Space-time self-adaptive filtering method and device

A space-time self-adaptive and space-time filtering technology, which is applied in the field of communication, can solve problems affecting the stability of the loop in the receiver, increasing the complexity and cost of externally expanded memory, and limited memory resources, so as to improve the feasibility, The effect of slowly changing, smoothing noise

Inactive Publication Date: 2013-10-09
BEIJING BDSTAR NAVIGATION CO LTD
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Problems solved by technology

[0004] First of all, when calculating the space-time adaptive coefficient, it is necessary to collect multi-channel baseband data for a period of time and save it in the memory. When the number of array elements is large, the amount of data to be stored will be quite large. is relatively limited, and external memory expansion will increase complexity and cost
[0005] In addition, even in a static scene, due to the presence of noise in the space, additional noise will be introduced during the system processing. The coefficients calculated by the conventional space-time adaptive algorithm will have large fluctuations each time, and the coefficient fluctuations will pass through the space. The time filter is passed to the intermediate frequency signal sent to the navigation receiver, which affects the stability of the loop work in the receiver

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  • Space-time self-adaptive filtering method and device

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Embodiment 1

[0055] Embodiment 1, a space-time adaptive filtering method, such as figure 1 shown, including:

[0056] Obtain and store multi-channel baseband data;

[0057] Calculate the space-time adaptive filter coefficient w according to the stored multi-channel baseband data;

[0058] smoothing the space-time adaptive filter coefficient w to obtain the smoothed coefficient w smooth ;

[0059] According to the smoothed coefficient w smooth Space-time filtering is performed on the acquired multi-channel baseband data.

[0060] In this embodiment, in order to make the coefficients change more smoothly, the coefficient w is smoothed, and the smoothed coefficients are applied to the space-time filter to filter the baseband data and output useful signals, which can improve the space-time self-efficacy. Adapt to problems caused by fluctuations in filter coefficients.

[0061] In an implementation manner of this embodiment, the step of acquiring and storing multi-channel baseband data ma...

Embodiment 2

[0116] Embodiment 2, a space-time adaptive filtering device, such as image 3 shown, including:

[0117] storage unit, space-time filter;

[0118] a sampling unit, configured to obtain multi-channel baseband data and store it in the storage unit;

[0119] A coefficient calculation unit, configured to calculate the space-time adaptive filter coefficient w according to the stored multi-channel baseband data;

[0120] A coefficient smoothing unit, configured to smooth the space-time adaptive filter coefficient w to obtain a smoothed coefficient w smooth ;

[0121] The space-time filter is used according to the smoothed coefficient w smooth performing space-time filtering on the multi-channel baseband data acquired by the sampling unit.

[0122] In an implementation manner of this embodiment, the sampling unit includes:

[0123] An analog-to-digital converter is used to collect multi-channel intermediate frequency signals whose data length is P points; P is a positive intege...

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Abstract

The invention discloses a space-time self-adaptive filtering method and device. The space-time self-adaptive filtering method includes the steps of obtaining and storing multi-channel base band data, calculating the space-time self-adaptive filtering coefficient w according to the stored multi-channel base band data, carrying out smoothing processing on the space-time self-adaptive filtering coefficient w, obtaining the smoothed coefficient w<smooth>, and carrying out space-time filtering on the obtained multi-channel base band data according to the smoothed coefficient w<smooth>. The space-time self-adaptive filtering method and device can slow down the fluctuations of the space-time self-adaptive filter coefficients.

Description

technical field [0001] The present invention relates to the communication field, in particular to a space-time adaptive filtering method and device. Background technique [0002] The electromagnetic environment in actual communication is quite complex, and there are man-made interferences with various patterns and time-varying statistical characteristics, especially the narrowband and broadband interference with high power density has become one of the most important factors to destroy the communication system. Interference will prolong the acquisition time of the receiver, increase the probability of false alarms, and seriously cause the receiver to lose lock and fail to work. Therefore, it is very necessary to carry out the research on anti-jamming technology of satellite navigation receiver, which will provide guarantee for the normal operation of satellite navigation receiver. So far, space-time adaptive filtering technology is the main method to improve the anti-jammin...

Claims

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Application Information

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IPC IPC(8): H03H21/00
Inventor 不公告发明人
Owner BEIJING BDSTAR NAVIGATION CO LTD
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