JP6664304B2 - Displacement measuring device and displacement measuring method - Google Patents

Description

  The present invention relates to a displacement measuring device and a displacement measuring method, and more particularly to a displacement measuring device and a displacement measuring method for measuring a displacement of a slope having a possibility of landslide.

  In the conventional displacement measurement system, a transmitter is installed at the measurement point, radio waves from the transmitter are received by multiple receiving antennas installed at fixed points, and the transmitter position is calculated from the phase difference between the receiving antennas Then, the displacement of the transmitter position is obtained (for example, see Patent Document 1).

  In the above-described conventional displacement measurement system, since it is necessary to compare the phases between the receiving antennas, the signals from the plurality of receiving antennas are transmitted to a common receiver via a wired cable, and a common local signal and a clock signal are transmitted. After performing the frequency conversion and the A / D conversion, the phase difference between the received signals is calculated by digital signal processing.

JP 2006-349515 A

  As described above, in the conventional displacement measurement system, a frequency converter and an A / D converter are required to calculate a phase difference, and these devices are expensive. There was a problem that it would be.

  SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and eliminates the need for a frequency converter and an A / D converter. It is an object to obtain a measuring device and a displacement measuring method.

The present invention is provided at a measurement point, a transmitter that transmits a signal for measurement, a plurality of receivers that are installed at a plurality of fixed points and receive the signal for measurement transmitted from the transmitter, Measuring a reception phase difference between the paired two receivers based on a first reception signal and a second reception signal received by the two paired receivers selected from the receivers And a positioning calculator for measuring the displacement of the position of the transmitter based on the reception phase difference measured by the phase difference measurement unit, the first reception signal and the second A phase shifter that shifts the phase of the second received signal by a desired angle so that the phase difference between the second received signal and the second received signal does not exceed a preset range. has a coupler, said first reception signal, said first And a reception signal the received signal is shifted by the phase shifter is input to the hybrid coupler, based on the power ratio of the output signal outputted from said hybrid coupler, the first reception signal and the second 2 is a displacement measurement device that calculates the reception phase difference between the pair of receivers that have received the second reception signal .

  According to the displacement measurement device according to the present invention, the phase difference measurement unit has the hybrid coupler, inputs the received signals received by at least the pair of receivers to the hybrid coupler, and outputs the signals from the hybrid coupler. Since the reception phase difference between the pair of receivers is calculated based on the power ratio of the output signal, and the displacement of the position of the measurement point is measured from the reception phase difference, the frequency converter and the A / D are used. The position and the displacement of the transmitter can be obtained with a configuration using an inexpensive hybrid coupler without using a converter.

FIG. 1 is a block diagram showing a configuration of a displacement measuring device according to Embodiment 1 of the present invention. FIG. 3 is a diagram illustrating a relationship between a phase difference of an input signal and a power ratio of an output signal in the displacement measuring device according to the first embodiment of the present invention. FIG. 2 is a block diagram illustrating a hardware configuration of a phase difference measurement unit and a positioning calculator in the displacement measurement device according to the first embodiment of the present invention. 5 is a flowchart showing an operation of the displacement measuring device according to the first embodiment of the present invention. FIG. 9 is a block diagram showing a configuration of a phase difference measurement unit in the displacement measurement device according to Embodiment 2 of the present invention. FIG. 9 is a diagram illustrating a relationship between a phase difference of a received signal and a power ratio of an output signal in the displacement measuring device according to the second embodiment of the present invention.

Embodiment 1 FIG.
FIG. 1 shows a configuration of a displacement measuring device according to Embodiment 1 of the present invention. As shown in FIG. 1, the displacement measuring device according to the present embodiment includes a transmitter 1, a plurality of slave receivers 2, and a master receiver 3 connected to the slave receiver 2.

  The transmitter 1 is installed at a measurement point. In the present embodiment, the measurement point will be described as, for example, one location on a slope where a landslide may occur. In the first embodiment, the displacement of the position of the measurement point is detected by installing the transmitter 1 at an arbitrary position on such a slope and measuring the displacement of the position of the transmitter 1. Thus, it is possible to determine whether or not a landslide may occur based on the amount of change in the position of the measurement point. The transmitter 1 transmits a measurement signal 101. The measurement signal 101 is composed of, for example, a continuous wave (CW) radio wave, but is not limited thereto, and may not be a continuous wave.

  Each slave receiver 2 is installed at a fixed point whose position is known. Each slave receiver 2 receives the measurement signal 101 from the transmitter 1. Each slave receiver 2 performs reception processing such as amplification on the measurement signal 101, and transmits a reception signal 102 obtained by the reception processing to the parent receiver 3. Each of the slave receivers 2 and the master receiver 3 are connected by, for example, an RF cable.

  As shown in FIG. 1, the master receiver 3 includes two or more phase shifters 4, two or more limiter amplifiers 5, two or more phase difference measurement units 6, and one positioning calculator 7. ing.

  The phase shifter 4 is connected to the slave receiver 2, and receives a received signal 102 from the slave receiver 2. The phase shifter 4 shifts the phase of the received signal 102 by a desired angle. The operation of the phase shifter 4 will be described later with reference to FIG. In the phase difference measuring section 6 provided at the subsequent stage, when the displacement of the measurement point is large, the phase difference exceeds a preset range, and in that case, it is difficult to obtain the phase difference. Therefore, the phase shifter 4 shifts the phase of the received signal 102 by a desired angle, so that the phase difference can be adjusted so as to stay within the preset range. Can be measured.

  The limiter amplifier 5 is connected to the slave receiver 2 directly or via the phase shifter 4. Accordingly, the limiter amplifier 5 receives the received signal 102 directly from the slave receiver 2 or receives the received signal 102 via the phase shifter 4. The limiter amplifier 5 performs a process of making the amplitude level of the received signals 102 constant.

  Each of the phase difference measuring units 6 receives, from the limiter amplifier 5, a received signal 102 having a constant amplitude level. The limiter amplifier 5 is previously selected two by two as a pair of combinations for measuring the phase difference, and forms a pair. The received signal 102 is input to each phase difference measuring unit 6 from the two limiter amplifiers 5 forming the pair. Each phase difference measuring section 6 measures the phase difference between the received signals. Hereinafter, the phase difference is referred to as a reception phase difference. Here, as shown in FIG. 1, each of the phase difference measuring units 6 includes one 90 ° hybrid coupler 8, two power measuring devices 9, one power comparator 10, and one phase difference calculating device 11 It is composed of The operation of each component of each phase difference measuring unit 6 will be described later.

  The phase difference measured by each phase difference measuring unit 6 is input to the positioning calculator 7. The positioning calculator 7 calculates the position and the displacement of the transmitter 1 based on the phase difference.

Next, the operation of the displacement measuring device according to the first embodiment will be described.
The transmitter 1 transmits a measurement signal 101. The plurality of slave receivers 2 receive the measurement signal 101 transmitted from the transmitter 1. Received signals 102 that have undergone reception processing at each child receiver 2 are collected at the parent receiver 3. In the parent receiver 3, those received signals 102 are input to the limiter amplifier 5 via the phase shifter 4 or not. In the limiter amplifier 5, the amplitude levels of those received signals are made constant. As described above, two limiter amplifiers 5 are selected as pairs of combinations for measuring the phase difference. Therefore, a pair of signals 103 a and 103 b are input to the phase difference measurement unit 6 from the pair of limiter amplifiers 5 selected in this manner. In order to measure the three-dimensional displacement of the transmitter 1, it is necessary to measure the phase difference by a combination of a plurality of slave receivers 2. In general, a plurality of phase difference measuring units 6 are required. In addition, the number of the phase difference measuring units 6 is required to be 計算 of the number of the child receivers 2 by a simple calculation. However, a plurality of pairs may share the phase difference measurement unit 6, and in that case, the number of the phase difference measurement units 6 can be reduced. A pair of selection methods of a combination for measuring a phase difference is, for example, to select a reception signal from two adjacent child receivers 2 or to select a line-symmetric or point-symmetric position based on an initial value of a measurement point. Since a selection method similar to that of the conventional displacement measurement device may be used, such as selecting reception signals from the two installed sub receivers 2, the description is omitted here.

Inside the phase difference measuring section 6, a pair of signals 103 a and 103 b are input to one 90 ° hybrid coupler 8. The 90 ° hybrid coupler 8 is generally used as an RF circuit. The 90 ° hybrid coupler 8 is a four-terminal power distributor having two input terminals and two output terminals, and has a 90 ° phase difference after distribution. At this time, for example, assuming that the complex amplitudes of the pair of input signals 103a and 103b are V _IN1 and V _IN2 , respectively, the complex amplitudes V _out1 and V _out2 of the output signals 104a and 104b output from the 90 ° hybrid coupler 8 are Each is given by the following equation (1). However, in Expression (1), j is an imaginary unit.

The complex amplitudes V _out1 and V _out2 of the output signals 104a and 104b thus obtained are input to the power _meter 9. The complex amplitudes V _out1 and V _out2 of the output signals 104a and 104b are converted into power values 105a and 105b by the power measuring devices 9 and input to the power comparator 10, respectively. In the power comparator 10, the power ratio _{R 12} represented by the following formula (2) is calculated and outputted as an output signal 106.

Here, the complex amplitudes V _IN1 and V _IN2 of the pair of input signals 103a and 103b to the 90 ° hybrid coupler 8 have the same amplitude and the same phase difference as shown in the following equation (3). and φ _12. The assumption of equal amplitude is ensured by the limiter amplifier 5 preceding the 90 ° hybrid combiner 8.

At this time, the complex amplitudes V _out1 and V _out2 of the pair of output signals 104a and 104b of the 90 ° hybrid coupler 8 are obtained by substituting the complex amplitudes V _IN1 and V _IN2 of Expression (3) into Expression (1). The following equations (4) and (5) are obtained, respectively.

Accordingly, the phase difference φ ₁₂ between the input signals 103a and 103b input to the 90 ° hybrid coupler 8 and the power ratio R ₁₂ (output signal 106) of the output signals 104a and 104b output from the 90 ° hybrid coupler 8 are: The following relational expression (6) holds between.

Accordingly, the phase difference calculator 11 uses the following equation (7) derived from equation (6) to output the power ratio R ₁₂ of the output signals 104a and 104b from the 90 ° hybrid coupler 8 (output signal 106). , The phase difference φ ₁₂ between the input signals 103 a and 103 b input to the 90 ° hybrid coupler 8 is calculated and output as the output signal 107.

In this way, the phase difference measuring unit 6 uses the pair of slave receivers 2 for measuring the phase difference from the power ratio R ₁₂ (output signal 106) of the output signals 104a and 104b from the 90 ° hybrid coupler 8. , The phase difference φ ₁₂ (output signal 107) between the input signals 103a and 103b.

FIG. 2 shows a relationship 206 between the phase difference φ ₁₂ (output signal 107) of the input signals 103a and 103b according to the equation (7) and the power ratio R ₁₂ (output signal 106) calculated by the power comparator 10. In FIG. 2, the horizontal axis represents the phase difference φ ₁₂ (output signal 107) between the input signals 103a and 103b. The vertical axis indicates the power ratio R ₁₂ (output signal 106) of the input signals 103a and 103b. As shown in FIG. 2, a pair of input signals 103a, the and 103b phase difference phi ₁₂ and the power ratio _{R 12} of a one-to-one relationship, the input signal 103a, 103b ranges the phase difference is ± 90 ° of Therefore, the phase shifter 4 is adjusted at the start of the measurement, for example, the phase difference is set to 0 °. If the displacement of the position of the transmitter 1 is small and the phase difference remains within the range of ± 90 °, the displacement can be continuously measured. On the other hand, when the displacement is expected to increase and the phase difference is expected to exceed the range of ± 90 °, the phase shifter 4 is adjusted for each measurement to keep the phase difference of the input signal within the range of ± 90 °. You can also do so. By doing so, the phase difference can be continuously measured even when the phase difference between the slave receivers 2 changes significantly.

In the above description has described the procedure for pairs of combinations of slave receiver 2 of the identification numbers 1 and 2 obtains the phase difference phi _12. By the same procedure, the phase difference φ _mn (m and n are identification numbers of the slave receivers 2) is calculated for the other pairs of combinations of the slave receivers 2 as well. The child receivers 2 with the identification numbers m and n are hereinafter referred to as child receiver #m and child receiver #n, respectively. Using the phase difference φ _mn between all the child receivers _#m and #n obtained in this way, the positioning calculator 7 solves the following equation (8), and displaces the position of the transmitter 1. Is measured.

In the above equation (8), (x, y , z) is the position of the transmitter 1 to be _{obtained, (X m, Y m,} Z m) in the position of the slave receiver #m, (X _n, Y _n, Z _n) is the position of the slave receiver #n. Ξ _m is the phase difference of the slave receiver #m given by the phase shifter 4, は_n is the phase difference of the slave receiver #n given by the phase shifter 4, and N _mn is a phase numerical bias. is there.

The positions (X _m , Y _m , Z _m ) and (X _n , Y _n , Z _n ) of the slave receivers #m and _#n are known numbers, for example, measured in advance. In addition, the phase characteristic numerical bias N _mn can be known by previously measuring the approximate position of the transmitter by another means before measurement or by calculating using the result of the previous positioning calculation or the like. . Therefore, since there are three unknown variables of the terminal position (x, y, z), if there are four or more child receivers, three independent equations are obtained, and the detailed three-dimensional position of the transmitter 1 is obtained. Can be requested. As described above, the displacement can be measured by calculating the position of the transmitter 1 with high accuracy for each measurement and obtaining the difference from the previous position.

  If the required displacement measurement direction is only one-dimensional, the number of unknown variables is one. Therefore, only two child receivers 2, one phase difference measurement unit 6, and the positioning calculator 7 are used. By using this, a lower-cost displacement measuring device can be realized.

  Further, a similar displacement measuring device can be realized by using a 180 ° hybrid coupler or another coupler instead of the 90 ° hybrid coupler in the present embodiment.

  Note that the phase difference measurement unit 6 and the positioning calculator 7 in the present embodiment can be realized using a general personal computer 14, a wireless adapter 12, and the like. FIG. 3 shows an example.

  As shown in FIG. 3, the personal computer 14 includes a processor 15, a memory 16, an external device interface 17, a display interface 18, and the like. A display 19 is connected to the display interface 18. The external device interface 17 is assumed to be a USB terminal or the like, and a plurality of wireless adapters (such as wireless LAN) 12 are connected to the external device hub 13 through an external device hub 13.

  Output signals from the plurality of 90 ° hybrid couplers 8 are connected to antenna terminals of the wireless adapter 12. Many wireless adapters 12 are equipped with a power measuring function, and can receive received power information from the personal computer 14 by software.

  The received power information obtained in this way is processed in software by the personal computer 14, and the functions of the power meter 9, the power comparator 10, the phase difference calculator 11, and the positioning calculator 7 can be realized. The result can be displayed on the display 19 via the interface 18.

  That is, the power measuring device 9, the power comparator 10, the phase difference calculator 11, and the positioning calculator 7 are realized by the processor 15 executing a program stored in the memory 16. Further, a plurality of processors and a plurality of memories may cooperate to execute the above function.

  Next, FIG. 4 shows a flowchart of software for realizing the present embodiment using the personal computer 14 shown in FIG. The processing procedure is described below.

  Step S1: The personal computer 14 acquires reception power information from all the connected wireless adapters 12.

Step S2: The personal computer 14 calculates the power ratio R ₁₂ (output signal 106) of the pair of output signals 104a and 104b of all the 90 ° hybrid couplers 8 from the received power information obtained in step S1.

Step S3: The personal computer 14 calculates the phase difference φ between the pair of input signals of all the 90 ° hybrid couplers 8 from the power ratio R ₁₂ (output signal 106) obtained in step S2 using the above equation (7). Calculate ₁₂ .

Step S4: the computer 14, a plurality of phase difference phi ₁₂ obtained in step S3, and substituted into the above equation (8), (x, y , z) solving simultaneous equations relating to, calculate the position of the transmitter 1 I do.

  Step S5: The position or displacement (difference from the initial position) of the transmitter 1 obtained in step S4 is displayed on the display 19.

  When the displacement amount is continuously measured, the above steps S1 to S5 are repeated.

  The present embodiment can be realized by operating software having the above procedure on a personal computer.

  As described above, according to the present embodiment, an inexpensive 90 ° hybrid coupler 8, an electric power measuring device 9, an electric power comparator 10, or an inexpensive 90 ° hybrid coupler 8, without using an expensive frequency converter or A / D converter. Since the phase difference between the slave receivers 2 can be measured using the 90 ° hybrid coupler 8, the personal computer 14, the wireless adapter 12, and the like, the position of the transmitter 1 and its displacement as a time change can be obtained. Thus, a low-cost displacement measuring device can be realized.

Embodiment 2 FIG.
In Embodiment 1 described above, the range in which the phase difference can be measured is limited to ± 90 ° as shown in FIG. 2 due to the operation of the 90 ° hybrid coupler. By using the hybrid coupler and the 180 ° hybrid coupler in combination, the range of the measurable phase difference is expanded to ± 180 °.

  The difference from the first embodiment is only the internal configuration of the phase difference measuring unit 6. That is, in the configuration of the displacement measuring device according to the present embodiment, a phase difference measuring unit 6 shown in FIG. 5 is provided instead of the phase difference measuring unit 6 in FIG. As described above, the difference between the present embodiment and the first embodiment is only the internal configuration of the phase difference measurement unit 6, and the description of the other configurations will be omitted.

  FIG. 5 shows an internal configuration of the phase difference measurement unit 6 in the present embodiment. The phase difference measuring unit 6 includes two distributors 31a and 31b, a 90 ° hybrid coupler 32a connected to the distributors 31a and 31b, and a 180 ° hybrid coupler 32b connected to the distributors 31a and 31b. , 90 ° hybrid coupler 32a and 180 ° hybrid coupler 32b, a total of four power meters 33, a total of two power comparators 34 connected to power meter 33, and their power comparison. And a phase difference calculator 35 connected to the device 34.

  In the present embodiment, of the pair of input signals 103a and 103b input to the phase difference measurement unit 6, the input signal 103a is input to the distributor 31a, and the input signal 103b is input to the distributor 31b. The input signal 103a is split into two by the splitter 31a, one of which is input to the 90 ° hybrid coupler 32a and the other is input to the 180 ° hybrid coupler 32b. Similarly, input signal 103b is split into two by splitter 31b, one of which is input to 90 ° hybrid coupler 32a and the other is input to 180 ° hybrid coupler 32b.

  Regarding the processing procedure of the 90 ° hybrid coupler 32a and the power measuring device 33 and the power comparator 34 connected thereto, the 90 ° hybrid coupler 8 described in the first embodiment and the power measuring device 9 connected thereto are described. Since the processing procedure is the same as that of the power comparator 10, the description is omitted here.

  On the other hand, the processing procedure of the 180 ° hybrid coupler 32b and the power measuring device 33 and the power comparator 34 connected thereto will be described later.

Next, the operation of the displacement measuring device according to the present embodiment will be described.
Also in the present embodiment, as in Embodiment 1, as shown in FIG. 1, transmitter 1 transmits measurement signal 101. The plurality of slave receivers 2 receive the measurement signal 101 transmitted from the transmitter 1. Received signals 102 that have undergone reception processing at each child receiver 2 are collected at the parent receiver 3. In the parent receiver 3, those received signals 102 are input to the limiter amplifier 5 via the phase shifter 4 or not. In the limiter amplifier 5, the amplitude levels of those received signals are made constant. The received signals having a fixed amplitude level are selected two by two as pairs of combinations for measuring the phase difference, and become input signals 103a and 103b. The pair of input signals 103a and 103b selected in this way are input to the phase difference measuring unit 6. The operation so far is the same as in the first embodiment.

  In the present embodiment, in the phase difference measuring section 6, first, the two distributors 31a and 31b respectively distribute the pair of input signals 103a and 103b into two. A signal obtained by dividing the input signal 103a into two is hereinafter referred to as an input signal 201a, and a signal obtained by dividing the input signal 103b into two is hereinafter referred to as an input signal 201b. The input signals 201a and 201b are input to both the 90 ° hybrid coupler 32a and the 180 ° hybrid coupler 32b, respectively. The processing procedure of the signal distributed to the 90 ° hybrid coupler is the same as in the first embodiment, and a description thereof will be omitted.

The processing procedure of the signal supplied to the 180 ° hybrid coupler 32b will be described. The 180 ° hybrid coupler 32b is generally used as an RF circuit. The 180 ° hybrid coupler 32b is a four-terminal power divider having two input terminals and two output terminals, and has a phase difference of 180 ° after distribution. Assuming that the complex amplitudes of the pair of input signals 201a and 201b for measuring the phase difference are V _IN1 and V _IN2 , respectively, the complex amplitudes V _{outB_1} and V _{outB_2 of the} pair of output signals 202a and 202b output from the 180 ° hybrid coupler 32b. Are respectively given by the following equation (9).

The complex amplitudes V _{outB — 1} and V _{outB — 2} of the pair of output signals 202 a and 202 b are converted into power values 203 a and 203 _b by the power _meter 33, respectively, and the power comparator 34 calculates the power as shown in the following equation (10). The ratio _{RB_12} is calculated and output as the output signal 204.

Here, a pair of input signals 201a to 180 ° hybrid coupler 32 b, 201b, as shown in the following equation (11), equal amplitude, phase difference and phi _12. The assumption of equal amplitude is ensured by the limiter amplifier 5 preceding the 180 ° hybrid combiner 32b.

At this time, by substituting V _IN1 and V _IN2 of Expression (11) into Expression (9), the complex amplitudes V _{outB_1} and V _{outB_2} of the pair of output signals 202a and 202b of the 180 ° hybrid coupler 32b are respectively obtained. And the following equations (12) and (13).

Thus, a pair of input signals 201a to 180 ° hybrid coupler 32b, and 201b phase difference phi ₁₂ of, between the pair of output signals 202a, 202b of the power ratio 204, the following relational expression (14) Holds.

FIG. 6 shows a relation (205) between the phase difference of the input signal of the 180 ° hybrid coupler 32b based on the relational expression of the equation (14) and the power ratio of the output signal, and 90 ° based on the relational expression of the equation (6). The relation (206) between the phase difference of the input signal of the hybrid coupler 32a and the power ratio of the output signal is shown. 6, the horizontal axis is a phase difference phi ₁₂ of the input signal. The vertical axis is the power ratio R _{12 of the} output signal (output signals 106 and 204).

  As shown in FIG. 6, the relation (205) between the phase difference of the input signal of the 180 ° hybrid coupler 32b and the output signal power ratio, and the power ratio of the input signal and the output signal of the 90 ° hybrid coupler 32a. (206). For example, if the relationship (206) between the phase difference of the input signal of the 90 ° hybrid coupler 32a and the power ratio of the output signal (206) is a mirror image relationship of 0 ° to 90 ° and 90 ° to 180 °, the 180 ° hybrid coupler 32b The sign of the dB value of the power ratio is inverted, and the input signal phase difference between 0 ° to 90 ° and 90 ° to 180 ° can be distinguished.

  Similarly, when the relationship (206) between the phase difference of the input signal of the 90 ° hybrid coupler 32a and the power ratio of the output signal is −180 ° to −90 ° and −90 ° to 0 °, which are mirror image relationships, 180 ° The sign of the dB value of the power ratio of the hybrid coupler 32b is inverted, and it is possible to distinguish the phase difference between the input signals of −180 ° to −90 ° and −90 ° to 0 °. Thus, by referring to the power ratio of the output signal of the 180 ° hybrid coupler 32b, it is possible to measure the range of the total phase difference of ± 180 °.

Note that the power ratio of the output signal of the 180 ° hybrid coupler 32b is used not only for identifying the mirror image relationship of the power ratio of the output signal of the 90 ° hybrid coupler 32a, but also for the following equation derived from equation (14). The equation (15) can be used to calculate the phase difference φ ₁₂ (reference numeral 107) of the input signal. Accordingly, the phase difference calculator 35, the following equation (15), calculates a phase difference phi _12.

In the present embodiment, the phase difference calculator 35 calculates the phase difference φ12 (reference numeral 107) by the equation (7) using the power ratio of the output signal of the 90 ° hybrid coupler 32a, and also performs the 180 ° hybrid coupling. calculating a phase difference phi ₁₂ by equation (15) using a power ratio of the output signal of the vessel 32b. The phase difference calculator 35 calculates the average value of the two phase differences φ ₁₂ and outputs the average value as the phase difference 205.

  As described above, according to the present embodiment, the phase difference is calculated and averaged from both the power ratio of the output signal of the 90 ° hybrid coupler 32a and the power ratio of the output signal of the 180 ° hybrid coupler 32b. Thereby, the phase difference can be calculated with higher accuracy.

  Note that the procedure of measuring the displacement by the positioning calculator 7 is the same as that of the first embodiment, and therefore the description is omitted.

  As described above, also in the present embodiment, the same effect as in the first embodiment can be obtained. Further, according to the present embodiment, since the phase difference can be measured in the entire range of ± 180 degrees, it is possible to continuously measure the displacement measurement without operating the phase shifter 4 during the measurement. Becomes Therefore, in the present embodiment, the phase shifter 4 need not be provided. Further, the phase difference can be calculated with high accuracy by using both the power ratio of the output signal of the 90 ° hybrid coupler 32a and the power ratio of the output signal of the 180 ° hybrid coupler 32b. Can measure the displacement.

  Reference Signs List 1 transmitter, 2 child receivers, 3 parent receivers, 4 phase shifters, 5 limiter amplifiers, 6 phase difference measurement unit, 7 positioning calculator, 8 90 ° hybrid coupler, 9 power measurement device, 10 power comparator , 11 phase difference calculator, 12 wireless adapter, 13 external device hub, 14 personal computer, 15 processor, 16 memory, 17 external device interface, 18 display interface, 19 display, 31a, 31b distributor, 32a 90 ° hybrid coupling Device, 32b 180 ° hybrid coupler, 33 power measuring device, 34 power comparator, 35 phase difference calculator.

Claims (6)

A transmitter installed at the measurement point and transmitting a measurement signal,
A plurality of receivers installed at a plurality of fixed points and receiving the measurement signal transmitted from the transmitter,
A receiving phase difference between the paired two receivers based on a first received signal and a second received signal received by the two paired receivers selected from the plurality of the receivers; A phase difference measuring unit for measuring
A positioning calculator that measures displacement of the position of the transmitter based on the reception phase difference measured by the phase difference measurement unit,
A phase shifter that shifts the phase of the second reception signal by a desired angle so that the phase difference between the first reception signal and the second reception signal does not exceed a preset range. ,
The phase difference measurement unit has a hybrid coupler, the first received signal , the second received signal and the received signal shifted by the phase shifter is input to the hybrid coupler, Calculating the reception phase difference between the pair of receivers that have received the first reception signal and the second reception signal , based on a power ratio of an output signal output from the hybrid coupler;
Displacement measuring device. The phase difference measurement unit has a 90 ° hybrid coupler as the hybrid coupler.
The displacement measuring device according to claim 1. The phase difference measurement unit has a 180 ° hybrid coupler as the hybrid coupler.
The displacement measuring device according to claim 1. A transmitter installed at the measurement point and transmitting a measurement signal,
A plurality of receivers installed at a plurality of fixed points and receiving the measurement signal transmitted from the transmitter,
A phase difference measurement unit that measures a reception phase difference between the two receivers in the pair based on the reception signals received by the two receivers in the pair selected from the plurality of receivers.
A positioning calculator that measures displacement of the position of the transmitter based on the reception phase difference measured by the phase difference measurement unit,
The phase difference measurement unit has a hybrid coupler, inputs the received signals received by at least one pair of the receiver to the hybrid coupler, based on the power ratio of the output signal output from the hybrid coupler Calculating the reception phase difference between the pair of receivers ,
The phase difference measurement unit has a 90 ° hybrid coupler and a 180 ° hybrid coupler as the hybrid coupler,
The phase difference measurement unit divides the received signals received by the at least one pair of receivers into two, and inputs the received signals to both the 90 ° hybrid coupler and the 180 ° hybrid coupler, and the 90 ° hybrid Calculating the reception phase difference between the receivers based on both the power ratio of the output signal output from the coupler and the power ratio of the output signal output from the 180 ° hybrid coupler,
Displacement measuring device. Installing a transmitter at the measurement point, transmitting a signal for measurement from the transmitter,
Installing a receiver at a plurality of fixed points, receiving the measurement signal transmitted from the transmitter at the receiver,
The second received signal is received by at least one pair of receivers selected from a plurality of the receivers, so that the phase difference between the first received signal and the second received signal does not exceed a predetermined range, the second received signal Shifting the phase of the received signal by a desired angle by a phase shifter;
The first received signal and the received signal obtained by shifting the second received signal by the phase shifter are input to a hybrid coupler, and based on a power ratio of an output signal output from the hybrid coupler. Calculating a reception phase difference between the pair of receivers,
Measuring the displacement of the position of the transmitter based on the calculated reception phase difference. Installing a transmitter at the measurement point, transmitting a signal for measurement from the transmitter,
Installing a receiver at a plurality of fixed points, receiving the measurement signal transmitted from the transmitter at the receiver,
A received signal received by at least a pair of the receivers selected from the plurality of receivers is input to a hybrid coupler, and based on a power ratio of an output signal output from the hybrid coupler, the pair of the receivers Calculating a reception phase difference between the receivers;
Based on the calculated reception phase difference, Bei example a step of measuring a displacement of the position of the transmitter,
The step of calculating the reception phase difference,
As the hybrid coupler, using a 90 ° hybrid coupler and a 180 ° hybrid coupler,
The received signals received by the at least one pair of receivers are respectively divided into two and input to both the 90 ° hybrid coupler and the 180 ° hybrid coupler, and the output output from the 90 ° hybrid coupler Calculating the reception phase difference between the receivers based on both the power ratio of the signal and the power ratio of the output signal output from the 180 ° hybrid coupler,
Displacement measurement method.

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