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Burst signal detection and carrier synchronization method under rotor shielding

A burst signal and carrier synchronization technology, applied in the field of satellite communication, can solve the problems of large Doppler dynamics, rotor occlusion, and low link signal-to-noise ratio, achieving strong versatility, guaranteed performance, and convenient satellite link automatic adapting to the effect of communication

Active Publication Date: 2019-07-30
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0004] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a method for burst signal detection and carrier synchronization under the cover of the rotor, and to solve the problem of large Doppler dynamics and link signal noise in helicopter satellite communications. Problems such as low ratio and rotor occlusion

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  • Burst signal detection and carrier synchronization method under rotor shielding
  • Burst signal detection and carrier synchronization method under rotor shielding

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Embodiment Construction

[0038] A burst signal detection and carrier synchronization method under the shielding of a rotor, comprising: burst signal detection, frequency offset and frequency change rate estimation, and phase offset estimation.

[0039] Burst signal detection: In order to improve the detection performance under high Doppler dynamic conditions, after the received signal is conjugated with the local pilot code and demodulated, the frequency change rate is preset in partitions, and the K-channel parallel spectrum peak characteristic detection is performed;

[0040] Frequency offset and frequency change rate estimation: The frequency offset and frequency change rate iterative estimation method is used to improve the frequency offset estimation accuracy and complete the frequency change rate estimation. The specific steps are: ① Divide the pilot signal into two segments, and use the data-assisted frequency offset estimation algorithm to obtain the frequency offset with ② Use the differen...

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Abstract

The invention discloses a burst signal detection and carrier synchronization method under rotor shielding, and belongs to the technical field of satellite communication. The method comprises the stepsof burst signal detection, frequency offset and frequency change rate estimation and phase offset estimation. Burst signal detection and carrier synchronization are sequentially completed based on dispersedly inserted pilot symbols, the signal receiving problem under the conditions of high Doppler dynamics, low link signal-to-noise ratio and rotor shielding is solved, and the method has a wide application prospect in helicopter satellite communication.

Description

technical field [0001] The invention relates to a burst signal detection and carrier synchronization method under the cover of a rotor, belonging to the technical field of satellite communication. Background technique [0002] Helicopter satellite communication refers to the direct communication between the helicopter and the satellite through the onboard satellite equipment. It is characterized in that the helicopter does not need the ground relay station for relay and forwarding in the communication, and is not affected by the ground fluctuation, so it can carry out information transmission in a wider area. . In satellite communication systems, Doppler frequency shift is an important factor affecting communication performance. Due to the relative motion between the satellite platform and the ground terminal, its radial motion speed produces the Doppler effect, which leads to the Doppler frequency shift of the signal at the receiving end. For a helicopter with high maneuv...

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Application Information

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IPC IPC(8): H04B7/185
CPCH04B7/18519
Inventor 王大庆龚险峰刘明洋惠腾飞
Owner XIAN INSTITUE OF SPACE RADIO TECH
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