JPS6055004B2 - Orbit error calculation device - Google Patents

Description

[Detailed description of the invention] This invention calculates and processes measurement data of track deviation or height deviation obtained by a track inspection vehicle.
This is an orbit deviation calculation device that outputs data indicating the true trajectory curve shape.

Various types of track deviations are measured by track inspection vehicles on railway tracks, and the definitions and methods of measuring these deviations and height deviations, which are the subject of this invention, will be explained.

Misalignment refers to the bending of the rail in the longitudinal direction of the rail on the track plane.
For example, when a measuring string (hereinafter simply referred to as a string) is strung to connect a length of 10 m, it is defined as the distance between the string and the rail at the center point of the string. Figure 1 shows the amount of misalignment in the straight section of the rail (hereinafter simply referred to as misalignment).
In this figure, 1 indicates the left or right rail, 1a indicates the misaligned part of the rail 1, and 2 indicates the string. In the figure, the length of the string 2 is l, and the distance Y between the string 2 and the misalignment portion 1a at the center point of the string 2 is the misalignment. Figures 2A and 2b show a mechanism for measuring deviations in a track inspection vehicle (hereinafter simply referred to as an inspection vehicle); in Figure 2a, 3 is the car body, 4 is a trolley, and 5 is a measuring wheel. Three measuring wheels 5a, 5b
and 5c are provided at a distance of 1/2 from each other, and the front wheel 5a and the rear wheel 5c constitute a chord length 1.

The surrounding mechanism of each measuring wheel 5a, 5b and 5c is, for example, a trolley, as shown in FIG. 2b. The rotating shaft 6 of the measuring wheel 5 is rotatably supported by bearings 4a and 4b fixed to the bearings 4, and the rotating shaft 6 receives a force in the direction shown by arrow A from an air cylinder 8 via a connecting rod 7. is given, indicating the action of pressing the surface of the measuring wheel 5 against the head side surface 1'' of the rail 1. However, due to the internal mechanism (not shown) of the bearing 4b, the rotation of the rotating shaft 6 is limited to the connecting rod 7. is not transmitted. When the rail 1 has a bend or deviation in the horizontal direction on the track plane, the rotating shaft 6 moves in the axial direction according to the deviation position. 1
0, an angular electrical converter (hereinafter simply referred to as a converter) 1
Since the angle change is given to the central axis 13a of the converter 13
Thus, an electric signal corresponding to the eccentric position of the rail 1 can be obtained.
Since the converter 13 is attached to the bearing 12 fixed to the vehicle body 3 using the mounting shaft 13b, the above electric signal corresponds to the eccentric position of the rail 1 with respect to the vehicle body 3. Incidentally, unnecessary movement displacement of the cart 4 including vertical and directional movement is absorbed by the uniball joint 11 used at the joint between the arms 9 and 10 and the rotation function of the mounting shaft 13b of the transducer 13, and is absorbed by the central shaft 13a of the transducer 13. , only the axial motion of the rotating shaft 6 is input. The deviation detection mechanism including the measuring wheels 5 described above is provided at three locations on the vehicle body 3 as explained in FIG. Detect.

Now, if the direction of the rail 1 is taken as the x-axis, and the offset positions of the rail 1 obtained by the measuring wheels 5a, 5'b, and 5c at any x point are Yl, y2, and Y3, respectively,
The misalignment amount Y at that point is given by the following equation. Next, regarding height deviation, the circumstances are exactly the same as described above, and as shown in Figure 1, the deviation is on the orbit plane, but this can be viewed as a vertical section. You can change the pitch to the pitch shift.

In measuring the height deviation, the trolley 4 is used instead of the measuring wheel 5.
A method is used in which the vertical movement of an axle box (not shown) of a traveling wheel installed in a vehicle is transmitted to a converter using an appropriate arm. 4, and using the three pieces of vertical deviation data obtained by each converter, the height deviation is determined by the above equation (1). As mentioned above, the method for measuring deviation and pitch deviation is to measure at three points, the ends and the center point of the string to be measured, but the method for measuring pitch deviation is based on a different principle, that is, using a gyro and measuring the level line. There is a method of creating a height line and determining the difference in height between the front wheels and the rear wheels with respect to this level line.In order to distinguish between these, the method that is the subject of this invention will be referred to as the three-point measurement method.

Recently, an optical deviation detection mechanism has been developed in place of the mechanical deviation detection mechanism explained in Fig. 2b, but no matter what detection mechanism is used, the principle of the misalignment measurement method based on the three-point measurement method still applies. There is no difference in what has been described above. Now, the three-point measurement method described above has been established for a long time and is widely used in practice, but when examined in detail, it is found that the waveform of the measurement data contains ghost waveforms that are harmful and useless, accompanying the correct measurement waveform. There is a problem of appearing.

The reason why such waveforms appear is that the three-point measurement method does not measure the shape of the curve itself, but simply measures the three-point measurement method.
This is because it measures the relative deviation of a curve between points. The process by which such harmful and useless waveforms are generated will be explained using diagrams.

FIG. 3a shows a case where the length of the deviation part A (hereinafter referred to as waveform) λ is smaller than one-half of the chord length 1, and the inspection vehicle is assumed to move in the direction of arrow B. First, when the front wheel 5a passes through the misaligned part A, the front wheel 5a moves upward, so depending on the relative positional relationship of the three wheels shown on the right side of the figure, there is a negative sign (when the center wheel is at the bottom, there is a negative sign). ) deviation amount Y1
is calculated and output. Next, the center wheel 5b detects the deviation part A and outputs the deviation amount Y2, and further outputs the deviation amount Y3 with a negative sign. That is, as shown in Fig. 3b, the measured data Y of the amount of deviation is simply three waveforms Yl, Y2, and Y3 for one deviation part A, and the central waveform Y2 is correct, but there are differences between the front and back. The resulting negative waveform Yl, Y
3 are all ghost waveforms that are harmful and useless. Even when the wavelength λ of the deviation part is larger than l/2, a ghost waveform appears in the same way as above, and in that case, parts of the three waveforms overlap each other, so the tail part of the correct waveform in the center is distorted. As the wavelength λ becomes longer, the peak value of the central waveform decreases, and the waveform deforms into a completely different shape.

In Fig. 4 A, b, and C, 1/2, 11, and 1.51 are respectively taken as the wavelength λ of the deviation part for a constant chord length 1, and the curve f(x) of the deviation part is a cosine wave (1 -COJ engineering x)/2 and λ,
The amount of deviation Y is obtained by calculation, and it is thought that these figures will help you better understand the ghost waveform and its error influence on the measurement data in the three-point measurement method described above.

When measuring the amount of deviation using conventional track inspection vehicles, the ghost waveform that appears in the three-point measurement method described above is known empirically, and with that experience and skill, the measurement data on the recording chart can be deciphered. A method was used to determine and evaluate the correct amount of deviation.

However, this method is prone to errors, has limited accuracy, and requires special experts, so it is desirable to have a system that outputs and records the trajectory curve itself with high accuracy without ghosting. It was rare. This invention eliminates the drawbacks of the measurement data obtained by the three-point measurement method described above, and calculates the conventional deviation and height deviation data to produce a trajectory curve shape that indicates the correct trajectory deviation. The purpose is to provide a computing device.

The first point of this invention is to implement the principle and calculation circuit for calculating the correct trajectory curve by performing the necessary calculations using the measurement data Y by the three-point measurement method described above, which will be explained below. .

As described above, the three-point measurement data Y is, in principle, a special difference value of the trajectory curve (hereinafter referred to as the original curve).

In other words, it is a chord that connects the two end points of three points placed at regular intervals of 1/2, and in this case, it is the deviation value, or difference, of the midpoint with respect to the reference line, and the problem is to find the original curve from this difference. be. In FIG. 5, for convenience, the direction of the vehicle body is assumed to be the x-axis, the direction perpendicular to this is assumed to be the y-axis, and the original curve in this coordinate system is assumed to be y=f(x).

Here, if x is the position of the front wheel, the positions of the center wheel and rear wheel are expressed as x-1/2 and x-1, respectively, and the values of f(x) at these three points are f
(x), f (x above/2) and f (x - 1). Also, considering that the three-point measurement value is a differential value, it is expressed as ΔY instead of Y. The amount of deviation measured when the front wheel is now at x is the data at the center wheel position, so if we write this as ΔY (x up/2), it will be expressed as shown in Figure 5 and above (1).
), the following equation holds true. It can be grown.

Equation (3) means that the value of the original curve f(x) at point value f
This shows that a composite calculation can be performed from the values of (x-1/2) and f(x-1). That is, the original curve y=f(x)
To find out the value at point x, if the original curve f(
If the value of x) is already obtained, it can be determined from these and the measured value ΔY(x-1/2) at point x. Also, suppose that f(x
) is obtained, then f(
x) should be able to be found. Now, when executing equation (3), it is assumed that the backward data has already been obtained, but in this invention, a known value is input as the initial value at the time of starting measurement, etc. Once the measurement has started, the value of f(x) is delayed by the distance of chord length 1 and its 112 using an appropriate delay circuit, and the successively obtained measured value ΔY is multiplied by the necessary coefficient. In this method, the values of the original curve f(x) ahead are continuously determined by performing addition and subtraction operations.

From the above, it is theoretically clear that by giving the initial value of the original curve f(x) and calculating the amount of deviation ΔY, the original curve f(x) can be obtained regardless of the shape or wavelength. However, this is shown diagrammatically.

The original curve f(x) is a cosine wave (1-C
Os7lx)/2, and the right side of equation (3) is x
When calculating τ, the waveform shown in FIG. 6 is obtained.

The upper part of the figure is for -2ΔY(x-1/2), the term on the right side. In the middle row, the first term 2f(x-1/2) and the second term -f(x-1) are drawn consecutively. For these, the original curve f (x) is the lower waveform, but the equation (
If 3) is calculated strictly for x, of course, in the case of the figure, it is easy to see by visual inspection that f(x) in the lower row can be obtained by adding the waveforms in the upper and middle rows. Therefore, it can be proven that f(x) can be obtained from equation (3).It goes without saying that equation (3) can be applied to any curve and is correct regardless of this example. Regarding the delay circuit, since the traveling speed of the inspection vehicle is not necessarily constant, the delay time for the chord length 1 and its distance 112 cannot take a constant value.

For this reason, it is inappropriate to use a clock pulse with a normal time period as a shift pulse for use in a delay circuit. Therefore, in this invention, using distance proportional pulses (hereinafter simply referred to as distance pulses) that are generated every fixed distance traveled, continuous measurement data ΔY is sampled to create data at fixed distance intervals. It always provides accurate distance delay through the shifting shift register. Note that it is advantageous to perform these arithmetic operations using digital arithmetic operations in terms of accuracy. Next, let us discuss the sampling interval using the distance pulse described above.

It is desirable that this sampling interval be less than a fraction of the minimum wavelength of the deviation portion that requires measurement. This is because the sampling interval is the limit of resolution. Furthermore, it is absolutely necessary that the sampling interval be exactly an integer fraction of the chord length 1. The reason for this is that the calculation of equation (3) is performed at the position where the distance-delayed rear data exactly matches the new measurement data ΔY.
Otherwise, there is a risk of errors occurring. Conventionally, distance pulses with a length of 1rrL have been used in inspection vehicles, and since the chord length l is 10 m, they can be used as is. The second point of this invention relates to the setting of initial values. Let us consider again FIG. 5 and equations (2) and (3). As mentioned above, in FIG. 6, equations (2) and (3) are derived with the direction of the vehicle body taken as the x-axis for convenience. However, the direction of the vehicle body changes as the inspection vehicle moves, even on the track plane (in the case of misalignment).
It changes constantly even on the vertical section of the track (in the case of height deviation), and is not an unchanging or fixed coordinate system with respect to the original curve f(x). Therefore, let's consider a method that uses a level line obtained by a gyro or the like as a constant and unchanging standard. Figure 7 shows a case where the x'' axis is a level line that always maintains a constant direction, and the axis of the vehicle body has an angle of 0 to this axis.For convenience, the origins of the two coordinate systems are assumed to coincide. It is also assumed that the x-axis of the car body and the direction of chord 1 are the same.As shown in the figure, equations (2) and (3) hold as they are for the X and y-axes.
It is clear that the following equation, which has the same form as equations (2) and (3), holds true when the original curve is set as y″=F(X″) for the ″, y″ axes. Equations (2), (3) and (4), (5)
When comparing the formulas, the larger the angle 0 between the X, y axes and the X'', y'' axes, the greater the difference between l and 1'' and between ΔY and ΔY''. On the other hand, since the data obtained by measurement is ΔY regarding the X and y axes, ΔY″ is not measured (4), (5
) expression is not possible. This shows that it is inappropriate and inconvenient to use an absolute reference line such as a level line. Note that in FIG. 5, for convenience, the direction of the vehicle body is taken as the x-axis, but it is also understood that strictly speaking, it is accurate to take the direction of the string as the x-axis. As described above, as the coordinate system of the original curve in this invention, the direction of the measurement string is
There is no other way than depending on the coordinate system used as the axis. However, as already mentioned, the direction of the string constantly changes with the movement of the inspection vehicle and is not constant. This is where the issue of setting initial values becomes relevant. Now, at any point, set the initial values of f(x-1/2) and f(x-1) in equation (3) to values with the direction of the string at that point as the x-axis and start measurement. In this case, the original curve f(x) obtained at a point where the direction of the chord is different from the initial one due to the movement of the inspection vehicle is based on the coordinate system at the point where the above-mentioned initial values are set.

In this case, the error that occurs is the difference between equations (3) and (4), and depends on the formats of the functions f(x) and F(x″), but approximately speaking, l and 1″ and ΔY and ΔY This difference is expressed as a difference of 1-1 when the angle between the x-axis and
It is the ratio of 1/COSθ. For example, when θ=100, it is about 1.5%. If the direction of the vehicle body, and therefore the direction of the string, changes significantly due to the movement of the inspection vehicle, and the measurement error described above cannot be ignored, correct measurements can be made again by changing the coordinate system, that is, resetting the initial values. becomes possible.

I need to do this again. As a method of resetting the initial value, it is preferable to reset the initial value immediately after a point where the direction of the string changes significantly, at the entrance of a straight section, as shown at 1, 2, and 3 in FIG. Select an interval in which the simultaneously measured deviation amount ΔY is continuously below a certain small value, and in that interval, f(x-1/2) and f(x-1) in equation (3).
) may be set to zero or a predetermined value. In this invention, as a method for setting or resetting the above-mentioned initial value, a method is adopted in which a circuit for monitoring the measurement data ΔY is provided and a section in which ΔY is continuously below a small constant value is detected.

On the other hand, a planned section suitable for resetting the initial value is stored in an appropriate storage device in advance based on the shape of the track, and the initial value is automatically reset based on a match with the section detected by the above-mentioned monitoring circuit. The method is to carry out the following steps. FIG. 9 is a block diagram of the overall configuration of an embodiment of the track deviation calculation device according to the present invention, in which track deviation data Δ is obtained from a three-point measurement system (track deviation or height deviation) 15 provided on the inspection vehicle.
Y is applied to an analog-to-digital converter (hereinafter referred to as an A/D converter) 16. On the other hand, a distance-proportional sampling pulse SP is also generated in the sampling pulse generator 17 using the distance pulse DP prepared separately in the inspection vehicle.
The track deviation data ΔY is supplied to the converter 16, and is sampled and digitized at regular distance intervals to become the deviation amount [ΔY] (hereinafter 0 represents a digital amount), which is then used in the original curve calculation circuit of the next stage. At 18, the original curve [
y=f(x)] is obtained. Now, as stated earlier, the data of the original curve [y=f(x)] obtained by the above circuit shows the correct shape regardless of the length of the wavelength of the orbit deviation.

Therefore, curved or sloped parts existing on the trajectory were also included in the calculation results, but generally in curved or sloped parts, the original curve f(x ) is much larger than the amount of change in f(x
). For this reason, when recording the original curve [y = f (x)] of the above calculation result as it is (after converting it to an analog value, of course) on chart recording paper, the range of data change is wide, and the required amount of deviation is The accuracy of the curve cannot be obtained. Originally, the purpose of this orbital deviation measurement was not to capture the orbital curve macroscopically, but to capture the deviations that exist within a somewhat narrow range microscopically.
On the other hand, since the length of the curved part or slope part is usually much longer than the wavelength of the orbit deviation, the data of the original curve described above [
y=f(x)], it is desirable to remove longer wavelength components. The digital filter indicated by 19 in FIG. 9 is for the above purpose, and in this digital filter 19,
The average value M of the data of the original curve [y=f(x)] is determined by a weighted average method called moving average method for a certain length range, and the data of the original curve [y=f(x)] is This is achieved by subtracting the average value M from
No. 4577 Crocodile Composite Track Offset Arithmetic Processing Unit), the detailed explanation will be omitted as it is well known.

Next, the initial value setting circuit 22 will be described.

In the initial value setting circuit 22, the deviation amount ΔY is monitored according to the above-mentioned procedure, and a section in which the deviation amount ΔY is continuously below a certain value is detected, and the distance of the predetermined setting section is memorized. , select a scheduled section using the distance reading method, determine that the two sections match, set a new initial value for the original curve calculation circuit 18 in that section, and immediately after this setting is completed, the calculation circuit The operation will be restored to normal. FIG. 10 is a somewhat detailed block diagram of the original curve calculation circuit 18 and initial value setting circuit 22 in FIG. 9.

The above-mentioned digitized deviation amount [ΔY] is converted into a value of [−2ΔY] by the double value/sign inverting circuit 23, and then sent to the adder 24.
Enter. The output of the adder 24 is the value of the original curve [y=f(x)] which has already been calculated as will be described later.
A delay loop circuit is constructed in which this data is branched, passed through a delay circuit, and inputted again to the adder 24. That is, the data of the original curve [y=f(x)) is first delayed by 1/2 TrL in the pre-shift register 25a, for example by 5WL if chord length 1 is 10TrL. Now, when the distance of the sampling pulse SP is 1 m, the pre-shift register 25a has a five-stage structure, and is shifted by one stage for each sampling pulse SP, so that the traveling distance is 5TrL.
, the resulting data is delayed by 57n at [f(
x-1/2)]. This data is double value circuit 2
6, the double value [2f(x-1/2)] is calculated and added to the adder 24 via the normal contact of the switch 28a. Output data of the pre-shift register 25a [f(x-
The data [f(
x-1)], and the sign inversion circuit 27 inverts it as [-
f(x-1)] and is added to the adder 24 through the normal contact of the switch 28b. As already explained, the three data [-2ΔY], [2f(x-1/2)] and [-
It goes without saying that the original curve [Y=f(x)] is obtained by summing the Y=f(x-1)] as shown in equation (3), and is output to the output side of the adder 24.

Next, circuit operations for setting and resetting initial values (hereinafter simply referred to as setting because there is no essential difference between them) will be described. First, the deviation amount ΔY is monitored by the analog sample and hold circuit 29, the analog comparator 30, and the "゜1σ゛" pulse counter 31. Three-point measurement system 1
The deviation amount ΔY of the analog quantity from No.
When the reference value is not exceeded, one judgment pulse is output for each sampling pulse.

The 461σ pulse counter 31 has a function of outputting an 0N signal only when one judgment pulse is input in succession, and as a result, a section in which the deviation amount ΔY is continuously extremely small is detected. The ON signal is output when the front wheel is at the leading end of the section (the end in the traveling direction).

On the other hand, the distance for the scheduled section whose initial value is set in advance according to the track shape etc. is stored in the scheduled section storage circuit 33,
The travel distance is created by the travel distance integrator 32, and this is supplied to the memory circuit 33, and when the inspection vehicle is in the scheduled section where the initial value is set, an appropriate signal is output, which matches the above ON signal. At this time, the switches 28a and 28b are switched through the gates of the AND circuits 34, 35 and 36.

The initial value for the relevant section, which is given in advance to the initial value storage circuit 39 by the operating contacts of the switches 28a and 28b, is input to the adder 24 instead of the data delayed by the shift registers 25a and 25b, and the initial value is Settings are to be made. In this case, it should be noted that when setting the initial value, [f(x-1)] and l/2
It is necessary to update [f(x-1/2)] for Tr1, that is, all data stored in both shift registers 25a and 25b. However, updating all of these data at once requires a complicated circuit configuration, so in this embodiment, the sampling pulse SP is
Each time, the address of one stage of each shift register 25a, 25b is changed at the input stage of the adder 24, and the old data is discarded. The initial values above are I for IWL delay and 1/2W1. 1/2 for the delay.

As mentioned above, both of these settings start at the same time, but the end time of the settings is different for both, and it is l/
The 27TL delay ends early. Since it is necessary for the circuit to return to normal operation immediately after each setting is completed, a 66F3 pulse detector 37 and a ゜"1/2゛ pulse detector 38 are provided for this timing.
1 and l/2 sampling pulses SP respectively
After detecting, a signal is immediately output and the AND circuit 35,3
6, the switches 28a and 28b are restored. Each of the circuit elements used in the embodiment shown in FIG. 10 described above can be designed and manufactured using ordinary circuit technology, and the overall configuration of the embodiment can be easily realized.

Although the details of the above embodiment may be modified,
As long as the original curve is obtained by calculating and processing the deviation amount data from the three-point measurement system, it is included in the present invention. As described above, according to the track deviation calculation device according to the present invention, the harmful and useless ghost waveforms mixed in the measurement data by the three-point measurement method conventionally performed with track inspection vehicles are completely removed, and the track is correct. A recorded waveform showing the shape of a curve can be obtained, and there is an effect that the judgment and evaluation of data for both deviations in alignment and deviations in height can be made extremely easy and accurate.
In addition, the details of the device according to the present invention are as follows: The initial value setting method is realized by a circuit such that temperature = 〒'' bird product = temperature decreases, and unnecessary long wavelengths are not used when recording the calculation results. Practical implementation is being considered in many ways, such as removing data from curved and sloped sections and recording only the amount of deviation in the wavelength band that is truly necessary for track maintenance in order to improve recording accuracy. It has a great potential to contribute in this direction.

[Brief explanation of the drawing]

Fig. 1 is a diagram explaining the definition of track deviation, Fig. 2a is a layout diagram of a track deviation detection mechanism in a track inspection vehicle, Fig. 2b is an external perspective view of a conventional height deviation detection mechanism, Figures 3 a-c are diagrams explaining the state of occurrence of ghost waveforms in the three-point measurement method, Figures 4 a-c are waveform curve diagrams of the amount of deviation determined by calculation in the three-point measurement method, and Figures 5 to 5 Each of Figures 9 shows an embodiment of the present invention, Figure 5 is an explanatory diagram of a function of a trajectory curve to explain the basic theory of the orbit error calculating device, and Figure 6 is an illustration of the basic theory explained in Figure 5. Fig. 7 is an explanatory diagram of how to obtain the coordinate axes in the three-point measurement method, and Fig. 8 is an explanation of initial value setting in the orbit deviation calculation device. A schematic diagram of a railway track, FIG. 9 is a block diagram of the entire track deviation calculation device, and FIG. 10 is a detailed block diagram of the original curve calculation circuit and initial value setting circuit in FIG. 1... Rules, 1a... Street crazy club, 2
...Measurement string (string), 3...Car body, 4
......Dolly, 4a, 4b...Bearing, 5.
...Measurement wheel, 5a...Front wheel, 5b.
...Central wheel, 5c...Rear wheel, 6...
...Rotating shaft, 7...Connecting rod, 8...
・Air cylinder, 9, 10...Arm, 11・
...uniball joint, 12...7...bearing,
13...Transducer, 13a...Central axis of the converter, 13b...Mounting axis of the converter, 15...
...3-point measurement system, 16...A/D converter,
17... Sampling generator, 18...
・Original curve calculation circuit, 19...Digital filter, 20...D/A converter, 21...Recorder, 22...Initial value setting circuit , 23...
...Double value and sign inversion circuit, 24...Adder,
25a... Pre-shift register, 25b...
...Post-shift register, 26...Double value circuit, 27...Sign inversion circuit, 28a, 28b.
...Switcher, 29...Analog sample hold circuit, 30...Analog comparator, 31
...6'1σ5 pulse counter, 32...
. . . Length integration circuit, 33 . . . Scheduled interval storage circuit, 34, 35, 36 . . . AND circuit, 37 . .
...゜゜゛pulse detector, 38...゜1/2゛pulse detector, 39゜゜゛initial value storage circuit.

Claims (1)

[Claims] 1. A trajectory curve calculation circuit having an analog-to-digital converter, a digital adder, and a shift register for delaying calculation data, a sampling pulse generator for generating distance-proportional sampling pulses, and a sampling pulse generator for generating calculation data. It consists of an initial value setting circuit that can set and reset initial values, a digital filter that can remove wavelength components above a certain wavelength from calculated data, and a digital-to-analog converter. After converting the deviation data or height deviation data into a digital quantity by the analog-to-digital converter for each distance-proportional sampling pulse, it is added to one terminal of the digital adder, and a part of the output of the adder is sent to the shift register. and the above distance-proportional sampling pulse, the chord lengths 1 and 1/ of the three-point measurement method are
Create two signals delayed by a distance interval corresponding to A track deviation calculation device characterized by being able to output and record track curves on a plane or in a vertical section. 2 The initial value setting circuit is an analog sample hold circuit,
Has an analog comparator and a “10” pulse counter,
A monitoring circuit that can detect that the amount of track deviation is below a certain limit value over a certain distance using a three-point measurement method, a distance integration circuit, and a distance accumulation circuit that stores the distance value for the scheduled section of the initial value setting and calculates the distance traveled. It is composed of a scheduled section memory circuit and an initial value memory circuit that can read out the scheduled section by inputting numerical values and output a signal during the section.
When the amount of street deviation or height deviation obtained by the point measurement method continues to be below a certain limit, the signal output from the monitoring circuit and the planned area for the distance indicated by the distance integration circuit are used to record the scheduled area memory. When the output signals of the circuit match, the initial value stored in the initial value storage circuit can be input to the digital adder instead of the two delayed signals output from the shift register. An orbital deviation calculation device according to claim 1, characterized in that: