Magnetic induction through-the-earth positioning method based on path loss

[0050] Embodiment 1 of the present invention provides a magnetic induction penetrating ground positioning method based on path loss. In the embodiment of the present invention, the transmitter of the system is a single-axis annular energized coil placed horizontally underground. The receiver is a three-axis orthogonal induction magnetic core coil placed on the ground, 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 transceivers. 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 direction and intensity of the magnetic induction penetrating positionin

[0067] In Embodiment 2 of the present invention, in order to determine the depth of the transmitter, the receiver Q on the ground in formula (22) 1 Magnetic induction penetrating positioning signal at point Carrying out vector decomposition, we get The horizontal component B of H1 and vertical component B Z1 , transform the spherical coordinate system used in formula (22) into a rectangular coordinate system, and Q 1 The spherical coordinates of the point (r′ 1 ,θ,φ 1 ) is simplified to (r 1 ,z), φ 1 Indicates that the receiver Q 1The angle between the line connecting with the intersection point C and the x-axis, z represents the distance between the transmitter and the ground, deduced with r 1 , the correspondence between z. combined Q 1 , the distance r between two points C 1 , according to Q 1 Magnetic induction penetrating positioning signal strength at a point The distance z between the transmitter and the ground is determined.

[0068] Such as Figure 4