A Noise Reduction Method for Through-the-Earth Positioning Signal Based on Frequency Point Amplitude Acquisition
A positioning signal and frequency domain amplitude technology, applied in ground navigation, transmission systems, electrical components, etc., to reduce the impact and improve positioning accuracy
Active Publication Date: 2022-03-01
BEIJING JIAOTONG UNIV
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0007] The object of the present invention is to provide a kind of noise reduction method based on the through-the-earth positioning signal collected by the amplitude of the frequency point that eliminates the influence of the geomagnetic noise when the through-the-ground signal propagates in the earth medium, and makes the through-the-earth positioning more accurate, so as to solve the above-mentioned problem. At least one technical problem in the background technology
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0043] Such as figure 1 As shown, in the embodiment of the present invention, the transmitter is a single-axis multi-turn annular energized coil placed horizontally underground, and the two receivers at different positions on the ground are three-axis orthogonal induction magnetic core coil sensors, One axis of the coil is perpendicular to the horizontal ground and the other two axes are parallel to the horizontal ground. There is a conductive earth medium between the transmitter and receiver. There is a sinusoidal current of a certain frequency (such as 10Hz) in the multi-turn coil of the transmitter. The quasi-static magnetic field excited by the current passes through the earth medium to the receiver on the ground, and is respectively at the two ends of the three magnetic core coils of the receiver. The induced voltage signal is generated, and the receiver can restore the induced voltage signal to a magnetic induction penetrating positioning signal. figure 1 The magnetic ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a noise reduction method of a ground-penetrating positioning signal based on frequency point amplitude acquisition, and belongs to the technical field of noise reduction of the ground-penetrating positioning signal. In this method, after the discrete Fourier transform is performed on the magnetically induced through-the-earth positioning signals collected at multiple points, the frequency domain amplitude corresponding to the magnetically induced through-the-earth positioning signal on the frequency spectrum is collected, and the collected frequency-domain amplitude is converted into the corresponding time-domain amplitude. The invention deduces the corresponding relationship between the amplitude of the sinusoidal ground-penetrating positioning signal in the frequency domain and the amplitude in the time domain, and converts the peak pulse amplitude at the frequency of the ground-penetrating positioning signal on the frequency spectrum into the time of the signal. Domain amplitude, because the discrete Fourier transform produces many frequency points on the spectrum, and the converted frequency domain signal is only one of them, occupying an extremely narrow bandwidth, and the proportion of doped geomagnetic noise is extremely low , reducing the impact of geomagnetic noise on the accuracy of the magnetic induction through-the-earth positioning signal, and improving the positioning accuracy of the through-the-earth positioning system.
Description
technical field [0001] The invention relates to the technical field of noise reduction of ground-penetrating positioning signals, in particular to a noise-reducing method of ground-penetrating positioning signals based on frequency point amplitude acquisition. Background technique [0002] Ground-penetrating positioning technology plays an important role in mine disaster rescue, tunnel construction and underground navigation. However, in the ground medium, electromagnetic waves are easily affected by medium changes or obstacles, and significant attenuation and multipath phenomena occur when passing through media such as rocks or water, which will seriously affect the transmission distance and positioning accuracy of ground-penetrating positioning signals . The extremely low frequency magnetic induction signal can greatly reduce the loss of the conductive earth medium to the electromagnetic field. The quasi-static magnetic field has no scattered field, and there will be no ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/08H04B13/02
CPCG01C21/08H04B13/02
Inventor 田文龙杨维
Owner BEIJING JIAOTONG UNIV