KR20170040561A - Apparatus for analysing gnss interference and method thereof - Google Patents

Apparatus for analysing gnss interference and method thereof Download PDF

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Publication number
KR20170040561A
KR20170040561A KR1020150139695A KR20150139695A KR20170040561A KR 20170040561 A KR20170040561 A KR 20170040561A KR 1020150139695 A KR1020150139695 A KR 1020150139695A KR 20150139695 A KR20150139695 A KR 20150139695A KR 20170040561 A KR20170040561 A KR 20170040561A
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South Korea
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gnss
radio wave
interference
propagation
navigation receiver
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KR1020150139695A
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Korean (ko)
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KR102056698B1 (en
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주인원
신천식
김재훈
정성균
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한국전자통신연구원
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/015—Arrangements for jamming, spoofing or other methods of denial of service of such systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/20—Integrity monitoring, fault detection or fault isolation of space segment
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Security & Cryptography (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

An apparatus for analyzing GNSS radio wave interference and a method are disclosed. The apparatus for analyzing GNSS radio wave interference according to the present invention includes a step of displaying GNSS radio wave interference source information and GNSS navigation receiver information on a map; a step of receiving a radio wave prediction model of a GNSS radio wave interference frequency corresponding to the terrain of a place where a navigation receiver is located and the arrangement environment of the artificial structure; a step of calculating a GNSS radio wave interference intensity according to the position on the map and the radio wave interference value of the GNSS navigation receiver by using the selected radio wave prediction model; and a step of displaying the calculated GNSS radio wave interference intensity and the radio wave interference impact value of the GNSS navigation receiver on the map. So, it is possible to analyze the malfunction and damage of the GNSS navigation receiver.

Description

[0001] APPARATUS FOR ANALYZING GNSS INTERFERENCE AND METHOD THEREOF [0002]

The present invention relates to an apparatus and method for analyzing GNSS radio waves, and more particularly, to a technique for analyzing interference effects of GNSS navigation receivers in the GNSS navigation frequency band and predicting the range of damage.

GNSS (Global Navigation Satellite System) is a satellite navigation system that can provide location and visual services at any time in any region of the world using dozens of satellites. . Currently, GNSS is used not only in military applications such as missile guidance, but also in navigation, mapping, and geodesy of aircraft, ships and automobiles. Especially, it has become an indispensable system not only for the nation but also for the life of the general public.

US GPS, GLONASS in Russia, Galileo in Europe, Beidou in China, and QZSS in Japan are typical GNSS systems, and GPS and GLONASS are operating normally and are actively providing service. And develop and build a local satellite navigation system covering its own region in India and Japan.

GNSS calculates the distance information using the time signal transmitted from at least four satellites observed from the ground and estimates the difference between the three-dimensional coordinates (X, Y, Z) and GPS time of the terrestrial receiver do.

These GNSSs can cause various errors such as orbit and satellite clock errors, ionospheric delay, tropospheric delay, multipath and jamming. In addition, errors may occur due to radio interference that intentionally or unintentionally interferes with the reception of GPS signals to navigation facilities utilizing GNSS.

The GNSS satellite navigation signal uses very low signal power, uses a single frequency for civil use, and the structure of the satellite navigation system is open to the public, making it easy to construct a radio wave receiver, which is vulnerable to radio wave interference. It is also vulnerable to external signals in that the global military weapon system relies on GNSS satellite navigation signals.

In the type of radio wave interference, jamming, which is the act of making the signal of the intensity signal stronger than the GNSS signal to the GNSS signal band or the adjacent band, disables the navigation service, generates the simulated navigation signal in the same manner as the GNSS navigation signal, It is a type that causes a position information error by transmitting with higher signal strength than a navigation signal. It is a kind of GNSS hacking, which is a spoofing and GNSS navigation signal. Meaconing and so on.

If such radio wave interference occurs, errors in the provision of various wireless communication services may occur, and time synchronization and misoperation related to the position information may occur in the IT related products. Therefore, there is an urgent need for a radio interference analysis technique capable of calculating the intensity of a radio wave interference signal and analyzing the malfunctions and damage effects of receivers receiving GNSS navigation signals.

Korean Patent No. 10-0673201, January 22, 2007 Announcement (Name: Radio Wave Environment Analysis System and Method)

An object of the present invention is to analyze the malfunction and damage influence of GNSS navigation receivers by calculating the intensity of a radio wave source by applying an actual or a simulated GNSS radio signal source to a propagation prediction model considering the environment of the terrain and artificial structure.

It also minimizes the damage caused by radio wave interference by predicting the malfunction of the GNSS navigation receiver and providing an analysis function to minimize the influence of radio interference.

Also, in order to prevent malfunction of the GNSS navigation receiver, it is necessary to calculate the placement position and recommended size of the artificial structure to be installed around the GNSS navigation receiver, and to prevent damage due to radio wave interference by installing the artificial structure.

According to an aspect of the present invention, there is provided a method for analyzing a GNSS radio wave, comprising: displaying on a map a GNSS radio wave interference source information and a GNSS navigation receiver information; Receiving a propagation prediction model of a GNSS propagation interference frequency corresponding to a terrain of a place where the navigation receiver is located and an arrangement environment of the artificial structure; Calculating a GNSS propagation environment intensity according to the location on the map and a radio interference effect value of the GNSS navigation receiver using the selected radio propagation prediction model; And displaying the calculated GNSS propagation interference intensity and the propagation path interference value of the GNSS navigation receiver on the map.

At this time, the radio wave source information can be received from the GNSS source monitoring system or received from the user.

At this time, the propagation prediction model of the GNSS propagation path interference frequency may be a propagation prediction model of a point-to-point point or a propagation prediction model of a point-to-point region.

The method may further include calculating a recommended size and a recommended installation location of the artificial structure to be installed in order to avoid radio wave interference when the GNSS navigation receiver has a radio wave interference value greater than or equal to a threshold value.

In this case, if the GNSS navigation receiver and the GNSS radio wave interference source are in a visible range (LOS) environment, a man-made structure is disposed around the GNSS navigation receiver to estimate the GNSS propagation intensity and the interference value of the GNSS navigation receiver And a step of calculating the number of steps.

Also, a GNSS radio wave interference analyzing apparatus according to an embodiment of the present invention includes: a display unit for displaying GNSS radio wave interference information and GNSS navigation receiver information on a map; A radio wave propagation prediction model selecting unit for selecting a propagation prediction model of a GNSS radio wave interference frequency corresponding to the terrain of the place where the navigation receiver is located and the arrangement environment of the artificial structure; And a calculator for calculating a GNSS propagation intensity intensity according to the location on the map and a radio interference effect value of the GNSS navigation receiver using the selected radio wave prediction model, The radio interference effect value of the GNSS navigation receiver is displayed on the map.

At this time, the radio wave source information can be received from the GNSS source monitoring system or received from the user.

At this time, the propagation prediction model of the GNSS propagation spectrum frequency may be a propagation prediction model of a point-to-point or a propagation prediction model of a point-to-point region.

At this time, when the influence of the radio wave interference of the GNSS navigation receiver is greater than or equal to the threshold value, the calculating unit may calculate a recommended specification and a recommended installation position of the artificial structure to be installed in order to avoid radio wave interference.

In this case, when the GNSS navigation receiver and the GNSS radio wave interference source are in a visible range (LOS) environment, the calculation unit arranges artificial structures around the GNSS navigation receiver to detect the GNSS propagation intensity and the radio frequency interference The influence value can be calculated.

According to the present invention, the actual or simulated GNSS propagation signal source can be applied to a propagation prediction model that takes into account the environment of the terrain and man-made structure to calculate the strength of the propagation source, thereby analyzing the malfunctions and damage effects of the GNSS navigation receivers .

In addition, it is possible to predict the malfunction of the GNSS navigation receiver in advance, and to provide an analysis function to minimize the influence of the radio wave interference, thereby minimizing the damage caused by radio wave interference.

Also, in order to prevent malfunction of the GNSS navigation receiver, it is possible to calculate the placement position and the recommended size of the artificial structure to be installed around the GNSS navigation receiver, and to prevent damage due to radio wave interference by installing the artificial structure.

1 is a diagram illustrating a GNSS system to which a GNSS radio wave interference analysis method according to an embodiment of the present invention is applied.
2 is a block diagram showing a GNSS radio wave interference analyzing apparatus according to an embodiment of the present invention.
3 is a flowchart illustrating a method of analyzing a GNSS radio wave interference according to an embodiment of the present invention.
FIG. 4 is an exemplary diagram showing the analysis result displayed in step S350 of FIG.

The present invention will now be described in detail with reference to the accompanying drawings. Hereinafter, a repeated description, a known function that may obscure the gist of the present invention, and a detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a GNSS system to which a GNSS radio wave interference analysis method according to an embodiment of the present invention is applied.

1, the GNSS system includes one or more GNSS navigation receivers 10a, 10b, and 10c, a GNSS radio frequency duplexer 20 that interferes with the reception of radio signals from the GNSS navigation receivers 10a, 10b, and 10c, A monitoring system 100 and a GNSS radio wave interference analyzing apparatus 200. [

First, the GNSS navigation receiver 10a, 10b, 10c receives the GNSS satellite signal from the satellite, acquires and tracks the navigation signal, and calculates the navigation solution. The GNSS navigation receiver (10a, 10b, 10c) is a device necessary for a user on the ground to navigate using a GNSS satellite signal.

And the GNSS propagation source 20 is a device that intentionally or unintentionally interferes with the GNSS signal reception of the GNSS navigation receivers 10a, 10b, 10c receiving the GNSS propagation signals.

The GNSS propagation source 20 may unintentionally cause interference due to radio frequency interference, GNSS testing by the operator, ionospheric changes due to solar storms, and use spectrum competition. In addition, the GNSS propagation path source 20 may generate illegal propagation that deliberately causes interference, such as jamming and smart jamming.

Next, the GNSS interference monitoring system 100 detects the interference of the radio wave and measures the radio frequency interference intensity when the interference occurs. That is, the GNSS source monitoring system 100 detects GNSS source information including at least one of the location, the frequency, and the intensity of the GNSS propagation source 20, and transmits the detected source information to the GNSS radio wave interference analyzer (200).

At this time, the GNSS source monitoring system 100 is a satellite radio monitoring center (SRMC) that investigates and measures illegal sources originating in the domestic satellite communication network, or a central radio station that detects radio waves and monitors radio waves (CRMO, Central Radio Management Office).

The GNSS source monitoring apparatus 100 can monitor the geostationary satellite radio wave between the set monitoring range (e.g., from 55 [deg.] To 160 [deg.] East) and probe the interference of the satellite network. At this time, the GNSS source monitoring apparatus 100 can measure information such as the position of the geostationary satellite, the transmission characteristics of the satellite radio waves, and the frequency utilization rate. If it is determined that the GNSS propagation path source 20 exists, the GNSS source monitoring apparatus 100 may transmit the GNSS propagation path source information to the GNSS propagation path interference analyzing apparatus 200 .

Finally, the GNSS radio wave interference analyzer 200 calculates the strength of the radio wave interference signal by applying the information of the GNSS navigation receivers 10a, 10b, 10c and the GNSS radio frequency signal source 20 to the propagation prediction model, (10a, 10b, 10c), and analyzes the influence of damage caused by radio wave interference.

In addition, the GNSS radio wave interference analyzing apparatus 200 can calculate a placement position and a recommended size of an artificial structure to be installed in order to prevent a malfunction of the GNSS navigation receiver 10a, 10b, 10c according to a GNSS radio wave interference situation.

2 is a block diagram showing a GNSS radio wave interference analyzing apparatus according to an embodiment of the present invention.

2, the GNSS electric wave interference analyzer 200 includes an input unit 210, a display unit 220, a propagation prediction model selection unit 230, and a calculation unit 240.

The input unit 210 receives the GNSS radio wave interference source information from the GNSS interference source monitoring system 100. When the user uses the GNSS radio wave interference analyzing apparatus 200 according to the embodiment of the present invention for simple simulation analysis, the input unit 210 can receive an arbitrary set value from the user as the GNSS radio interference source information.

Also, the input unit 210 receives the GNSS navigation receiver information from the user. Here, the GNSS navigation receiver information may be a value measured by performing a step-by-step characteristic test of the signal processing using various GNSS interference sources in a laboratory environment in advance, and may include a position of the GNSS navigation receiver, have.

Next, the display unit 220 displays the GNSS radio wave interference information and the GNSS navigation receiver information received by the input unit 210 on the map. In this case, the map may be a map based on the terrain and the altitude information database of the building. When the addition of the artificial structure or the change of the terrain is input from the user, the display unit 220 displays, on the map reflecting the changed terrain and building information, The original information and GNSS navigation receiver information can be displayed.

The propagation prediction model selection unit 230 selects a propagation prediction model of the GNSS radio frequency interference frequency corresponding to the terrain of the place where the GNSS navigation receiver is located and the arrangement environment of the artificial structure. At this time, the propagation prediction model selection unit 230 may select the propagation prediction model of the GNSS propagation spectrum interference frequency from the user or the propagation prediction model selection unit 230 may select the propagation prediction model with a predetermined algorithm.

Finally, the calculator 240 calculates the GNSS propagation intensity and the interference value of the GNSS navigation receiver according to the location on the map using the selected propagation prediction model. At this time, the calculating unit 240 may set the GNSS propagation path interference region and calculate the propagation path interference value of the GNSS navigation receiver. Here, the GNSS propagation path interference region can be set by the GNSS propagation intensity or the separation distance of the concentric circle from the GNSS propagation source.

The calculated GNSS propagation intensity and the interference value of the GNSS navigation receiver are displayed on the map through the display unit 220.

Hereinafter, a GNSS radio wave interference analysis method according to an embodiment of the present invention will be described in more detail with reference to FIG. 3 and FIG.

FIG. 3 is a flowchart illustrating a method of analyzing a GNSS radio wave interference according to an exemplary embodiment of the present invention, and FIG. 4 is a diagram illustrating an analysis result displayed in step S350 of FIG.

First, the GNSS radio wave interference analyzer 200 displays the GNSS propagation path source information and the GNSS navigation receiver information on a map (S310).

Here, the GNSS propagation path information is received from a GNSS source monitoring system 100 such as a satellite radio monitoring center (SRMC) or a central radio station (CRMO), or received arbitrarily from a user. The location of the source, the GNSS interference frequency, and the intensity of the GNSS interference.

In addition, the GNSS navigation receiver information is a value measured by applying various GNSS sources in a laboratory environment to the signal processing step-by-step characteristic tests. The GNSS tuner 200 determines the position of the GNSS navigation receiver, The GNSS navigation receiver information including at least one of the GNSS navigation receiver information may be set.

The GNSS radio wave interference analyzer 200 displays the GNSS radio wave interference information and the GNSS navigation receiver information received from the GNSS source monitoring system 100 or received from the user on the map. Here, the map may be a map based on the terrain and the building's altitude information database, and may be a LOS (Line Of Sight) environment if the map does not provide terrain and elevation information of the building.

Also, the GNSS radio wave interference analyzing apparatus 200 can additionally set terrain or building information from the user. Particularly, when the GNSS radio wave interference source 10 and the GNSS navigation receivers 10a, 10b and 10c are LOS (visible range) environments, a man-made structure is added in front of the GNSS navigation receivers 10a, 10b, Invisible distance) environment can be created to analyze the GNSS propagation intensity and the propagation interference value of the GNSS navigation receiver.

Next, the GNSS radio wave interference analyzing apparatus 200 selects a propagation prediction model of the GNSS radio frequency interference frequency (S320).

The GNSS radio wave interference analyzing apparatus 200 can select from among a plurality of radio wave propagation prediction models stored in the propagation prediction model database, and the GNSS radio wave interference analyzing apparatus 200 corresponds to the terrain of the place where the GNSS navigation receiver is located and the arrangement environment of the artificial structure So that the propagation prediction model of the GNSS propagation interference frequency can be selected. Here, the propagation prediction model may be a propagation prediction model of a point-to-point or point-to-point region.

At this time, the GNSS electric wave interference analyzer 200 may select a propagation prediction model from a user, or the propagation prediction model selection unit 230 may select a propagation prediction model with a predetermined algorithm.

Then, the GNSS radio wave interference analyzer 200 calculates the GNSS propagation path interference intensity (S330).

The GNSS radio wave interference analyzing apparatus 200 analyzes the intrinsic parameters of the selected propagation prediction model and the position of the GNSS navigation receiver and the GNSS radio wave interference receiver and the GNSS radio wave interference receiver displayed or set on the map in step S310, And the altitude information of the building present in the GNSS is used to calculate the GNSS propagation intensity according to the location on the map.

In addition, the GNSS radio wave interference analyzer 200 calculates a radio frequency interference value of the GNSS navigation receiver (S340).

The propagation path interference value of the GNSS navigation receiver means the degree to which the GNSS navigation receiver is influenced by the GNSS propagation path strength and the GNSS propagation path interference analyzer 200 uses the propagation path interference value to calculate the operation state of the GNSS navigation receiver It can be judged. The GNSS radio wave interference device 200 can determine that the corresponding GNSS navigation receiver is in a malfunction state when the radio interference effect value of the GNSS navigation receiver is equal to or greater than the threshold value.

At this time, the GNSS radio wave interference analyzer 200 can set the GNSS propagation path interference region to calculate the propagation path interference value of the GNSS navigation receiver. The GNSS radio frequency interference area may be set using the GNSS propagation intensity calculated in step S330, or may be set by the distance of the concentric circle from the GNSS propagation source.

Finally, the GNSS radio wave interference analyzer 200 displays the GNSS propagation path interference intensity and the propagation path interference value on the map (S350).

The GNSS radio wave interference analyzer 200 displays the GNSS propagation path information and the GNSS navigation receiver information on the map in step S310 for convenience of explanation. However, the present invention is not limited to this, Internally, sets the GNSS propagation path information and the GNSS navigation receiver information, and displays only the step S350 and provides it to the user.

As shown in FIG. 4, the GNSS radio wave interference analyzing apparatus 200 may display a color set differently according to the GNSS propagation path intensity, so that the user can intuitively grasp the GNSS propagation path intensity. Then, the GNSS radio wave interference analyzer 200 may set the color of each GNSS navigation receiver to a color corresponding to the radio frequency interference value.

For convenience of explanation, the GNSS radio frequency interference analyzer 200 has used the color to indicate on the map the GNSS propagation intensity and the radio interference effect value of the GNSS navigation receiver. However, the present invention is not limited to this, The GNSS propagation intensity and the interference value of the GNSS navigation receiver can be displayed and provided to the user.

Also, the GNSS radio wave interference analyzing apparatus 200 can calculate and display the wave angle of the GNSS radio wave source based on the GNSS navigation receiver on the map.

If it is determined in step S340 that the GNSS navigation receiver is malfunctioning as a result of calculating the propagation path interference value of the GNSS navigation receiver, the GNSS propagation path interference analyzer 200 receives the information of the artificial structure from the user, The artificial structure can be installed on the map by calculating the information of the artificial structure to be installed using the predetermined algorithm.

In this case, the artificial structure is installed around the GNSS navigation receiver to artificially create a non-LOS environment in order to prevent malfunction of the GNSS navigation receiver, and the information of the artificial structure may include the position information of the artificial structure and the recommended standard information have.

The GNSS radio wave interference analyzing apparatus 200 according to the embodiment of the present invention analyzes the indirect influence of the GNSS navigation receiver under various GNSS propagation conditions through simulation of installing artificial structures on a map or changing information of installed artificial structures , And the range of damage due to the GNSS radio wave interference can be predicted.

As described above, the GNSS radio wave interference analyzing apparatus and method according to the present invention are not limited to the configuration and method of the embodiments described above, but the embodiments can be applied to various embodiments All or a part of the above-described elements may be selectively combined.

10a, 10b, 10c: GNSS navigation receiver
20: GNSS propagation source
100: GNSS interference monitoring system
200: GNSS radio wave interference analyzer
210:
220:
230: propagation prediction model selection unit
240:

Claims (1)

Displaying GNSS propagation source information and GNSS navigation receiver information on a map;
Receiving a propagation prediction model of a GNSS propagation interference frequency corresponding to a terrain of a place where the navigation receiver is located and an arrangement environment of the artificial structure;
Calculating a GNSS propagation environment intensity according to the location on the map and a radio interference effect value of the GNSS navigation receiver using the selected radio propagation prediction model; And
And displaying on the map the calculated GNSS propagation loss intensity and the propagation loss impact value of the GNSS navigation receiver.
KR1020150139695A 2015-10-05 2015-10-05 Apparatus for analysing gnss interference and method thereof KR102056698B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102013208B1 (en) 2018-08-20 2019-08-22 한화시스템 주식회사 Jamming signal output method
KR102013207B1 (en) 2018-08-20 2019-08-22 한화시스템 주식회사 Jamming signal output device
CN113329412A (en) * 2021-05-28 2021-08-31 怀化学院 High-throughput UAV position selection system and computer storage medium

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100673201B1 (en) 2004-12-27 2007-01-22 에스케이 텔레콤주식회사 System and Method for simulation of Radio Wave Propagation

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100673201B1 (en) 2004-12-27 2007-01-22 에스케이 텔레콤주식회사 System and Method for simulation of Radio Wave Propagation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102013208B1 (en) 2018-08-20 2019-08-22 한화시스템 주식회사 Jamming signal output method
KR102013207B1 (en) 2018-08-20 2019-08-22 한화시스템 주식회사 Jamming signal output device
CN113329412A (en) * 2021-05-28 2021-08-31 怀化学院 High-throughput UAV position selection system and computer storage medium
CN113329412B (en) * 2021-05-28 2022-06-07 怀化学院 High-throughput UAV position selection system and computer storage medium

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