CN112865888A - Passive online electronic density identification system and method and electronic equipment - Google Patents
Passive online electronic density identification system and method and electronic equipment Download PDFInfo
- Publication number
- CN112865888A CN112865888A CN202110027687.8A CN202110027687A CN112865888A CN 112865888 A CN112865888 A CN 112865888A CN 202110027687 A CN202110027687 A CN 202110027687A CN 112865888 A CN112865888 A CN 112865888A
- Authority
- CN
- China
- Prior art keywords
- signal
- electron density
- reference signal
- information
- transmission
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Plasma Technology (AREA)
- Transmitters (AREA)
Abstract
The embodiment of the invention provides a passive online electronic density identification system, a passive online electronic density identification method and electronic equipment, wherein the system comprises: a receiving antenna, a coupler and an identification receiver; the receiving antenna and the existing transmitting antenna are arranged on the inner side of the aircraft shell in a staggered mode and used for receiving the transmission signals radiated from the transmitting antenna; the coupler couples out a signal of an existing transmission path and sends the signal to the identification receiver as a reference signal; the identification receiver is used for receiving a reference signal and a transmission signal and calculating electron density information according to the reference signal and the transmission signal. The transmission signal of the invention is obtained after the signal sent by the transmitting antenna from the existing transmitter (such as a telemetering transmitter and the like) passes through the plasma sheath, and the information change of the signal amplitude, the signal phase and the like is extracted from the received reference signal and the transmission signal and is used for estimating the electron density of the area between the receiving antenna and the transmitting antenna.
Description
Technical Field
The present invention relates to the field of measurement technologies, and in particular, to a passive online electronic density identification system, method, and electronic device.
Background
The communication blackout is a technical problem faced by reentry aircrafts such as manned airships and the like, and accurate estimation of a plasma sheath on the surface of the aircraft has important guiding significance for selection of a measurement and control communication system of the aircraft and evaluation of target characteristics. And the electron density is the most central parameter of the sheath of the plasma, so that the online accurate estimation has great significance in practical application.
In the prior art, the electron density estimation method mainly comprises an aircraft flush probe method, a microwave reflection method and a ground inversion method. The measuring range of the flush probe method can be limited to a small area of the probe; the ground inversion method can only estimate afterwards and is influenced by weather and ground equipment calibration, only some sections can be measured due to limited ground stations and excessive error links, and errors cannot be decoupled; the microwave reflection method needs a radiation source and a receiving and transmitting antenna, and has large requirements on space.
Therefore, how to better realize electron density measurement has become an urgent problem to be solved in the industry.
Disclosure of Invention
Embodiments of the present invention provide a passive online electronic density identification system, method and electronic device, so as to solve the technical problems mentioned in the above background art, or at least partially solve the technical problems mentioned in the above background art.
In a first aspect, an embodiment of the present invention provides a passive online electron density identification system, including: a receiving antenna, a coupler and an identification receiver;
the receiving antenna and the existing transmitting antenna are arranged on the inner side of the aircraft shell in a staggered mode and used for receiving the transmission signals radiated from the transmitting antenna;
the coupler couples out a signal of an existing transmission path and sends the signal to the identification receiver as a reference signal;
the identification receiver is used for receiving a reference signal sent by an existing transmitter through a wired channel and a transmission signal sent by a wireless channel, and calculating electron density information according to the reference signal and the transmission signal.
More specifically, the identification receiver specifically includes: the system comprises a radio frequency front-end module, an intermediate frequency processing module and a digital processing module;
the radio frequency front end module is used for filtering, amplifying and frequency-converting a reference signal and a transmission signal to an intermediate frequency, and then outputting the intermediate frequency signal of the reference signal and the intermediate frequency signal of the transmission signal to the intermediate frequency processing module;
the intermediate frequency processing module is used for digitizing, orthogonally downconverting an intermediate frequency signal of the reference signal and an intermediate frequency signal of the transmission signal to a baseband and outputting the baseband to the digital processing module;
the digital processing module is used for recovering the instantaneous amplitude of the reference signal and the instantaneous phase information of the reference signal from the digitized orthogonal down-conversion signal of the reference signal, and recovering the instantaneous amplitude of the transmission signal and the instantaneous phase information of the transmission signal from the digitized orthogonal down-conversion signal of the transmission signal; the electron density information is calculated based on the instantaneous amplitude of the reference signal, the instantaneous phase information of the reference signal, the instantaneous amplitude of the transmission signal, and the instantaneous phase information of the transmission signal.
More specifically, the digital processing module is specifically configured to:
determining signal attenuation information from the instantaneous amplitude of the reference signal and the instantaneous amplitude of the transmitted signal;
determining signal phase difference information from the instantaneous phase information of the reference signal and the instantaneous phase information of the transmission signal;
determining a first average electron density according to the signal attenuation information, and determining a second average electron density according to the signal phase difference information;
and carrying out weighted average on the first average electron density and the second average electron density to obtain electron density information.
More specifically, the passive system also utilizes: existing transmitters and transmit antennas;
wherein the legacy transmitter is used to generate a source signal.
In a second aspect, an embodiment of the present invention provides an electronic density identification method based on the passive online electronic density identification system of the first aspect, including:
acquiring a transmission signal sent by a transmitting antenna and a reference signal coupled out by a transmitting channel;
determining signal attenuation information and signal phase difference information according to the transmission signal and the reference signal;
the electron density is determined from the signal attenuation information and the signal phase difference information.
More specifically, the step of determining signal attenuation information and signal phase difference information according to the transmission signal and the reference signal specifically includes:
performing digitization and down-conversion on the reference signal and the transmission signal to zero intermediate frequency to obtain a digitized orthogonal down-conversion signal of the reference signal and a digitized orthogonal down-conversion signal of the transmission signal;
recovering instantaneous amplitude of the reference signal and instantaneous phase information of the reference signal from a digitized quadrature down-conversion signal of the reference signal, and recovering instantaneous amplitude of the transmission signal and instantaneous phase information of the transmission signal from a digitized quadrature down-conversion signal of the transmission signal;
signal attenuation information is determined from the instantaneous amplitude of the reference signal and the instantaneous amplitude of the transmitted signal, and signal phase difference information is determined from the instantaneous phase information of the reference signal and the instantaneous phase information of the transmitted signal.
More specifically, the step of determining the electron density through the signal attenuation information and the signal phase difference information specifically includes:
determining a first average electron density according to the signal attenuation information, and determining a second average electron density according to the signal phase difference information;
and carrying out weighted average on the first average electron density and the second average electron density to obtain electron density information.
In a third aspect, an embodiment of the present invention provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the steps of the electron density recognition method according to the second aspect when executing the program.
In a fourth aspect, an embodiment of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the electron density recognition method according to the second aspect.
According to the passive online electron density identification system, method and electronic equipment provided by the embodiment of the invention, the receiving antenna and the coupler are arranged, so that the identification receiver can simultaneously receive the reference signal and the transmission signal, the transmission signal is obtained after the signal sent by the existing transmitting antenna passes through the plasma sheath, and the electron density of the region between receiving and transmitting is estimated according to the change of the information such as the signal amplitude, the signal phase and the like extracted from the received transmission signal. The invention utilizes the existing radiation sources of a measurement and control communication system and the like on the aircraft, measures the electron density of a local point relative to the probe, can estimate the average electron density of a region, has more practical value, and can not generate a local stagnation point caused by mismatching of the probe and the surface material of the aircraft; compared with the existing microwave reflection method, the method utilizes the existing radiation source (such as a measurement and control communication system), does not need to increase transmitting equipment or channels, reduces the risk of electromagnetic incompatibility, and saves the installation space in the aircraft; compared with the ground post-inversion method, although the method is used for radio signal estimation, the embodiment of the invention has less signal transmission links, can reduce the influence of space environment and equipment calibration to the maximum extent, and can realize the whole-process online measurement.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a passive online electron density identification system according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a passive online electron density identification method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a passive online electron density identification system according to an embodiment of the invention, as shown in fig. 1, including: a receiving antenna 110, a coupler 130, and an identification receiver 140, which system is also operable to utilize an existing transmitting antenna 120 and an existing transmitter 150;
wherein the receiving antenna 110 and the existing transmitting antenna 120 are arranged inside the aircraft shell in a staggered manner for receiving the transmitted signal radiated from the transmitting antenna;
wherein, the coupler 130 couples out the signal of the existing transmission path and transmits the signal to the identification receiver 140 as a reference signal;
the identification receiver 140 is configured to receive the reference signal generated by the coupler 130 and the transmission signal of the receiving antenna 110, and calculate the electron density information according to the reference signal and the transmission signal.
The coupler 130 of the embodiment of the present invention induces a reference signal from the transmission channel and transmits the reference signal to the identification receiver 140 through the channel Ch0, and the existing transmitter 150 transmits a signal to the existing transmitting antenna 120, and the signal passes through the plasma sheath, is received by the receiving antenna 110 to obtain a transmitted signal, and is transmitted to the identification receiver 140 through the channel Ch 1.
The misalignment of the receiving antenna and the transmitting antenna described in the embodiments of the present invention is mainly to ensure that the electromagnetic signal can travel a certain distance in the plasma sheath.
The transmission signal and the reference signal are both subjected to digital down-conversion to zero intermediate frequency to obtain respective orthogonal signals XIk、XQk(k＝0、1)。
Recovery of an instantaneous amplitude signal from a digitized quadrature downconverted signal identifying a transmitted signal and a reference signal in a receiver
Instantaneous phase signal
Reference signalAnd the instantaneous amplitude signal of the transmission signal are respectively denoted as A0、A1(ii) a The instantaneous phase signals of the reference signal and the transmission signal are respectively denoted as phi0、Φ1。
Calibrating according to the data of the reference signal which does not pass through the plasma sheath and the transmission signal which passes through the plasma sheath to obtain the attenuation information Att of the transmission signal and the signal phase difference information phid，
Assuming that the distance between the transmitting antenna and the receiving antenna is D, and the plasma between the transmitting antenna and the receiving antenna is stable and uniform for a short time, the attenuation equation of the signal passing through the plasma is
Att≈8.68αD
Where α is the attenuation coefficient of the electromagnetic signal in the plasma sheath, ω is the operating angular frequency of the electromagnetic wave, and ω is 2 π Fr，ωpFor the angular frequency of the sheath of the plasma,
Neis the electron density in the plasma sheath, v is the particle impact angular frequency of the plasma sheath, qeIs the charge of an electron, meIs the mass of an electron,. epsilon0Is the dielectric constant in vacuum, and c is the speed of light.
Shifting the center frequency point within the signal bandwidth by Fr+/-B/2, obtaining the attenuation equation of two frequency points to obtain omegapAnd upsilon, further a first average electron density can be obtained
The second mean electron density can also be determined by phase shift according to empirical formula
The final electron density is obtained by performing weighted average on the first average electron density and the second average electron density, wherein the weights are equal
The embodiment of the invention ensures that the identification receiver can simultaneously receive the reference signal and the transmission signal by arranging the receiving antenna and the coupler, the transmission signal is obtained after the reference signal sent by the transmitting antenna passes through the plasma sheath, the change of information such as signal amplitude, phase and the like extracted from the received transmission signal estimates the electron density of a region between receiving and transmitting, and the electron density of a local point is measured relative to the probe, the embodiment of the invention can estimate the average electron density of the region, and can not generate a local stationing point caused by mismatching of the probe and the surface material of the aircraft, compared with the existing microwave reflection method, the embodiment of the invention can reduce radiation source equipment, save the installation space in the aircraft, compared with a ground inversion method, although the radio signal estimation is adopted, the embodiment of the invention has less signal transmission links, and can furthest reduce the influence of the space environment, and full-range measurement can be realized.
On the basis of the foregoing embodiments, the identification receiver specifically includes: the system comprises a radio frequency front-end module, an intermediate frequency processing module and a digital processing module;
the radio frequency front end module is used for filtering, amplifying and frequency-converting a reference signal and a transmission signal to an intermediate frequency, and then outputting the intermediate frequency signal of the reference signal and the intermediate frequency signal of the transmission signal to the intermediate frequency processing module;
the intermediate frequency processing module is used for digitizing, orthogonally downconverting an intermediate frequency signal of the reference signal and an intermediate frequency signal of the transmission signal to a baseband and outputting the baseband to the digital processing module;
the digital processing module is used for recovering the instantaneous amplitude of the reference signal and the instantaneous phase information of the reference signal from the digitized orthogonal down-conversion signal of the reference signal, and recovering the instantaneous amplitude of the transmission signal and the instantaneous phase information of the transmission signal from the digitized orthogonal down-conversion signal of the transmission signal; the electron density information is calculated based on the instantaneous amplitude of the reference signal, the instantaneous phase information of the reference signal, the instantaneous amplitude of the transmission signal, and the instantaneous phase information of the transmission signal.
The identification receiver described in the embodiment of the invention takes a broadband software radio platform with a superheterodyne structure as a hardware platform, a radio frequency front-end module, an intermediate frequency processing module and a digital processing module.
The radio frequency front end module and the intermediate frequency processing module are used for carrying out digitization and down-conversion on the reference signal and the transmission signal to zero intermediate frequency to obtain a digitized orthogonal down-conversion signal of the reference signal and a digitized orthogonal down-conversion signal of the transmission signal, XIk、XQk(k＝0、1)。
On the basis of the above embodiment, the digital processing module is specifically configured to:
recovery of an instantaneous amplitude signal from a digitized quadrature downconverted signal identifying a transmitted signal and a reference signal in a receiver
Instantaneous phase signal
The instantaneous amplitude signals of the reference signal and the transmission signal are respectively denoted as A0、A1(ii) a The instantaneous phase signals of the reference signal and the transmission signal are respectively denoted as phi0、Φ1。
Determining signal attenuation information from the instantaneous amplitude of the reference signal and the instantaneous amplitude of the transmitted signal;
determining signal phase difference information from the instantaneous phase information of the reference signal and the instantaneous phase information of the transmission signal;
determining a first average electron density according to the signal attenuation information, and determining a second average electron density according to the signal phase difference information;
and carrying out weighted average on the first average electron density and the second average electron density to obtain electron density information.
The instantaneous phase information of the reference signal and the instantaneous phase information of the transmission signal are subtracted to obtain signal phase difference information phidAnd obtaining the signal attenuation information Att by calculating the difference between the instantaneous amplitude of the reference signal and the instantaneous amplitude of the transmission signal.
Assuming that the distance between the transmitting antenna and the receiving antenna is D, and the plasma between the transmitting antenna and the receiving antenna is stable and uniform for a short time, the attenuation equation of the signal passing through the plasma is
Att≈8.68αD
Where α is the attenuation coefficient of the electromagnetic signal in the plasma sheath, ω is the operating angular frequency of the electromagnetic wave, and ω is 2 π Fr，ωpFor the angular frequency of the sheath of the plasma,
Neis the electron density in the plasma sheath, v is the particle impact angular frequency of the plasma sheath, qeIs the charge of an electron, meIs the mass of an electron,. epsilon0Is the dielectric constant in vacuum, and c is the speed of light.
Shifting the center frequency point within the signal bandwidth by Fr+/-B/2, obtaining the attenuation equation of two frequency points to obtain omegapAnd upsilon, further a first average electron density can be obtained
The second mean electron density can also be determined by phase shift according to empirical formula
By taking into account the first and second average electron densitiesLine weighted average, where the weights are equal to obtain the final electron density
On the basis of the above embodiment, the passive system also utilizes an existing transmitter and an existing transmitting antenna during operation;
wherein the legacy transmitter is used to generate a source signal.
By arranging the receiving antenna and the coupler, the identification receiver can be ensured to simultaneously receive a reference signal and a transmission signal, the transmission signal is obtained after the signal sent by the existing transmitting antenna passes through a plasma sheath, and the electron density of a region between receiving and transmitting is estimated according to the change of information such as signal amplitude, phase and the like extracted from the received transmission signal. According to the invention, radiation sources such as an existing measurement and control communication system on the aircraft are utilized, the electron density of a local point is measured relative to the probe, the average electron density of the area can be estimated, and a local stagnation point caused by mismatching of the probe and the surface material of the aircraft can not be generated; compared with the existing microwave reflection method, the method utilizes the existing radiation source (such as a measurement and control communication system), does not need to increase transmitting equipment or channels, reduces the risk of electromagnetic incompatibility, and saves the installation space in the aircraft; compared with the ground post-inversion method, although the method is used for radio signal estimation, the embodiment of the invention has less signal transmission links, can reduce the influence of space environment and equipment calibration to the maximum extent, and can realize the whole-process online measurement.
Fig. 2 is a schematic flow chart of a passive online electron density identification method according to an embodiment of the invention, as shown in fig. 2, including:
step S1, identifying the receiver to obtain the transmission signal and the reference signal;
step S2, determining signal attenuation information and signal phase difference information according to the transmission signal and the reference signal;
in step S3, the electron density is determined from the signal attenuation information and the signal phase difference information.
On the basis of the foregoing embodiment, the step of determining signal attenuation information and signal phase difference information according to the transmission signal and the reference signal specifically includes:
performing digitization and down-conversion on the reference signal and the transmission signal to zero intermediate frequency to obtain a digitized orthogonal down-conversion signal of the reference signal and a digitized orthogonal down-conversion signal of the transmission signal;
recovering instantaneous amplitude of the reference signal and instantaneous phase information of the reference signal from a digitized quadrature down-conversion signal of the reference signal, and recovering instantaneous amplitude of the transmission signal and instantaneous phase information of the transmission signal from a digitized quadrature down-conversion signal of the transmission signal;
signal attenuation information is determined from the instantaneous amplitude of the reference signal and the instantaneous amplitude of the transmitted signal, and signal phase difference information is determined from the instantaneous phase information of the reference signal and the instantaneous phase information of the transmitted signal.
On the basis of the foregoing embodiment, the step of determining the electron density from the signal attenuation information and the signal phase difference information specifically includes:
determining a first average electron density according to the signal attenuation information, and determining a second average electron density according to the signal phase difference information;
and carrying out weighted average on the first average electron density and the second average electron density to obtain electron density information.
Specifically, the transmitted signal described in the embodiments of the present invention refers to a signal received by the receiving antenna after the reference signal transmitted from the existing transmitter through the transmitting antenna travels a distance in the plasma sheath.
The specific method for determining the signal attenuation information and the signal phase difference information according to the transmission signal and the reference signal in the embodiment of the present invention is consistent with the means in the above embodiments, please refer to the above embodiments, and this embodiment is not described again.
The determining of the electron density through the signal attenuation information and the signal phase difference information specifically includes determining the signal attenuation information and the signal phase difference information according to the signal attenuation information and the signal phase difference information, determining a first average electron density according to the signal attenuation information, determining a second average electron density according to the signal phase difference information, then performing weighted average on the first average electron density and the second average electron density, and presetting that the weights of the first average electron density and the second average electron density are equal to obtain the electron density information.
According to the embodiment of the invention, the receiving antenna and the coupler are arranged, so that the identification receiver can simultaneously receive the reference signal and the transmission signal, the transmission signal is obtained after the signal sent by the existing transmitting antenna passes through the plasma sheath, and the electron density of the region between receiving and transmitting is estimated according to the change of the information such as the signal amplitude, the signal phase and the like extracted from the received transmission signal. According to the invention, radiation sources such as an existing measurement and control communication system on the aircraft are utilized, the electron density of a local point is measured relative to the probe, the average electron density of the area can be estimated, and a local stagnation point caused by mismatching of the probe and the surface material of the aircraft can not be generated; compared with the existing microwave reflection method, the method utilizes the existing radiation source (such as a measurement and control communication system), does not need to increase transmitting equipment or channels, reduces the risk of electromagnetic incompatibility, and saves the installation space in the aircraft; compared with the ground post-inversion method, although the method is used for radio signal estimation, the embodiment of the invention has less signal transmission links, can reduce the influence of space environment and equipment calibration to the maximum extent, and can realize the whole-process online measurement.
Fig. 3 is a schematic structural diagram of an electronic device referred to as an identification receiver according to an embodiment of the present invention, as shown in fig. 3, the electronic device may include: a processor (processor)310, a communication Interface (communication Interface)320, a memory (memory)330 and a communication bus 340, wherein the processor 310, the communication Interface 320 and the memory 330 communicate with each other via the communication bus 340. The processor 310 may call logic instructions in the memory 330 to perform the following method: acquiring a transmission signal and a reference signal; determining signal attenuation information and signal phase difference information according to the transmission signal and the reference signal; the electron density is determined from the signal attenuation information and the signal phase difference information.
In addition, the logic instructions in the memory 330 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
An embodiment of the present invention discloses a computer program product, which includes a computer program stored on a non-transitory computer readable storage medium, the computer program including program instructions, when the program instructions are executed by a computer, the computer can execute the methods provided by the above method embodiments, for example, the method includes: acquiring a transmission signal and a reference signal; determining signal attenuation information and signal phase difference information according to the transmission signal and the reference signal; the electron density is determined from the signal attenuation information and the signal phase difference information.
Embodiments of the present invention provide a non-transitory computer-readable storage medium storing server instructions, where the server instructions cause a computer to execute the method provided in the foregoing embodiments, for example, the method includes: acquiring a transmission signal and a reference signal; determining signal attenuation information and signal phase difference information according to the transmission signal and the reference signal; the electron density is determined from the signal attenuation information and the signal phase difference information.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A passive online electron density identification system, comprising: a receiving antenna, a coupler and an identification receiver;
the receiving antenna and the existing transmitting antenna are arranged on the inner side of the aircraft shell in a staggered mode and used for receiving the transmission signals radiated from the transmitting antenna;
the coupler couples out a reference signal from an existing transmission path and transmits the reference signal to the identification receiver;
the identification receiver is used for receiving a reference signal sent by an existing transmitter through a wired channel and a transmission signal sent by a wireless channel, and calculating electron density information according to the reference signal and the transmission signal.
2. The passive in-line electronic density identification system of claim 1, wherein the identification receiver comprises: the system comprises a radio frequency front-end module, an intermediate frequency processing module and a digital processing module;
the radio frequency front end module is used for filtering, amplifying and frequency-converting a reference signal and a transmission signal to an intermediate frequency, and then outputting the intermediate frequency signal of the reference signal and the intermediate frequency signal of the transmission signal to the intermediate frequency processing module;
the intermediate frequency processing module is used for digitizing, orthogonally downconverting an intermediate frequency signal of the reference signal and an intermediate frequency signal of the transmission signal to a baseband and outputting the baseband to the digital processing module;
the digital processing module is used for recovering the instantaneous amplitude of the reference signal and the instantaneous phase information of the reference signal from the digitized orthogonal down-conversion signal of the reference signal, and recovering the instantaneous amplitude of the transmission signal and the instantaneous phase information of the transmission signal from the digitized orthogonal down-conversion signal of the transmission signal; the electron density information is calculated based on the instantaneous amplitude of the reference signal, the instantaneous phase information of the reference signal, the instantaneous amplitude of the transmission signal, and the instantaneous phase information of the transmission signal.
3. The passive online electronic density recognition system of claim 2, wherein the digital processing module is specifically configured to:
determining signal attenuation information from the instantaneous amplitude of the reference signal and the instantaneous amplitude of the transmitted signal;
determining signal phase difference information from the instantaneous phase information of the reference signal and the instantaneous phase information of the transmission signal;
determining a first average electron density according to the signal attenuation information, and determining a second average electron density according to the signal phase difference information;
and carrying out weighted average on the first average electron density and the second average electron density to obtain electron density information.
4. An electron density recognition method based on the passive online electron density recognition system of any one of claims 1-3, comprising:
acquiring a transmission signal sent by a transmitting antenna and a reference signal sent by an identification receiver;
determining signal attenuation information and signal phase difference information according to the transmission signal and the reference signal;
the electron density is determined from the signal attenuation information and the signal phase difference information.
5. The electron density identification method according to claim 4, wherein the step of determining the signal attenuation information and the signal phase difference information according to the transmission signal and the reference signal specifically comprises:
performing digitization and down-conversion on the reference signal and the transmission signal to zero intermediate frequency to obtain a digitized orthogonal down-conversion signal of the reference signal and a digitized orthogonal down-conversion signal of the transmission signal;
recovering instantaneous amplitude of the reference signal and instantaneous phase information of the reference signal from a digitized quadrature down-conversion signal of the reference signal, and recovering instantaneous amplitude of the transmission signal and instantaneous phase information of the transmission signal from a digitized quadrature down-conversion signal of the transmission signal;
signal attenuation information is determined from the instantaneous amplitude of the reference signal and the instantaneous amplitude of the transmitted signal, and signal phase difference information is determined from the instantaneous phase information of the reference signal and the instantaneous phase information of the transmitted signal.
6. The electron density identification method according to claim 4, wherein the step of determining the electron density by the signal attenuation information and the signal phase difference information specifically comprises:
determining a first average electron density according to the signal attenuation information, and determining a second average electron density according to the signal phase difference information;
and carrying out weighted average on the first average electron density and the second average electron density to obtain electron density information.
7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the electron density recognition method according to any one of claims 5 to 6 are implemented when the processor executes the program.
8. A non-transitory computer readable storage medium, on which a computer program is stored, wherein the computer program, when being executed by a processor, implements the steps of the electron density recognition method according to any one of claims 5 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110027687.8A CN112865888B (en) | 2021-01-11 | 2021-01-11 | Passive online electronic density identification system and method and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110027687.8A CN112865888B (en) | 2021-01-11 | 2021-01-11 | Passive online electronic density identification system and method and electronic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112865888A true CN112865888A (en) | 2021-05-28 |
| CN112865888B CN112865888B (en) | 2022-12-20 |
Family
ID=76002044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110027687.8A Active CN112865888B (en) | 2021-01-11 | 2021-01-11 | Passive online electronic density identification system and method and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112865888B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6573731B1 (en) * | 1999-07-20 | 2003-06-03 | Tokyo Electron Limited | Electron density measurement and control system using plasma-induced changes in the frequency of a microwave oscillator |
| CN105549031A (en) * | 2015-12-31 | 2016-05-04 | 武汉大学 | Ionosphere propagation time delay time domain value calculating method of satellite signals |
| CN106461710A (en) * | 2015-06-11 | 2017-02-22 | 核工业西南物理研究院 | Method and system for real-time calculating phase shift signal, plasma diagnostic method and system |
| US20180122128A1 (en) * | 2015-02-25 | 2018-05-03 | Atmospheric and Space Technology Research Associates, LLC | Iterative ray-tracing for autoscaling of oblique ionograms |
| CN108037173A (en) * | 2017-12-06 | 2018-05-15 | 上海无线电设备研究所 | A kind of test system and method for hypersonic two dimension plasma sheath |
| CN111200896A (en) * | 2020-01-14 | 2020-05-26 | 西安电子科技大学 | Plasma parameter diagnosis method based on broadband reflection coefficient curve curvature analysis |
-
2021
- 2021-01-11 CN CN202110027687.8A patent/CN112865888B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6573731B1 (en) * | 1999-07-20 | 2003-06-03 | Tokyo Electron Limited | Electron density measurement and control system using plasma-induced changes in the frequency of a microwave oscillator |
| US20180122128A1 (en) * | 2015-02-25 | 2018-05-03 | Atmospheric and Space Technology Research Associates, LLC | Iterative ray-tracing for autoscaling of oblique ionograms |
| CN106461710A (en) * | 2015-06-11 | 2017-02-22 | 核工业西南物理研究院 | Method and system for real-time calculating phase shift signal, plasma diagnostic method and system |
| CN105549031A (en) * | 2015-12-31 | 2016-05-04 | 武汉大学 | Ionosphere propagation time delay time domain value calculating method of satellite signals |
| CN108037173A (en) * | 2017-12-06 | 2018-05-15 | 上海无线电设备研究所 | A kind of test system and method for hypersonic two dimension plasma sheath |
| CN111200896A (en) * | 2020-01-14 | 2020-05-26 | 西安电子科技大学 | Plasma parameter diagnosis method based on broadband reflection coefficient curve curvature analysis |
Non-Patent Citations (2)
| Title |
|---|
| HENG WANG等: "Research on Low Pressure Electronic Density Diagnostic Method of Single Paperback Probe Based on Langmuir Probe Theory", 《2020 13TH INTERNATIONAL CONGRESS ON IMAGE AND SIGNAL PROCESSING, BIOMEDICAL ENGINEERING AND INFORMATICS (CISP-BMEI)》 * |
| 张丽华等: ""再入"飞行器等离子体鞘套的电磁传播特性仿真", 《电子科技》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112865888B (en) | 2022-12-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3544323B1 (en) | Method for determining channel delay, positioning method, and related device | |
| EP3170014B1 (en) | Rfid tag tracking using phase likelihood | |
| EP3767845A1 (en) | Test method, transmitting apparatus, test apparatus and test system | |
| US20080307025A1 (en) | Location determination in sensor networks using time-window algorithm | |
| CN111521882B (en) | On-orbit calibration method and device for beam pointing error of deep space probe antenna | |
| US20220075021A1 (en) | Coordination of wireless communication unit and radar unit in a wireless communication network | |
| US20150288462A1 (en) | Method for Channel Calibration | |
| CN103630878A (en) | Frequency band fusion method and device based on adaptive iteration scheme | |
| CN107944312A (en) | A kind of RFID reader receiving sensitivity detection method and device | |
| US11428772B2 (en) | Compensating for crosstalk in determination of an angle of arrival of an electromagnetic wave at a receive antenna | |
| WO2016152030A1 (en) | Positioning method, positioning system, correction information generation method, correction information generation device, and positioning system relay station and terminal | |
| CN112865888B (en) | Passive online electronic density identification system and method and electronic equipment | |
| CN105072063A (en) | Method and device for suppressing interference signal | |
| Qi et al. | DVB-T2 MISO field measurements and a calibrated coverage gain predictor | |
| Wielandner et al. | Multipath-based SLAM with multiple-measurement data association | |
| US11962363B2 (en) | Load condition detection | |
| CN111602066B (en) | Method, system and device | |
| US11467243B2 (en) | Radio wave arrival direction estimation apparatus | |
| US10819453B2 (en) | Method for determining geometric information of devices in millimeter-wave networks | |
| Naganawa et al. | Aircraft–Receiver Distance Estimation Using ADS-B Signal Strength for Position Verification Application | |
| CN113126097A (en) | Meteorological detection method and digital phased array weather radar | |
| KR20130066873A (en) | Positioning system and method based on wireless communication apparatus comprising multiple antenna | |
| KR101905434B1 (en) | Apparatus for measuring passive intermodulation distortion signal and method for using the same | |
| CN113126036B (en) | Fast scanning microwave detector and detection method | |
| WO2023032901A1 (en) | Positioning system and positioning method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |