves CP-OFDM signals under the condition of unknown CP-OFDM signal formats It is used to realize the perception and recognition of small UAV signals. Background technique [0002] With the transformation and development of drone technology, people's demand for drones is increasing day by day. Small drones have become a popular consumer product due to their small size, low noise, easy portability, and easy manipulation. . At present, the UAV market at home and abroad is developing rapidly, and more and more UAV enthusiasts have their own UAVs, but the problems caused by this are also becoming more and more prominent. Although drones bring convenience to users in the use of high-altitude shooting and aerial mounting, they als...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/438H04N7/18H04L27/26
CPCH04L27/265H04L27/2659H04L27/266H04N7/18H04N21/4382
Inventor 董政贾腾飞周波戴幻尧周志勇贾锐
Owner UNIT 63892 OF PLA