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Multipath error extraction method based on self-adaptive semi-soft threshold wavelet transform

A multi-path error, semi-soft threshold technology, applied in the direction of adaptive network, radio wave measurement system, satellite radio beacon positioning system, etc., can solve the discontinuity of hard threshold function, unable to express the decomposition coefficient energy distribution, influence Reconstruction accuracy and other problems, to achieve the effect of good elimination, strong adaptability, and stable performance

Active Publication Date: 2018-01-12
SOUTHEAST UNIV
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Problems solved by technology

In the traditional threshold function, the hard threshold function is discontinuous at the threshold point, and there is always a constant deviation between the wavelet coefficients obtained by the soft threshold function and the original coefficients, which affects the accuracy of reconstruction
At the same time, neither of these two threshold functions can express the energy distribution of the decomposed coefficients

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  • Multipath error extraction method based on self-adaptive semi-soft threshold wavelet transform
  • Multipath error extraction method based on self-adaptive semi-soft threshold wavelet transform
  • Multipath error extraction method based on self-adaptive semi-soft threshold wavelet transform

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[0029] Below in conjunction with specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of the present application.

[0030] The main idea of ​​the present invention is as follows: based on the low-frequency characteristics of the multipath signal, the properties of the wavelet coefficients of the multipath signal and other noise signals are different in scale, the corresponding threshold function is used to process the noisy multipath signal, and the multiple path signal.

[0031] Suppose the signal is s(k), the multipath signal to be extracted is m(k), and there is s(k)=m(k)+δ(k), and δ(k) is other noise signal...

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Abstract

The invention provides a multipath error extraction method based on self-adaptive semi-soft threshold wavelet transform. The multipath error extraction method is applied to the elimination of multi-path errors in a global satellite navigation system. The multipath error extraction method comprises the steps of: firstly, acquiring a residual value of a double-difference pseudo-range by using a satellite observation value, and regarding the residual value as signals to be processed; performing multi-scale analysis on the signals to be processed by using wavelet transform, and extracting a multipath signal to be processed from the signals; and filtering the multipath signal to be processed by means of an FIR filter to obtain a final multipath error signal, wherein a threshold function in wavelet transform adopts a self-defined semi-soft threshold function, and a self-adaptive method is adopted for searching a threshold point. The multipath error extraction method provided by the inventionhas the advantages of small calculation amount, fast calculation speed and high implementability, and is capable of self-adaptive adjustment according to different experimental environments, so as toachieve the best effect of suppressing multipath errors.

Description

technical field [0001] The invention relates to a method for extracting multipath errors based on self-adaptive semi-soft threshold wavelet transform, which is suitable for global satellite navigation systems and uses the extracted multipath errors to correct the system. Background technique [0002] The multipath effect is caused by not only direct signals but also non-direct signals (reflection, refraction, etc.) in the arriving signal. In the global satellite navigation system, especially the double-difference navigation system, the errors caused by satellite clock, satellite ephemeris, ionospheric delay and tropospheric delay can be greatly weakened, while the multipath error and receiver noise cannot be obtained. Any improvement, so the multipath error becomes the main source of error in the differential positioning system. The multipath signal is extracted by a certain method, and then the system is corrected by using the extracted multipath error signal, which can ov...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/22G01S19/41H03H17/00H03H21/00
Inventor 陈熙源张梦尧闫晣汤新华
Owner SOUTHEAST UNIV
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