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Interference suppression method and device based on BeiDou-I satellite signal reception

An interference suppression, satellite signal technology, applied in satellite radio beacon positioning systems, measurement devices, instruments, etc., can solve the problem that the function and performance cannot meet the needs of engineering applications, achieve easy implementation and optimization, reduce signal-to-noise ratio, The effect of preventing misjudgment

Active Publication Date: 2011-07-13
宁波喵走科技有限公司 +1
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Problems solved by technology

[0007] The static application equipment of Beidou first-generation satellites has strict requirements on the size and power consumption of the signal receiving part circuit, and the real-time performance of signal processing. At present, the development of Beidou special chips is still in its infancy, and its functions and performance cannot meet engineering applications. need

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  • Interference suppression method and device based on BeiDou-I satellite signal reception
  • Interference suppression method and device based on BeiDou-I satellite signal reception
  • Interference suppression method and device based on BeiDou-I satellite signal reception

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Embodiment Construction

[0044] DSSS spread spectrum modulation itself has a certain anti-interference ability, and the power of the narrow-band interference signal that usually affects the work of the Beidou receiving device is significantly higher than that of the Beidou signal. Due to the automatic gain control, the Beidou intermediate frequency power is stable, and the analysis of the intermediate frequency signal spectrum can clearly identify the interference signal and the useful signal. In actual operation, the spectrum amplitude of the non-interfering signal can be used as the basis for judging interference, such as the median value and mean value of the spectrum. Based on the stable power of the Beidou first-generation signal, the present invention provides a simple and efficient adaptive threshold calculation method, which dynamically adjusts the threshold in combination with the spectrum mean value when there is no interference and the updated threshold mean value. Specifically:

[0045] S...

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Abstract

The invention relates to an interference suppression method based on BeiDou-I satellite signal reception. The method comprises the following steps of: (1) receiving N*(1-theta) BeiDou digital intermediate-frequency data and buffering the front N*theta sampling point data; (2) selecting window functions with the window length of N, combining the received N*(1-theta) BeiDou digital intermediate-frequency data and the received front N*theta sampling point data into N data to be analyzed in time sequence and sequentially multiplying the N data to be analyzed by N window function quotients; (3) carrying out FFT (Fast Fourier Transform) on the N data subjected to windowing treatment and storing the real part data and the imaginary part data of the N frequency points subjected to FFT; (4) calculating the module values of the frequency points subjected to the FFT; (5) calculating a threshold value according to the average value of the module values and the module values the current batch of data under a non-interference environment; (6) calculating attenuation quotients corresponding to interference frequency points; (7) attenuating according to the interference frequency point positions and the attenuation quotients which are acquired through calculation; and (8) carrying out IFFT (Inverse Fast Fourier Transform) on a frequency domain signal subjected to interference suppression.

Description

technical field [0001] The invention relates to a signal interference suppression method, in particular to an interference suppression method for Beidou first-generation satellite signals. Background technique [0002] The Beidou first-generation satellite navigation system belongs to the Radio Determination Satellite Service (RDSS), and its satellite air-to-ground signals work in the S-band (2483.5MHz~2500MHz), using direct sequence spread spectrum (DS-SS) technology. The 2.4G ISM is a license-free frequency band commonly used in the world. There are multiple wireless communication standards such as Wi-Fi, Bluetooth, and ZigBee in this frequency band. The related interference sources are complicated, which has a serious impact on the capture and tracking of Beidou signals. Therefore, it is necessary to perform interference suppression processing on the received signal, usually using adaptive antenna technology, radio frequency out-of-band filtering technology, narrow-band i...

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Application Information

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IPC IPC(8): G01S19/21H04B7/185
Inventor 贾小波吴淑琴张筱南陈煜聪孙进卿
Owner 宁波喵走科技有限公司
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