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A Doppler frequency offset estimation system and method in a highly dynamic environment

A technology of Doppler frequency offset and high dynamic environment, applied in the field of deep space measurement and control system, to achieve the effect of low cost, easy implementation and saving search time

Active Publication Date: 2017-07-25
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

In order to solve the problem that the existing technology cannot effectively estimate the Doppler frequency offset for low signal-to-noise ratio signals in a high dynamic environment

Method used

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  • A Doppler frequency offset estimation system and method in a highly dynamic environment
  • A Doppler frequency offset estimation system and method in a highly dynamic environment
  • A Doppler frequency offset estimation system and method in a highly dynamic environment

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Embodiment Construction

[0040] In order to clearly illustrate the solutions in the present invention, preferred embodiments are given below and detailed descriptions are given in conjunction with the accompanying drawings.

[0041] see figure 1 , figure 1 It is a signal processing flowchart of the present invention, and the Doppler frequency offset estimation system includes: a data receiving module, a shaping filter module, a Doppler frequency offset rough estimation module, and a Doppler frequency offset fine estimation module.

[0042] The data receiving module is responsible for receiving, storing and forwarding the signal sent by the ground terminal station in real time, and sending it to the subsequent processing module. After the received data is demodulated, it is sent to the Doppler frequency offset coarse estimation module through the processing of the shaping filter module. The coarse estimation module of Doppler frequency offset performs coarse estimation of Doppler frequency offset on ...

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Abstract

The invention claims for protecting a system and a method for estimating Doppler frequency offset under a high-dynamic environment. The method comprises the following steps: receiving data by the system and demodulating the data, and then, processing the data through a forming filter module and sending the processed data into a Doppler frequency offset estimation module; performing Doppler frequency offset estimation on signals by the Doppler frequency offset estimation module; sending an estimated value into the Doppler frequency offset estimation module, and processing to obtain an accurate value. According to the system and the method disclosed by the invention, after two mutually orthogonal data are directly multiplied, spectral analysis is performed to obtain a crude estimated value of the Doppler frequency offset, and by combining a time-frequency two-dimension search method, the accurate Doppler frequency offset estimation on low-signal to noise ratio signals under the high-dynamic condition can be realized; the signal frequency search time can be saved, and moreover, the system and the method are effective for the low-signal to noise ratio signals.

Description

technical field [0001] The invention relates to the technical field of signal processing and is suitable for deep space measurement and control systems. Background technique [0002] Deep space exploration is the embodiment of a country's comprehensive national strength and scientific and technological level, and it is an inevitable choice for the development of China's space activities. After more than 40 years of aviation practice, China has the strength to carry out deep space exploration research in terms of technical foundation, facilities, and personnel, and China is also on the road to deep space exploration. The successful launch of the "Chang'e" lunar exploration spacecraft is the third milestone in China's space activities following the launch of artificial earth satellites and manned spaceflight. In the Sino-Russian joint Mars exploration project in cooperation with Russia, China's exploration satellite "Yinghuo-1" will realize China's first exploration of the sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L25/03
Inventor 田增山刘忆米刚张振源
Owner CHONGQING UNIV OF POSTS & TELECOMM
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