CN117560067A - Mobile phone direct-connection satellite terminal positioning system - Google Patents
Mobile phone direct-connection satellite terminal positioning system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18545—Arrangements for managing station mobility, i.e. for station registration or localisation
- H04B7/18547—Arrangements for managing station mobility, i.e. for station registration or localisation for geolocalisation of a station
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18502—Airborne stations
- H04B7/18504—Aircraft used as relay or high altitude atmospheric platform
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- H—ELECTRICITY
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- H04B7/00—Radio transmission systems, i.e. using radiation field
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- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18502—Airborne stations
- H04B7/18506—Communications with or from aircraft, i.e. aeronautical mobile service
- H04B7/18508—Communications with or from aircraft, i.e. aeronautical mobile service with satellite system used as relay, i.e. aeronautical mobile satellite service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/06—Airborne or Satellite Networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The embodiment of the invention discloses a mobile phone direct-connection satellite terminal positioning system, which comprises: the system comprises an unmanned plane, an airborne signal acquisition device and a ground operation device; the unmanned aerial vehicle is used for carrying the airborne signal acquisition device to lift off; the machine-mounted signal acquisition device is used for acquiring a target signal, after the target signal is digitized, wireless communication is transmitted to the ground operation device, and the ground operation device is used for further processing the digital signal; the ground operation device is used for determining the positioning of the mobile phone direct-connection satellite terminal to be tested according to the digital signal. According to the positioning system provided by the embodiment of the invention, the generation of multipath effect can be effectively eliminated on the basis of the aerial platform for unmanned aerial vehicle lift-off detection, so that the direction finding of a target source can be more stable, and the positioning precision is higher. Because the unmanned aerial vehicle can fly in the air, single-station time-sharing direction finding and positioning can be realized, the complexity of a positioning system is reduced, and the method is easier to realize technically.
Description
Technical Field
The invention relates to the field of positioning in the field of radio monitoring, in particular to a mobile phone direct-connection satellite terminal positioning system.
Background
In recent years, the mobile phone direct-connection satellite technology is only a novel satellite communication technology and has started to rise in the global scope. The mobile phone direct-connection satellite terminal essentially belongs to a type of satellite ground station, but the mobile phone direct-connection satellite terminal generally uses a non-directional antenna. The frequency band used in the future may be similar to the frequency band of public mobile communication. The characteristics can be utilized to carry out direction finding and positioning on the radio monitoring network with the existing ultrashort wave frequency band. Because the transmitting power of the mobile phone direct-connected satellite terminal is smaller, the used frequency band is higher, so that the path loss is larger, a complex multipath effect exists in a complex urban environment, the direction-finding deviation is larger, the positioning error is larger, and finally, the long-time manual search and measurement are required to be performed in a suspected area of an interference source manually, so that the efficiency is low. The positioning and checking technology for the mobile phone direct-connection satellite terminal interfering with normal communication is a technical problem to be solved in the field of radio monitoring.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a mobile phone direct-connection satellite terminal positioning system so as to solve the technical problem of the existing positioning checking technology of the mobile phone direct-connection satellite terminal interfering normal communication.
In order to solve the above technical problems, an embodiment of the present invention provides a mobile phone direct-connected satellite terminal positioning system, including: the system comprises an unmanned plane, an airborne signal acquisition device and a ground operation device; wherein,
the unmanned aerial vehicle is used for carrying the airborne signal acquisition device to lift off;
the machine-mounted signal acquisition device is used for acquiring a target signal, after the target signal is digitized, wireless communication is transmitted to the ground operation device, and the ground operation device is used for further processing the digital signal;
the ground operation device is used for determining the positioning of the mobile phone direct-connection satellite terminal to be tested according to the digital signal.
Optionally, the airborne signal acquisition device includes: the system comprises an airborne acquisition unit, a first wireless transmission module, a detection antenna, a cradle head, an electronic compass, a replaceable satellite uplink signal receiver, an AD module, a control module, a GPS module and a first wireless transmission module.
Optionally, the detecting antenna comprises an omnidirectional antenna and a directional antenna which are configured with a target frequency band, and each pair of the omnidirectional antenna and the directional antenna is used for matching with different interference sources for checking application; the antenna comprises an eight-mesh antenna.
Optionally, the AD module is configured to collect satellite uplink signals in multiple modes; if the AD module is collected in a spectrum monitoring mode, the AD module works in a broadband mode; if the target signal is determined to be in the determined area, the AD module adopts a narrow-band working mode, and the incoming wave direction is determined by a mechanical scanning signal amplitude comparison method.
The airborne acquisition unit comprises: the system comprises an airborne comprehensive information processing module, an acquisition card module, an ADC module and an airborne memory; wherein,
the onboard comprehensive information processing module is used for sending a data acquisition instruction to the acquisition card module; the acquisition card module comprises two acquisition cards, and the two acquisition cards respectively correspond to the I-path sampling and the Q-path sampling; the two acquisition cards synchronously sample under the control of a time system signal;
the ADC module is used for obtaining a digital signal after data sampling, and performing down-conversion on the signal to zero frequency in a digital domain to change the signal into a baseband signal;
the onboard memory is used for storing the baseband digital signals;
the control module is used for packaging the data in the memory into a data packet and transmitting the data to the ground operation device through the first wireless transmission module.
Optionally, the airborne signal acquisition device further comprises an anti-falling parachute bag, and the anti-falling parachute bag is used for popping up the parachute for self-rescue when the unmanned aerial vehicle is out of control or other unexpected conditions cause crash.
Optionally, the ground operation device comprises a second wireless communication module, a positioning module and a map display module.
Optionally, the ground working device further comprises: the flight control module and the satellite uplink signal checking device; wherein,
the flight control module is used for controlling the unmanned aerial vehicle to realize various flight actions.
The satellite uplink signal checking device is used for providing a user operation interface, controlling the normal operation of the airborne signal acquisition device, calibrating a direction finding result and drawing the direction finding result on a map.
Optionally, the satellite uplink signal checking device includes: the system comprises a flow management module, a data acquisition module, a frequency spectrum display module, a direction finding module and an operation report generation module; wherein,
the flow management module is used for scheduling and coordinating the work of each module;
the data acquisition module is used for operating an acquisition card, operating the airborne signal acquisition device according to the parameters distributed by the flow management module, acquiring uplink frequency points with high precision, receiving and sending the uplink frequency points into a memory for analysis by the direction finding module;
the frequency spectrum display module is used for displaying the signals counted by the acquisition card in the form of a frequency spectrometer interface;
the direction finding module is used for carrying out power calculation on the collected satellite uplink signals, and matching the power values with the directional values of all the antennas to obtain the maximum power incoming wave direction;
and the job report generation module is used for recording important information of one stage of task to form a job report.
Optionally, the first wireless communication module or the second wireless communication module includes: at least one of a WiFi module, a 4G module and a 5G module.
According to the positioning system provided by the embodiment of the invention, the generation of multipath effect can be effectively eliminated on the basis of the aerial platform for unmanned aerial vehicle lift-off detection, so that the direction finding of a target source can be more stable, and the positioning precision is higher. Because the unmanned aerial vehicle can fly in the air, single-station time-sharing direction finding and positioning can be realized, the complexity of a positioning system is reduced, and the method is easier to realize technically.
Drawings
Fig. 1 is a schematic diagram of a mobile phone direct-connection satellite terminal positioning system frame according to an embodiment of the invention.
Fig. 2 is a schematic workflow diagram of a mobile phone direct-connection satellite terminal positioning system according to an embodiment of the invention.
Fig. 3 is a schematic diagram of a simulation direction of an eight-mesh antenna according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a multi-station direction-finding positioning according to an embodiment of the present invention.
Detailed Description
It should be noted that, without conflict, the embodiments and features of the embodiments in the present application may be combined with each other, and the present invention will be further described in detail with reference to the drawings and the specific embodiments.
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In order to better understand the solution of the present application, the following description will make clear and complete descriptions of the technical solution of the embodiment of the present application with reference to the accompanying drawings in the embodiment of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. In the embodiments of the present application, it should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the description of embodiments of the present application, words such as "example" or "such as" are used to indicate exemplary, illustrative, or descriptive matter. Any embodiment or design described herein as "example" or "such as" is not necessarily to be construed as preferred or advantageous over another embodiment or design. The use of words such as "example" or "such as" is intended to present relative concepts in a clear manner.
In addition, the term "plurality" in the embodiments of the present application means two or more, and in view of this, the term "plurality" may be understood as "at least two" in the embodiments of the present application. "at least one" may be understood as one or more, for example as one, two or more. For example, including at least one means including one, two or more, and not limiting what is included, e.g., including at least one of A, B and C, then A, B, C, A and B, A and C, B and C, or A and B and C, may be included.
The embodiment of the application provides a mobile phone direct-connection satellite terminal positioning system, a frame diagram is shown in fig. 1, and the system comprises: unmanned aerial vehicle, airborne signal collection system, ground operation device.
The unmanned aerial vehicle is used for carrying the airborne signal acquisition device to lift off. It is to be appreciated that the drone may be off, flying, hovering, etc. along the ground working device route. Preferably, the unmanned aerial vehicle can adopt a six-rotor unmanned aerial vehicle, the maximum effective load can reach 10 kg, and the unmanned aerial vehicle can hover in the air and fly for 5 minutes under the maximum effective load.
The machine-mounted signal acquisition device is used for acquiring a target signal, after the target signal is digitized, wireless communication is transmitted to the ground operation device, and the ground operation device is used for further processing the digital signal.
The ground operation device is used for determining the positioning of the mobile phone direct-connection satellite terminal to be tested according to the digital signal.
According to the positioning system provided by the embodiment of the invention, the generation of multipath effect can be effectively eliminated on the basis of the high-altitude platform for the unmanned aerial vehicle lift-off detection, the direction finding of a target source can be more stable, the positioning precision is higher, the single-station time-sharing direction finding positioning can be realized due to the characteristic that the unmanned aerial vehicle can fly in the air, the complexity of the positioning system is reduced, and the positioning system is easier to realize technically.
In some embodiments, optionally, the on-board signal acquisition device includes: the system comprises an airborne acquisition unit, a detection antenna, a cradle head, an electronic compass, a replaceable satellite uplink signal receiver, an AD module, a control module, a GPS module and a first wireless transmission module. Wherein,
the airborne acquisition unit comprises: the system comprises an airborne comprehensive information processing module, an acquisition card, an ADC module and an airborne memory. Wherein,
the onboard comprehensive information processing module is used for sending data acquisition instructions to the acquisition card module, and the acquisition card module comprises two acquisition cards which respectively correspond to the I-path sampling and the Q-path sampling. The two acquisition cards synchronously sample under the control of a timing signal. The input frequency of the acquisition card is (950-1450 MHz).
The ADC module is used for obtaining a digital signal after data sampling, and performing down-conversion on the signal to zero frequency in a digital domain to change the signal into a baseband signal.
The onboard memory is used for storing the baseband digital signals. The baseband digital signal has IQ two paths, and is transmitted to the onboard memory in a data frame mode, and is sequentially stored in the memory according to a time sequence.
The control module is also used for packaging the data in the memory into a data packet and transmitting the data to the ground operation device through the first wireless transmission module. It will be appreciated that the control module may also encapsulate GPS data, azimuth data, etc. into data packets.
The detection antenna comprises an omnidirectional antenna and a directional antenna which are configured with a target frequency band, and the omnidirectional antenna and the directional antenna are respectively used for being matched with different interference sources for checking application, and signals received by the detection antenna are sent to the satellite uplink signal receiver at the later stage. Preferably, the antenna comprises an eight-mesh antenna.
The cradle head is used for bearing the electronic compass and the directional antenna under the dispatching of the comprehensive information processing module, realizing the mechanical scanning of 360-degree azimuth angles, and carrying out signal acquisition and analysis in all directions in cooperation with the AD module so as to finish direction finding.
The electronic compass is used for providing accurate azimuth angle information for the mechanical scanning direction-finding work of the airborne signal acquisition device. Preferably, the electronic compass can adopt an anti-interference high-precision electronic compass.
The replaceable satellite uplink signal receiver is used for receiving satellite uplink signals. Preferably, in order to adapt to the checking of satellite interference sources in different frequency bands and strictly control the weight and the volume of radio frequency equipment, the scheme divides the frequency bands such as L, S, C, ku which need to be covered into a plurality of forwarding channels separated according to the frequency bands, and selects a forwarding module according to the frequency point of a target signal when specific interference occurs and loads the forwarding module on an unmanned aerial vehicle. The replaceable channelized forwarding module mainly comprises LNA (low-noise amplifier) and frequency converter of each frequency band.
The AD module is used for collecting satellite uplink signals in a multi-mode. The airborne signal acquisition device acquires uplink signals of satellites in a multi-mode. Specifically, if the acquisition is performed in a spectrum monitoring mode, the AD module works in a broadband mode; when the target signal is determined in the determined area, a narrow-band working mode is adopted, the incoming wave direction is determined by a mechanical scanning signal amplitude comparison method, and the AD module adopts the narrow-band working mode. The broadband acquisition equipment can greatly simplify the complexity of the radio frequency equipment and generally reduce the weight.
And the control module is used for controlling each module. Illustratively, the control module filters, packs and the like the signals obtained by the AD and sends the signals to the wireless transmission module; controlling the rotation of the cradle head to be matched with the AD to finish scanning work; it will be appreciated that the degree of the sensor of the GPS module, electronic compass module, etc. is also received and distributed by it.
And the GPS module is used for determining the position of the unmanned aerial vehicle in real time. Optionally, the GPS module may also provide a time unification function for acquisition.
The first wireless transmission module is used for carrying out wireless signal transmission with the ground operation device. The wireless signal includes: communication instructions, collected signals, etc. The first wireless transmission module may include at least one of a WiFi module, a 4G module, and a 5G module.
As an implementation mode, optionally, the airborne signal acquisition device may further include an anti-falling parachute bag, and the anti-falling parachute bag is used for popping up the parachute for self-rescue when the unmanned aerial vehicle is out of control or other unexpected situations cause crash.
As an embodiment, the workflow of the on-board signal acquisition device includes the following:
the airborne comprehensive information processing module sends a data acquisition instruction to acquisition, and the acquisition card module comprises two acquisition cards which respectively correspond to the I-path and the Q-path sampling. The two acquisition cards synchronously sample under the control of a timing signal. The input frequency of the acquisition card is (950-1450 MHz).
The ADC module samples the data to obtain a digital signal, and down-converts the signal to zero frequency in a digital domain to become a baseband signal.
The baseband digital signal has IQ two paths, and is transmitted to the onboard memory in a data frame mode, and is sequentially stored in the memory according to the time sequence.
The control module encapsulates the data in the memory, the GPS data and the azimuth data into a data packet, and transmits the data packet to the ground operation device through the wireless transmission module.
As one embodiment, the ground operation device comprises a second wireless communication module, a positioning module and a map display module.
The second wireless communication module is used for receiving the digital signals acquired by the on-board signal acquisition device of the unmanned aerial vehicle, and dynamically displaying the digital signals in the frequency spectrum block diagram after FFT conversion. The second wireless communication module can also be used for receiving wireless radio frequency signals of the downlink of the unmanned aerial vehicle and providing larger signal gain. It will be appreciated that the second wireless communication module may receive various signals and/or data from the drone and the on-board signal acquisition device, may send various signals and/or data and/or instructions to the drone and the on-board signal acquisition device, and the like. The second wireless transmission module may include at least one of a WiFi module, a 4G module, and a 5G module
The positioning module is used for calling map data through the map display module, drawing direction lines on a map according to the position information and the incoming wave direction information of the unmanned aerial vehicle, and meeting at the interference terminal according to the direction lines drawn at a plurality of different positions of the unmanned aerial vehicle, wherein the meeting point is the position of the mobile phone to be tested, which is directly connected with the satellite terminal. Preferably, the relevant information such as the action route, the direction finding line, the positioning intersection target point and the like can be visually displayed on the map.
As one embodiment, the ground working apparatus further includes: the system comprises a flight control module and satellite uplink signal checking equipment.
The flight control module is used for controlling the unmanned aerial vehicle to realize various flight actions.
The satellite uplink signal checking device is used for providing a user operation interface, controlling the normal operation of the airborne signal acquisition device, calibrating a direction finding result and drawing the direction finding result on a map.
Optionally, the satellite uplink signal checking device includes: the system comprises a flow management module, a data acquisition module, a frequency spectrum display module, a direction finding module and a job report generation module. Wherein,
and the flow management module is used for scheduling and coordinating the work of each software module. The task-oriented interference source terminal checking work operation procedure is clear through the centralized management work flow, and a new flow can be conveniently adjusted or established according to the business development.
The data acquisition module is used for operating the acquisition card, operating the airborne signal acquisition device according to the parameters distributed by the flow management module, carrying out high-precision acquisition on the uplink frequency point, receiving and sending the uplink frequency point into the memory, and analyzing the uplink frequency point by the direction finding module.
The frequency spectrum display module is used for displaying the signals counted by the acquisition card in the form of a frequency spectrum instrument interface so as to assist a user in analyzing the signals.
And the direction finding module is used for carrying out power calculation on the collected satellite uplink signals, and matching the power values with the directional values of all the antennas to obtain the maximum power incoming wave direction. Specifically, the direction-finding module performs power measurement according to the received data, and as the data information contains the pointing angle information of the directional antenna, the data collected in the 360-degree rotation process of the eight-mesh antenna is subjected to power comparison, and the direction with the strongest power is found.
The job report generation module is used for recording important information (such as a target signal frequency point, an action route, a direction finding line, a locating point and the like) of a stage task to form a job report.
Optionally, the satellite uplink signal checking device may further include a system device monitoring module, configured to monitor and set states and working conditions of each module.
As an implementation manner, in combination with user operation, as shown in the flow chart of fig. 2, the workflow of the mobile phone direct connection satellite terminal positioning system is as follows:
step 1: and selecting a proper radio frequency channel according to the frequency range of the target to be searched. The unmanned aerial vehicle is invariable in the output of signal acquisition equipment at the input value signal download of collection card. The input end of the acquisition card is a radio frequency link in the past, and the radio frequency links in different frequency bands are different. The radio frequency link comprises a receiving antenna, an LNA (low noise amplifier), and a frequency converter.
Step 2: searching a proper place, mounting the airborne signal acquisition device to the unmanned aerial vehicle, and lifting the unmanned aerial vehicle to 200 meters to hover under the control of the flight control module after the equipment self-checking works normally.
Step 3: the ground operation device sends an instruction to the airborne signal acquisition device, and the airborne information processing unit receives the working instruction of the ground operation device through the WiFi module and sets a frequency band to be searched and tested.
Step 4: the acquisition card works in a monitoring mode (a broadband mode is 500MHz in real time bandwidth), acquires the whole target frequency band signal, transmits data to the ground operation device through the wireless data transmission module, and displays broadband spectrum data in a spectrum block diagram in real time. The broadband acquisition mode requires a certain time for data transmission to the ground working device due to a large data volume. The data acquisition in the broadband mode is sampling acquisition over a time period, the acquisition time is 10ms each time, and the acquisition interval is 2s.
Step 5: and a ground operator judges whether a mobile phone direct-connection satellite signal exists in the target frequency band or not by setting a signal-to-noise ratio threshold in a mode of manually observing the frequency spectrum. If the signal to be searched exists, the frequency point and the bandwidth information are recorded.
Step 6: and the user sends the target frequency point and the bandwidth information to the airborne signal acquisition device through the ground operation device. And after receiving the frequency and bandwidth information of the target signal, the airborne signal acquisition device is switched to a direction finding mode.
Step 7: the unmanned aerial vehicle cloud platform driving motor rotates eight mesh antennas, sets up the angle of antenna pivoted at every turn, sets up the range of pivoted at every turn according to the requirement of direction finding precision, if need accurate direction finding degree, then will be at every turn antenna pivoted angle setting slightly, but 360 degrees angles of rotation can take longer. If the target is only roughly oriented, the angle setting per rotation of the antenna is larger. Exemplary, eight-mesh antenna simulation direction schematic is shown in fig. 3.
Step 8: the airborne acquisition card works in a direction finding mode. The acquisition card still uses 500MHz real-time bandwidth for acquisition, but the IQ data stream flowing out from the back end is a narrow-band data stream after passing through a digital filter, and the bandwidth is slightly larger than the target signal bandwidth. The data is transmitted to the surface working device through the radio transmission module. The acquisition card performs equal-time acquisition at each azimuth angle through which the antenna passes.
Step 9: and carrying out frame sealing transmission on the acquired data, wherein each frame of data comprises the data of the signal and azimuth information of the antenna at the corresponding moment. After the antenna rotates 360 degrees, the airborne signal acquisition device sends an instruction of finishing acquisition to the ground operation device. The broadband acquisition card is to adopt a multiphase acquisition technology to realize real-time acquisition of 500MHz bandwidth. Sampling under different phase clock driving is carried out on input signals by using two AD channels, collected data flows into the FPGA through a high-speed data interface, and digital signals of two phases are integrated in the FPGA. A buffer RAM is provided as a buffer for the output of the high-speed digital signal. After the signal data are integrated and packaged in corresponding frames, the signal data are sent to a subsequent WIFI module and converted into wireless signals to be radiated.
Step 10: the ground operation device receives the data transmitted by the on-board signal acquisition device. And after receiving the instruction of the airborne signal acquisition device, stopping receiving the data by the ground operation device. And carrying out power measurement on the data carrying the direction information.
Step 11: the ground operation device can display the power value of 360 degrees on the display dial, automatically calculate the maximum azimuth of the power according to the power value, and record the azimuth as the incoming wave direction.
Step 12: the ground operation device calls a map display module, and draws a direction finding line on a map according to the obtained direction finding data and GPS information of the unmanned aerial vehicle.
Step 13: the ground operation device sends out an instruction, and the unmanned aerial vehicle flies to the next place to hover. Repeating steps 5-12.
Step 14: the ground operation device displays 3 or more direction lines on the map and then performs intersection processing. The intersection area of the three direction-finding lines is the positioning area of the mobile phone direct-connection satellite terminal to be tested. As illustrated by way of example in fig. 4.
The positioning system provided by the embodiment of the invention adopts the unmanned aerial vehicle carrying device lift-off technology, can hover at 200 meters high altitude, can theoretically detect radio emission signals beyond at least 4 km, and has a signal monitoring distance far longer than that of a traditional ground radio monitoring base station; the yagi antenna with strong directivity rotates for 360 degrees, the incoming wave direction is judged according to the received power in each direction, and compared with a correlation interferometer or a spatial spectrum estimation direction-finding system which are frequently used by a fixed monitoring station, the device is greatly simplified, and the economic cost is greatly reduced; a set of light monitoring module is designed, so that the load weight of the unmanned aerial vehicle is greatly reduced, the dead time of the unmanned aerial vehicle is effectively prolonged, and the positioning success rate can be improved.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and are not limiting. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the appended claims. It will be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described herein in detail, many other variations or modifications which are in accordance with the principles of the invention may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and appreciated to cover all such other variations or modifications.
Claims (10)
1. A mobile phone direct-connection satellite terminal positioning system is characterized by comprising: the system comprises an unmanned plane, an airborne signal acquisition device and a ground operation device; wherein,
the unmanned aerial vehicle is used for carrying the airborne signal acquisition device to lift off;
the machine-mounted signal acquisition device is used for acquiring a target signal, after the target signal is digitized, wireless communication is transmitted to the ground operation device, and the ground operation device is used for further processing the digital signal;
the ground operation device is used for determining the positioning of the mobile phone direct-connection satellite terminal to be tested according to the digital signal.
2. The positioning system of claim 1 wherein said on-board signal acquisition device comprises: the system comprises an airborne acquisition unit, a first wireless transmission module, a detection antenna, a cradle head, an electronic compass, a replaceable satellite uplink signal receiver, an AD module, a control module and a GPS module.
3. The positioning system of claim 2 wherein said probe antennas comprise a pair of omni-directional and directional antennas configured for target frequency bands for use with different interference source verification applications; the antenna comprises an eight-mesh antenna.
4. The positioning system of claim 2, wherein the AD module is configured to collect satellite uplink signals in multiple modes; if the AD module is collected in a spectrum monitoring mode, the AD module works in a broadband mode; if the target signal is determined to be in the determined area, the AD module adopts a narrow-band working mode, and the incoming wave direction is determined by a mechanical scanning signal amplitude comparison method.
5. The positioning system of claim 2, wherein the on-board acquisition unit comprises: the system comprises an airborne comprehensive information processing module, an acquisition card module, an ADC module and an airborne memory; wherein,
the onboard comprehensive information processing module is used for sending a data acquisition instruction to the acquisition card module; the acquisition card module comprises two acquisition cards, and the two acquisition cards respectively correspond to the I-path sampling and the Q-path sampling; the two acquisition cards synchronously sample under the control of a time system signal;
the ADC module is used for obtaining a digital signal after data sampling, and performing down-conversion on the signal to zero frequency in a digital domain to change the signal into a baseband signal;
the onboard memory is used for storing the baseband digital signals;
the control module is used for packaging the data in the memory into a data packet and transmitting the data to the ground operation device through the first wireless transmission module.
6. The positioning system of claim 5, wherein said on-board signal acquisition device further comprises a fall protection umbrella bag for ejecting a parachute for self rescue when a crash is caused by an out of control or other unexpected condition of said unmanned aerial vehicle.
7. The positioning system of claim 1, wherein the ground working device comprises a second wireless communication module, a positioning module, and a map display module.
8. The positioning system of claim 7 wherein the ground working device further comprises: the flight control module and the satellite uplink signal checking device; wherein,
the flight control module is used for controlling the unmanned aerial vehicle to realize various flight actions;
the satellite uplink signal checking device is used for providing a user operation interface, controlling the normal operation of the airborne signal acquisition device, calibrating a direction finding result and drawing the direction finding result on a map.
9. The positioning system of claim 8 wherein said satellite uplink signal checking device comprises: the system comprises a flow management module, a data acquisition module, a frequency spectrum display module, a direction finding module and an operation report generation module; wherein,
the flow management module is used for scheduling and coordinating the work of each module;
the data acquisition module is used for operating an acquisition card, operating the airborne signal acquisition device according to the parameters distributed by the flow management module, acquiring uplink frequency points with high precision, receiving and sending the uplink frequency points into a memory for analysis by the direction finding module;
the frequency spectrum display module is used for displaying the signals counted by the acquisition card in the form of a frequency spectrometer interface;
the direction finding module is used for carrying out power calculation on the collected satellite uplink signals, and matching the power values with the directional values of all the antennas to obtain the maximum power incoming wave direction;
and the job report generation module is used for recording important information of one stage of task to form a job report.
10. The positioning system of claim 7 wherein said second wireless communication module comprises: at least one of a WiFi module, a 4G module and a 5G module.
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