Leak detection device and program

Abstract

To accurately determine left-handed IF signal leakage at various locations.SOLUTION: A leakage determination device 6 includes measured power determination means 60 that determines whether measured power is equal to or less than a first threshold and equal to or greater than a second threshold in a plurality of channels, C / N determination means 61 that determines whether a guard band of adjacent channels is noise and determines whether the C / N in a plurality of channels is equal to or greater than a third threshold, and leakage determination means 62 that determines whether a left-handed IF signal is leaking on the basis of the determination result of the measured power determination means 60 and the C / N determination means 61.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a leakage determination device that determines leakage of a left-handed IF signal and a program therefor. [Background technology]

[0002] With the start of 4K / 8K Super Hi-Vision satellite broadcasting, a new left-handed circularly polarized band has been added to the existing right-handed circularly polarized band. Satellite broadcasting is allocated radio waves in the 12 GHz band, and radio waves received by a parabolic antenna are converted to IF (Intermediate Frequency) signals. The existing right-handed circularly polarized band is frequency-converted to an IF signal of 1.0 to 2.1 GHz (right-handed IF signal) and input to the receiver. The newly added left-handed circularly polarized band is frequency-converted to an IF signal of 2.2 to 3.3 GHz (left-handed IF signal) and input to the receiver.

[0003] The 2.2 to 3.3 GHz band for frequency-converted left-handed IF signals has long been allocated to telecommunications carriers, etc. This raises concerns that leakage of left-handed IF signals due to defects in receiving equipment such as boosters could disrupt the services of telecommunications carriers, etc. For this reason, standards for preventing leakage of left-handed IF signals are set out in Article 24, Clause 30 of the Radio Equipment Regulations.

[0004] The left-handed circular polarization IF signal leaked from the receiving equipment is weak, and the modulated wave of satellite broadcasting is wideband. Even if the power of a wideband signal is measured using conventional measuring equipment, there is a limit to the measurement performance of a weak signal due to the influence of internal noise, etc. Therefore, even if conventional measuring equipment is used, it is difficult to easily determine whether the receiving equipment meets the leakage standard for left-handed circular polarization IF signals.

[0005] Therefore, in order to measure the leaked weak left-handed IF signal, a method has been proposed in which a reference IF signal obtained from a satellite broadcast receiving facility is mixed with an IF signal leaked from the receiving facility (leakage IF signal) to convert a wideband signal into a narrowband signal (Patent Documents 1 and 2). With this method, it is possible to determine whether or not the receiving facility satisfies the leakage standard for left-handed IF signals using a conventional measuring device. In addition, a method for automatically measuring the field strength of conventional broadcast signals has also been proposed (Patent Document 3). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2019-39843 A [Patent Document 2] JP 2020-101475 A [Patent Document 3] JP 2006-33173 A Summary of the Invention [Problem to be solved by the invention]

[0007] It is impossible to know in advance where and when the leakage of the left-handed IF signal occurs, and a wide-area investigation is required to find out the leakage. In order to realize a wide-area investigation, automatic measurement using an on-board device or the like is desirable, but there is a problem that it is difficult to realize with the conventional techniques described in Patent Documents 1 and 2. Specifically, in the above-mentioned conventional techniques, in order to make it possible to measure a weak left-handed IF signal, the phase of the reference IF signal and the leakage IF signal are adjusted, and a wide-band signal is converted into a narrow-band signal. In the case of automatic measurement using an on-board vehicle, the phase information changes from moment to moment, so that the phase adjustment cannot keep up, making automatic measurement difficult with the above-mentioned conventional techniques.

[0008] In addition, in outdoor automatic measurement, the distance from the leakage occurrence location to the measurement antenna is assumed to be several meters to several tens of meters. In this case, in the conventional techniques described in Patent Documents 1 and 2, the leaked left-handed IF signal becomes weak, and it is considered difficult to directly measure this left-handed IF signal.

[0009] In addition, in the conventional technology described in Patent Document 3, since other radio signals and noise exist in the bands of the right-handed IF signal and the left-handed IF signal, it is not possible to determine whether or not there is leakage of the left-handed IF signal based on the measurement results of the electric field strength alone, and this technique lacks accuracy.

[0010] Therefore, an object of the present invention is to provide a leakage determination device and a program therefor that can accurately determine leakage of left-handed IF signals in various locations. [Means for solving the problem]

[0011] In order to solve the above-mentioned problems, the leakage determination device of the present invention is a leakage determination device that receives a measured power of a right-handed IF signal and determines whether a left-handed IF signal is leaking from a receiving equipment based on the input measured power, and is configured to include a measured power determination means, a carrier-to-noise ratio determination means, and a leakage determination means.

[0012] According to this configuration, the measured power determination means determines whether or not the measured power in each of the multiple channels is equal to or less than a preset first threshold and equal to or greater than a preset second threshold that is smaller than the first threshold. The carrier-to-noise ratio determining means regards the guard band of an adjacent channel as noise, and determines whether or not the carrier-to-noise ratio of the plurality of channels is equal to or greater than a preset third threshold value. The leakage determination means determines that a left-handed IF signal is leaking when the measured power determination means determines that the measured power in multiple channels is less than a first threshold and greater than or equal to a second threshold, and when the carrier-to-noise ratio determination means determines that the carrier-to-noise ratio is greater than or equal to a third threshold.

[0013] In other words, the measured power determination means does not directly measure the leakage of a weak left-handed IF signal, but can accurately determine the leakage of the left-handed IF signal at various locations by threshold determination utilizing several characteristics of the leakage IF signal. Effect of the Invention

[0014] According to the present invention, leakage of left-handed IF signals can be accurately determined in various locations. [Brief description of the drawings]

[0015] [Figure 1] 4 is an explanatory diagram illustrating leakage power of a left-handed IF signal and a right-handed IF signal in the embodiment. FIG. [Diagram 2] FIG. 4 is an explanatory diagram for explaining leakage power from a receiving facility in the embodiment. [Diagram 3] 5 is an explanatory diagram illustrating a relationship between a leakage IF signal and noise in the embodiment. FIG. [Figure 4] 4 is an explanatory diagram illustrating a relationship between a leakage IF signal and other radio signals in the embodiment. FIG. [Diagram 5] FIG. 2 is an explanatory diagram for explaining measurement of C / N in an embodiment. [Figure 6] 1 is a schematic diagram of a leakage determination system according to an embodiment; [Figure 7] 1 is a block diagram showing a configuration of a leakage determination device according to an embodiment; [Figure 8] FIG. 11 is an explanatory diagram for explaining a map display of a leak location in the embodiment. [Figure 9] 4 is a flowchart showing an operation of the leakage determination device according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, the embodiments will be described with reference to the drawings. However, the embodiments described below are intended to embody the technical ideas of the present invention, and unless otherwise specified, the present invention is not limited to the following. In addition, the same symbols are used for the same means, and descriptions thereof may be omitted.

[0017] [Characteristics of leakage IF signal] The inventors of the present application have focused on several characteristics of the leakage IF signal and found that it is possible to accurately determine the leakage of a weak left-handed IF signal. Therefore, before describing the leakage determination system 1 (FIG. 2), these characteristics will be described.

[0018] The first characteristic of leakage IF signals is that right-handed IF signals have greater leakage power than left-handed IF signals (hereinafter referred to as "Characteristic 1"). One type of receiving equipment that is a concern due to leakage is the direct-attach type booster that was mainly sold before the start of digital broadcasting. This direct-attach type booster is compatible up to 1330MHz, and connects to the equipment by peeling off the coaxial cable and using screws or the like without using a connector.

[0019] An example of the measurement results for the power leaking from this direct-mount type booster is shown in Figure 1 (Reference 1). In Figure 1, the solid line represents the leakage power from the booster, the dashed line represents the reference value, and the dashed line represents noise. As shown in Figure 1, for left-handed IF signals in the range of 2.2 to 3.3 GHz, the leakage power only slightly exceeds the reference value. On the other hand, for right-handed IF signals in the range of 1.0 to 2.1 GHz, the leakage power is about 20 dB greater than the reference value. Therefore, whether or not the left-handed IF signal is leaking is determined by measuring the leakage power of a right-handed IF signal that is not weak, rather than measuring the leakage power of a weak left-handed IF signal.

[0020] Reference 1: Information and Communications Council, Information and Communications Technology Subcommittee, Broadcasting System Committee, Report (Draft) Document 59-2, [online], [Retrieved February 24, 2021], Internet<URL:https: / / www.soumu.go.jp / main_content / 000488640.pdf>

[0021] The second feature is that there is an upper limit to the power leaked from the receiving equipment (hereinafter, "Feature 2"). As shown in Fig. 2, the receiving equipment that generates leakage exceeding the reference value is mainly a directly attached type booster 90. Fig. 2 illustrates a booster 90 and an antenna 91 as receiving equipment, and a leakage determination system 1 described later.

[0022] There is a limit to the input / output level of the booster 90, and also to the power leakage. In Reference 1, the booster 90 is set to a rated output level, and the electric field strength E is expressed by the following formula (1). In formula (1), P t is the leakage power, d is the distance from the booster 90 to the antenna 2, V is the terminal voltage, G a is the receiving antenna gain, G b is the booster gain, L d is the free space path loss, L f is the cable propagation loss. r is the measured power, P r =V-108.8.

[0023]

number

[0024] Here, if the leakage power of the right-handed IF signal exceeds the reference value by 20 dB, it can be assumed that the leakage power of the left-handed IF signal has exceeded the reference value (see Figure 1). Also, if the leakage power of the right-handed IF signal drops significantly from the state where it is 20 dB above the reference value, it can be assumed that the leakage power of the left-handed IF signal does not exceed the reference value.

[0025] In the case of leakage of a right-handed IF signal, it is difficult to imagine that the leakage power, which exceeds the reference value by 20 dB, would become even more extremely large. If an extremely large leakage power is measured, it is believed that the cause is not the leakage IF signal but noise (Fig. 3) or other radio signals (Fig. 4). In the example of Fig. 3, the level of the field noise shown by the dashed line exceeds the level of the leakage IF signal shown by the solid line. Here, the dashed line indicates the noise of the leakage determination system 1. Also, in the example of Fig. 4, another radio signal α is mixed in, and its level exceeds the level of the leakage IF signal (solid line).

[0026] The third feature is that the leakage IF signal can be confirmed on multiple channels (e.g., BS-5ch, BS-7ch, BS-9ch, etc.) (hereinafter referred to as "Feature 3"). Even if power thought to be the leakage IF signal is measured on only one channel, it is difficult to determine that it is the leakage IF signal because other radio signals and noise exist in the band of the leakage IF signal. However, as shown in Figure 5, since the leakage IF signal occurs on multiple channels, it is possible to distinguish the leakage IF signal from other radio signals and noise by measuring the leakage power on each channel (see symbol β).

[0027] The fourth feature is that there is a guard band between channels, making it possible to measure the carrier-to-noise ratio (C / N). Even if leakage IF signals are measured on multiple channels, if the field noise is high over a wide band, it is difficult to distinguish between leakage IF signals and field noise. Therefore, as shown in Figure 5, by measuring the C / N (see symbol γ), it is possible to determine whether or not a signal is a leakage IF signal.

[0028] The leakage determination system 1 according to the first embodiment can accurately determine leakage of left-handed IF signals at various locations by threshold determination based on the above four characteristics.

[0029] [Configuration of the leak detection system] The configuration of the leakage determination system 1 will be described with reference to FIG. The leakage determination system 1 determines whether a left-handed IF signal is leaking from a booster 90 (FIG. 2). As shown in FIG. 6, the leakage determination system 1 includes an antenna 2, a booster 3, a power source 4, a measuring instrument 5, a leakage determination device 6, and a GPS (Global Positioning System) antenna 7.

[0030] In this embodiment, the leakage determination system 1 is described as being mounted on an automobile C, but is not limited thereto. For example, in addition to the automobile C, examples of transportation means on which the leakage determination system 1 can be mounted include motorcycles and drones.

[0031] The antenna 2 is a typical one for measuring the leakage power of a right-handed IF signal. For example, the antenna 2 is a Yagi antenna that receives a right-handed IF signal in the 1.2 GHz band and outputs the received signal to the booster 3. The booster 3 is a typical one that amplifies a signal input from the antenna 2. The booster 3 outputs the amplified signal to a measuring instrument 5 via a power supply 4.

[0032] The power supply 4 is a conventional one that supplies power to the booster 3 . The measuring device 5 is a general device that measures the power from the signal input from the booster 3. The measuring device 5 outputs the measured power to the leakage determination device 6.

[0033] The leakage determination device 6 receives the measured power of the right-handed IF signal from the measuring device 5, and determines whether the left-handed IF signal is leaking from the booster 90 based on the input measured power. The leakage determination device 6 then displays the position where the left-handed IF signal is leaking on a map.

[0034] The GPS antenna 7 is a typical one that receives GPS signals. The GPS antenna 7 outputs the received GPS signals to the leak determination device 6. In this embodiment, the leakage determination system 1 is described as using a GPS signal, but is not limited to this. For example, the leakage determination system 1 may use a Global Navigation Satellite System (GNSS) such as GLONASS, Galileo, or a quasi-zenith satellite.

[0035] [Configuration of the leak detection device] The configuration of the leakage determination device 6 will be described with reference to FIG. As shown in FIG. 7, the leakage determination device 6 includes a measured power determination means 60, a C / N determination means (carrier-to-noise ratio determination means) 61, a leakage determination means 62, a position measurement means 63, a leakage position output means 64, and a display 65.

[0036] The measured power determination means 60 determines whether or not the measured power input from the measuring device 5 in a plurality of channels is equal to or less than a first threshold value set in advance and equal to or greater than a second threshold value set in advance and smaller than the first threshold value. The measured power determination means 60 then outputs the determination result to the leakage determination means 62. The setting of the first and second threshold values ​​will be described in detail later.

[0037] The C / N determination means 61 regards the guard band of an adjacent channel as noise and determines whether the C / N of a plurality of channels is equal to or greater than a preset third threshold. In this embodiment, the C / N determination means 61 determines the C / N using the measured power input from the measuring instrument 5. This third threshold may be set manually based on experience (for example, 9 dB). The C / N determination means 61 then outputs the determination result to the leakage determination means 62.

[0038] The leakage determination means 62 determines that the left-handed IF signal is leaking when the measured power determination means 60 determines that the measured power is equal to or less than the first threshold value and equal to or more than the second threshold value in a plurality of channels, and the C / N determination means 61 determines that the C / N is equal to or more than the third threshold value. In other words, the leakage determination means 62 determines whether or not the left-handed IF signal is leaking based on the determination results input from both the measured power determination means 60 and the C / N determination means 61. The leakage determination means 62 then outputs the determination result to the leakage position output means 64.

[0039] The position measuring means 63 measures the measurement position of the right-handed IF signal by using the GPS signal input from the GPS antenna 7. That is, like a general GPS receiver, the position measuring means 63 converts the GPS signal from the GPS antenna 7 into position information of the leak determination device 6. Then, the position measuring means 63 outputs the position information indicating the measurement position of the right-handed IF signal to the leakage position output means 64.

[0040] The leakage position output means 64 receives position information from the position measurement means 63, and outputs the input position information in association with the determination result of the leakage determination means. In this embodiment, the leakage position output means 64 displays the position determined by the leakage determination means 62 that the left-handed IF signal is leaking on the display 65, as shown in Fig. 8. In the example of Fig. 8, the leakage position output means 64 plots a marker M of the position where the left-handed IF signal is leaking on a map.

[0041] The method of outputting the position where the left-handed IF signal is leaking is not particularly limited. For example, the leakage position output means 64 may output the position where the left-handed IF signal is leaking to a file or a printer, or may transmit the position as data.

[0042] As a result, the leakage determining device 6 can accurately determine leakage of the left-handed IF signal from the booster 90 within a range of, for example, about 30 meters.

[0043] <Setting the first and second thresholds> The setting of the first threshold and the second threshold will be described below. The first threshold is a threshold for determining whether the signal is not noise or another radio signal. The distance between the indoor booster 90 that leaks the left-handed IF signal and the leakage determination device 6 mounted on the vehicle is assumed to be at least 5 meters. In this case, the power of the leaked right-handed IF signal is at most +20 dB higher than the reference value (Reference 1). Therefore, the power of the leaked right-handed IF signal is at most -29.1 dBm. When this maximum power is received at a location 5 meters away, the electric field strength E at that location is 61.7 dBμV / m according to formula (7). In other words, the electric field strength E of the leaked right-handed IF signal does not exceed this maximum value, and if an electric field strength E equal to or greater than this maximum value is measured, it is considered not to be a leaked IF signal.

[0044] As shown in the above formula (7), the electric field strength E is expressed as the measurement power P r When converting to antenna gain G a , booster gain G b and cable propagation loss L f Therefore, the measured power P r The maximum value of is not uniquely determined. For example, if the maximum value of the electric field strength E is 61.7 dBμV / m, the measured power P r The maximum value of the measured power P at the distance from the booster 90 to the leakage determination device 6 is −29.3 dBm (79.5 dBμV). r The value may be set based on the maximum value of 79.5 dBμV, for example.

[0045] The second threshold is a threshold for determining whether the power is equal to or higher than the noise level, and is smaller than the first threshold. The farther the distance between the booster 90 and the on-board leakage determination device 6, the lower the measured power. For example, when receiving at a distance of 40 meters, the measured power at that point is at a level almost the same as noise, such as -47.4 dBm (61.4 dBμV), which indicates that it is impossible to determine whether the measured power is leakage from the booster 90 or noise. In other words, an accurate determination can be made by determining that anything below this value is noise and anything above this value is leakage of the right-handed IF signal. Therefore, the second threshold may be set based on the noise level at the distance from the booster 90 to the leakage determination device 6, and may be, for example, 61.4 dBμV.

[0046] [Operation of the leak detection device] The operation of the leakage determination device 6 will be described with reference to FIG. As shown in FIG. 9, in step S1, the leakage determining device 6 receives an input of the measured power of the right-handed IF signal from the measuring device 5.

[0047] In step S2, the measured power determination means 60 determines whether the measured power of each channel to be measured (e.g., BS-5ch, BS-7ch, BS-9ch, ...) is equal to or less than the first threshold value. In other words, the measured power determination means 60 determines whether the measured power is a leakage of a right-handed IF signal, noise, or another radio signal.

[0048] If the measured power is equal to or less than the first threshold value (Yes in step S2), the measured power determination means 60 determines that there is leakage of a right-handed IF signal, and proceeds to the process of step S3. If the measured power exceeds the first threshold value (No in step S2), the measured power determination means 60 determines that the signal is noise or another wireless signal, and proceeds to the process of step S8.

[0049] In step S3, the measured power determination means 60 determines whether the measured power of each channel to be measured is equal to or greater than the second threshold. In other words, the measured power determination means 60 determines whether the measured power is noise. Note that the processes in steps S2 and S3 correspond to the above-mentioned features 1 and 2.

[0050] If the measured power is equal to or greater than the second threshold value (Yes in step S3), the measured power determination means 60 determines that it is not noise, and proceeds to the process of step S4. If the measured power is less than the second threshold value (No in step S3), the measured power determination means 60 determines it to be noise, and proceeds to the process of step S8.

[0051] In step S4, the measured power determination means 60 determines whether or not both steps S2 and S3 are Yes for the multiple channels to be determined. The process in step S4 corresponds to the above-mentioned feature 3.

[0052] Here, the number of channels to be judged in step S4 is not particularly limited as long as it is a plurality of channels. For example, all channels may be judged, adjacent channels may be judged, or any number of channels equal to or greater than two may be judged.

[0053] If the results of both steps S2 and S3 are Yes for multiple channels (Yes in step S4), the measured power determination means 60 proceeds to the process of step S5. If at least one of step S2 and step S3 is No for a plurality of channels (No in step S4), the measured power determination means 60 proceeds to the process of step S8.

[0054] In step S5, the C / N determination means 61 regards the guard band of adjacent channels as noise, and determines whether the C / N of multiple channels is equal to or greater than the third threshold. For example, the C / N determination means 61 regards the frequency at the boundary between adjacent BS-5ch and BS-7ch as noise, and the adjacent BS-5ch and BS-7ch as carriers to obtain the C / N of each channel, and determines whether the C / N is equal to or greater than the third threshold. The process of step S5 corresponds to the above-mentioned feature 4.

[0055] If the C / N ratio is equal to or greater than the third threshold value in all of the channels to be determined (Yes in step S5), the C / N determination means 61 determines that the noise is not field noise, and the process proceeds to step S6. If the C / N is less than the third threshold value in any one of the channels to be judged (Yes in step S5), the C / N judging means 61 judges it to be field noise, and proceeds to the process of step S8.

[0056] Here, when the process of step S6 is reached, it can be said that the measured power determination means 60 has determined that the measured power is equal to or less than the first threshold value and equal to or more than the second threshold value in a plurality of channels, and that the C / N determination means 61 has determined that the C / N is equal to or more than the third threshold value. In other words, when the process of step S6 is reached, it can be said that all the determination results of steps S2 to S5 are Yes. Therefore, in step S6, the leakage determination means 62 determines that the left-handed IF signal is leaking, and proceeds to the process of step S7.

[0057] In step S7, the position measurement means 63 measures the measurement position of the right-handed IF signal by using the GPS signal input from the GPS antenna 7. Then, the leakage position output means 64 displays on the display 65 the position determined in step S6 to be where the left-handed IF signal is leaking, and ends the process.

[0058] Here, if the process reaches step S8, it can be said that the measured power determination means 60 has determined that the measured power in any channel is equal to or less than the first threshold value and not equal to or more than the second threshold value, or the C / N determination means 61 has determined that the C / N is not equal to or more than the third threshold value. In other words, if the process reaches step S8, it can be said that the determination result in any of steps S2 to S5 was No. Therefore, in step S8, the leakage determination means 62 determines that the left-handed IF signal is not leaking, and ends the process.

[0059] [Actions and Effects] As described above, the leakage determination device 6 of the embodiment does not directly measure the leakage of a weak left-handed IF signal, but can determine the leakage of a left-handed IF signal at various locations from the measured power of the right-handed IF signal by threshold processing that utilizes characteristics 1 to 4 of the leakage IF signal.

[0060] That is, if the receiving equipment does not support the left-handed IF band (for example, if the receiving equipment is old), the left-handed radio waves of the satellite broadcasting are not received, and the measured power of the leaked right-handed IF signal does not exceed the reference value for the left-handed IF signal. For example, if a parabolic antenna for receiving satellite broadcasting breaks down due to aging or the like, and only the parabolic antenna is made compatible with the left-handed IF signal, the possibility of exceeding the reference value for the left-handed IF signal increases. Note that most parabolic antennas currently on the market are compatible with the left-handed IF signal. Therefore, the leakage determination device 6 can accurately determine the receiving equipment that may "exceed the reference value for the left-handed IF signal" in the future. As a result, leakage prevention measures such as equipment replacement can be implemented in advance for such receiving equipment, and leakage of the left-handed IF signal can be prevented in advance.

[0061] (Modification) Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and includes design modifications and the like within the scope of the present invention. In the above embodiment, it has been described that a left-handed IF signal leaks from the booster, but the receiving equipment that is the subject of measurement of the leaked IF signal is not limited to this.

[0062] In the above embodiment, the leakage determination device is described as an independent hardware, but the present invention is not limited to this. For example, the present invention can be realized by a moving object tracking program that operates hardware resources such as a CPU, memory, and hard disk of a computer as the leakage determination device. These programs may be distributed via a communication line, or may be written and distributed on a recording medium such as a CD-ROM or a flash memory. [Explanation of symbols]

[0063] 1. Leak detection system 2 Antennas 3 Booster 4 Power supply 5 Measuring instruments 6. Leak detection device 7 GPS antenna 60 Measured power determination means 61 C / N determination means (carrier-to-noise ratio determination means) 62 Leakage determination method 63 Position measurement means 64 Leak location output means 65 Display

Claims

1. A leakage determination device that receives a measured power of a right-handed IF signal and determines whether a left-handed IF signal is leaking from a receiving facility based on the measured power, comprising: a measured power determination means for determining whether the measured power is equal to or less than a first threshold value and equal to or more than a second threshold value that is smaller than the first threshold value and is preset, for a plurality of channels; a carrier-to-noise ratio determination means for determining whether a carrier-to-noise ratio in the plurality of channels is equal to or greater than a third threshold value that is set in advance; leakage determination means for determining that the left-handed IF signal is leaking when the measured power determination means determines that the measured power is equal to or less than the first threshold and equal to or more than the second threshold in the plurality of channels and the carrier-to-noise ratio determination means determines that the carrier-to-noise ratio is equal to or more than the third threshold; A leakage determination device comprising:

2. a leakage position output means for receiving position information indicating a measurement position of the right-handed IF signal and outputting the input position information in association with a determination result of the leakage determination means; The leakage determination device according to claim 1 , further comprising:

3. the first threshold is preset based on a maximum value of the measured power in a distance from the receiving facility to the leakage determination device, 3. The leakage determination device according to claim 1, wherein the second threshold value is preset based on a noise level at a distance from the receiving facility to the leakage determination device.

4. 4. The leakage determination device according to claim 1, which is mounted on a moving means.

5. A program for causing a computer to function as the leakage determination device according to any one of claims 1 to 4.

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