JPS60239682A - Apparatus for detecting position of moving body by inductive radio - Google Patents

Abstract

PURPOSE:To obtain a large number of position signals by the reduced number of induction loops, by a method wherein the inside and outside of a loop are applied to the code allotment of a position signal and a plurality of bits are allotted in parallel to the running path of one loop and a reference signal loop is added. CONSTITUTION:An induction loop (a) for passing an induction communication line is constituted at the boundary between 0 and 1 as a position signal and a reference signal loop (b) is arranged along an added code line to constitute a single line induction loop. Herein, A1, A2,...A0 show the positions of receiving loop antennae in the side of a moving body. Now, when a current is flowed, a magnetic field is formed corresponding to the flow direction and intensity thereof and the level thereof is changed by detection place and direction. If attention is paid to only a vertical magnetic field, there is level change inside and outside the loop by the effect of a circumferential loop but, if only a phase is considered, only the same phase or the inverse phase is present and a magnetic field comes to zero on the loop or in the narrow range in the vicinity of said loop and the outside of the loop comes to the inverse phase. Therefore, by constituting the induction loop, a large number of position signals are easily constituted.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a crane I truck 2 that runs on a constant running track.
The present invention relates to a moving body position detection device using guided radio that detects the running route of a train or the like from above the train using an absolute address.

[Prior art]

Previously, Japanese Patent Publication No. 56-1270, Japanese Patent Publication No. 59-37
As shown in Publication No. 65, Japanese Patent Publication No. 58-55461, etc., an inductive radio position detection device uses the fact that two parallel lines intersect at a section dividing point, and the phase of the induced magnetic field is reversed due to the intersection. is known to be.

Among these prior art materials, for example,
A guided radio loop applied to a moving body position detection device disclosed in Japanese Patent No. 3765 will be briefly described. Figure 1 is a configuration diagram of the guided transmission loop of the absolute position detection system using the parallel two-line crossing method shown in this prior art document. Illustrated by example.

In FIG. 1, 1-1 to 1-4 are guided radio transmitters, and 2-1 to 2-4 are guided radio transmission loops corresponding to respective bits for generating position signals.

The phase of the magnetic field is reversed (180°) at each intersection of the inductive radio transmission loops 2-1 to 2-4 caused by the currents transmitted from the inductive radio transmitters 1-1 to 1-4.

Therefore, on the receiving side, by detecting the inversion, it detects "0" to "1" or "1" to "0", and the combination of multiple bits, for example, in the case of 4 bits, 2 = 16 interval signals can be configured as absolute positions. FIG. 2 is an example of alternating encoding showing the encoding of Table 16.

In the conventional crossed guided radio transmission loop, many guided radio transmission loops and guided radio transmitters are required to obtain many demarcation points, and therefore many frequencies are required.

Furthermore, since there is no signal indicating the reference phase, it cannot necessarily be said that absolute position detection is performed. This is because the first position must be used as the reference phase.

[Summary of the invention]

This invention was made with the aim of improving such drawbacks, and focuses on the fact that in an induction loop, the phase of the vertical magnetic field is reversed inside and outside the induction loop, and assigns the inside and outside of the loop to the sign side of the position signal. By allocating multiple bits in parallel along the travel path in one loop and also adding a reference signal loop tube, it is possible to obtain many position signals with a small number of induction loops and an induction radio transmitter. The present invention proposes a moving object position detection device using guided radio that can be used to detect the position of a mobile object.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a mobile body position detection device using guided radio according to the present invention will be described based on the drawings. FIG. 3 shows an example of the configuration of an induction loop applied to this embodiment. In this Fig. 3, an inductive loop is constructed that passes an inductive communication helix through the boundary between "0" and "1" as position signals, and the starting end,
The same induction loop can be connected to the terminal end.

In addition, in FIG. 3, a and b indicate the wiring configuration, and a
is the induction loop, b is the reference signal loop, and this third
The figure shows an example of a single-digit inductive loop. Ha1, A
2, A4, A9, An are rlJ, r2J
, r4J, r8J and the positions of the receiving loop antennas on the mobile side corresponding to the reference signals.

Further, FIG. 4 shows an example of the configuration of a multi-digit induction loop. In this Figure 4,! L1-1. b1-1~a1-n, b
1-n correspond to the wiring configurations a and b (hereinafter, the wiring configuration is referred to as a loop) in FIG. 3, and 16 signals are created n times.

A terminating resistor Ro is connected to the end of the loop aj-1, bl-1 at the very beginning. i & terminal loop a1-n
, bl-n are connected to an inductive radio transmitter LO. The transmission frequency of this guided radio loop Lo is f.

Thereafter, in the same manner, the loop a2-1 at the starting end. b2-1
Terminating resistors R1 to Rn are connected to the loops an-1 and bn-1, respectively. In the loop a2-m and b2-rn at the final end of the loop, a guided radio transmitter L1 is installed.
is connected. The transmission frequency of this guided radio transmitter L1 is 1df1.

Further, a guided radio transmitter Ln is connected to the ends of the loops an-1 and bnl. This guided radio transmitter Ln
The transmission frequency of is fn.

Loop a2 1 e b21~a2 m m b2 m
...””a.

'*bnl+terminating resistor R0~Rn1 inductive wireless transmitter L
i to Ln and transmission frequencies fl to fn are also configured according to the digit of each signal6. Note that the sections in the multi-digit detection loop are divided into sections in the form of '/16' in the hexadecimal system, for example, by exponentiation of multiple bits. It is something that can be done.

On the other hand, the loop a1-1゜bl corresponding to each of these digits
+, az j+b2 L song "'n1.bn'" It is better to save space by arranging them on the same plane one on top of the other. In Figure 5, each antenna AI, A2.A4゜A8.AO (7) output is the approach case pull C1, C2゜C4, C8, Co.
and level setters El, E2. 'E, 4. E8゜F
O4- through bandpass filters Fl, F2. F4゜F
B. It is designed to be input to FO.

These bandpass filters F1. F2. F4°F8.
The arrows shown at each input end of the FO indicate bandpass filters Fl, F, 2 . F4°F9. FO, limiter LA1. Li2, Li4゜LAO
, LAO, multiplier 1 circuit M1*M2tM4tM8e 1. 2. 4. 8, level determiner DI, D2°D4. D8 is connected so that signals of separate wave numbers can be input.

The above bandpass filters F'1, F2. F4. F.B.

Antenna AI input to FO, A2. A4. A8°AO's output signal is then extracted with a frequency of a predetermined bandwidth and sent to the limiter LA1. Li2, Li4,
LAO.

It is input to LAO, where it is waveform-shaped into a pulsed rectangular wave signal, and sent to limigators LAI, Li2, L.
i4.

The outputs of Li9 are respectively multiplied by p:circuit M1. M2#M41
Sent to MB.

Multiplication circuit M1. M2. M4. For M8, limiter LA
The output of M1, M2, .O is also input as a reference phase signal. M4. M8 are limiters LA1, Li2, Li4, LAO respectively
The output of limiter LAO is multiplied by the output of limiter LAO, and the multiplication result is output to detectors 1, 2, 4, and 8 for detection, and the detected output is sent to level determiners DI, D2, . D4
．． Send to DI3. Each level determiner DI, D2. I)
4. Demodulated outputs are obtained from each DB.

Note that the multiplier circuits M1, M2 . M4. M8 may each use a multiplication amplifier or a logical product (AND) circuit.

Each of the above antennas AI, A2. A4. A8. A.O.

Approach cable CI, C2, C4, CB, Co.

Level determiner DI, D2. D4. DB, bandpass filter/F1, F2. F4. FB, FO, Rimi 7/L
A1jLA2, 'LA4, LAO, LAO, -
.--multiplying circuit M1. M2゜M4. M & detector K
1, K 2 e K 4 # K 8 have the same characteristics, and each suffix is attached in accordance with the encoding of the position signal. To use bare several digits, the digit must be By branching out and connecting the corresponding bandpass filter from the level setting device, and connecting the limiter, multiplier circuit, detector, and level judger, it is the same as above except that the frequency of the bandpass filter is different. Demodulated output can be obtained with this configuration.

By the way, when a current is passed through the loop shown in Figure 3, a magnetic field is created depending on the direction and strength of the flow, and the level changes depending on the location and direction of detection.

If we focus only on the vertical magnetic field, there will be level changes between the inside and outside of the loop due to the influence of surrounding loops, but if we focus only on the phase, there will be no in-phase or anti-phase, and there will be a narrow gap on or near the loop. Within this range, the magnetic field is zero, and outside the loop it is in reverse phase.

From the above principle, it can be seen that if the induction loop of FIG. 3 or the induction loop of FIG. 4 is constructed based on the encoding of FIG. 2, a large number of position signals can be easily constructed.

If 16 division units are one loop and n loops are configured for n digits, 16n divisions are possible.

On the other hand, when receiving, as shown in FIG. 3, the position of the induction loop and the receiving antenna AI, A2°A4. A8
．． The level determiner DI shows the phase relationship between the received level of the vertical magnetic field and the position of the AO as shown in FIG.

D2. D4. r regardless of the size of the level from the DB
It is output as the relationship ob, rt, l.

In addition, when explaining the above embodiment, explanation was given to a position detection device for detecting a moving object in which an inductive radio transmitter is arranged on the ground side and an inductive radio receiver is arranged on the moving object side. Terrestrial reception can also be performed in the same way by connecting guided radio transmitters with different frequencies to each loop antenna, and demodulating the different frequencies using the same guided loop as above.

[Effects of the Invention] As described above, this invention focuses on the fact that the phase of the vertical magnetic field is reversed inside and outside the induction loop, and uses the inside of the induction loop to assign the code of the position signal, thereby creating a one-induction loop. Since a plurality of bits are allocated in parallel along the travel route and a reference signal loop is also added, there is an advantage that the n-th power of point divisions can be easily realized as absolute positions with high accuracy.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a parallel 2m type induction loop applied to a conventional moving object position detection device, and Fig. 2 is an example of alternating code applied to the moving object position detection device using guided radio according to the present invention. FIG. 3 is a diagram showing an example of the configuration of an induction loop applied to the moving body position detection device using guided radio according to the present invention, and FIG. FIG. 5 is a block diagram showing the configuration of a moving object position detection receiving device in the moving object position detecting device using guided radio according to the present invention. a, b - arrangement #jim, al-1 to a1-n
, m2 1~n2 m, bl-1~bln,
b2 1~b2-m, an-1, bn-1=・
Loop, RoyRn...Terminal resistor, L. ~Ln... Guided radio transmitter, AI, A2. A4. A8
゜AO...Antenna, C1, C2, C41C8, CO
... Approach cable, Fl, F2. F4. F8.
FO...Band pass filter, LA1, LA2
, LA4, LA8. LAO...Limiter, K 1 t K 2 * K
4tK8...detector, DI, D2. D4.
DB...Level judger. In addition, the same symbols in the figures indicate the same or corresponding parts.

Claims (2)

[Claims] (1) Divide the required area along the road on which the moving object travels into multiple sections, and each section has a multi-bit address of "1" or "0" corresponding to # order with sequential inscriptions. code, add the reference signal and the code to be given to the code of multiple bits in the entire interval, and add “0” of this code bit string.
” and “1” so as not to intersect even once on the plane to form a first induction loop, and a 2
An induction loop is arranged, one wave signal is transmitted from a guidance radio transmitter on the ground side to the first induction loop, and the reference signal is given to the side corresponding to "1" of the first induction loop. An induced magnetic field of the same phase as the "1" side of the second induction loop is generated, and an induced magnetic field of the opposite phase is generated on the "Oj" side of the first induction loop, and on the moving body side or the ground side. A moving object position detecting device using guided radio, characterized in that it receives a transmission signal of a first guided loop and demodulates a code corresponding to the plural-bit position signal. (2) The required area along the route on which the moving object travels is divided into multiple sections, and each section is divided so that it is expressed as a power of multiple bits of "1" or "0". The signal line for the guided radio should be constructed so that it does not cross the boundaries of rOJ and rlJ in the area corresponding to each digit, even once on the plane. A second induction loop is arranged to provide a reference signal corresponding to the first induction loop, and a ground side or A mobile body position detection device using guided radio, characterized in that n different waves of position signals are transmitted from a guided radio transmitter on the mobile body side, and the signals are received on the ground side or on the mobile body side and the position signals are demodulated.