CN111669249B - Cellular network electromagnetic interference method and system based on environment recognition - Google Patents
Cellular network electromagnetic interference method and system based on environment recognition Download PDFInfo
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- CN111669249B CN111669249B CN202010654668.3A CN202010654668A CN111669249B CN 111669249 B CN111669249 B CN 111669249B CN 202010654668 A CN202010654668 A CN 202010654668A CN 111669249 B CN111669249 B CN 111669249B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/60—Jamming involving special techniques
- H04K3/62—Jamming involving special techniques by exposing communication, processing or storing systems to electromagnetic wave radiation, e.g. causing disturbance, disruption or damage of electronic circuits, or causing external injection of faults in the information
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/30—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array
- H01Q3/34—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array by electrical means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K2203/00—Jamming of communication; Countermeasures
- H04K2203/30—Jamming or countermeasure characterized by the infrastructure components
- H04K2203/32—Jamming or countermeasure characterized by the infrastructure components including a particular configuration of antennas
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Abstract
The invention relates to a cellular network electromagnetic interference method and a cellular network electromagnetic interference system based on environment identification. The method comprises the following steps: acquiring a detection signal of a region to be shielded and a base station signal of the region to be shielded in a signal detection time slot; determining the space size coordinate of the region to be shielded according to the parameters of the detection signals; determining the signal intensity of a base station in a region to be shielded by using a signal attenuation model according to the base station signal; determining electromagnetic interference parameters of the area to be shielded based on a beam forming principle and a signal attenuation model according to the space size coordinate of the area to be shielded and the signal intensity of the base station; the electromagnetic interference parameters comprise electromagnetic interference power and antenna waveform; adjusting an antenna array of an interference system according to the electromagnetic interference parameters to generate an interference signal of a region to be shielded; and the interference signal is sent to the area to be shielded in the interference signal sending time slot. The invention can realize directional shielding on signals in a shielding region and reduce the influence on a non-signal shielding region.
Description
Technical Field
The invention relates to the field of communication, in particular to a cellular network electromagnetic interference method and system based on environment identification.
Background
The signal shielding device is a device for shielding signals by adopting a common-frequency pressing mode, can simultaneously transmit broadband signals of a plurality of frequency bands, and has interference ranges including various radio services such as GSM, DCS, 3G, 4G, GPS, WiFi, PHS and the like. The signal shielding device is generally used in special environments such as secret conference rooms, school examination rooms, prisons, national important governments, military departments and the like. At present, the existing signal shielding scheme of the signal shielding device mainly transmits high-power white noise as an interference signal, so that the signal-to-noise ratio of a received signal of a user terminal is low, a wireless signal transmitted by a base station in a shielding area cannot be normally demodulated from the received signal, and signal shielding between a mobile terminal and the base station in the shielding area is realized. However, since the existing shielding device emits the interference signal with strong power, the wireless signal of the mobile terminal which does not need to be shielded outside the target area is often influenced by the interference signal, and meanwhile, the base station of the peripheral operator can also receive the influence of the high-power signal and raise the background noise, so that the base station cannot normally demodulate the wireless signal emitted by the mobile terminal which does not need to be shielded, and the normal communication of a large number of customers which does not need to be shielded is influenced.
Disclosure of Invention
The invention aims to provide a cellular network electromagnetic interference method and a cellular network electromagnetic interference system based on environment identification, which aim to realize directional shielding on signals in a shielding area and reduce the influence on a non-signal shielding area.
In order to achieve the purpose, the invention provides the following scheme:
a cellular network electromagnetic interference method based on environment identification comprises the following steps:
acquiring a detection signal of a region to be shielded and a base station signal of the region to be shielded in a signal detection time slot;
determining the space size coordinate of the region to be shielded according to the parameters of the detection signals;
determining the base station signal intensity of the area to be shielded by using a signal attenuation model according to the base station signal;
according to the space size coordinate of the area to be shielded and the signal intensity of the base station, determining an electromagnetic interference parameter to the area to be shielded based on a beam forming principle and a signal attenuation model; the electromagnetic interference parameters comprise electromagnetic interference power and antenna waveform;
adjusting an antenna array of an interference system according to the electromagnetic interference parameters to generate an interference signal to the area to be shielded; and the interference signal is sent to the area to be shielded in an interference signal sending time slot.
Optionally, the acquiring, in the signal detection timeslot, the detection signal of the region to be shielded and the base station signal of the region to be shielded specifically includes:
in a signal detection time slot, a transmitting circuit of the antenna array is utilized to transmit a detection signal to the area to be shielded;
receiving the returned detection signal by using a receiving circuit of the antenna array to obtain a detection signal of a region to be shielded;
and receiving the base station signal of the area to be shielded by utilizing the receiving circuit of the antenna array to obtain the base station signal.
Optionally, the determining the spatial dimension coordinate of the region to be shielded according to the parameter of the detection signal specifically includes:
acquiring the return time of each detection signal;
determining the distance from the interference system to each reflection point of the region to be shielded according to the return time of each detection signal;
and constructing the space point cloud of the region to be shielded based on a classification regression algorithm according to the distance between the interference system and each reflection point to obtain the space size coordinate of the region to be shielded.
Optionally, the determining, according to the base station signal, the base station signal strength of the area to be shielded by using a signal attenuation model specifically includes:
acquiring the position coordinates of the base station according to the base station signals;
determining the signal intensity of the base station of the area to be shielded by using a formula RSS- (10 multiplied by alpha multiplied by lgd + A) according to the space size coordinate of the area to be shielded and the position coordinate of the base station; wherein α is a signal attenuation factor of the signal attenuation model; d is the distance between the area to be shielded and the base station, and A is the average strength of the base station signal at the position 1m away from the transmitting point of the base station; and RSS is the signal strength of the base station of the area to be shielded.
Optionally, the adjusting an antenna array of an interference system according to the electromagnetic interference parameter to generate an interference signal to the area to be shielded specifically includes:
and adjusting the intensity, frequency and phase of the interference signal transmitted by the antenna array by adjusting the current of the antenna array transmitting circuit according to the electromagnetic interference parameter, so that the intensity of the interference signal in the area to be shielded is greater than the intensity of the signal of the base station.
The invention also provides a cellular network electromagnetic interference system based on environment identification, which comprises:
the signal detection module is used for acquiring a detection signal of a region to be shielded and a base station signal of the region to be shielded in a signal detection time slot;
the module for determining the space size coordinate of the region to be shielded is used for determining the space size coordinate of the region to be shielded according to the parameters of the detection signals;
a base station signal strength determining module, configured to determine, according to the base station signal, a base station signal strength of the to-be-shielded area by using a signal attenuation model;
the electromagnetic interference parameter determining module is used for determining electromagnetic interference parameters of the area to be shielded based on a beam forming principle and a signal attenuation model according to the space size coordinate of the area to be shielded and the signal intensity of the base station; the electromagnetic interference parameters comprise electromagnetic interference power and antenna waveform;
the interference signal adjusting module is used for adjusting an antenna array of an interference system according to the electromagnetic interference parameters to generate an interference signal to the area to be shielded; and the interference signal is sent to the area to be shielded in an interference signal sending time slot.
Optionally, the signal detection module specifically includes:
the signal transmitting unit is used for transmitting a detection signal to the area to be shielded by using a transmitting circuit of the antenna array in a signal detection time slot;
the detection signal receiving unit is used for receiving the returned detection signal by using the receiving circuit of the antenna array to obtain a detection signal of a region to be shielded;
and the base station signal receiving unit is used for receiving the base station signal of the area to be shielded by utilizing the receiving circuit of the antenna array to obtain the base station signal.
Optionally, the module for determining the spatial dimension coordinate of the region to be shielded specifically includes:
a return time acquisition unit for acquiring a return time of each detection signal;
a reflection point distance determining unit, configured to determine, according to the return time of each detection signal, a distance from the interference system to each reflection point of the area to be shielded;
and the space size coordinate acquisition unit of the area to be shielded is used for constructing the space point cloud of the area to be shielded based on a classification regression algorithm according to the distance between the interference system and each reflection point to obtain the space size coordinate of the area to be shielded.
Optionally, the base station signal strength determining module specifically includes:
the position coordinate determining unit is used for acquiring the position coordinate of the base station according to the base station signal;
a base station signal strength determining unit, configured to determine, according to the spatial size coordinate of the to-be-shielded area and the position coordinate of the base station, a base station signal strength of the to-be-shielded area by using a formula RSS ═ 10 × α × lgd + a; wherein α is a signal attenuation factor of the signal attenuation model; d is the distance between the area to be shielded and the base station, and A is the average strength of the base station signal at the position 1m away from the transmitting point of the base station; and RSS is the signal strength of the base station of the area to be shielded.
Optionally, the interference signal adjusting module specifically includes:
and the interference signal parameter adjusting unit is used for adjusting the intensity, frequency and phase of the interference signal transmitted by the antenna array by adjusting the current of the antenna array transmitting circuit according to the electromagnetic interference parameter, so that the intensity of the interference signal in the area to be shielded is greater than the intensity of the signal of the base station.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention can identify the radio frequency information of the base station, the size and the shape of the space of the area to be shielded and the relative position of the interference system in the space, intelligently adjust the size of the interference signal required by the shielding space, and limit the interference signal in the space to be shielded as much as possible through the antenna array, thereby solving the problem that the wireless communication between the mobile terminal which does not need to be shielded outside the range of the target area is interfered and the base station when the existing electromagnetic interference system is applied.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic flow chart of a cellular network electromagnetic interference method based on environment identification according to the present invention;
FIG. 2 is a schematic structural diagram of an embodiment 1 of the cellular network electromagnetic interference system based on environment identification according to the present invention;
fig. 3 is a schematic structural diagram of an electromagnetic interference system 2 of a cellular network based on environment identification according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic flow chart of the cellular network electromagnetic interference method based on environment identification according to the present invention. As shown in fig. 1, the cellular network electromagnetic interference method based on environment identification of the present invention includes the following steps:
step 100: and acquiring a detection signal of a region to be shielded and a base station signal of the region to be shielded in the signal detection time slot. In the signal detection time slot, the detection signal is transmitted to the area to be shielded by using the transmitting circuit of the antenna array, and the detection signal returned by the reflection point of the area to be shielded is received by using the receiving circuit of the antenna array, so that the detection signal of the area to be shielded is obtained. And meanwhile, receiving the base station signal of the area to be shielded by using a receiving circuit of the antenna array to obtain the base station signal.
Step 200: and determining the space size coordinate of the region to be shielded according to the parameters of the detection signals. The detection signals are analyzed to obtain the information such as the intensity, the propagation time, the return time and the like of each detection signal. The return time of each detection signal is multiplied by the light speed, so that the distance from the reflection point corresponding to each detection signal to the signal emission point of the interference system can be obtained. Then, the spatial information of the region to be shielded, including the size and shape of the space and the relative position of the interference system in the space, can be obtained by using a classification and regression algorithm, so that the spatial point cloud of the region to be shielded is constructed, and the spatial dimension coordinate of the region to be shielded is obtained. The strength and distance information of the detection signals can be input into the neural network model by adopting a trained neural network model, and the spatial information of each detection signal is output through a classification regression algorithm built in the neural network model, so that the spatial information of the whole region to be shielded is obtained.
Step 300: and determining the signal intensity of the base station in the area to be shielded by using a signal attenuation model according to the base station signal. The base station signal is analyzed to obtain information such as the strength of the base station signal, the position coordinates of the base station, the number of the base station and the like. And substituting the signal intensity of the base station signal obtained by current detection and the distance between the interference system and the base station into the signal attenuation model to obtain an unknown parameter alpha in the signal attenuation model. Furthermore, the distance between the area to be shielded and the base station can be determined according to the space size coordinates of the area to be shielded and the position coordinates of the base station, and the signal strength of the base station in the area to be shielded can be obtained by substituting the distance between the area to be shielded and the base station into the signal attenuation model RSS- (10 × α × lgd + a). In the formula, alpha is a signal attenuation factor of the signal attenuation model; d is the distance between the area to be shielded and the base station, and A is the average strength of the base station signal at the position 1m away from the transmitting point of the base station; and RSS is the signal strength of the base station of the area to be shielded.
Step 400: and determining the electromagnetic interference parameters of the area to be shielded based on a beam forming principle and a signal attenuation model according to the space size coordinate of the area to be shielded and the signal intensity of the base station. The electromagnetic interference parameters include electromagnetic interference power and antenna waveform.
Step 500: and adjusting an antenna array of the interference system according to the electromagnetic interference parameters to generate an interference signal of the area to be shielded. Specifically, according to the electromagnetic interference parameters, the intensity, the frequency and the phase of the interference signal transmitted by the antenna array are adjusted by adjusting the current of the antenna array transmitting circuit, so that the interference signal is generated, the intensity of the interference signal in the area to be shielded is greater than the intensity of the signal of the base station, and then the interference signal is transmitted to the area to be shielded in the interference signal transmitting time slot, so that the signal shielding of the area to be shielded is realized.
Fig. 2 is a schematic structural diagram of an electromagnetic interference system 1 of a cellular network based on environment recognition according to an embodiment of the present invention, and as shown in fig. 2, the electromagnetic interference system of the cellular network based on environment recognition according to the embodiment includes the following structures:
the signal detection module 201 is configured to acquire a detection signal of a region to be shielded and a base station signal of the region to be shielded in a signal detection time slot.
And a module 202 for determining the spatial dimension coordinate of the region to be shielded, configured to determine the spatial dimension coordinate of the region to be shielded according to the parameter of the probe signal.
A base station signal strength determining module 203, configured to determine, according to the base station signal, the base station signal strength of the area to be shielded by using a signal attenuation model.
An electromagnetic interference parameter determining module 204, configured to determine, according to the spatial dimension coordinate of the to-be-shielded area and the base station signal strength, an electromagnetic interference parameter for the to-be-shielded area based on a beam forming principle and a signal attenuation model; the electromagnetic interference parameters include electromagnetic interference power and antenna waveform.
An interference signal adjusting module 205, configured to adjust an antenna array of an interference system according to the electromagnetic interference parameter, and generate an interference signal for the area to be shielded; and the interference signal is sent to the area to be shielded in an interference signal sending time slot.
As a specific embodiment, in the cellular network electromagnetic interference system based on environment identification of the present invention, the signal detection module 201 specifically includes:
and the signal transmitting unit is used for transmitting a detection signal to the area to be shielded by using a transmitting circuit of the antenna array in a signal detection time slot.
And the detection signal receiving unit is used for receiving the returned detection signal by using the receiving circuit of the antenna array to obtain the detection signal of the area to be shielded.
And the base station signal receiving unit is used for receiving the base station signal of the area to be shielded by utilizing the receiving circuit of the antenna array to obtain the base station signal.
As a specific embodiment, in the cellular network electromagnetic interference system based on environment identification, the module 202 for determining the spatial dimension coordinate of the area to be shielded specifically includes:
a return time acquisition unit for acquiring a return time of each of the detection signals.
And the reflection point distance determining unit is used for determining the distance from the interference system to each reflection point of the area to be shielded according to the return time of each detection signal.
And the space size coordinate acquisition unit of the area to be shielded is used for constructing the space point cloud of the area to be shielded based on a classification regression algorithm according to the distance between the interference system and each reflection point to obtain the space size coordinate of the area to be shielded.
As a specific embodiment, in the cellular network electromagnetic interference system based on environment identification of the present invention, the base station signal strength determining module 203 specifically includes:
and the position coordinate determining unit is used for acquiring the position coordinate of the base station according to the base station signal.
A base station signal strength determining unit, configured to determine, according to the spatial size coordinate of the to-be-shielded area and the position coordinate of the base station, a base station signal strength of the to-be-shielded area by using a formula RSS ═ 10 × α × lgd + a; wherein α is a signal attenuation factor of the signal attenuation model; d is the distance between the area to be shielded and the base station, and A is the average strength of the base station signal at the position 1m away from the transmitting point of the base station; and RSS is the signal strength of the base station of the area to be shielded.
As a specific embodiment, in the cellular network electromagnetic interference system based on environment identification of the present invention, the interference signal adjusting module 205 specifically includes:
and the interference signal parameter adjusting unit is used for adjusting the intensity, frequency and phase of the interference signal transmitted by the antenna array by adjusting the current of the antenna array transmitting circuit according to the electromagnetic interference parameter, so that the intensity of the interference signal in the area to be shielded is greater than the intensity of the signal of the base station.
Fig. 3 is a schematic structural diagram of an electromagnetic interference system 2 of a cellular network based on environment identification according to an embodiment of the present invention. As shown in fig. 3, the cellular network electromagnetic interference system based on environment recognition of the present embodiment includes: an antenna array 301, transmit circuitry 308 and receive circuitry 302 matched to the antenna array, and a master control system 303. The main control system 303 includes a radio frequency information acquisition processing module 304, an intelligent identification module 305, an interference control module 306, and a timing control module 307.
When the antenna array 301 is connected to the transmitting circuit 308, the environment detection signal and the communication interference signal are transmitted in different time slots.
The antenna array 301 is connected to the receiving circuit 302, and is configured to receive a base station radio frequency signal in an environment and a transmission signal of environment detection information in an indoor space.
The main control system 303 firstly collects base station radio frequency information in an environment, and then obtains spatial information through detection signals, and reflection signals of all radio frequency signal detection signals are processed by the radio frequency information collection processing module 304. The size of the interference signal is intelligently identified by the intelligent identification module 305 by using the base station radio frequency information and the space information, and the generation of the interference signal is intelligently controlled by the interference control module 306.
And the time sequence control module 307 is used for the time sequence relation among the radio frequency information acquisition and processing module, the intelligent identification module and the interference control module. The whole interference system does not transmit any signal at first, acquires the base station radio frequency information in the space in the signal detection time slot, and then transmits the detection signal to acquire the space information; and finally, intelligently adjusting the interference signal and sending the interference signal to the area to be shielded in the interference signal sending time slot.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. A cellular network electromagnetic interference method based on environment recognition is characterized by comprising the following steps:
acquiring a detection signal acquired from a region to be shielded and a base station signal of the region to be shielded in a signal detection time slot;
determining the space size coordinate of the region to be shielded according to the parameters of the detection signals; the specific process is as follows: acquiring the return time of each detection signal; determining the distance from the interference system to each reflection point of the region to be shielded according to the return time of each detection signal; constructing a spatial point cloud of the region to be shielded based on a classification regression algorithm according to the distance from the interference system to each reflection point to obtain a spatial dimension coordinate of the region to be shielded;
determining the base station signal intensity of the area to be shielded by using a signal attenuation model according to the base station signal; the specific process is as follows: acquiring the position coordinates of the base station according to the base station signals; determining the signal intensity of the base station of the area to be shielded by using a formula RSS- (10 multiplied by alpha multiplied by lgd + A) according to the space size coordinate of the area to be shielded and the position coordinate of the base station; wherein α is a signal attenuation factor of the signal attenuation model; d is the distance between the area to be shielded and the base station, and A is the average strength of the base station signal at the position 1m away from the transmitting point of the base station; RSS is the base station signal strength of the area to be shielded;
according to the space size coordinate of the area to be shielded and the signal intensity of the base station, determining an electromagnetic interference parameter to the area to be shielded based on a beam forming principle and a signal attenuation model; the electromagnetic interference parameters comprise electromagnetic interference power and antenna waveform;
adjusting an antenna array of an interference system according to the electromagnetic interference parameters to generate an interference signal to the area to be shielded; and the interference signal is sent to the area to be shielded in an interference signal sending time slot.
2. The method according to claim 1, wherein the acquiring, in the signal sounding time slot, the sounding signal acquired from the region to be shielded and the base station signal of the region to be shielded specifically includes:
in a signal detection time slot, transmitting a first signal to the area to be shielded by using a transmitting circuit of the antenna array;
receiving a returned second signal by using a receiving circuit of the antenna array to obtain a detection signal acquired by a region to be shielded; the second signal is a signal returned after the first signal reaches the region to be shielded;
and receiving the base station signal of the area to be shielded by utilizing the receiving circuit of the antenna array to obtain the base station signal.
3. The method of claim 1, wherein the adjusting an antenna array of an interference system according to the electromagnetic interference parameter to generate an interference signal to the area to be shielded comprises:
and adjusting the intensity, frequency and phase of the interference signal transmitted by the antenna array by adjusting the current of the antenna array transmitting circuit according to the electromagnetic interference parameter, so that the intensity of the interference signal in the area to be shielded is greater than the intensity of the signal of the base station.
4. A cellular network electromagnetic interference system based on environment identification, comprising:
the signal detection module is used for acquiring a detection signal acquired by a region to be shielded and a base station signal of the region to be shielded in a signal detection time slot;
the module for determining the space size coordinate of the region to be shielded is used for determining the space size coordinate of the region to be shielded according to the parameters of the detection signals; the module for determining the space size coordinate of the region to be shielded specifically comprises: a return time acquisition unit for acquiring a return time of each detection signal; a reflection point distance determining unit, configured to determine, according to the return time of each detection signal, a distance from the interference system to each reflection point of the area to be shielded; the spatial dimension coordinate acquisition unit of the area to be shielded is used for constructing spatial point cloud of the area to be shielded based on a classification regression algorithm according to the distance between the interference system and each reflection point to obtain the spatial dimension coordinate of the area to be shielded;
a base station signal strength determining module, configured to determine, according to the base station signal, a base station signal strength of the to-be-shielded area by using a signal attenuation model; the base station signal strength determining module specifically includes: the position coordinate determining unit is used for acquiring the position coordinate of the base station according to the base station signal; a base station signal strength determining unit, configured to determine, according to the spatial size coordinate of the to-be-shielded area and the position coordinate of the base station, a base station signal strength of the to-be-shielded area by using a formula RSS ═ 10 × α × lgd + a; wherein α is a signal attenuation factor of the signal attenuation model; d is the distance between the area to be shielded and the base station, and A is the average strength of the base station signal at the position 1m away from the transmitting point of the base station; RSS is the base station signal strength of the area to be shielded;
the electromagnetic interference parameter determining module is used for determining electromagnetic interference parameters of the area to be shielded based on a beam forming principle and a signal attenuation model according to the space size coordinate of the area to be shielded and the signal intensity of the base station; the electromagnetic interference parameters comprise electromagnetic interference power and antenna waveform;
the interference signal adjusting module is used for adjusting an antenna array of an interference system according to the electromagnetic interference parameters to generate an interference signal to the area to be shielded; and the interference signal is sent to the area to be shielded in an interference signal sending time slot.
5. The system of claim 4, wherein the signal detection module specifically comprises:
the signal transmitting unit is used for transmitting a first signal to the area to be shielded by using a transmitting circuit of the antenna array in a signal detection time slot;
the detection signal receiving unit is used for receiving the returned second signal by using the receiving circuit of the antenna array to obtain a detection signal acquired by the area to be shielded; the second signal is a signal returned after the first signal reaches the region to be shielded;
and the base station signal receiving unit is used for receiving the base station signal of the area to be shielded by utilizing the receiving circuit of the antenna array to obtain the base station signal.
6. The cellular network electromagnetic interference system based on environment recognition according to claim 4, wherein the interference signal adjusting module specifically comprises:
and the interference signal parameter adjusting unit is used for adjusting the intensity, frequency and phase of the interference signal transmitted by the antenna array by adjusting the current of the antenna array transmitting circuit according to the electromagnetic interference parameter, so that the intensity of the interference signal in the area to be shielded is greater than the intensity of the signal of the base station.
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| US7050755B2 (en) * | 2002-01-24 | 2006-05-23 | Pctel Maryland, Inc. | Targeted mobile terminal communication blocker |
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