JPH0249671B2 - IDOTAIICHIKENSHUTSUHOSHIKI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a mobile body position detection method that detects the absolute address of a mobile body using a guided radio line.

Various methods have been proposed for detecting the position of a moving object by installing intersecting guided radio lines along the travel path of the moving object and guiding signals between the moving object and the guided radio line. Fig. 1 shows a method for detecting the position of a moving object on the ground, in which a signal transmitted from a signal generator 21 mounted on the moving object is transmitted via a transmitting antenna 22 for position detection to an n-pair antenna installed on the ground side. is guided to the guided radio line 12. The signals thus induced are guided for each pair to a signal processing device 24 which converts the signal phase from a phase reference pair, e.g. The position of the moving object is detected by comparing the phase of the signal from the paired line and performing binary encoding. On the other hand, in this method, if multiple bits of binary digits that make up an address change at the same time between adjacent addresses, a detection error will occur at the address boundary, so only one digit of the binary digit of the adjacent address will change. It has been proposed to cross guided radio lines so that
-70332 (see Japanese Patent Application Laid-open No. 187878/1983). Although this method does not cause detection errors when changing addresses, it is preferable that the phase reference pair is also crossed in order to improve resistance to crosstalk between pairs, variations in phase constants, and noise. However, in this method, when the transmitting antenna is located on the intersection of the phase reference intersection and the track, the signal that serves as the reference for phase comparison is not input, so the position of the moving object cannot be detected when it is on this intersection. There is.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for detecting the position of a moving object that can detect the position of the moving object even when the antenna for detecting the position of the moving object is located on the intersection of a pair of phase reference crossing lines. be.

Describing the system of the present invention with reference to the drawings, the second
The figure shows a specific example of detecting the position of a moving body using a guided radio line 12 consisting of 10 pairs of intersecting pairs of lines 1 to 10. In this specific example as well, as shown in FIG.
receives and processes these signals pair by pair. Although only a portion of the crossed pair lines 1 to 10 is shown,
Among these lines, the first pair of crossed pair lines 1 is used as a phase reference, and the second and subsequent pairs are used as address configurations 2 ⁰ ,
2 ¹ , 2 ² −−−−2 ⁸ bits are supported.

When the reference signal phase from the phase reference cross-pair line 1 and the signal phase from the cross-pair lines 2 to 10 for address configuration are in phase, it is set as a binary digit "0", and when they are in reverse phase, it is set as "1". , when the transmitting antenna 22 is on the 1st ground, the signal phase from the phase reference cross-pair line 1 is the same as that of all other address configuration cross-pair lines 2 to 1.
Since it is in phase with the signal phase from 0, it becomes the binary digit "0, 0, 0, 0, 0, 0, 0, 0, 0",
This becomes the decimal digit “0”. The transmitting antenna 22 is 2
When it is on the address, the signal phase from the ²⁴ bits, that is, the sixth pair of crossed pair lines 6, is opposite to the reference signal phase, so the binary digits "0, 0, 0, 0, 1, 0, 0,
0,0" becomes "16" in decimal digits. In this way, the signal processing device 24 can obtain the decimal digits shown in signal processing result (A) in FIG. 2 for each address.
Incidentally, in reality, these numbers are converted by a conversion device to obtain continuous values starting from address 1. On the other hand, when the transmitting antenna 22 is located at the boundary between addresses 1 and 2, that is, at the intersection of the sixth pair of lines 6, the signal processing device 24 cannot obtain a signal from the line 6, but between the adjacent addresses Since only one digit of the base number changes, the signal phase from the sixth pair of lines is forcibly recognized as "0" or "1" to detect the position of the moving object. That is, if the ²⁴ bit is set to 0, it is detected as the 1st address, and if it is set to 1, it is detected as the 2nd address, so it is possible to continuously detect the absolute addresses of the moving object.

On the other hand, when the transmitting antenna 22 is located at the intersection of the phase reference crossing pair line 1, that is, at the boundary between addresses 16 and 17 in FIG. 2, the signal processing device 24 cannot receive the reference signal. For example, the first pair is switched to the second pair of crossed pair lines 2, and the first pair of crossed pair lines is determined as ²⁰ bits. In this way, the first pair of crossed pair lines 1
If you force the signal phase from the second pair of temporary phase reference cross-pair lines 2 to be in phase with the signal phase and set it to "0", you will get a decimal number "382", so convert this value into the conversion table. The boundary between addresses 16 and 17 is output as address 16. In the example, the second pair of tracks 2 was used as the reference pair, but the third to
Any of the 10 pairs may be used as the reference pair. In this case, of course, it is necessary to change the values in the conversion table.

According to the present invention, as described above, an address can be detected without error even when a moving object passes not only an intersection of an address configuration cross pair line of a guided radio line but also an intersection of a phase reference cross pair line. Therefore, the position of the moving body can be reliably detected without inter-pair crosstalk and the influence of noise.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a moving object position detection method, and FIG. 2 is an explanatory diagram showing an example of the present invention. DESCRIPTION OF SYMBOLS 1... Phase reference crossing pair line, 2 to 10... Address configuration crossing pair line, 12... Guidance radio line, 2
2...Transmission antenna, 24...Signal processing device.

Claims (1)

[Claims] 1. A signal is guided between an antenna for detecting the position of a mobile object and a guided radio line consisting of multiple pairs of crossed pair lines for address configuration and a phase reference crossed pair line, and the signal phase from the crossed pair lines for address configuration is The position of the mobile object is detected by comparing the signal phase from the phase reference crossing pair line, and the guided radio lines are crossed so that only one digit of the binary digit of the adjacent address changes. In a certain mobile object position detection method, when the position detection antenna is located on the intersection of the phase reference crossing pair lines, one of the crossing pair lines for address configuration
1. A moving object position detection method, characterized in that a position on the intersection is detected by switching a pair of signals for use as a phase reference.