JPS6015027B2 - Mobile object position detection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a moving body position detection method that detects the position of a moving body using electromagnetic induction.

FIG. 1 shows an example of a conventional mobile body position detection method of this type.

In the conventional method, an oscillator 2 is mounted on a moving body 1, and a reference body 3 is mounted on the fixed side. and observation pair 3 consisting of multiple intersecting pairs.
,,32,33 are set up, and observation pair 33 is observation pair 3.
, and the observation pair 33
has a crossing pitch 1'2 times that of the observation pair 32. Note that 4o, 4·, 42, and 43 are matching transformers, and 5o, 51, 52, and 53 are terminating resistors.
In this method, when the moving object 1 is at the position shown in the figure, the oscillator 2 generates a reference pair 3. and electromagnetic induction is made to each observation pair 3., 32, 33, and the reference pair 3 at that position. and each observation pair 3,,32,3. The phase of the induced voltage for
”, the reference pair 3o and each observation pair 3o detected at the receiving end. , 32. The phase of 33 is the reference pair 3. and observation pair 3, since no phase inversion is performed, ``1c observation pair 32 undergoes one phase inversion, so ``0 observation pair 33 is 3
Since the phase is inverted twice, it becomes "0". Each observation pair 3
,,32,33 receive phase is reference pair 3. If it is set as "1" when the phase is in the same phase as "0" when it is in the opposite phase, it can be seen that the mobile object 1 at the illustrated position exists in the field of 10.

However, in such a system, since the oscillator must be mounted on the mobile object, there are various problems such as how to supply power to the oscillator.

SUMMARY OF THE INVENTION An object of the present invention is to provide a moving object position detection method that can detect the position without installing an oscillator in the moving object. Hereinafter, specific examples of the present invention will be described in detail with reference to the drawings.

In the present invention, as shown in FIG. 2, the resonant circuit 6 is mounted on the moving body 1, but no oscillator is mounted thereon. In order to make the resonant circuit 6 resonate, a transmitting pair 7 is fixedly installed on the fixed side along a plurality of observation pairs 3, 32, 33 consisting of crossed pairs with different crossing pitches, and the oscillator 2 on the fixed side is connected to this transmitting pair 7. Power is supplied at a certain frequency from the source. in this case,
Since the oscillator 2 is on the fixed side, power can be easily supplied to the oscillator 2 from the power supply. Note that 9 is a matching transformer for the transmission pair 7, and 10 is a terminating resistor. Also,
In the present invention, a reference pair 3o is fixedly installed along observation pairs 3, 32, and 33, and the phase signal received at the receiving end of this reference pair 3o is used as a reference for reception of other observation pairs 3, 32, and 33. I try to judge the phase received at the edge.

According to the present invention, when the transmitting pair 7 is excited by the fixed oscillator 2, the resonant circuit 6 of the moving body 1 resonates due to electromagnetic transfer.

The transmitting pair 7 and the resonant circuit 6 have good electromagnetic coupling, but the transmitting pair 7 and the reference pair 3 have good electromagnetic coupling. and observation pairs 3, 32, and 33, consideration is given to prevent or prevent electromagnetic coupling. For example, send pair 7 to other pair 3. ~33, so that the moving body 1 moves between the transmitting pair 7 and the other pairs 3o~33. As the moving body 1 moves, the resonant circuit 6 in a resonant state also moves, and the reference pair 3 is reached at each layer. and observation pairs 3,,32,33
electromagnetically coupled with. For example, assuming that the moving body 1 exists at the illustrated position, the reference pair 3 at that position. And assuming that the phase of the induced voltage for each observation pair 3, , 32, 33 is "IJ," the reference pair 3. And each observation pair 3, , 32, 33
The phase detected by the receiver of reference pair 3o is 1 because no phase inversion is performed, and 0 because observation pair 3 is inverted once, and 0 for observation pair 3. Since the inversion is performed, the "1C observation pair 33" becomes "1" because the phase inversion is performed four times. At the receiving end, the phase difference between the received phase of the reference pair 3o and the received phase of each observation pair 3, 32, and 33 is detected, and when the phase difference is oo, it is expressed as "1 h 180 o
If the time is "0", then the moving body 1 at the illustrated position
It can be seen that it exists at address 011. Next, standard pair 3 in the present invention.

The advantages of performing phase comparison between the observation pairs 3, 32, and 33 will be explained with reference to FIGS. 3 to 5. When the moving body 1 is at the position A, the voltage induced in the resonant circuit 6 is Vr with respect to the transmission voltage Vs, and this voltage Vr causes the voltage to be lower than the reference voltage Vr. The voltages induced in observation pair 3 and 3 are Vo, respectively.
V, and the reference vs. 3. The phase difference obtained from observation pair 3 and 3 is 00. If mobile 1 is in position B, then reference pair 3.

The voltages induced in observation pair 3 and 3 are Vo' and V, respectively.
,', and the phase difference is 1800. In this way, the reference pair 3 depends on which intersection section of the observation pair 3 the resonant circuit 6 is coupled to. If the phase difference between and observation pair 3 is 00 or 1
800, the position can be determined by observing the phases of a plurality of observation pairs having different intersecting pitches and comparing them with the phase of the reference pair 3o. In this case, if the transmitting pair 7 is used as a reference without using the reference pair 3o, the phase difference will not necessarily be 00 or 1800 due to the presence of a signal directly induced from the transmitting pair 7 to the observed pair 3. However, in the present invention, since the reference pair 3o is used, such problems do not occur.

Although the present embodiment shows the case where three observation pairs are used, the position detection accuracy can be further improved by increasing the number of observation pairs and shortening the crossing pitch.

Further, in the above embodiment, the transmission pair and the reference pair are shown as non-crossing pairs, but if there is an influence of external noise, it is preferable to use crossing pairs for these pairs as well.

In this case, it is necessary to change the intersection position of each observation pair from the illustrated state. As explained above, in the moving object position detection method according to the present invention, a transmitting pair is provided, the resonant circuit of the moving object is oscillated by the transmitting pair, and the resonant circuit and the observation pair are electromagnetically coupled. , there is no need to mount an oscillator on the moving object, and therefore there is no need to supply power to the moving object, making implementation easier.

In addition, in the present invention, a reference pair is provided and the phase difference with other observation pairs is detected using the phase of this reference pair as a reference, so the phase difference is always 00 or 1800, which facilitates signal processing. It is possible to obtain sufficient accuracy in position detection.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the line configuration in the subordinate moving body position detection method, FIG. 2 is a diagram showing the line configuration in the mobile body position detection method according to the present invention, and FIG. 3 is an explanation of the operation in the method of the present invention. The line configuration diagrams, Figures 4 and 5 for
FIG. 3 is a vector diagram of received voltages of a reference pair and an observation pair at positions A and B in the figure. 1... moving object, 2... oscillator, 3. ...Reference pair, 3,~33...Observation pair, 6...
・Resonant circuit. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. Supply power at a required frequency to the transmitting pair by an oscillator on the fixed side, and excite the resonant circuit of the moving body moving along the transmitting pair with the transmitting pair, so that the transmitting pair The phase of the signal induced from the resonant circuit is determined for a plurality of observation pairs consisting of different intersecting pairs of intersecting pitches arranged apart from each other along the moving path of the mobile object, and the phase of the signal is also arranged along the moving path of the moving body with the observation pairs. A moving body position detection method characterized in that the phase of a signal induced from the resonant circuit is detected with respect to a reference pair that is set as a reference pair, and the position of the moving body is detected from this phase signal.