JPS5941616B2 - Information transmission device to a moving object at a fixed point - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a mobile device capable of transmitting a plurality of pieces of information for each specific point on a running route between a moving object such as a train moving on a fixed running route and ground fixed equipment (hereinafter referred to as a ground station). This relates to a body information signal transmission device, in particular, a device that transmits multiple information by configuring a multi-frequency simultaneous oscillation circuit through the same coupling device and combining multiple frequencies, and the information response side is configured with a resonant circuit and does not require a power source. It is characterized by its good qualities.

BACKGROUND ART Conventionally, in order for a train or the like to receive information from a ground station at a fixed point, an information transmission device, for example, the circuit configuration of which is shown in FIG. 1, is used.

In Fig. 1, the area below the two-dot chain line is equipment on the information detection side, for example, on the moving body side, and is connected to the amplifier 1 and its input and output sides, respectively, and loop coils 3 and 4 (L
p and Ls) form a feedback oscillator, 2 is an oscillation frequency selection circuit, and 5-1, 5-2, . . . 5 forming this circuit
-n is a predetermined frequency fl, f2,...
Bandpass filter (BPF) to extract each fn
, 6-1, 6-2, ... 6-n are amplifiers, T-1, 7
-2,...T-n is a signal detector (DET), 8-1,
8-2, . . . 8-n is a Schmitt trigger (ST) circuit. Coupling loss or feedback factor (β) of loop coils 3 and 4, gain of amplifier 1 (μ), input and output phase difference (φ)
In this case, the oscillator composed of this feedback circuit is connected to the loop coil 3.
If no other tuning circuit is coupled to 4 and 4, it oscillates at a specific frequency f4 (the inductance L of the loop coil 4 and the tuning capacitance Cl constitute a circuit that resonates with fl), and the information response side When the tuned loop coil (L) 9 approaches the loops 3 and 4, the tuned frequency of the loop coil 9 (fl, f2, ... fn according to the above arrangement)
The oscillation frequency is selected so as to shift to the oscillation frequency determined by the first wave in the range. At this time, the coupling loss β3 between loop coils 3 and 4
, 4 is coupled with the loop coil 9, the coupling loss β3,
, 4, β3,4>β3,9,4 holds true. First, the oscillation frequency when no other tuned loop coil 9 approaches is f1 as described above, and BPF5-1, 6
The F wave is detected by the -1, 7-1, and 8-1 series selection circuit. Detection of the f1 wave would represent no information. Next, the area above the two-dot chain line in FIG.
and a capacitor 10 with a capacitance C, and by switching the capacitor C, the tuning frequency is sequentially changed to a specific frequency, for example, one of F2, f3, . . . Fn, according to the information. be able to. Utilizing this fact, as the moving object moves, the loop coil 3 on the moving object side
and 4 are closely coupled to the loop coil 9 of the ground station installed along the running route, the oscillation frequency changes to which value among F2 to Fn depending on the tuning frequency of the loop coil 9. The oscillation frequency selection circuit 2 detects the oscillation frequency, and the mobile object can know the information content determined in advance based on the oscillation frequency. However, such an information transmission device can detect only one piece of information determined at one point, and the frequency band in which the change in phase (φ) between the loop coils 3-9-4 is almost zero. Since the frequency range is narrow, the practical frequencies of F and -Fn are limited to about 10 waves at most, making it difficult to transmit multiple items of information at one point. On the other hand, when transmitting information for automatic travel control or group management of mobile bodies, the amount of information between the mobile body and the ground station increases, and in order to transmit economically, it is necessary to transmit multiple items at one point and with one coupling device. Information transmission is required, but it has been difficult to satisfy both with conventional devices. The present invention was carried out with the aim of eliminating the above-mentioned drawbacks, and it is possible to transmit multi-item information while sharing one coupling device at one point, and it is possible to transmit multiple items of information at one point, and to enable automatic travel control of vehicles, cranes, etc. A remarkable effect is obtained in that the transmission of command information and the collection of mobile object information for group management of mobile objects can be carried out economically.

The present invention will be specifically explained below. FIG. 2 is a diagram showing an example of the circuit configuration of the device of the present invention. The area above the two-dot chain line in the figure is the information sending (hereinafter referred to as response) side, and the area below is the information detection side, and symbols 3, 4, 5, 7, 8, and 9 are the same as in FIG. 11
is a linear amplifier, 12 is a synthesis circuit, 13 (13-1 to 13
-n) is a phase shifter (phase shifter PS), 14 is a variable attenuator (ATT), and 15 (15-1 to 15-n) is an amplifier (A
), 16 is a bias voltage generation circuit, 17 (17-2 to 1
7-n) are response frequency setting switches (SW2 to S
Wn), 18 (18-2 to 18-n) are series resonant circuits with preset frequencies, specifically frequency selection with high Q of ceramic resonators or electromechanical resonators (electromechanical filters). A high impedance is used for frequencies other than the resonant frequency.

Next, Figure 3 shows 3, 4, 5, 13, 14 on the detection side in Figure 2.
This is an example diagram of a loop circuit composed of 15, 12, and 11.
a is the configuration of the oscillation circuit when there is no coupling between the response side and the detection side, and b is the configuration of the oscillation circuit when the response side and the detection side are coupled, for example, the frequency F
2 shows the configuration of the oscillation circuit when performing the second oscillation.

If there is no coupling between the response side and the detection side, the coupling between loop coils 3 and 4 is small for frequencies F2 to Fn in the circuit configuration shown in Figure 3a (the coupling between loop coils 3 and 4 is minimal). (assuming that there is a relative position such that the coupling is at least sparse), the feedback factor β is small, μβ is 1 (μ is the effective amplification of the loop circuit), and the phase angle of the feedback voltage is φVOO, so oscillation is avoided. Set it to . However, in this case, in the circuit configuration shown in FIG.
Tl4 is in the minimum loss state, μ is μm, β is β1, satisfying μ, β1>1, and if the phase shifter 13-1 is set to be φ-00 with respect to the frequency F, this loop can be completed. The circuit can maintain stable oscillation at frequency F. Next, on the response side, for example, switch 17-2 is closed, loop coil 9 becomes a mere coupling coil, and loop coil 9 is coupled to loop coils 3 and 4 on the detection side while the entire response side circuit resonates in series at frequency F2. As a result, the oscillation circuit shown in FIG. 3b is constructed.

Since the linear amplifier 11 amplifies both the f1 wave and the F2 wave at the same time, when the loop coils 3 and 4 and the loop coil 9 are coupled, the F2 wave oscillates, but μmβ1 × μ2β2 (μ2, β2
The coupling M between the loop coils 3, 4, and 9 and μ2, β2, μm, β, are set to satisfy the frequency F, μ, β), and the bias generation circuit 16 uses the F2 wave oscillation output. Then, a bias level for driving the variable attenuator 14 is output to increase the amount of attenuation of the attenuator 14.
Since the control is performed as follows, the oscillation of the F wave stops and only the F2 wave oscillates. Similarly, the responding side receives F3, f4,...
・Switches 17-3, 17-4, so as to resonate with Fn
. . . If one of 17-n is closed and the loop coil 9 is brought close to the detection side loop coil, the circuit shown in FIG. 3b is constructed for each frequency, and each phase shifter PS (13-2 to 13- n)
phase adjustment is performed for each frequency, μβ〉1 and φ=O are satisfied, F3,...FO oscillate, respectively, and if multiple switches 17-2 to 17-n are closed, F2, f3 , . . . Simultaneous oscillation of multiple frequencies in Fn can be obtained.

Figure 4 shows the relationship between the relative distance of the loop coils on the response side and detection side of these oscillations, the oscillation frequency, and the oscillation voltage e, and C in the figure is the position where loop 9 is in the center of loops 3 and 4. In this case, the oscillation output e of multiple frequencies in F2 to Fn corresponding to the closed switches of 17-2 to 17-n is obtained, and if there is a large deviation from C to the left or right, μβ〉1 cannot be satisfied. When the loop coils on the response side and the detection side are not tightly coupled, the oscillation of F2 to Fn stops, and the oscillation of the f1 wave starts, and the detection side always oscillates the f1 wave when the loop coils on the response side and the detection side are not tightly coupled. . Note that μmβ,〈μmβm(m-2,3,・
...n), so the oscillation outputs of F, and F2 to Fn are the same as f1 and F at the switching part as shown in Figure 4.
2 to Fn are duplicated. The greater the linearity of the linear amplifier 11, the smaller the difference between the output during multi-wave oscillation and the output during single-frequency oscillation. And f1~F as above
The oscillation output of each frequency of n is detected by a detection circuit for each frequency consisting of a signal detector 7 (7-1 to 71n) and a Schmitt trigger circuit 8 (8-1 to 8-n) and converted into a rectangular wave. It is formatted and output. That is, if the oscillation frequency is F, then Il,f
2, I2, . . . , Fn provides a detection output current based on a binary code, such as In. The apparatus of FIG. 2 is then used in the following manner for information transmission.

First, in a state where the sensing side and the responding side are not coupled, the f1 wave oscillates, and it is detected that there is no information outside the fixed point where information is transmitted. At a fixed point, F
, detects the position of a moving object by stopping the waves, and detects information transmission by multi-frequency oscillation. This information form, for example, involves assigning a frequency from F2 to Fn to each bit of the numbers 0 to 9 represented by a 20ut0f5 code or a 4-bit digital code, detecting the oscillation output of these frequencies, and detecting each of the codes. It is possible to configure "1" and "0" of bits. To give a concrete example of this, for example, a 5-digit number (00
000~99999) 5 waves assigned to each digit, 20ut
If the 0f5 code (5-bit configuration) is used, the number of frequencies used will be 25 waves, but as is well known, the 20ut0f5 code represents the numbers 0 to 9 with 5 bits, and each code always includes the "1" bit. Since there are two, it is sufficient to allocate two waves per digit for this five-digit information, and it is necessary to simultaneously oscillate ten waves for five digits. In Figure 2, it is n-26, which requires 25-wave detection side frequency oscillation and the installation of a detection circuit.
It can be seen that 10 of these waves oscillate simultaneously and five types of information are simultaneously transmitted as, for example, a 5-digit digital code, and that an oscillation detection circuit for one wave f1 is required, which would detect no information. Note that the binary codes such as i1 to In are led to a decoder and converted into, for example, analog information or digital information for use, but since these techniques are well known, their explanation will be omitted. Also, the series resonant circuit 18- on the response side
As mentioned above, if an electromechanical resonator with a high Q is used, it is possible to arrange adjacent frequencies to 2 to 18-n, and the phase shifter 13 can perform phase correction to satisfy the oscillation conditions. For example, 5
It is possible to allocate frequencies of 30 to 50 waves within the double ratio band (within one octave) of the 0 kHz to 450 kHz band.

Furthermore, the amplification μ required by each detection side loop circuit in FIG. 2 is obtained by amplifiers 15 and 11, but the common minimum amplification required for oscillation is shared by the common linear amplifier 11, so
There is no need to increase the gain of the amplifier 15 of each loop circuit, and the circuit configuration becomes simple. As is clear from the above description, in the present invention, the response side is powered off except for the information source that supplies current such as opening and closing the switch 17, and when the detection side loop coil is closely coupled to the response side loop coil. Simultaneous oscillation of multiple frequencies is performed, and this allows multiple types of information to be transmitted at one point and one coupling device (i.e., responding device), making it possible to transmit information between the mobile unit and the ground station. It can be said that it is an inexpensive and highly reliable device.

In particular, only one pair of coupling loops is required for both the response and detection sides, making the device compact and lightweight.The response-side resonator is also equipped with an electromechanical oscillator (filter), which is small, lightweight, generally inexpensive, and has high frequency stability. It is highly reliable because it is used, and it is used in automatic running control and group management of trains, cranes, vehicles, etc.
It has a wide range of applications, such as detecting the position of a moving object by blocking the signal, simultaneously collecting information such as vehicle type, operation division, and vehicle monitor, and simultaneously transmitting control commands. Furthermore, since narrow band signal detection is used even in noisy areas, the influence is small and reliability is high; fail-safe measures are easy, for example, by constant detection of F1 waves and selection of information codes; The practical effects of the present invention are remarkable, as ground equipment is inexpensive because it is a response detection method.

[Brief Description of the Drawings] Fig. 1 is a block diagram of an example of the circuit configuration of a conventional device, Fig. 2 is a block diagram of an example of the circuit configuration of the device of the present invention, and Fig. 3 is a block diagram of an example of the circuit configuration of the device of the present invention.
The diagram shows an example of the configuration of the loop circuit, and FIG. 4 is a diagram showing an example of the characteristics of the loop coil spacing and the loop circuit oscillation voltage in FIG. 2. 1, 11... Linear amplifier, 2... Oscillation frequency selection circuit, 3, 4, 9... Loop coil (coupling device), 5 (5-1 to 5- n)...BP
F, 7 (7-1 to 7-1n)...Signal detector, 8
(8-1 to 8-n)... Schmitt trigger circuit, 12... Synthesis circuit, 13 (13-1 to 13
-n)... Phase shifter, 14... Variable attenuator, 15 (15-1 to 15-n)... Amplifier, 16... Bias voltage Generation circuit, 17 (1
7-2 to 17-n)...Response frequency setting switch, 18 (18-2 to 18-n)...Series resonant circuit with specified frequency.

Claims (1)

[Claims] 1. As each multiple information transmission device at an arbitrary number of fixed points between a mobile object moving on a fixed travel route and a ground fixed station, one piece is connected to the first loop coil and both ends thereof, and each transmits in series with a disconnection switch. a response side device consisting of a plurality of high Q resonators each resonating at a different constant frequency assigned to the desired information, and a response side device that is tightly coupled to the first loop coil when the moving object approaches an arbitrary fixed point, and the moving object a set of two second loop coils that are loosely coupled when is outside the fixed point, and a bandpass filter that extracts each resonance frequency generated in the responding device only when the moving body approaches the fixed point; A plurality of frequency selective amplification circuits comprising a phase shifter and an amplifier, a linear amplifier that synthesizes and amplifies their respective outputs, and a frequency other than the above-mentioned resonator assigned frequency when the moving object is outside the fixed point together with the second loop coil and the linear amplifier. A filter for extracting frequency f_1, a phase shifter, a variable attenuator, and an amplifier that constitute a loop oscillation circuit that oscillates at a constant frequency f_1 of A fixed point characterized by comprising a detection side device comprising a selective amplification circuit for frequency f_1 including a circuit, and a detection output circuit that detects and shapes the outputs of the selective amplification circuits for each frequency and generates a rectangular wave output. An information transmission device for mobile objects.