CN108832942A - A kind of terminal positioning interference filtering method, terminal and computer readable storage medium - Google Patents
A kind of terminal positioning interference filtering method, terminal and computer readable storage medium Download PDFInfo
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- CN108832942A CN108832942A CN201810288491.2A CN201810288491A CN108832942A CN 108832942 A CN108832942 A CN 108832942A CN 201810288491 A CN201810288491 A CN 201810288491A CN 108832942 A CN108832942 A CN 108832942A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
-
- 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
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
- G01S19/45—Determining position by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement
- G01S19/46—Determining position by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement the supplementary measurement being of a radio-wave signal type
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The present invention provides a kind of terminal positioning interference filtering method, which includes the following steps：After the GPS antenna of terminal receives signal, the signal identification feature of signal is obtained；Judge whether signal is GPS positioning signal according to signal identification feature；If so, then receiving signal using signal as effective；If not, signal is interference signal, and using signal as invalid receiver signal；The present invention also provides a kind of terminal and computer readable storage mediums, through the above scheme, after the GPS antenna of terminal receives signal, first judge whether signal is GPS positioning signal, when the signal received is GPS positioning signal, just as effectively reception signal；When the signal received is not GPS positioning signal, then signal is interference signal, and using signal as invalid receiver signal；The problem of substantially improving for a long time to GPS positioning signal interference, improves GPS positioning performance, the user experience is improved.
Description
Technical field
The present invention relates to field of terminal technology, more specifically to a kind of terminal positioning interference filtering method, terminal and
Computer readable storage medium.
Background technique
Currently, (Global Positioning System, the whole world are fixed by the GPS in the terminals such as smart phone, tablet computer
Position system) performance of antenna is increasingly becoming the index that terminal user's emphasis is considered.
By taking smart phone as an example, mobile communication frequency range is more and more, when mobile phone uses GPS navigation under existing Network Communication state
When, the GPS positioning signal that GPS antenna receives would generally be by the interference of other signals, and a kind of most specific interference is LTE
The secondary frequency multiplication harmonic wave of (Long Term Evolution, long term evolution)-B13 transmitting frequency range (786MHz-787MHz) is just beaten
Middle GPS receiver frequency range (1574.4MHz-1576.4MHz), leads to GPS receiver degradation, is interfered.
Therefore, the interference signal to GPS antenna how is filtered out, is those skilled in the art's urgent problem to be solved.
Summary of the invention
It is a primary object of the present invention to propose a kind of terminal positioning interference filtering method, terminal and computer-readable storage
Medium, it is intended to it solves in the prior art, the GPS positioning signal that GPS antenna receives in terminal will receive the interference of other signals,
The problem of leading to GPS receiver degradation.
In order to solve the above technical problems, the present invention provides a kind of terminal positioning interference filtering method, terminal positioning interference filter
Except method includes the following steps：
After the GPS antenna of terminal receives signal, the signal identification feature of signal is obtained；
Judge whether signal is GPS positioning signal according to signal identification feature；
If so, then receiving signal using signal as effective；
If not, signal is interference signal, and using signal as invalid receiver signal.
Optionally, the signal identification feature of signal is obtained；Judge whether signal is GPS positioning letter according to signal identification feature
Number include：
Obtain the messaging parameter of signal；
Judge whether signal is GPS positioning signal according to messaging parameter.
Optionally, messaging parameter includes the modulation system of signal.
Optionally, the messaging parameter for obtaining signal includes：
Obtain the subsignal in signal；
Sub-signal is demodulated；
According to demodulation result, the modulation system of signal is obtained.
Optionally, judge whether signal is that GPS positioning signal includes according to messaging parameter：
When modulation system is the spread spectrum binary phase shift keying modulation based on Code Division Multiple Access, then judge that signal is
GPS positioning signal；
When modulation system is quadrature phase shift keying modulation or quadrature amplitude modulation based on frequency division multiple access technology, then judge
Signal is interference signal.
Optionally, the signal identification feature of signal is obtained；Judge whether signal is GPS positioning letter according to signal identification feature
Number include：
Obtain the signal structure of signal；
Judge whether signal is GPS positioning signal according to signal structure.
Optionally, the signal identification feature of signal is obtained；Judge whether signal is GPS positioning letter according to signal identification feature
Number include：
Obtain the identity information that signal carries；
Judge whether signal is GPS positioning signal according to identity information.
Optionally, using signal as it is effective receive signal after, it is further comprising the steps of：Signal is demodulated, and
GPS positioning processing is carried out according to the signal after demodulation.
Further, the present invention provides a kind of terminal, and terminal includes processor, memory and communication bus；
Communication bus is for realizing the connection communication between processor and memory；
Processor is for executing one or more program stored in memory, to realize terminal positioning interference as above
The step of filtering method.
Further, the present invention provides a kind of computer readable storage medium, and computer-readable recording medium storage has one
A or multiple programs, one or more program can be executed by one or more processor, to realize a kind of end as above
The step of holding location interference filtering method.
Beneficial effect
The present invention provides a kind of terminal positioning interference filtering method, terminal and computer readable storage medium, the terminals
Location interference filtering method includes the following steps：After the GPS antenna of terminal receives signal, the signal identification of signal is obtained
Feature；Judge whether signal is GPS positioning signal according to signal identification feature；If so, then receiving signal using signal as effective；
If not, signal is interference signal, and using signal as invalid receiver signal；Through the above scheme, it is connect in the GPS antenna of terminal
After receiving signal, first judge whether signal is GPS positioning signal, when the signal received is GPS positioning signal, ability conduct
Effectively receive signal；When the signal received is not GPS positioning signal, then signal is interference signal, and using signal as nothing
Effect receives signal；The problem of substantially improving for a long time to GPS positioning signal interference, improves GPS positioning performance, improves use
Family experience.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing：
The hardware structural diagram of Fig. 1 each embodiment one optional terminal to realize the present invention；
Fig. 2 is a kind of basic flow chart for terminal positioning interference filtering method that first embodiment of the invention provides；
Fig. 3 is the schematic diagram of a kind of GPS circuitry design that the prior art provides and the design of primary antenna transmission circuit；
Fig. 4 is the basic flow chart for another terminal positioning interference filtering method that second embodiment of the invention provides；
Fig. 5 is a kind of schematic diagram for terminal that third embodiment of the invention provides.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
In subsequent description, it is only using the suffix for indicating such as " module ", " component " or " unit " of element
Be conducive to explanation of the invention, itself there is no specific meanings.Therefore, " module " can mixedly make with " component "
With.
Terminal can be implemented in a variety of manners.For example, terminal described in the present invention may include such as mobile phone, plate
Computer, camera, laptop, palm PC, personal digital assistant (Personal Digital Assistant, PDA),
Portable media player (Portable Media Player, PMP), navigation device, wearable device, Intelligent bracelet, step counting
The fixed terminals such as the mobile terminals such as device, and number TV, desktop computer.
It will be appreciated by those skilled in the art that other than the element for being used in particular for mobile purpose, it is according to the present invention
The construction of embodiment can also apply to the terminal of fixed type.
Referring to Fig. 1, the hardware structural diagram of its each embodiment one optional terminal to realize the present invention, the end
End 100 may include：RF (Radio Frequency, radio frequency) unit 101, WiFi module 102, audio output unit 103, A/V
(audio/video) input unit 104, sensor 105, display unit 106, user input unit 107, interface unit 108, storage
The components such as device 109 and processor 110.It will be understood by those skilled in the art that terminal structure shown in Fig. 1 is not constituted pair
The restriction of terminal, terminal may include perhaps combining certain components or different components than illustrating more or fewer components
Arrangement.
It is specifically introduced below with reference to all parts of the Fig. 1 to terminal：
Radio frequency unit 101 can be used for receiving and sending messages or communication process in, signal sends and receivees, specifically, by base station
Downlink information receive after, to processor 110 handle；In addition, the data of uplink are sent to base station.In general, radio frequency unit 101
Including but not limited to antenna, at least one amplifier, transceiver, coupler, low-noise amplifier, duplexer etc..In addition, penetrating
Frequency unit 101 can also be communicated with network and other equipment by wireless communication.Any communication can be used in above-mentioned wireless communication
Standard or agreement, including but not limited to GSM (Global System of Mobile communication, global system for mobile telecommunications
System), GPRS (General Packet Radio Service, general packet radio service), CDMA1000 (Code
Division Multiple Access 1000, CDMA 1000), WCDMA (Wideband Code Division
Multiple Access, wideband code division multiple access), TD-SCDMA (Time Division-Synchronous Code
Division Multiple Access, TD SDMA), FDD-LTE (Frequency Division
Duplexing-Long Term Evolution, frequency division duplex long term evolution) and TDD-LTE (Time Division
Duplexing-Long Term Evolution, time division duplex long term evolution) etc..
WiFi belongs to short range wireless transmission technology, and terminal can help user's transceiver electronics postal by WiFi module 102
Part, browsing webpage and access streaming video etc., it provides wireless broadband internet access for user.
Audio output unit 103 can be in call signal reception pattern, call mode, logging mode, language in terminal 100
It is radio frequency unit 101 or WiFi module 102 is received or depositing when under the isotypes such as sound recognition mode, broadcast reception mode
The audio data stored in reservoir 109 is converted into audio signal and exports to be sound.Moreover, audio output unit 103 may be used also
To provide audio output relevant to the specific function that terminal 100 executes (for example, call signal receives sound, message sink sound
Sound etc.).Audio output unit 103 may include loudspeaker, buzzer etc..
A/V input unit 104 is for receiving audio or video signal.A/V input unit 104 may include graphics processor
(Graphics Processing Unit, GPU) 1041 and microphone 1042, graphics processor 1041 is in video acquisition mode
Or the image data of the static images or video obtained in image capture mode by image capture apparatus (such as camera) carries out
Reason.Treated, and picture frame may be displayed on display unit 106.Through graphics processor 1041, treated that picture frame can be deposited
Storage is sent in memory 109 (or other storage mediums) or via radio frequency unit 101 or WiFi module 102.Mike
Wind 1042 can connect in telephone calling model, logging mode, speech recognition mode etc. operational mode via microphone 1042
Quiet down sound (audio data), and can be audio data by such acoustic processing.Audio that treated (voice) data can
To be converted to the format output that can be sent to mobile communication base station via radio frequency unit 101 in the case where telephone calling model.
Microphone 1042 can be implemented various types of noise filterings (or inhibition) algorithm and send and receive sound to filter out (or inhibition)
The noise generated during frequency signal or interference.
Terminal 100 further includes at least one sensor 105, such as optical sensor, motion sensor and other sensors.
Specifically, optical sensor includes ambient light sensor and proximity sensor, wherein ambient light sensor can be according to ambient light
Light and shade adjusts the brightness of display panel 1061, and proximity sensor can close display panel when terminal 100 is moved in one's ear
1061 and/or backlight.As a kind of motion sensor, accelerometer sensor can detect in all directions (generally three axis) and add
The size of speed can detect that size and the direction of gravity when static, can be used to identify application (such as the horizontal/vertical screen of mobile phone posture
Switching, dependent game, magnetometer pose calibrating), Vibration identification correlation function (such as pedometer, tap) etc.；Also as mobile phone
Configurable fingerprint sensor, pressure sensor, iris sensor, molecule sensor, gyroscope, barometer, hygrometer, temperature
The other sensors such as meter, infrared sensor, details are not described herein.
Display unit 106 is for showing information input by user or being supplied to the information of user.Display unit 106 can wrap
Display panel 1061 is included, liquid crystal display (Liquid Crystal Display, LCD), Organic Light Emitting Diode can be used
Forms such as (Organic Light-Emitting Diode, OLED) configure display panel 1061.
User input unit 107 can be used for receiving the number or character information of input, and generate the user with terminal 100
Setting and the related key signals input of function control.Specifically, user input unit 107 may include touch panel 1071 and
Other input equipments 1072.Touch panel 1071, also referred to as touch screen collect the touch operation of user on it or nearby
(for example user uses any suitable objects or attachment such as finger, stylus on touch panel 1071 or in touch panel 1071
Neighbouring operation), and corresponding attachment device is driven according to preset formula.Touch panel 1071 may include touch detection
Two parts of device and touch controller.Wherein, the touch orientation of touch detecting apparatus detection user, and detect touch operation band
The signal come, transmits a signal to touch controller；Touch controller receives touch information from touch detecting apparatus, and by it
It is converted into contact coordinate, then gives processor 110, and order that processor 110 is sent can be received and executed.In addition, can
To realize touch panel 1071 using multiple types such as resistance-type, condenser type, infrared ray and surface acoustic waves.In addition to touch panel
1071, user input unit 107 can also include other input equipments 1072.Specifically, other input equipments 1072 can wrap
It includes but is not limited in physical keyboard, function key (such as volume control button, switch key etc.), trace ball, mouse, operating stick etc.
It is one or more, specifically herein without limitation.
Further, touch panel 1071 can cover display panel 1061, when touch panel 1071 detect on it or
After neighbouring touch operation, processor 110 is sent to determine the type of touch event, is followed by subsequent processing device 110 according to touch thing
The type of part provides corresponding visual output on display panel 1061.Although in Fig. 1, touch panel 1071 and display panel
1061 be the function that outputs and inputs of realizing mobile terminal as two independent components, but in certain embodiments, it can
The function that outputs and inputs of terminal is realized so that touch panel 1071 and display panel 1061 is integrated, is not limited herein specifically
It is fixed.
Interface unit 108 be used as at least one external device (ED) connect with terminal 100 can by interface.For example, external
Device may include wired or wireless headphone port, external power supply (or battery charger) port, wired or wireless number
According to port, memory card port, port, the port audio input/output (I/O), view for connecting the device with identification module
The port frequency I/O, ear port etc..Interface unit 108 can be used for receiving the input from external device (ED) (for example, data are believed
Breath, electric power etc.) and by one or more elements that the input received is transferred in terminal 100 or can be used at end
Data are transmitted between end 100 and external device (ED).
Memory 109 can be used for storing software program and various data.Memory 109 can mainly include storing program area
The storage data area and, wherein storing program area can (such as the sound of application program needed for storage program area, at least one function
Sound playing function, image player function etc.) etc.；Storage data area can store according to mobile phone use created data (such as
Audio data, phone directory etc.) etc..In addition, memory 109 may include high-speed random access memory, it can also include non-easy
The property lost memory, a for example, at least disk memory, flush memory device or other volatile solid-state parts.
Processor 110 is the control centre of terminal 100, utilizes each of various interfaces and the entire terminal 100 of connection
Part by running or execute the software program and/or module that are stored in memory 109, and calls and is stored in memory
Data in 109 execute the various functions and processing data of terminal 100, to carry out integral monitoring to terminal 100.Processor
110 may include one or more processing units；Preferably, processor 110 can integrate application processor and modem processor,
Wherein, the main processing operation system of application processor, user interface and application program etc., modem processor mainly handles nothing
Line communication.It is understood that above-mentioned modem processor can not also be integrated into processor 110.
Although Fig. 1 is not shown, terminal 100 can also be including bluetooth module etc., and details are not described herein.
Based on above-mentioned terminal hardware structure, below by way of specific embodiment, the present invention is described in detail.
First embodiment
In order to solve in the prior art, the GPS positioning signal that GPS antenna receives in terminal will receive the dry of other signals
The problem of disturbing, leading to GPS receiver degradation, the present embodiment will provide a kind of terminal positioning interference filtering method, the present embodiment
Terminal positioning interference filtering method be applied to terminal in, wherein terminal includes smart phone, tablet computer, computer, reading
Device, intelligent wearable device etc., wherein intelligent wearable device such as smartwatch, Intelligent bracelet etc.；Referring to fig. 2, Fig. 2 is this reality
A kind of basic flow chart of terminal positioning interference filtering method of example offer is applied, which includes following
Step：
S201：After the GPS antenna of terminal receives signal, the signal identification feature of signal is obtained；
Optionally, when terminal opens GPS positioning function under LTE-B13 communications status, the step of S201 can be entered
Suddenly, because being the interference from LTE-B13 signal to the interference of GPS antenna one of the most common type.Alternatively, as long as terminal opens
GPS positioning function, can enter S201 the step of because interference signal is other than being LTE-B13 signal, it is also possible to its
The interference signal of his type.
In order to know that the signal that the GPS antenna of terminal receives is GPS positioning signal or interference signal, in GPS antenna
After receiving signal, signal is not demodulated directly, before demodulation, the signal identification for first obtaining signal is special
Sign, the effect of signal identification feature are：According to signal identification feature, the identity information of signal is determined, namely determine signal
It is GPS positioning signal or interference signal.
S202：Judge whether signal is GPS positioning signal according to signal identification feature；If so, then entering S203；If not,
Then enter S204；
Signal identification feature is to be able to reflect the information of signal identity, wherein the signal identification feature of signal is signal
Messaging parameter, perhaps for signal carry identity information or be the signal structure etc. of signal, however it is not limited to above-mentioned 3 kinds
Mode；
That is, in one embodiment, S201-S202 obtains the signal identification feature of signal；According to signal identification spy
Sign judges whether signal is that GPS positioning signal includes：
Obtain the messaging parameter of signal；
Judge whether signal is GPS positioning signal according to messaging parameter.
The messaging parameter of signal can reflect the identity information of signal indirectly.
Optionally, messaging parameter includes the modulation system etc. of signal.The modulation system of signal includes BPSK (Binary
Phase Shift Keying, binary phase shift keying) modulation, QPSK (Quadrature Phase Shift Keyin, it is orthogonal
Phase-shift keying (PSK)) modulation, QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation) modulation etc..
Optionally, the messaging parameter for obtaining signal includes following three steps：
The first step：Obtain the subsignal in signal；
Wherein, the subsignal in acquisition signal includes：
Any one segment signal in replica signal, as subsignal.
Second step：Sub-signal is demodulated；
Third step：According to demodulation result, the modulation system of signal is obtained.
Sub-signal is demodulated, and the modulation system of subsignal, the modulation methods of subsignal can be learnt according to demodulation result
Formula is the modulation system of signal；One signal has multiple subsignals, and a signal, modulation system is substantially only a kind of,
So the modulation system got according to demodulation result is all identical if demodulating to multiple subsignals in signal, and
It is identical as the modulation system of signal.
Above three step is the equal of first carrying out pre-demodulating processing to signal, from the result that pre-demodulating is handled, obtains
To the modulation system of signal.
Optionally, judge whether signal is that GPS positioning signal includes according to messaging parameter：
When modulation system is the expansion based on CDMA (Code Division Multiple Access, CDMA) technology
When frequency BPSK is modulated, then judge signal for GPS positioning signal；
The modulation system of GPS positioning signal is the spread spectrum BPSK modulation based on CDMA technology；
When modulation system is based on FDMA (Frequency Division Multiple Access/Address, frequency division
Multiple access) technology QPSK modulation or when QAM modulation, then judge signal for interference signal；
The modulation system of LTE-B13 signal is QPSK modulation or QAM modulation based on FDMA technology.
FDD (Frequency Division Duplexing, frequency division duplex)-LTE is by the way of frequency division, two independences
Channel transmitted and be passed up downwards respectively the technology of information.The chief technology of FDD-LTE has OFDM
(Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexing) technology, by the data flow of high speed
Multidiameter delay low rate data streams are decomposed into, are transmitted simultaneously over a number of carriers.
So GPS positioning signal is different with the modulation system of LTE-B13 signal, then can be modulated before signal demodulation
The identification of the modulation system of signal, by carrying out pre-demodulating processing to reception signal, thus judge the modulation system of signal, into
And to carry out the judgement of interference signal.
In one embodiment, S201-S202 obtains the signal identification feature of signal；Judged according to signal identification feature
Whether signal is that GPS positioning signal includes：
Obtain the signal structure of signal；
Judge whether signal is GPS positioning signal according to signal structure.
The signal structure of signal can reflect the identity information of signal indirectly.
The GPS positioning signal that GPS satellite is emitted can be divided into from structure：Carrier wave, pseudo-code and numeric data code；Wherein, pseudo-
Code is added with numeric data code exclusive or and realizes spread spectrum, and then combination code passes through BPSK again and is modulated to carrier wave, then defends
Star blazes abroad modulated carrier signal, carries out demodulation localization process after being received by terminal GPS antenna.
Identified by the signal structure to signal, if the signal structure identified be carrier wave, pseudo-code and numeric data code,
It can determine that signal is GPS positioning signal.
In one embodiment, S201-S202 obtains the signal identification feature of signal；Judged according to signal identification feature
Whether signal is that GPS positioning signal includes：
Obtain the identity information that signal carries；
Judge whether signal is GPS positioning signal according to identity information.
GPS satellite increases in GPS positioning signal for showing GPS positioning signal identity when generating GPS positioning signal
Information, be then transmitted to the GPS antenna of terminal again；If having identified and having taken in the signal that the GPS antenna of terminal receives
Band then may determine that the signal that GPS antenna receives is GPS positioning signal for showing the information of GPS positioning signal identity；
In LTE signal, the information for showing LTE signal identity can also be carried, if the letter that the GPS antenna of terminal receives
In number, the information carried for showing LTE signal identity is identified, then may determine that the signal that GPS antenna receives is LTE
Signal.
S203：Signal is received using signal as effective；
Optionally, S203 using signal as it is effective receive signal after, it is further comprising the steps of：Signal is solved
It adjusts, and GPS positioning processing is carried out according to the signal after demodulation.
When the signal for judging that GPS antenna receives is GPS positioning signal, by RF transceiver to GPS positioning signal
Carry out demodulation localization process.
S204：Signal is interference signal, and using signal as invalid receiver signal.
When the signal for judging that GPS antenna receives is not GPS positioning signal, then it can be determined that the signal is to GPS
The interference signal of antenna is filtered out using the signal as invalid receiver signal；It is carried out in the signal received to GPS antenna
Before demodulation, first judge whether the signal that GPS antenna receives is GPS positioning signal, if so, just carrying out to it at demodulation positioning
Reason, if it is not, the problem of then first being filtered out, being substantially improved for a long time to GPS positioning signal interference, it is fixed to improve GPS
Position performance.
In the prior art, aiming at the problem that LTE-B13 signal interferes GPS antenna, there is proposition following solution：Ginseng
See that Fig. 3, Fig. 3 are the schematic diagram of a kind of GPS circuitry design that the prior art provides and the design of primary antenna transmission circuit, for
The problem of LTE-B13 signal interferes GPS antenna, current solution are additionally increased in the transmitting path of LTE-B13 signal
Add a filter, filters out multiplied frequency harmonic.But such mode undoubtedly increases device cost, also occupies terminal PC B
The area of (Printed Circuit Board, printed circuit board) plate, it is also necessary to additional matching and debugging.
In Fig. 3, RF transceiver includes GPS module and primary antenna transceiver module, the signal that GPS antenna receives according to
It is secondary after wave filter, low-noise amplifier and filter, into RF transceiver, by the GPS module of RF transceiver
It is handled；LTE signal is after amplifier, duplexer, filter (for filtering out LTE-B13 signal), duplexer, by leading
Antenna is launched.
In contrast, it in the scheme of the present embodiment, without increasing hardware module, is directly realized by software algorithm
The step of S201-S204, eliminates the addition of filter circuit, reduces Material Cost, saves PCB surface product, and it is permanent to substantially improve
Since LTE-B13 signal to the interference problem of GPS positioning signal, improve GPS positioning performance, the user experience is improved.
By the implementation of the present embodiment, after the GPS antenna of terminal receives signal, first judge whether signal is GPS
Positioning signal, when the signal received is GPS positioning signal, just as effectively reception signal；It is not in the signal received
When GPS positioning signal, then signal is interference signal, and using signal as invalid receiver signal；It substantially improves for a long time to GPS
The problem of positioning signal is interfered, improves GPS positioning performance, the user experience is improved.
Second embodiment
In order to solve in the prior art, the GPS positioning signal that GPS antenna receives in terminal will receive the dry of other signals
The problem of disturbing, leading to GPS receiver degradation, the present embodiment provides a kind of terminal positioning interference filtering methods；The present embodiment with
Terminal is for mobile phone, referring to fig. 4, Fig. 4 is a kind of basic procedure of terminal positioning interference filtering method provided in this embodiment
Figure, the terminal positioning interference filtering method include the following steps：
S401：Mobile phone opens GPS positioning function under LTE-B13 communications status；
S402：After the GPS antenna of mobile phone receives the first signal, pre-demodulating processing is carried out to the first signal；
S403：According to pre-demodulating as a result, the modulation system for getting the first signal is the QPSK modulation based on FDMA technology；
S404：The first signal is determined for LTE-B13 signal, and LTE-B13 signal is interference signal, is filtered out；
S405：The GPS antenna of mobile phone receives second signal, carries out pre-demodulating processing to second signal；
S406：According to pre-demodulating as a result, the modulation system for getting second signal is the spread spectrum BPSK based on CDMA technology
Modulation；
S407：Determine that second signal is GPS positioning signal, and demodulation localization process is carried out to GPS positioning signal.
By the implementation of the present embodiment, after the GPS antenna of mobile phone receives signal, first judge whether signal is GPS
Positioning signal, when the signal received is LTE-B13 signal, then LTE-B13 signal is interference signal, and LTE-B13 is believed
It number filters out；When the signal received is GPS positioning signal, just as effectively reception signal, and GPS positioning signal is solved
Adjust localization process；The problem of LTE-B13 signal is to GPS positioning signal interference for a long time is substantially improved, GPS positioning is improved
Can, the user experience is improved.
3rd embodiment
In order to solve in the prior art, the GPS positioning signal that GPS antenna receives in terminal will receive the dry of other signals
The problem of disturbing, leading to GPS receiver degradation, the present embodiment provides a kind of terminal, the terminal of the present embodiment include smart phone,
Tablet computer, computer, reader, intelligent wearable device etc., wherein intelligent wearable device such as smartwatch, Intelligent bracelet etc.；
Referring to Fig. 5, Fig. 5 is a kind of schematic diagram of terminal provided in this embodiment, which includes processor 501, memory 502 and lead to
Believe bus 503, wherein：
Communication bus 503 is for realizing the connection communication between processor 501 and memory 502；
Processor 501 is for executing the one or more programs stored in memory 502, to realize first embodiment, the
In two embodiments the step of terminal positioning interference filtering method.
With processor 501 for executing the one or more programs stored in memory 502, to realize in first embodiment
For the step of terminal positioning interference filtering method, realization following steps are specifically included：
S201：After the GPS antenna of terminal receives signal, the signal identification feature of signal is obtained；
Optionally, when terminal opens GPS positioning function under LTE-B13 communications status, the step of S201 can be entered
Suddenly, because being the interference from LTE-B13 signal to the interference of GPS antenna one of the most common type.Alternatively, as long as terminal opens
GPS positioning function, can enter S201 the step of because interference signal is other than being LTE-B13 signal, it is also possible to its
The interference signal of his type.
In order to know that the signal that the GPS antenna of terminal receives is GPS positioning signal or interference signal, in GPS antenna
After receiving signal, signal is not demodulated directly, before demodulation, the signal identification for first obtaining signal is special
Sign, the effect of signal identification feature are：According to signal identification feature, the identity information of signal is determined, namely determine signal
It is GPS positioning signal or interference signal.
S202：Judge whether signal is GPS positioning signal according to signal identification feature；If so, then entering S203；If not,
Then enter S204；
Signal identification feature is to be able to reflect the information of signal identity, wherein the signal identification feature of signal is signal
Messaging parameter, perhaps for signal carry identity information or be the signal structure etc. of signal, however it is not limited to above-mentioned 3 kinds
Mode；
That is, in one embodiment, S201-S202 obtains the signal identification feature of signal；According to signal identification spy
Sign judges whether signal is that GPS positioning signal includes：
Obtain the messaging parameter of signal；
Judge whether signal is GPS positioning signal according to messaging parameter.
The messaging parameter of signal can reflect the identity information of signal indirectly.
Optionally, messaging parameter includes the modulation system etc. of signal.The modulation system of signal includes BPSK modulation, QPSK tune
System, QAM modulation etc..
Optionally, the messaging parameter for obtaining signal includes following three steps：
The first step：Obtain the subsignal in signal；
Wherein, the subsignal in acquisition signal includes：
Any one segment signal in replica signal, as subsignal.
Second step：Sub-signal is demodulated；
Third step：According to demodulation result, the modulation system of signal is obtained.
Sub-signal is demodulated, and the modulation system of subsignal, the modulation methods of subsignal can be learnt according to demodulation result
Formula is the modulation system of signal；One signal has multiple subsignals, and a signal, modulation system is substantially only a kind of,
So the modulation system got according to demodulation result is all identical if demodulating to multiple subsignals in signal, and
It is identical as the modulation system of signal.
Above three step is the equal of first carrying out pre-demodulating processing to signal, from the result that pre-demodulating is handled, obtains
To the modulation system of signal.
Optionally, judge whether signal is that GPS positioning signal includes according to messaging parameter：
When modulation system is the spread spectrum BPSK modulation based on CDMA technology, then judge signal for GPS positioning signal；
The modulation system of GPS positioning signal is the spread spectrum BPSK modulation based on CDMA technology；
When modulation system is QPSK modulation or QAM modulation based on FDMA technology, then judge signal for interference signal；
The modulation system of LTE-B13 signal is QPSK modulation or QAM modulation based on FDMA technology.
For FDD-LTE by the way of frequency division, two independent channels are transmitted and are passed up downwards respectively information
Technology.The chief technology of FDD-LTE has OFDM technology, and the data flow of high speed is decomposed into multidiameter delay low rate data streams,
It is transmitted simultaneously over a number of carriers.
So GPS positioning signal is different with the modulation system of LTE-B13 signal, then can be modulated before signal demodulation
The identification of the modulation system of signal, by carrying out pre-demodulating processing to reception signal, thus judge the modulation system of signal, into
And to carry out the judgement of interference signal.
In one embodiment, S201-S202 obtains the signal identification feature of signal；Judged according to signal identification feature
Whether signal is that GPS positioning signal includes：
Obtain the signal structure of signal；
Judge whether signal is GPS positioning signal according to signal structure.
The signal structure of signal can reflect the identity information of signal indirectly.
The GPS positioning signal that GPS satellite is emitted can be divided into from structure：Carrier wave, pseudo-code and numeric data code；Wherein, pseudo-
Code is added with numeric data code exclusive or and realizes spread spectrum, and then combination code passes through BPSK again and is modulated to carrier wave, then defends
Star blazes abroad modulated carrier signal, carries out demodulation localization process after being received by terminal GPS antenna.
Identified by the signal structure to signal, if the signal structure identified be carrier wave, pseudo-code and numeric data code,
It can determine that signal is GPS positioning signal.
In one embodiment, S201-S202 obtains the signal identification feature of signal；Judged according to signal identification feature
Whether signal is that GPS positioning signal includes：
Obtain the identity information that signal carries；
Judge whether signal is GPS positioning signal according to identity information.
GPS satellite increases in GPS positioning signal for showing GPS positioning signal identity when generating GPS positioning signal
Information, be then transmitted to the GPS antenna of terminal again；If having identified and having taken in the signal that the GPS antenna of terminal receives
Band then may determine that the signal that GPS antenna receives is GPS positioning signal for showing the information of GPS positioning signal identity；
In LTE signal, the information for showing LTE signal identity can also be carried, if the letter that the GPS antenna of terminal receives
In number, the information carried for showing LTE signal identity is identified, then may determine that the signal that GPS antenna receives is LTE
Signal.
S203：Signal is received using signal as effective；
Optionally, S203 using signal as it is effective receive signal after, it is further comprising the steps of：Signal is solved
It adjusts, and GPS positioning processing is carried out according to the signal after demodulation.
When the signal for judging that GPS antenna receives is GPS positioning signal, by RF transceiver to GPS positioning signal
Carry out demodulation localization process.
S204：Signal is interference signal, and using signal as invalid receiver signal.
When the signal for judging that GPS antenna receives is not GPS positioning signal, then it can be determined that the signal is to GPS
The interference signal of antenna is filtered out using the signal as invalid receiver signal；It is carried out in the signal received to GPS antenna
Before demodulation, first judge whether the signal that GPS antenna receives is GPS positioning signal, if so, just carrying out to it at demodulation positioning
Reason, if it is not, the problem of then first being filtered out, being substantially improved for a long time to GPS positioning signal interference, it is fixed to improve GPS
Position performance.
In the prior art, aiming at the problem that LTE-B13 signal interferes GPS antenna, there is proposition following solution：Ginseng
See that Fig. 3, Fig. 3 are the schematic diagram of a kind of GPS circuitry design that the prior art provides and the design of primary antenna transmission circuit, for
The problem of LTE-B13 signal interferes GPS antenna, current solution are additionally increased in the transmitting path of LTE-B13 signal
Add a filter, filters out multiplied frequency harmonic.But such mode undoubtedly increases device cost, also occupies the face of terminal pcb board
Product, it is also necessary to additional matching and debugging.
In Fig. 3, RF transceiver includes GPS module and primary antenna transceiver module, the signal that GPS antenna receives according to
It is secondary after wave filter, low-noise amplifier and filter, into RF transceiver, by the GPS module of RF transceiver
It is handled；LTE signal is after amplifier, duplexer, filter (for filtering out LTE-B13 signal), duplexer, by leading
Antenna is launched.
In contrast, it in the scheme of the present embodiment, without increasing hardware module, is directly realized by software algorithm
The step of S201-S204, eliminates the addition of filter circuit, reduces Material Cost, saves PCB surface product, and it is permanent to substantially improve
Since LTE-B13 signal to the interference problem of GPS positioning signal, improve GPS positioning performance, the user experience is improved.
By the implementation of the present embodiment, after the GPS antenna of terminal receives signal, first judge whether signal is GPS
Positioning signal, when the signal received is GPS positioning signal, just as effectively reception signal；It is not in the signal received
When GPS positioning signal, then signal is interference signal, and using signal as invalid receiver signal；It substantially improves for a long time to GPS
The problem of positioning signal is interfered, improves GPS positioning performance, the user experience is improved.
Fourth embodiment
In order to solve in the prior art, the GPS positioning signal that GPS antenna receives in terminal will receive the dry of other signals
The problem of disturbing, leading to GPS receiver degradation, it is computer-readable to deposit the present embodiment provides a kind of computer readable storage medium
Storage media is stored with one or more program, one or more program can be executed by one or more processor, with reality
In existing first embodiment, second embodiment the step of terminal positioning interference filtering method.
With processor 501 for executing the one or more programs stored in memory 502, to realize in first embodiment
For the step of terminal positioning interference filtering method, realization following steps are specifically included：
S201：After the GPS antenna of terminal receives signal, the signal identification feature of signal is obtained；
Optionally, when terminal opens GPS positioning function under LTE-B13 communications status, the step of S201 can be entered
Suddenly, because being the interference from LTE-B13 signal to the interference of GPS antenna one of the most common type.Alternatively, as long as terminal opens
GPS positioning function, can enter S201 the step of because interference signal is other than being LTE-B13 signal, it is also possible to its
The interference signal of his type.
In order to know that the signal that the GPS antenna of terminal receives is GPS positioning signal or interference signal, in GPS antenna
After receiving signal, signal is not demodulated directly, before demodulation, the signal identification for first obtaining signal is special
Sign, the effect of signal identification feature are：According to signal identification feature, the identity information of signal is determined, namely determine signal
It is GPS positioning signal or interference signal.
S202：Judge whether signal is GPS positioning signal according to signal identification feature；If so, then entering S203；If not,
Then enter S204；
Signal identification feature is to be able to reflect the information of signal identity, wherein the signal identification feature of signal is signal
Messaging parameter, perhaps for signal carry identity information or be the signal structure etc. of signal, however it is not limited to above-mentioned 3 kinds
Mode；
That is, in one embodiment, S201-S202 obtains the signal identification feature of signal；According to signal identification spy
Sign judges whether signal is that GPS positioning signal includes：
Obtain the messaging parameter of signal；
Judge whether signal is GPS positioning signal according to messaging parameter.
The messaging parameter of signal can reflect the identity information of signal indirectly.
Optionally, messaging parameter includes the modulation system etc. of signal.The modulation system of signal includes BPSK modulation, QPSK tune
System, QAM modulation etc..
Optionally, the messaging parameter for obtaining signal includes following three steps：
The first step：Obtain the subsignal in signal；
Wherein, the subsignal in acquisition signal includes：
Any one segment signal in replica signal, as subsignal.
Second step：Sub-signal is demodulated；
Third step：According to demodulation result, the modulation system of signal is obtained.
Sub-signal is demodulated, and the modulation system of subsignal, the modulation methods of subsignal can be learnt according to demodulation result
Formula is the modulation system of signal；One signal has multiple subsignals, and a signal, modulation system is substantially only a kind of,
So the modulation system got according to demodulation result is all identical if demodulating to multiple subsignals in signal, and
It is identical as the modulation system of signal.
Above three step is the equal of first carrying out pre-demodulating processing to signal, from the result that pre-demodulating is handled, obtains
To the modulation system of signal.
Optionally, judge whether signal is that GPS positioning signal includes according to messaging parameter：
When modulation system is the spread spectrum BPSK modulation based on CDMA technology, then judge signal for GPS positioning signal；
The modulation system of GPS positioning signal is the spread spectrum BPSK modulation based on CDMA technology；
When modulation system is QPSK modulation or QAM modulation based on FDMA technology, then judge signal for interference signal；
The modulation system of LTE-B13 signal is QPSK modulation or QAM modulation based on FDMA technology.
For FDD-LTE by the way of frequency division, two independent channels are transmitted and are passed up downwards respectively information
Technology.The chief technology of FDD-LTE has OFDM technology, and the data flow of high speed is decomposed into multidiameter delay low rate data streams,
It is transmitted simultaneously over a number of carriers.
So GPS positioning signal is different with the modulation system of LTE-B13 signal, then can be modulated before signal demodulation
The identification of the modulation system of signal, by carrying out pre-demodulating processing to reception signal, thus judge the modulation system of signal, into
And to carry out the judgement of interference signal.
In one embodiment, S201-S202 obtains the signal identification feature of signal；Judged according to signal identification feature
Whether signal is that GPS positioning signal includes：
Obtain the signal structure of signal；
Judge whether signal is GPS positioning signal according to signal structure.
The signal structure of signal can reflect the identity information of signal indirectly.
The GPS positioning signal that GPS satellite is emitted can be divided into from structure：Carrier wave, pseudo-code and numeric data code；Wherein, pseudo-
Code is added with numeric data code exclusive or and realizes spread spectrum, and then combination code passes through BPSK again and is modulated to carrier wave, then defends
Star blazes abroad modulated carrier signal, carries out demodulation localization process after being received by terminal GPS antenna.
Identified by the signal structure to signal, if the signal structure identified be carrier wave, pseudo-code and numeric data code,
It can determine that signal is GPS positioning signal.
In one embodiment, S201-S202 obtains the signal identification feature of signal；Judged according to signal identification feature
Whether signal is that GPS positioning signal includes：
Obtain the identity information that signal carries；
Judge whether signal is GPS positioning signal according to identity information.
GPS satellite increases in GPS positioning signal for showing GPS positioning signal identity when generating GPS positioning signal
Information, be then transmitted to the GPS antenna of terminal again；If having identified and having taken in the signal that the GPS antenna of terminal receives
Band then may determine that the signal that GPS antenna receives is GPS positioning signal for showing the information of GPS positioning signal identity；
In LTE signal, the information for showing LTE signal identity can also be carried, if the letter that the GPS antenna of terminal receives
In number, the information carried for showing LTE signal identity is identified, then may determine that the signal that GPS antenna receives is LTE
Signal.
S203：Signal is received using signal as effective；
Optionally, S203 using signal as it is effective receive signal after, it is further comprising the steps of：Signal is solved
It adjusts, and GPS positioning processing is carried out according to the signal after demodulation.
When the signal for judging that GPS antenna receives is GPS positioning signal, by RF transceiver to GPS positioning signal
Carry out demodulation localization process.
S204：Signal is interference signal, and using signal as invalid receiver signal.
When the signal for judging that GPS antenna receives is not GPS positioning signal, then it can be determined that the signal is to GPS
The interference signal of antenna is filtered out using the signal as invalid receiver signal；It is carried out in the signal received to GPS antenna
Before demodulation, first judge whether the signal that GPS antenna receives is GPS positioning signal, if so, just carrying out to it at demodulation positioning
Reason, if it is not, the problem of then first being filtered out, being substantially improved for a long time to GPS positioning signal interference, it is fixed to improve GPS
Position performance.
In the prior art, aiming at the problem that LTE-B13 signal interferes GPS antenna, there is proposition following solution：Ginseng
See that Fig. 3, Fig. 3 are the schematic diagram of a kind of GPS circuitry design that the prior art provides and the design of primary antenna transmission circuit, for
The problem of LTE-B13 signal interferes GPS antenna, current solution are additionally increased in the transmitting path of LTE-B13 signal
Add a filter, filters out multiplied frequency harmonic.But such mode undoubtedly increases device cost, also occupies the face of terminal pcb board
Product, it is also necessary to additional matching and debugging.
In Fig. 3, RF transceiver includes GPS module and primary antenna transceiver module, the signal that GPS antenna receives according to
It is secondary after wave filter, low-noise amplifier and filter, into RF transceiver, by the GPS module of RF transceiver
It is handled；LTE signal is after amplifier, duplexer, filter (for filtering out LTE-B13 signal), duplexer, by leading
Antenna is launched.
In contrast, it in the scheme of the present embodiment, without increasing hardware module, is directly realized by software algorithm
The step of S201-S204, eliminates the addition of filter circuit, reduces Material Cost, saves PCB surface product, and it is permanent to substantially improve
Since LTE-B13 signal to the interference problem of GPS positioning signal, improve GPS positioning performance, the user experience is improved.
By the implementation of the present embodiment, after the GPS antenna of terminal receives signal, first judge whether signal is GPS
Positioning signal, when the signal received is GPS positioning signal, just as effectively reception signal；It is not in the signal received
When GPS positioning signal, then signal is interference signal, and using signal as invalid receiver signal；It substantially improves for a long time to GPS
The problem of positioning signal is interfered, improves GPS positioning performance, the user experience is improved.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the device that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or device institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or device.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art
The part contributed out can be embodied in the form of software products, which is stored in a storage medium
In (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that a terminal device (can be mobile phone, computer, clothes
Be engaged in device, air conditioner or the network equipment etc.) method that executes each embodiment of the present invention.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of terminal positioning interference filtering method, which is characterized in that the terminal positioning interference filtering method includes following step
Suddenly：
After the GPS antenna of terminal receives signal, the signal identification feature of the signal is obtained；
Judge whether the signal is GPS positioning signal according to the signal identification feature；
If so, then receiving signal using the signal as effective；
If not, the signal is interference signal, and using the signal as invalid receiver signal.
2. terminal positioning interference filtering method as described in claim 1, which is characterized in that the signal for obtaining the signal
Identification feature；Judge whether the signal is that GPS positioning signal includes according to the signal identification feature：
Obtain the messaging parameter of the signal；
Judge whether the signal is GPS positioning signal according to the messaging parameter.
3. terminal positioning interference filtering method as claimed in claim 2, which is characterized in that the messaging parameter includes the letter
Number modulation system.
4. terminal positioning interference filtering method as claimed in claim 3, which is characterized in that the communication for obtaining the signal
Parameter includes：
Obtain the subsignal in the signal；
The subsignal is demodulated；
According to demodulation result, the modulation system of the signal is obtained.
5. terminal positioning interference filtering method as claimed in claim 4, which is characterized in that described to be sentenced according to the messaging parameter
Whether the signal that breaks is that GPS positioning signal includes：
When the modulation system is the spread spectrum binary phase shift keying modulation based on Code Division Multiple Access, then the signal is judged
For GPS positioning signal；
When the modulation system is quadrature phase shift keying modulation or quadrature amplitude modulation based on frequency division multiple access technology, then judge
The signal is interference signal.
6. terminal positioning interference filtering method as described in claim 1, which is characterized in that the signal for obtaining the signal
Identification feature；Judge whether the signal is that GPS positioning signal includes according to the signal identification feature：
Obtain the signal structure of the signal；
Judge whether the signal is GPS positioning signal according to the signal structure.
7. terminal positioning interference filtering method as described in claim 1, which is characterized in that the signal for obtaining the signal
Identification feature；Judge whether the signal is that GPS positioning signal includes according to the signal identification feature：
Obtain the identity information that the signal carries；
Judge whether the signal is GPS positioning signal according to the identity information.
8. terminal positioning interference filtering method as described in any one of claim 1 to 7, which is characterized in that it is described will be described
It is further comprising the steps of after signal is as effectively signal is received：The signal is demodulated, and according to the signal after demodulation
Carry out GPS positioning processing.
9. a kind of terminal, which is characterized in that the terminal includes processor, memory and communication bus；
The communication bus is for realizing the connection communication between the processor and the memory；
The processor is for executing one or more program stored in the memory, to realize such as claim 1 to 8
Any one of described in terminal positioning interference filtering method the step of.
10. a kind of computer readable storage medium, which is characterized in that the computer-readable recording medium storage have one or
Multiple programs, one or more of programs can be executed by one or more processor, to realize such as claim 1 to 8
Any one of described in terminal positioning interference filtering method the step of.
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| CN112444827A (en) * | 2019-09-05 | 2021-03-05 | Oppo广东移动通信有限公司 | Electronic device, positioning control method, and computer-readable storage medium |
| RU2796444C1 (en) * | 2022-04-19 | 2023-05-23 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Рязанский государственный радиотехнический университет имени В.Ф. Уткина" | Interference filter |
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