Measuring device

Abstract

To solve the problem that it is sometimes difficult to monitor the normality of a monitor circuit for monitoring a transmission signal while monitoring the transmission signal.SOLUTION: A measurement device that radiates a transmission signal for position measurement to a space includes a monitor circuit that monitors whether or not an abnormality occurs in the transmission signal, and a comparison circuit that receives inputs of a measurement value measured by the monitor circuit and a measurement value measured by a sub monitor circuit that measures the transmission signal separately from the monitor circuit, and compares the received measurement values to monitor the monitor circuit.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a measurement device and a measurement method. [Background technology]

[0002] It is known that the position of a moving object such as an aircraft can be measured by using a GNSS (Global Navigation Satellite System) positioning system.

[0003] Patent Document 1, for example, is an example of technology related to GNSS positioning systems. Patent Document 1 discloses a detection method used to detect GNSS signal anomalies. According to this method, GNSS signals transmitted from multiple satellites are received via at least three antennas. For each combination of two of at least three receivers provided corresponding to each of the at least three antennas, if the internal times of the two receivers are not synchronized, the combination of the two antennas corresponding to each of the two receivers is classified as a time synchronization anomaly. For each combination of two of the at least three antennas, if the number of satellites simultaneously tracked by the two antennas is less than a predetermined threshold, the combination of the two antennas is classified as a satellite number anomaly. For each combination of two antennas not classified as either a time synchronization anomaly or a satellite number anomaly, for each combination of two satellites simultaneously tracked by the two antennas, if a path difference index indicating the difference in path from each of the two satellites to each of the two antennas is equal to or less than a predetermined path difference threshold, the two satellites are classified as a path difference anomaly. Then, when the number of satellites classified as having a trajectory difference is equal to or greater than a predetermined threshold, it is determined that an abnormality has occurred in the GNSS signal. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-168271 Summary of the Invention [Problem to be solved by the invention]

[0005] When a failure occurs in a GNSS positioning system such as that described in Patent Document 1, a measurement device such as a DME (Distance Measuring Equipment) device or a TACAN (Tactical Air Navigation) device may be used as an alternative. When a measurement device is used as an alternative to a GNSS positioning system, the device must have integrity so as not to send erroneous signals to aircraft.

[0006] This integrity can be ensured by adding a function to the measuring device that monitors the normality of the monitor circuit using, for example, a Monitor Integrity Test (MIT) circuit that monitors normality.However, this has caused a problem in that while the normality of the monitor circuit is being monitored by the MIT circuit, field signals such as DME transmission signals cannot be monitored.

[0007] Therefore, one object of the present disclosure is to provide a measurement device and a measurement method that can solve the above-mentioned problems. [Means for solving the problem]

[0008] In order to achieve this purpose, the measurement device in the present disclosure comprises: A measurement device that radiates a transmission signal for position measurement into space, a monitor circuit for monitoring whether an abnormality occurs in the transmission signal; a comparison circuit that receives an input of a measurement value measured by the monitor circuit and a measurement value measured by a sub-monitor circuit that measures the transmission signal separately from the monitor circuit, and compares the received measurement values ​​to monitor the monitor circuit; have The structure is as follows.

[0009] Further, the measurement method in the present disclosure includes: A measuring device that emits a transmission signal for position measurement into space, A monitor circuit is used to monitor whether an abnormality occurs in the transmission signal, The monitor circuit is monitored by receiving input of a measurement value measured by the monitor circuit and a measurement value measured by a sub-monitor circuit that measures the transmission signal separately from the monitor circuit, and comparing the received measurement values. The structure is as follows. [Effects of the Invention]

[0010] According to the above-described configurations, it is possible to monitor the normality of the monitor circuit while monitoring a field transmission signal such as a DME transmission signal. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a measurement system according to the present disclosure. [Figure 2] FIG. 1 is a diagram illustrating an example of the configuration of a DME device related to the present disclosure. [Figure 3] FIG. 1 is a diagram illustrating an example of the configuration of a DME device included in a measurement system according to the present disclosure. [Figure 4] 10 is a flowchart showing an example of the operation of the DME device. [Figure 5] 10 is a flowchart showing an example of the operation of the DME device. [Figure 6] FIG. 1 is a block diagram illustrating an example configuration of a measurement device according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0012] [First embodiment] An example configuration of a measurement system 100 in the present disclosure will be described with reference to Figs. 1 to 5. Fig. 1 is a diagram showing an example configuration of the measurement system 100. Fig. 2 is a diagram showing an example configuration of a DME (Distance Measuring Equipment) device 300, which is a measurement device related to the present disclosure. Fig. 3 is a diagram showing an example configuration of a DME device 200, which is a measurement device included in the measurement system 100. Figs. 4 and 5 are flowcharts showing an example operation of the DME device 200. Note that in the present disclosure, the drawings may be associated with one or more embodiments.

[0013] This disclosure describes a DME device 200, which is a measurement device that emits a transmission signal for position measurement, such as a DME transmission signal, into space. As described below, the DME device 200 uses monitor circuits 207 and 208 to monitor whether an abnormality has occurred in a detection signal obtained by detecting a transmission signal. In addition to performing the above monitoring, the DME device 200 also monitors the normality of the monitor circuit 207 by using a comparison circuit 219 to compare a measurement value obtained by the monitor circuit 207 with a measurement value obtained by the sub-monitor circuit 218. Similarly, the DME device 200 monitors the normality of the monitor circuit 208 by using a comparison circuit 220 to compare a measurement value obtained by the monitor circuit 208 with a measurement value obtained by the sub-monitor circuit 218. For example, as described above, the DME device 200 includes sub-monitor circuits 217 and 218 and comparison circuits 219 and 220 in addition to the monitor circuits 207 and 208, thereby monitoring the detection signal and monitoring whether the monitor circuits 207 and 208 that monitor the detection signals are operating correctly.

[0014] Furthermore, the DME device 200 can be configured to monitor the normality of the sub-monitor circuits 217, 218 by using monitor integrity test (MIT) circuits 205, 206 that monitor normality. In other words, by having the MIT circuits 205, 206, the DME device 200 can check whether the sub-monitor circuits 217, 218 are operating correctly. By checking the operation of the sub-monitor circuits 217, 218 with this configuration, the DME device 200 can more appropriately monitor the normality of the monitor circuits 207, 208.

[0015] Fig. 1 shows an example of the configuration of a measurement system 100 including a DME device 200 as described above. As shown in Fig. 1, the DME device 200 causes a mobile object such as an aircraft to measure its position by, for example, emitting a DME transmission signal. For example, the mobile object can measure its position by measuring the time it takes for a signal to be transmitted and received between the mobile object and the DME device 200, among multiple DME devices 200. As an example, the DME device 200 may be a measurement device such as a ground station installed on the ground.

[0016] Before describing an example configuration of DME device 200, an example configuration of DME device 300, which is a measurement device related to the present disclosure, will be described with reference to Fig. 2. Fig. 2 shows an example configuration of DME device 300, which is a measurement device related to the present disclosure. As shown in Fig. 2, DME device 300 monitors the normality of monitor circuits 307 and 308 by using MIT circuits 305 and 306 that monitor normality.

[0017] Specifically, for example, in a normal DME operating state, when transceiver 310 is set as the active system, on signal 1 causes transceiver 310 to enter a transmission state in which it outputs RF (Radio Frequency) transmission signal 1. Furthermore, by inputting a system switching signal to coaxial switcher 313, transceiver 310 and antenna 314 are connected. As a result, RF transmission signal 1 output by transceiver 310 is input to antenna 314. As a result, antenna 314 radiates a DME transmission signal into the air.

[0018] Furthermore, RF monitor signals 1 and 2 are folded back within antenna 314. RF detector 301 detects RF monitor signal 1 folded back within antenna 314. Similarly, RF detector 302 detects RF monitor signal 2 folded back within antenna 314. Thereafter, monitor circuit 307 monitors the detection signal detected by RF detector 301, and outputs alarm signal 1 if an abnormality is detected. Similarly, monitor 308 monitors the detection signal detected by RF detector 302, and outputs alarm signal 1 if an abnormality is detected. For example, monitor circuits 307 and 308 may detect an abnormality if the detection signal does not satisfy a condition.

[0019] When at least one of alarm signals 1 and 2 is input to control circuit 309, control circuit 309 outputs an OFF signal to transceiver 310. Then, upon receiving the OFF signal, transceiver 310 stops outputting RF transmission signal 1. As a result, output of the abnormal DME transmission signal from antenna 314 stops.

[0020] Furthermore, the DME device 300 can automatically and periodically perform health tests on the monitor circuits 307 and 308 using the MIT circuits 305 and 306. The intervals between health tests may be set arbitrarily.

[0021] For example, when a normality test of the monitor circuit 307 is performed, the switch 303 is switched and then the MIT circuit 305 inputs the MIT signal 1 to the monitor circuit 307. The MIT circuit 305 monitors the normality of the monitor circuit 307 in response to the input of the MIT signal 1 to the monitor circuit 307. Furthermore, when the MIT circuit 305 detects an abnormality in the monitor circuit 307, the MIT circuit 305 notifies an operator of a monitor abnormality signal (MON FAIL signal) indicating the abnormality in the monitor circuit 307. The MIT circuit 305 may detect the presence or absence of an abnormality by, for example, checking whether the monitor circuit 307 is performing appropriate measurements for the MIT signal 1. Similarly, when a normality test of the monitor circuit 308 is performed, the switch 304 is switched and then the MIT circuit 306 inputs the MIT signal 2 to the monitor circuit 308. The MIT circuit 306 monitors the normality of the monitor circuit 308 in response to the input of the MIT signal 2 to the monitor circuit 308. Furthermore, when the MIT circuit 306 detects an abnormality in the monitor circuit 308, the MIT circuit 306 notifies the operator of a monitor abnormality signal (MON FAIL signal) indicating the abnormality in the monitor circuit 308. The MIT circuit 306 may detect the abnormality in the monitor circuit 308 by performing the same processing as the MIT circuit 305.

[0022] For example, as described above, when the MIT circuits 305 and 306 are used to monitor the normality of the monitor circuits 307 and 308, it is necessary to switch the connection using the switches 303 and 304. As a result, a problem arises in that the monitor circuits 307 and 308 cannot monitor the detection signals 1 and 2 while the MIT circuits 305 and 306 are performing normality tests on the monitor circuits 307 and 308.

[0023] In this way, the above-mentioned problems arise in the case of DME device 300 that uses MIT circuits 305 and 306 to monitor the normality of monitor circuits 307 and 308. Therefore, measurement system 100 at least partially replaces the above-mentioned DME device 300 with DME device 200 that has a configuration that solves the above-mentioned problems. The configuration of DME device 200 will be described in more detail below.

[0024] Fig. 3 shows an example of the configuration of the DME device 200. Referring to Fig. 3, the DME device 200 has, for example, the following configuration. RF detectors 201, 202, 215, and 216 that detect the RF monitor signal folded back within the antenna 214. A monitor circuit 207 monitors the detection signal 1 detected by the RF detector 201, and outputs an alarm signal 1 to the control circuit 209 if an abnormality is detected. In addition to outputting the alarm signal 1, the monitor circuit 207 also outputs a measurement value of the detection signal 1 (transmission pulse waveform) to the comparison circuit 219. A monitor circuit 208 monitors the detection signal 2 detected by the RF detector 202, and if an abnormality is detected, outputs an alarm signal 2 to a control circuit 209. In addition to outputting the alarm signal 2, the monitor circuit 208 also outputs a measurement value of the detection signal 2 (transmission pulse waveform) to a comparison circuit 220. A sub-monitor circuit 217 that outputs a measurement value of the detection signal 3 (transmission pulse waveform) detected by the RF detector 215 to a comparison circuit 219 . A sub-monitor circuit 218 that outputs a measurement value of the detection signal 4 (transmission pulse waveform) detected by the RF detector 216 to the comparison circuit 220. An MIT circuit 205 (normality test circuit) that performs a normality test on the sub-monitor circuit 217 using the MIT signal 1, and outputs a sub-monitor abnormality signal (SUB MON FAIL signal) to the operator if an abnormality is detected. An MIT circuit 206 (normality test circuit) that performs a normality test on the sub-monitor circuit 218 using the MIT signal 2, and outputs a sub-monitor abnormality signal (SUB MON FAIL signal) to the operator if an abnormality is detected. A switch 203 that switches between the MIT signal 1 and the detection signal 3 to be input to the sub-monitor circuit 217. A switch 204 that switches whether the MIT signal 2 or the detection signal 4 is to be input to the sub-monitor circuit 218. A comparison circuit 219 monitors the normality of the monitor circuit 207 by comparing the measurement value acquired from the monitor circuit 207 with the measurement value acquired from the sub-monitor circuit 217. If the acquired measurement values ​​do not match, the comparison circuit 219 outputs a monitor abnormality signal (MON FAIL signal) to the operator, indicating that the monitor circuit 207 is abnormal. A comparison circuit 220 monitors the normality of the monitor circuit 208 by comparing the measurement value acquired from the monitor circuit 208 with the measurement value acquired from the sub-monitor circuit 218. If the acquired measurement values ​​do not match, the comparison circuit 220 outputs a monitor abnormality signal (MON FAIL signal) to the operator, indicating an abnormality in the monitor circuit 208. A control circuit 209 that outputs an OFF signal to the transceiver 210 or the transceiver 211 in response to receiving an alarm signal 1 from the monitor circuit 207 or receiving an alarm signal 2 from the monitor circuit 208. Transceivers 210, 211 that output RF transmit signals. A coaxial switch 213 connects an operating transceiver (e.g., transceiver 210) to an antenna 214 based on a system switching signal. The coaxial switch 213 also connects a standby transceiver (e.g., transceiver 211) to an RF terminator 212. The coaxial switch 213 can switch between the operating side and the standby side based on the system switching signal.

[0025] For example, the DME device 200 has the configuration described above. As shown in Fig. 3, the monitor circuit 207 and the sub-monitor circuit 217 can acquire an RF monitor signal from the antenna 214 via different paths. Similarly, the monitor circuit 208 and the sub-monitor circuit 218 can acquire an RF monitor signal from the antenna 214 via different paths. Furthermore, the monitoring of the detection signal using the monitor circuits 207 and 208 and the monitoring of normality using the MIT circuits 205 and 206 may be performed using the same method as in the DME device 300. Furthermore, in the DME device 200, as in the case of the DME device 300, the control circuit 209 can output an OFF signal in response to input of an alarm signal, thereby stopping the output of signals from the transceivers 210 and 211.

[0026] Furthermore, the DME device 200 can monitor the normality of the monitor circuits 207 and 208 by, for example, the following operation. FIG. 4 shows an example of the operation of the DME device 200 when monitoring the normality of the monitor circuits 207 and 208. Referring to FIG. 4, the monitor circuit 207 monitors the detected signal 1 and outputs a measurement value of the detected signal 1 to the comparison circuit 219. Similarly, the monitor circuit 208 monitors the detected signal 2 and outputs a measurement value of the detected signal 2 to the comparison circuit 220. Furthermore, the sub-monitor circuit 217 outputs a measurement value of the detected signal 3 to the comparison circuit 219. Similarly, the sub-monitor circuit 218 outputs a measurement value of the detected signal 4 to the comparison circuit 220. In this way, the monitor circuits 207 and 208 and the sub-monitor circuits 217 and 218 measure their corresponding detected signals (step S101).

[0027] The comparison circuit 219 acquires a measurement value from the monitor circuit 207 and also acquires a measurement value from the sub-monitor circuit 217. Similarly, the comparison circuit 220 acquires a measurement value from the monitor circuit 208 and also acquires a measurement value from the sub-monitor circuit 218 (step S102). Then, the comparison circuit 219 and the comparison circuit 220 compare the acquired measurement values ​​(step S 103). For example, if the acquired measurement values ​​do not match, the comparison circuit 219 outputs a monitor abnormality signal indicating an abnormality in the monitor circuit 207 to the operator. Similarly, if the acquired measurement values ​​do not match, the comparison circuit 220 outputs a monitor abnormality signal (MON FAIL signal) indicating an abnormality in the monitor circuit 208 to the operator. In this way, if the acquired measurement values ​​do not match (step S103, NO), the comparison circuits 219 and 220 output a monitor abnormality signal indicating an abnormality in the corresponding monitor circuit (step S104).

[0028] The DME device 200, for example, operates as described above to monitor the normality of the monitor circuits 207 and 208. With this configuration, the normality of the monitor circuits 207 and 208 can be monitored while the detected signals 1 and 2 are monitored by the monitor circuits 207 and 208.

[0029] Next, an example of the operation of the DME device 200 when monitoring the normality of the sub-monitor circuits 217, 218 will be described with reference to Fig. 5. Note that the normality tests of the sub-monitor circuits 217, 218 by the MIT circuits 205, 206 can be automatically and periodically performed on each of the sub-monitor circuits 217, 218. For example, the sub-monitor circuits 217, 218 can perform either the above-mentioned measurements or monitoring by the MIT circuits 205, 206. Note that the interval between normality tests may be set arbitrarily.

[0030] For example, when a normality test of the sub-monitor circuit 217 is performed, after the switch 203 is switched, the MIT circuit 205 inputs the MIT signal 1 to the sub-monitor circuit 217 (step S201). In response to inputting the MIT signal 1 to the sub-monitor circuit 217, the MIT circuit 205 monitors the normality of the sub-monitor circuit 217 (step S202). Furthermore, when the MIT circuit 205 detects an abnormality in the sub-monitor circuit 217 (step S202, YES), the MIT circuit 205 notifies the operator of a sub-monitor abnormality signal (SUB MON FAIL signal) indicating the abnormality in the sub-monitor circuit 217 (step S203). Note that the MIT circuit 205 may detect the presence or absence of an abnormality by, for example, checking whether the sub-monitor circuit 217 is performing appropriate measurement of the MIT signal 1.

[0031] A normality test of the sub-monitor circuit 218 can be performed in a similar manner. For example, when a normality test of the sub-monitor circuit 218 is performed, after the switch 204 is switched, the MIT circuit 206 inputs the MIT signal 2 to the sub-monitor circuit 218 (step S201). In response to inputting the MIT signal 2 to the sub-monitor circuit 218, the MIT circuit 206 monitors the normality of the sub-monitor circuit 218 (step S202). Furthermore, when the MIT circuit 206 detects an abnormality in the sub-monitor circuit 218 (step S202, YES), the MIT circuit 206 notifies the operator of a sub-monitor abnormality signal (SUB MON FAIL signal) indicating an abnormality in the sub-monitor circuit 218 (step S203). Note that, like the MIT circuit 205, the MIT circuit 206 may detect the presence or absence of an abnormality by, for example, checking whether the sub-monitor circuit 218 is performing appropriate measurement of the MIT signal 1.

[0032] The above is an example of the operation of the DME device 200 when monitoring the normality of the sub-monitoring circuits 217 and 218.

[0033] In this way, DME device 200 has monitor circuits 207 and 208, sub-monitor circuits 217 and 218, and comparison circuits 219 and 220. With this configuration, DME device 200 monitors the detection signals using monitor circuits 207 and 208, and can monitor the normality of monitor circuits 207 and 208 by comparing the outputs from monitor circuits 207 and 208 with the outputs from sub-monitor circuits 217 and 218 using comparison circuits 219 and 220. As a result, DME device 200 can monitor the normality of monitor circuits 207 and 208 while monitoring field signals such as DME transmission signals.

[0034] Furthermore, the DME device 200 has MIT circuits 205 and 206. With this configuration, the MIT circuits 205 and 206 can monitor the normality of the sub-monitor circuits 217 and 218. As a result, it becomes possible to confirm that the sub-monitor circuits 217 and 218 are operating correctly, and the normality of the monitor circuits 207 and 208 can be monitored more appropriately.

[0035] 3 illustrates an example in which DME device 200 has two sets of circuits: one set consisting of monitor circuit 207, sub-monitor 217, and comparison circuit 219, and the other set consisting of monitor circuit 208, sub-monitor 218, and comparison circuit 220. However, DME device 200 may have only one set of circuits, or may have three or more sets of circuits.

[0036] Furthermore, in this disclosure, a configuration example of the DME device 200, which is a DME device, has been described as an example of a measurement device. However, the method described in this disclosure may be applied to measurement devices other than DME devices. For example, the method described in this disclosure may be applied to a tactical air navigation (TACAN) device, which is being considered as an alternative system in the event of a Global Navigation Satellite System (GNSS) failure, as well as a DME device.

[0037] [Second embodiment] Next, an example of the configuration of a measurement device 400, which is a modified example of the DME device 200 described in the first embodiment, will be described with reference to Fig. 6. Fig. 6 is a diagram showing an example of the configuration of the measurement device 400.

[0038] Measurement device 400 is a device that emits a transmission signal for position measurement into space. Fig. 6 shows an example of a characteristic configuration of measurement device 400. Referring to Fig. 6, measurement device 400 includes a monitor circuit 410, a sub-monitor circuit 420, and a comparison circuit 430.

[0039] The monitor circuit 410 monitors whether or not an abnormality occurs in the transmission signal, and can output a measurement value obtained by measuring the transmission signal to the comparison circuit.

[0040] The comparison circuit 430 receives as input the measurement values ​​measured by the monitor circuit 410 and the measurement values ​​measured by the sub-monitor circuit 420, which measures the transmission signal separately from the monitor circuit 410. The comparison circuit 430 also monitors the monitor circuit 410 by comparing the measurement values ​​received from the monitor circuit 410 with the measurement values ​​received from the sub-monitor circuit 420. For example, the comparison circuit 430 can monitor whether the monitor circuit 410 is operating correctly by comparing the measurement values ​​received from the monitor circuit 410 with the measurement values ​​received from the sub-monitor circuit 420.

[0041] As described above, the measuring device 400 includes the monitor circuit 410, the sub-monitor circuit 420, and the comparator circuit 430. With this configuration, the comparator circuit 430 can monitor the monitor circuit 410 by comparing the measurement values ​​received from the monitor circuit 410 and the sub-monitor circuit 420. As a result, the measuring device 400 can monitor the monitor circuit 410 while monitoring the transmission signal.

[0042] The measurement method performed by a device such as the measuring device 400 described above is a method in which the device such as the measuring device 400 monitors whether or not an abnormality has occurred in the transmission signal using the monitor circuit 410, accepts input of a measurement value measured by the monitor circuit 410 and a measurement value measured by a sub-monitor circuit 420 that measures the transmission signal separately from the monitor circuit 410, and monitors the monitor circuit 410 by comparing the accepted measurement values.

[0043] Furthermore, at least a portion of the configuration of the above-described measuring device 400 may be realized by, for example, reading a program stored in a storage device by an arithmetic unit such as a CPU of an information processing device such as the measuring device 400. Specifically, a program according to another embodiment of the present disclosure is a program for implementing at least a portion of processing in an information processing device such as the measuring device 400, which monitors whether an abnormality has occurred in a transmission signal using the monitor circuit 410, and receiving input of a measurement value measured by the monitor circuit 410 and a measurement value measured by a sub-monitor circuit 420 that measures the transmission signal separately from the monitor circuit 410, and comparing the received measurement values ​​to monitor the monitor circuit 410.

[0044] A program having the above-described configuration, a computer-readable recording medium having the program recorded thereon, or a measurement method can achieve the same functions and effects as the above-described measurement device 400, and therefore can achieve the above-described objective of the present disclosure.

[0045] <Additional Notes> A part or all of the above-described embodiments can be described as follows: The following provides an overview of the measurement device and other components of the present disclosure. However, the present disclosure is not limited to the following configuration.

[0046] (Appendix 1) A measurement device that radiates a transmission signal for position measurement into space, a monitor circuit for monitoring whether an abnormality occurs in the transmission signal; a comparison circuit that receives an input of a measurement value measured by the monitor circuit and a measurement value measured by a sub-monitor circuit that measures the transmission signal separately from the monitor circuit, and compares the received measurement values ​​to monitor the monitor circuit; have Measuring equipment. (Appendix 2) A normality test circuit for monitoring the normality of the sub-monitor circuit is included. 10. The measuring device according to claim 1. (Appendix 3) The comparison circuit outputs a monitor abnormality signal indicating that an abnormality has occurred in the monitor circuit when the measurement value measured by the monitor circuit and the measurement value measured by the sub-monitor circuit do not match. 10. The measuring device of claim 1 or 2. (Appendix 4) The monitor circuit and the sub-monitor circuit acquire the transmission signal via different paths from an antenna that radiates the transmission signal into space. 10. The measuring device according to claim 1, wherein the measuring device is a (Appendix 5) A switch is included which switches between the test signal used when the normality test circuit monitors normality and the transmission signal to be input to the sub-monitor circuit. 2. A measuring device as described in Appendix 2. (Appendix 6) The sub-monitor circuit performs either measurement of the transmission signal or monitoring of normality by the normality test circuit. 2. A measuring device as described in Appendix 2. (Appendix 7) When it is determined that an abnormality has occurred in the sub-monitor circuit, the normality test circuit outputs a sub-monitor abnormality signal indicating that an abnormality has occurred in the sub-monitor circuit. 2. A measuring device as described in Appendix 2. (Appendix 8) a plurality of sets each including the monitor circuit, the sub-monitor circuit, and the comparison circuit; 10. The measuring device according to any one of claims 1 to 7. (Appendix 9) A measuring device that emits a transmission signal for position measurement into space, A monitor circuit is used to monitor whether an abnormality occurs in the transmission signal, The monitor circuit is monitored by receiving input of a measurement value measured by the monitor circuit and a measurement value measured by a sub-monitor circuit that measures the transmission signal separately from the monitor circuit, and comparing the received measurement values. Measurement method. (Appendix 10) When monitoring the monitor circuit, if the measurement value measured by the monitor circuit and the measurement value measured by the sub-monitor circuit do not match, a monitor abnormality signal is output, indicating that an abnormality has occurred in the monitor circuit. Measurement method described in Appendix 9. (Appendix 11) A measuring device that emits a transmission signal for position measurement into space, A monitor circuit is used to monitor whether an abnormality occurs in the transmission signal, The monitor circuit is monitored by receiving input of a measurement value measured by the monitor circuit and a measurement value measured by a sub-monitor circuit that measures the transmission signal separately from the monitor circuit, and comparing the received measurement values. A program to realize the processing.

[0047] Note that some or all of the configurations described in Supplementary Notes 2 to 8 that are dependent on the generating device described in Supplementary Note 1 may also be dependent in a similar dependent relationship on the measurement methods described in Supplementary Notes 9 and 10, the program described in Supplementary Note 11, etc. Furthermore, not limited to Supplementary Notes 9 to 11, some or all of the configurations described as Supplements may also be dependent on various hardware, software, and various recording means, methods, or systems for recording software, within the scope of each of the above-mentioned embodiments.

[0048] The above-described program can be stored and supplied to a computer using various types of non-transitory computer-readable media. Non-transitory computer-readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (e.g., flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (e.g., magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs, CD-R / Ws, and semiconductor memories (e.g., mask ROMs, PROMs (Programmable ROMs), EPROMs (Erasable PROMs), flash ROMs, and RAMs (Random Access Memory)). The program may also be supplied to a computer by various types of transitory computer-readable media. Examples of transitory computer-readable media include electrical signals, optical signals, and electromagnetic waves. The transitory computer-readable media can supply the program to a computer via a wired communication path such as an electric wire or optical fiber, or via a wireless communication path.

[0049] Although the present disclosure has been described above with reference to the above-described embodiments, the present disclosure is not limited to the above-described embodiments. Various modifications that can be understood by those skilled in the art can be made to the configuration and details of the present disclosure within the scope of the present disclosure. Furthermore, each embodiment can be combined with other embodiments as appropriate. [Explanation of symbols]

[0050] 100 Measurement System 200 DME equipment 201, 202, 215, 216 RF detectors 203, 204 switch 205, 206 MIT circuit 207, 208 Monitor circuit 209 Control Circuit 210, 211 Transceiver 212 RF Terminator 213 Coaxial Switch 214 Antenna 217 Sub-monitor circuit 218 Sub-monitor circuit 219 Comparison circuit 220 Comparison circuit 300 DME equipment 301, 302 RF detector 303, 304 switch 305, 306 MIT circuit 307, 308 Monitor circuit 309 Control Circuit 310, 311 Transceiver 312 RF Terminator 313 Coaxial Switch 314 Antenna 400 Measuring Equipment 410 Monitor Circuit 420 Sub-monitor circuit 430 Comparison circuit

Claims

1. A measurement device that radiates a transmission signal for position measurement into space, a monitor circuit for monitoring whether an abnormality occurs in the transmission signal; a comparison circuit that receives an input of a measurement value measured by the monitor circuit and a measurement value measured by a sub-monitor circuit that measures the transmission signal separately from the monitor circuit, and monitors the monitor circuit by comparing the received measurement values; have Measuring device.

2. A normality test circuit for monitoring the normality of the sub-monitor circuit is included. The measuring device according to claim 1 .

3. The comparison circuit outputs a monitor abnormality signal indicating that an abnormality has occurred in the monitor circuit when the measurement value measured by the monitor circuit and the measurement value measured by the sub-monitor circuit do not match. The measuring device according to claim 1 .

4. The monitor circuit and the sub-monitor circuit acquire the transmission signal via different paths from an antenna that radiates the transmission signal into space. The measuring device according to claim 1 .

5. A switch is included which switches between the test signal used when the normality test circuit monitors normality and the transmission signal to be input to the sub-monitor circuit. The measuring device according to claim 2 .

6. The sub-monitor circuit performs either measurement of the transmission signal or monitoring of normality by the normality test circuit. The measuring device according to claim 2 .

7. When it is determined that an abnormality has occurred in the sub-monitor circuit, the normality test circuit outputs a sub-monitor abnormality signal indicating that an abnormality has occurred in the sub-monitor circuit. The measuring device according to claim 2 .

8. a plurality of sets each including the monitor circuit, the sub-monitor circuit, and the comparison circuit; The measuring device according to claim 1 .

9. A measuring device that emits a transmission signal for position measurement into space, A monitor circuit is used to monitor whether an abnormality occurs in the transmission signal, The monitor circuit is monitored by receiving input of a measurement value measured by the monitor circuit and a measurement value measured by a sub-monitor circuit that measures the transmission signal separately from the monitor circuit, and comparing the received measurement values. Measurement method.

10. When monitoring the monitor circuit, if the measurement value measured by the monitor circuit and the measurement value measured by the sub-monitor circuit do not match, a monitor abnormality signal is output, indicating that an abnormality has occurred in the monitor circuit. The measurement method according to claim 9.

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