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High-precision detection and compensation method for Doppler frequency shift in airborne satellite communication

A technology of Doppler frequency shift and satellite communication, which is applied in the field of Doppler frequency shift detection and compensation of airborne satellite communication in motion, and can solve the problems such as the opposite direction of frequency interpolation.

Active Publication Date: 2016-08-10
PANDA ELECTRONICS GROUP +1
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Problems solved by technology

In the case of noise, when δ is small, the amplitude of the first side lobe on the other side of the maximum value of the FFT spectrum (the second largest relative amplitude) may exceed the second largest value in the main lobe, resulting in frequency interpolation In the opposite direction, causing a large frequency estimation error

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  • High-precision detection and compensation method for Doppler frequency shift in airborne satellite communication
  • High-precision detection and compensation method for Doppler frequency shift in airborne satellite communication
  • High-precision detection and compensation method for Doppler frequency shift in airborne satellite communication

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Embodiment Construction

[0031] The overall block diagram is as figure 1 shown.

[0032] 1), the present invention proposes a method for correcting Doppler frequency shift in airborne satellite communication in the mid-frequency band. This method estimates the frequency difference through the pilot channel, and then adjusts the 10MHz reference source by changing the DDS output frequency in the intermediate frequency unit, and the demodulator at the back end does not need to process the Doppler frequency difference.

[0033] 2), the present invention proposes a Rife pilot frequency estimation algorithm based on frequency difference correction to detect satellite communication Doppler frequency shift, such as figure 2 shown.

[0034] Due to the fence effect in the FFT operation, when the frequency of the input signal is not at the FFT quantization frequency point, directly use the maximum spectral line position of the FFT operation to estimate the frequency of the sinusoidal input signal, there will ...

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Abstract

The invention discloses a high-precision detection and compensation method for Doppler frequency shift in airborne satellite communication. The method is characterized in that a Rife interpolation correction algorithm based on FFT is used for amending a frequency difference, namely a pilot carrier frequency estimation algorithm is used for detecting the Doppler frequency shift in satellite communication; as the FFT computation has a picket fence effect, when the frequency of an input signal is not located at an FFT quantized frequency point, the frequency of a sinusoidal input signal is estimated by directly using the maximal spectral line location, and thus a quantization error is generated; and within the time of 0 to T, single-frequency sinusoidal signals in an additive white Gaussian noise background are sampled, and thus a sample sequence is obtained. According to the method, the Doppler frequency shift in satellite communication is detected by the Rife pilot carrier frequency estimation algorithm based on frequency different amendment, and thus the Doppler frequency shift compensation on downlink signals is achieved.

Description

1. Technical field [0001] The invention belongs to the field of satellite communication, and in particular relates to a Doppler frequency shift detection and compensation method for airborne mobile satellite communication. 2. Background technology [0002] The Doppler frequency shift is caused by the relative motion between the transmitting source and the receiver. As a high-speed moving carrier, the relative motion between the aircraft and the satellite is fast, and the satellite communication uses a higher frequency band (such as Ka or Ku frequency band) , there will be a large range of severe Doppler frequency shift changes in the airborne satellite communication link, which will lead to low receiver sensitivity and increase the system bit error rate, so the Doppler frequency shift must be compensated. [0003] Set the speed of light to V C , the Doppler frequency offset is Δf doppler , the projection of the relative motion velocity vector V in the direction of the tran...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00
CPCH04L27/0014H04L2027/0065
Inventor 刘立伟杨书奎邓世明南淑君
Owner PANDA ELECTRONICS GROUP
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