JPS6047969B2 - Guided wireless mobile object position detection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to ``improvement of a method for detecting the location of a moving object using guided radio,'' and particularly relates to an improved method for detecting the position of a moving object using guided radio, and in particular, the present invention relates to an improved method for detecting the position of a moving object using guided radio, and in particular, the present invention relates to an improved method for detecting the position of a moving object using guided radio. The present invention relates to an improvement in a method for detecting the position of a moving body using guided radio, which detects the relative address of a moving body from a change in phase.

Inductive wireless mobile object position detection methods include the absolute address method, which detects the absolute address by varying the intersecting pitch of multiple pairs of intersecting parallel lines to generate an address code from the signal guided by the antenna, and the absolute address method, which detects the absolute address by varying the intersecting pitch of multiple pairs of intersecting parallel lines. There is a relative address method in which a signal guided to an antenna from a pair of crossed parallel lines repeats periodic phase changes from a reference point to detect a relative address.

The absolute location system can detect the exact position immediately even if the power is turned on again after a power outage, but because there are many logarithms, the line becomes thick and the equipment becomes large-scale. Also, since the relative number and land type has one logarithm, it is advantageous for burying a moving object such as a container crane in a concrete road surface, but when the power is turned back on after a power outage, the moving object becomes the reference point. It is inconvenient to use because it is necessary to calculate the exact position after positioning it at a point and correcting the position. Furthermore, if the crossing pitch of a pair of crossed parallel lines is increased, the resolution of position detection will decrease, and conversely, if the crossing pitch is decreased, the coupling with the antenna will be reduced, so it is necessary to reduce the distance between the antenna and the line. It had the disadvantage that the signal level decreased and the SN ratio also decreased.
The purpose of the present invention is to provide a relative address system that can perform position detection with high accuracy even with large intersecting pitches, and that can immediately correct the position without having to position the moving object at the reference point even if the power is turned on again after a power outage. An object of the present invention is to provide a method for detecting the position of a moving object using guided wireless.

Embodiments of the invention will be described in detail with reference to the drawings. FIG. 1 systematically shows an example of the method of the invention, in which different frequencies, for example 52.
8K? A main cross-type parallel line 10 and a cross-type parallel line 12 for position correction, each excited at 40 KHZ, are provided along the trajectory of the moving body.

The main crossing type parallel line 10 has intersections 10a at a short constant period (pitch) P of 1 to several cm, while the position correction crossing type parallel line 12 has intersections 10a at a long period P'' of several hundred meters.
Intersection 1 by shifting the interval (electrical angle) α from a
It has 2a. There are two antennas 14 and 15 on the moving body.
are mounted in a staggered arrangement along the cross-parallel lines 10, 12, and in the illustrated embodiment these antennas are even 112P apart from the main cross-parallel line 10.

Therefore, when the antennas 14 and 15 move together with the moving object,
Both antennas receive signals 1a, 16b, 18a as shown in FIG. 2, which are 900 degrees out of phase from the main crossed parallel line 10. Note that signals 16b and 18b whose phases are shifted by an extremely small angle are also received from the position correction crossing parallel line 12. The antennas 14 and 15 each have a duplexer 20A.
, 20B and 21A, 21B, and the duplexer 20A
, 21A filter the signals 16a, 18a coupled from the main crossing parallel line 10 to the antennas 14, 15, respectively;
On the other hand, the branching filters 20B and 21B filter the signals 16b and 18b coupled to the antennas 14 and 15 from the crossed parallel line 12 for position correction, respectively.

The signal 16a is directly input to the first addition circuit 22A for position detection, and is also input to the second addition circuit 26A for position detection via the 1801 phase shifter 24A.
is inputted to the first addition circuit 22A and the second addition circuit 26A via the 90 phase shifter 28A.

The output signals of the first and second adder circuits 22A and 26A are supplied to a position detection phase difference detector 30A that detects the phase difference between them. Now, when the antennas 14 and 15 are in the position shown in FIG.
The vector shown in FIG. 3A is obtained by shifting the phase of 8a by 900. The composite signal of the second adder circuit 26A is also represented by the vector G,6 as shown in FIG. 3A.
It is expressed as

The antennas 14 and 15 are moved 1 from this position in the direction of the arrow in Figure 2.
After moving by 14P, the composite signals R, 2, G, and 6 of the first and second adder circuits become as shown in FIG. 3B, respectively. When the antennas 14 and 15 move in the direction of the arrow in Figure 2 in this way, the vector G2 rotates counterclockwise and the vector Q26 rotates clockwise, and their phase difference is caused by the main intersection as shown in Figure 4. Intersection section of parallel lines 10 (adjacent intersection 10
a) and varies between 00 and 360. Therefore, it is possible to detect the position of the moving object within the intersection section from the angle signal corresponding to the phase difference detected by the phase difference detector 30A. On the other hand, the signals 16b and 18b are also phase-shifted in a similar manner and are combined by the first and second adder circuits 22B and 26B for position correction, and the phase difference detector 30B generates an angle signal for position correction.

In addition, in FIG. 1, the symbols 24B and 28B each represent 1.
80 shows phase shifters similar to phase shifters 24A and 90 and phase shifter 28A. As already mentioned, the intersections 12a of the position correction crossing parallel lines 12 are shifted at different angles from the intersections 10a of the main crossing parallel lines 10 for each correction point.
Figure 5 shows an example, with a distance of 2,300 feet (about 690 feet)
7T1. ) on the track, and if the distance between the intersections 10a and 12a is decreased for each correction point as shown in the upper row of the table, the angle for position detection when the angle of the angle signal for position correction is O. The angle of the signal is 22.5O, 67.5°...
337.5 angles, and the absolute address of each correction point is a different position from the reference point, for example, 100 feet (30T
L), 400 feet (120rrL),...22
00 feet (6607TL) and know its location. The correction position detector 32 shown in FIG. 1 is for detecting the angle of the position detection angle signal when the angle of the position correction angle signal is O, that is, the correction position (absolute address). According to the present invention, as described above, when detecting a relative address, the position of a moving object can be further detected even within the crossing section of crossed parallel lines, so the detection accuracy is significantly improved. Even if the power is turned on again, the absolute address can be known at the correction point, so there is no need to return the moving object to the reference point, making handling extremely easy.

[Brief explanation of the drawing]

Figure 1 is a schematic system diagram showing an example of the present invention, Figure 2 is a diagram showing the relationship between the positions of two antennas and received signals, and Figures A and B are vectors of the first and second combined signals. Figure 4 shows the relationship between the phase difference between the first and second composite signals and the line position, and Figure 5 shows the deviation of the intersection position between the main crossing parallel line and the position correction crossing parallel line. , is a table showing phase differences and absolute positions of angle signals. 10... Main crossing parallel lines, 12... Crossing parallel lines for position correction, 14, 15... Antenna, 16a, 16b, 18a, 18b... Reception Signal, 22A, 22B, 26A, 26B...1st
and the second adder circuit, 24A, 24B, 28A, 28B.
...Phase shifter, V22, V26...First and second
composite signal.

Claims (1)

[Claims] 1. An inductive wireless moving object that detects the relative address of a moving object from a change in the phase of a signal received by an antenna by coupling a pair of crossed parallel lines with an antenna on the moving object. In the position detection method, two antennas are arranged in a staggered manner along the pair of crossed parallel lines, and at least one of the received signals from these antennas is phase-shifted by a first angle and then both are combined. to generate a first composite signal, and to phase-shift at least one of the received signals from these antennas by a second angle and then combine them to generate a second composite signal; and a second composite signal are set to rotate in phase in opposite directions when the moving body moves along the intersecting parallel tracks, and an angle corresponding to the phase difference between the first and second composite signals is set. A method for detecting the position of a moving object using guided radio, characterized in that the position of the moving object within the crossing section of the crossing parallel lines is detected from the signal. 2. In the guided radio moving object position detection method for detecting the relative address of a moving object from a change in the phase of a signal received by an antenna by coupling a pair of crossed parallel lines and an antenna on the moving object, Two antennas are arranged in a staggered manner along a pair of crossed parallel lines, and at least one of the signals received from these antennas is phase-shifted by a first angle, and then both are combined to produce a first composite signal. at least one of the received signals from these antennas is phase-shifted by a second angle and then combined to generate a second combined signal, and these first and second combined signals are is set so that the moving object rotates in phase in the opposite direction when moving along the crossed parallel lines, and the crossed parallel lines are calculated from an angle signal corresponding to the phase difference between the first and second composite signals. Detecting the position of a moving object within a crossing section of railway tracks, and furthermore, having intersections at predetermined intervals of the crossing parallel lines at mutually different angular intervals with respect to the crossing points, and determining the frequency at which the crossing parallel lines are excited. Correcting crossed parallel lines excited at different frequencies are laid parallel to the crossed parallel lines, and the correcting received signal coupled to the two antennas is separated from the received signal from the corrected crossed parallel line. After receiving the signal, a position correction angle signal is generated through the same processing as the received signal, and the absolute address of the moving object is detected from the phase difference between the position detection angle signal and the position correction angle signal. A guided wireless moving object position detection method.