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A novel satellite signal FFT parallel-acquisition algorithm

A satellite signal and a new type of technology, applied in the field of satellite receivers, can solve the problems of limited integration time by bit flipping and high complexity of related calculations, and achieve the effects of prolonging coherent integration time, reducing calculation amount and high processing efficiency

Inactive Publication Date: 2017-05-31
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0004] Aiming at the problems of bit flipping, limited integration time and high complexity of related calculations in the weak GNSS signal capture process, the present invention provides a novel satellite signal FFT parallel capture algorithm

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  • A novel satellite signal FFT parallel-acquisition algorithm
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  • A novel satellite signal FFT parallel-acquisition algorithm

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Embodiment Construction

[0014] A novel satellite signal FFT parallel acquisition algorithm includes the following steps:

[0015] After the satellite signal is received by the receiver and processed by the RF front end, the digital down-conversion is converted into a digital intermediate frequency signal;

[0016] The digital intermediate frequency signal is multiplied by the local I branch carrier and the Q branch carrier to carry out the carrier removal process, and the I branch signal and the Q branch signal are obtained;

[0017] The I-branch signal and the Q-branch signal compose the carrier-removing result I+jQ in complex number form, perform Fourier transform on the carrier-removing result I+jQ in complex number form, and then combine the transform result with the Fourier transform of the local recurring signal The conjugate values ​​are multiplied, and the obtained product is inversely transformed by Fourier to obtain the correlation result in the time domain. In the process, the Fourier tran...

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Abstract

The invention relates to a novel satellite signal FFT parallel-acquisition algorithm widely applied to different satellite receivers. According to the invention, firstly, it is assumed that there is no bit flip; digital IF signals and local recurrent signals are subjected to cyclic correlation operation to get the related results; in the operation process, the FFT operation is divided into two parts of a sum to reduce the FFT operation points and calculated amount; and secondly, it is assumed that there is a bit flip; the digital IF signals and local recurrent signals are subjected to even-odd partitioning and correlation operation to obtain related result; meanwhile, in the operation process, the FFT operation is subjected to segmentation; and finally, the related results obtained at two times are compared, and the maximum is the maximum peak acquired. The novel parallel-acquisition algorithm designed by the invention can effectively overcome the problem of bit flip and prolong the coherence integration time. Compared with traditional acquisition algorithms, the calculated amount of the proposed novel acquisition algorithm is reduced. The whole process is relatively high in processing efficiency and relatively good in algorithm performance.

Description

technical field [0001] The invention relates to a novel satellite signal FFT parallel acquisition algorithm, which is widely applicable to different satellite receivers. Background technique [0002] The global positioning system GPS of the United States, the global satellite navigation system GLONASS of Russia, the Galileo satellite navigation system of Europe and the Beidou satellite navigation system of China are called the four major navigation systems in the world. In the process of positioning and navigation of the GNSS receiver, after the receiver antenna receives the satellite signal, it undergoes a series of processing at the RF front end, down-converts it into a digital intermediate frequency signal, and enters the signal acquisition process. Acquisition is to monitor the number of all visible satellites and estimate their corresponding Doppler frequency and code phase. The commonly used satellite signal acquisition algorithm is a parallel acquisition algorithm, w...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/24
CPCG01S19/24
Inventor 李灯熬赵菊敏邓豆豆
Owner TAIYUAN UNIV OF TECH
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