CN114124290B - Method and system for correcting radio signal - Google Patents
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- H—ELECTRICITY
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- 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
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Abstract
The invention discloses a method and a system for correcting radio signals, which relate to the technical field of radio signal monitoring.
Description
Technical Field
The invention relates to the technical field of radio signal monitoring, in particular to a method and a system for correcting a radio signal.
Background
The existing navigation equipment is usually configured with a radio technology detection device, a radar detection device, etc., and the main task is to detect unknown radar signals, radio communication signals, etc., and obtain technical parameters, communication contents, location and other information thereof. The electronic interference means that the electromagnetic spectrum struggle between electronic equipment and equipment is utilized to achieve the effect of electric wave disturbance.
At present, electronic detecting equipment on the market can only analyze the radio magnetic wave signal transmitted by the opposite side to obtain information, and cannot generate an interference signal corresponding to a channel and a sequence according to the information of the opposite side to perform emission source electronic interference, while electronic interference equipment can only intercept the information of the opposite side to generate an interference signal to perform electronic interference, and cannot analyze the radio magnetic wave signal transmitted by the opposite side to obtain the information.
In the flight process of the navigation equipment, a radar positioning signal and a radio signal sent by a transmitting source in a receiving range are received, if only one transmitting source exists in the airspace, the received radio signal is an original signal, the geographical coordinates of the unique and accurate transmitting source can be locked through the radar positioning signal and the radio signal, the interference signal generated by the navigation equipment according to the radio signal is high in accuracy and strong in interference, but in the actual flight process of the navigation equipment, a plurality of transmitting sources exist in the receiving range, wherein the radio signals between the transmitting sources are mutually interfered and the original signal is changed, so that the radio signal received by the navigation equipment after mutual interference is caused, the coordinates of the transmitting source solved at the moment can be intuitively found to be inconsistent with the coordinates of the transmitting source positioned by the radar, the interference signal generated by directly processing the mutually interfered radio signals also has low accuracy, And the interference is weak.
Disclosure of Invention
The present invention aims to overcome the disadvantages of the prior art and provides a method and a system for correcting a radio signal, comprising the following steps:
step 1: acquiring each group of communication signals by the navigation equipment within the capturing time, wherein each group of communication signals comprises radar signals and radio signals, the radar signals are directly received by the navigation equipment, the radio signals are transmitted to the navigation equipment by a base station for receiving, the radar signals are continuous pulse sequences, and the radio signals are electromagnetic waves after mutual interference among a plurality of emission sources;
step 2: taking the takeoff coordinate of the navigation equipment as a receiving source coordinate system, taking the flight path direction as the positive direction of the y axis of the coordinate system, taking a radar signal into a radar positioning module to generate radar positioning coordinates, applying a confidence correction algorithm to a radio signal to obtain radio positioning coordinates, and mapping each coordinate in the receiving source coordinate system;
and step 3: judging whether the radar positioning coordinates and the radio positioning coordinates in each group of communication signals deviate or not, if so, entering a step 4, and if not, entering a step 5;
and 4, step 4: performing confidence correction algorithm on the radio signal based on the offset to obtain a corrected radio signal, and entering the step 5;
and 5: and taking a radio signal as an input to bring the radio signal into the interference module, and sending an interference signal by the navigation equipment through the interference module.
The acquisition time here can take a smaller value, in the acquisition time of short, can enough satisfy radio signal's comprehensive collection, and the flying distance of navigation equipment can be ignored simultaneously, is difficult for causing the influence to the establishment of coordinate system.
Preferably, the navigation device further acquires base station communication data within the capturing time, the base station communication data includes time of each group of communication signals reaching the base station and satellite positioning data of the base station, and the base station positioning module generates a base station positioning coordinate and maps the base station positioning coordinate in the receiving source coordinate system.
Preferably, the step 2 further comprises the following steps:
step 21: according to the base station positioning coordinates, carrying out impurity removal and sinc filtering processing on the radio signals in each group of communication signals, and then sampling, quantizing and encoding the radio signals into digital signals;
step 22: and listing a covariance matrix of the emission source based on a confidence correction algorithm according to the time difference generated when each group of communication signals reaches a plurality of base stations, and solving the covariance matrix by adopting a least square algorithm to obtain the radio positioning coordinates of the emission source.
By adopting the sinc filtering processing, the damage of the radio signal caused by signal aliasing in the subsequent sampling, quantization and coding processes can be effectively avoided.
Preferably, in the step 22, a covariance matrix of the emission source is listed based on a confidence correction algorithm, and the covariance matrix is solved by using a least square algorithm, so as to obtain a radio positioning coordinate of the emission source, the method further includes the following steps:
is provided with
To be the coordinates of the base station,
is as follows
The horizontal coordinate value of each base station on the receiving source coordinate system;
is as follows
The longitudinal coordinate value of each base station on the receiving source coordinate system; is provided with
Is a radiation source
The radio location coordinates of (a) are,
is a radiation source
The abscissa of the (c) axis of the (c),
is a radiation source
The ordinate of (a) is,
is composed of
The degree of confidence of (a) is,
is composed of
The degree of confidence of (a) is,
is composed of
The amount of the fitting of (a) is,
is composed of
The amount of the fitting of (a) is,
the formula for obtaining the covariance matrix of the emission source based on the confidence correction algorithm is as follows:
wherein:
let the time difference of arrival of each group of communication signals at the base station be
The formula for solving the covariance matrix by adopting the least square algorithm is as follows:
wherein:
wherein the content of the first and second substances,
for each group of communication signals arrive
Time of arrival at base station and time of arrival at
Time difference between base stations;
is the resonance frequency emitted by the base station;
for navigation equipment and
the distance between base stations;
is as follows
Radio signal frequencies received by the individual base stations;
a frequency of a radio signal transmitted from a base station;
is the correlation coefficient.
Preferably, in the step 5, the processing procedure of the interference module further includes the following steps:
step 51: removing impurities from the corrected radio signal, and then carrying out sinc filtering processing to obtain an effective signal section;
step 52: judging whether the effective signal segment is encrypted, if yes, entering a step 53, and if not, entering a step 54;
step 53: decrypting the effective signal segment through the decryption module to obtain a key of the effective signal segment, acquiring the decoded effective signal segment based on the key, and entering step 54;
step 54: and the interference signal compiling module is used for obtaining a corresponding interference signal according to the effective signal segment output.
The effective signal section after the sinc filtering processing comprises a control signal and a satellite positioning signal, most of equipment adopts a GPS (global positioning system) or a spread spectrum communication technology, most of the control signal is in conventional civil frequency bands such as 2.4 GHz and 5.8 GHz, and when an interference signal is generated, satellite positioning interference is generally adopted, so that the course of radio emission source equipment is lost and out of control occurs; the control signal interference mode is divided into remote control signal frequency band blocking interference and tracking interference, and the tracking interference can interfere a specific frequency band according to the jump of the control signal, so that the interference range is reduced, the interference power is saved, and the influence on the electromagnetic environment is small; the control interference signal frequency modulation range is wide, interference equipment with large real-time bandwidth needs to be used, and the requirements on the processing capacity and the response speed of the interference equipment are high.
A system for modifying a radio signal, comprising:
receiving a database: the communication signal acquisition device is used for storing the communication signal acquired by the navigation equipment;
an interference module: the wireless point signal generating device is used for generating an interference signal according to the wireless point signal;
a radar positioning module: the device is used for radar positioning of other devices in the air area except navigation devices;
a coordinate generation module: the system is used for establishing a transmitting source coordinate system;
the navigation equipment control center: instructions for implementing control and data transfer between the modules;
the receiving database, the interference module, the radar positioning module and the coordinate generating module are all connected with the navigation equipment control center.
In the process of connecting with the base station, considering that other navigation equipment possibly exists in the area where the base station is located, the navigation equipment can share interference signals through the base station, and the stored data of the receiving database is enriched.
Preferably, the interference module further includes a decryption module and an interference signal compiling module, the decryption module is configured to decode the radio signal and obtain the control information and the key of the effective signal segment, the interference signal compiling module is configured to output a corresponding interference signal according to the input radio signal, and the decryption module and the interference signal compiling module are both connected to the navigation equipment control center.
Preferably, the system also comprises a filtering processing module and a data conversion module, wherein the filtering processing module is used for sequentially carrying out impurity removal and sinc filtering processing on the radio signals; the data conversion module is used for sampling, quantizing and coding the radio signals to generate digital signals, and the filtering processing module and the data conversion module are both connected with the navigation equipment control center.
The invention has the beneficial effects that:
the method comprises the steps of simultaneously collecting each group of communication signals generated by an emission source, establishing an emission source coordinate system, generating corresponding radio positioning coordinates and radar positioning coordinates according to radio signals and radar signals in each group of communication signals, correcting the radio signals in the group of communication signals when the radio positioning coordinates and the radar positioning coordinates of a certain group of communication signals deviate, so as to obtain the radio signals which are emitted by the emission source and are not interfered with each other, generating interference signals according to the corrected radio signals, greatly enhancing the interference effect of the generated interference signals on the emission source, and improving the success rate of interference on the emission source.
Drawings
Fig. 1 shows a signal flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to fig. 1 of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other implementations made by those of ordinary skill in the art based on the embodiments of the present invention are obtained without inventive efforts.
In the description of the present invention, it is to be understood that the terms "counterclockwise", "clockwise", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used for convenience of description only, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting.
A method and system for modifying a radio signal comprising the steps of:
step 1: acquiring each group of communication signals by the navigation equipment within the capturing time, wherein each group of communication signals comprises radar signals and radio signals, the radar signals are directly received by the navigation equipment, the radio signals are transmitted to the navigation equipment by a base station for receiving, the radar signals are continuous pulse sequences, and the radio signals are electromagnetic waves after mutual interference among a plurality of emission sources;
step 2: taking the takeoff coordinate of the navigation equipment as a receiving source coordinate system, taking the flight path direction as the positive direction of the y axis of the coordinate system, taking a radar signal into a radar positioning module to generate radar positioning coordinates, applying a confidence correction algorithm to a radio signal to obtain radio positioning coordinates, and mapping each coordinate in the receiving source coordinate system;
and step 3: judging whether the radar positioning coordinates and the radio positioning coordinates in each group of communication signals deviate or not, if so, entering a step 4, and if not, entering a step 5;
and 4, step 4: performing confidence correction algorithm on the radio signal based on the offset to obtain a corrected radio signal, and entering the step 5;
and 5: and taking a radio signal as an input to bring the radio signal into the interference module, and sending an interference signal by the navigation equipment through the interference module.
The acquisition time here can take a smaller value, in the acquisition time of short, can enough satisfy radio signal's comprehensive collection, and the flying distance of navigation equipment can be ignored simultaneously, is difficult for causing the influence to the establishment of coordinate system.
Further, the navigation equipment also acquires base station communication data within the capturing time, the base station communication data comprises the time of each group of communication signals reaching the base station and satellite positioning data of the base station, and the base station positioning module generates a base station positioning coordinate and maps the base station positioning coordinate in a receiving source coordinate system.
Further, the step 2 further includes the following steps:
step 21: according to the base station positioning coordinates, carrying out impurity removal and sinc filtering processing on the radio signals in each group of communication signals, and then sampling, quantizing and encoding the radio signals into digital signals;
step 22: and listing a covariance matrix of the emission source based on a confidence correction algorithm according to the time difference generated when each group of communication signals reaches a plurality of base stations, and solving the covariance matrix by adopting a least square algorithm to obtain the radio positioning coordinates of the emission source.
By adopting the sinc filtering processing, the damage of the radio signal caused by signal aliasing in the subsequent sampling, quantization and coding processes can be effectively avoided.
Further, in step 22, a covariance matrix of the emission source is listed based on the confidence correction algorithm, and the covariance matrix is solved by using the least square algorithm, so as to obtain a radio positioning coordinate of the emission source, further including the following steps:
is provided with
To be the coordinates of the base station,
is as follows
The horizontal coordinate value of each base station on the receiving source coordinate system;
is as follows
The longitudinal coordinate value of each base station on the receiving source coordinate system; is provided with
Is a radiation source
The radio location coordinates of (a) are,
is a radiation source
The abscissa of the (c) axis of the (c),
is a radiation source
The ordinate of (a) is,
is composed of
The degree of confidence of (a) is,
is composed of
The degree of confidence of (a) is,
is composed of
The amount of the fitting of (a) is,
is composed of
The amount of the fitting of (a) is,
the formula for obtaining the covariance matrix of the emission source based on the confidence correction algorithm is as follows:
wherein:
let the time difference of arrival of each group of communication signals at the base station be
The formula for solving the covariance matrix by adopting the least square algorithm is as follows:
wherein:
wherein the content of the first and second substances,
for each group of communication signals arrive
Time of arrival at base station and time of arrival at
Time difference between base stations;
is the resonance frequency emitted by the base station;
for navigation equipment and
the distance between base stations;
is as follows
Radio signal frequencies received by the individual base stations;
a frequency of a radio signal transmitted from a base station;
is the correlation coefficient.
Further, in step 5, the processing procedure of the interference module further includes the following steps:
step 51: removing impurities from the corrected radio signal, and then carrying out sinc filtering processing to obtain an effective signal section;
step 52: judging whether the effective signal segment is encrypted, if yes, entering a step 53, and if not, entering a step 54;
step 53: decrypting the effective signal segment through the decryption module to obtain a key of the effective signal segment, acquiring the decoded effective signal segment based on the key, and entering step 54;
step 54: and the interference signal compiling module is used for obtaining a corresponding interference signal according to the effective signal segment output.
The effective signal section after the sinc filtering processing comprises a control signal and a satellite positioning signal, most of equipment adopts a GPS (global positioning system) or a spread spectrum communication technology, most of the control signal is in conventional civil frequency bands such as 2.4 GHz and 5.8 GHz, and when an interference signal is generated, satellite positioning interference is generally adopted, so that the course of radio emission source equipment is lost and out of control occurs; the control signal interference mode is divided into remote control signal frequency band blocking interference and tracking interference, and the tracking interference can interfere a specific frequency band according to the jump of the control signal, so that the interference range is reduced, the interference power is saved, and the influence on the electromagnetic environment is small; the control interference signal frequency modulation range is wide, interference equipment with large real-time bandwidth needs to be used, and the requirements on the processing capacity and the response speed of the interference equipment are high.
A system for modifying a radio signal, comprising:
receiving a database: the communication signal acquisition device is used for storing the communication signal acquired by the navigation equipment;
an interference module: the wireless point signal generating device is used for generating an interference signal according to the wireless point signal;
a radar positioning module: the device is used for radar positioning of other devices in the air area except navigation devices;
a coordinate generation module: the system is used for establishing a transmitting source coordinate system;
the navigation equipment control center: instructions for implementing control and data transfer between the modules;
the receiving database, the interference module, the radar positioning module and the coordinate generating module are all connected with the navigation equipment control center.
In the process of connecting with the base station, considering that other navigation equipment possibly exists in the area where the base station is located, the navigation equipment can share interference signals through the base station, and the stored data of the receiving database is enriched.
Furthermore, the interference module further comprises a decryption module and an interference signal compiling module, the decryption module is used for decoding the radio signals and obtaining the control information and the secret key of the effective signal section, the interference signal compiling module is used for outputting the corresponding interference signals according to the input radio signals, and the decryption module and the interference signal compiling module are both connected with the navigation equipment control center.
The system further comprises a filtering processing module and a data conversion module, wherein the filtering processing module is used for sequentially carrying out impurity removal and sinc filtering processing on the radio signals; the data conversion module is used for sampling, quantizing and coding the radio signals to generate digital signals, and the filtering processing module and the data conversion module are both connected with the navigation equipment control center.
Under the condition of single radar detection, if the small-sized flying device is hovering or flying at an ultra-low altitude, due to a low doppler effect, the detected signal at the target point may be weak, and the single radar detection may not meet the interference requirement, meanwhile, under the condition of single radio detection, although the radio detection has the advantages of no influence of size, material and buildings and no generation of electromagnetic pollution, when detecting a plurality of emission sources, as shown in fig. 1, due to the possible mutual interference among the plurality of emission sources, the received radio signal subjected to the mutual interference may have a great influence on the subsequently generated interference signal, where the radar signal is combined with the radio signal, the plurality of radio signals and the radar signal are collected within the collection time, and for the plurality of received signals, grouping in a receiving sequence, ensuring that radio signals and radar signals in the same group are transmitted by the same equipment, establishing a transmitting source coordinate system, converting the radar signals into radar positioning coordinates, mapping the radar positioning coordinates into the receiving source coordinate system, analyzing and processing the radio signals to obtain radio positioning coordinates, and mapping the radio positioning coordinates into the receiving source coordinate system; the corrected radio signal is obtained by performing confidence correction algorithm on the radio signal based on the offset, mutual interference of other transmitting sources to the radio signal of the current transmitting source can be eliminated, the radio signal only containing original data is obtained, an interference signal is generated according to the corrected radio signal, the interference signal at the moment is formed according to the radio signal of the current transmitting source, mutual interference influence is avoided, the interference effect on the transmitting source is strong, and the interference success rate is high.
Claims (4)
1. A method of modifying a radio signal comprising navigational equipment, the navigational equipment acquiring within a reception range each set of communication signals generated by a transmission source, comprising the steps of:
step 1: acquiring each group of communication signals by the navigation equipment within the capturing time, wherein each group of communication signals comprises radar signals and radio signals, the radar signals are directly received by the navigation equipment, the radio signals are transmitted to the navigation equipment by a base station for receiving, the radar signals are continuous pulse sequences, and the radio signals are electromagnetic waves after mutual interference among a plurality of emission sources;
step 2: taking the takeoff coordinate of the navigation equipment as a receiving source coordinate system, taking the flight path direction as the positive direction of the y axis of the coordinate system, taking a radar signal into a radar positioning module to generate radar positioning coordinates, applying a confidence correction algorithm to a radio signal to obtain radio positioning coordinates, and mapping each coordinate in the receiving source coordinate system;
and step 3: judging whether the radar positioning coordinates and the radio positioning coordinates in each group of communication signals deviate or not, if so, entering a step 4, and if not, entering a step 5;
and 4, step 4: performing confidence correction algorithm on the radio signal based on the offset to obtain a corrected radio signal, and entering the step 5;
and 5: taking a radio signal as an input to bring the radio signal into an interference module, and sending an interference signal by navigation equipment through the interference module;
the navigation equipment also acquires base station communication data in the capturing time, the base station communication data comprises the time of each group of communication signals reaching the base station and the satellite positioning data of the base station, and the base station positioning module generates a base station positioning coordinate and maps the base station positioning coordinate in a receiving source coordinate system;
in the step 2, the method further comprises the following steps:
step 21: according to the base station positioning coordinates, carrying out impurity removal and sinc filtering processing on the radio signals in each group of communication signals, and then sampling, quantizing and encoding the radio signals into digital signals;
step 22: according to the time difference generated when each group of communication signals reaches a plurality of base stations, an emission source covariance matrix is listed based on a confidence correction algorithm, and the covariance matrix is solved by adopting a least square algorithm to obtain emission source radio positioning coordinates;
in step 22, a covariance matrix of the emission source is listed based on the confidence correction algorithm, and the covariance matrix is solved by using the least square algorithm, so that the method further includes the following steps:
is provided with
To be the coordinates of the base station,
is as follows
The horizontal coordinate value of each base station on the receiving source coordinate system;
is as follows
The longitudinal coordinate value of each base station on the receiving source coordinate system; is provided with
Is a radiation source
The radio location coordinates of (a) are,
is a radiation source
The abscissa of the (c) axis of the (c),
is a radiation source
The ordinate of (a) is,
is composed of
The degree of confidence of (a) is,
is composed of
The degree of confidence of (a) is,
is composed of
The amount of the fitting of (a) is,
is composed of
The amount of the fitting of (a) is,
the formula for obtaining the covariance matrix of the emission source based on the confidence correction algorithm is as follows:
wherein:
let the time difference of arrival of each group of communication signals at the base station be
The formula for solving the covariance matrix by adopting the least square algorithm is as follows:
wherein:
wherein the content of the first and second substances,
for each group of communication signals arrive
Time of arrival at base station and time of arrival at
Time difference between base stations;
is the resonance frequency emitted by the base station;
for navigation equipment and
the distance between base stations;
is as follows
Radio signal frequencies received by the individual base stations;
a frequency of a radio signal transmitted from a base station;
is a correlation coefficient;
in step 5, the processing procedure of the interference module further includes the following steps:
step 51: removing impurities from the corrected radio signal, and then carrying out sinc filtering processing to obtain an effective signal section;
step 52: judging whether the effective signal segment is encrypted, if yes, entering a step 53, and if not, entering a step 54;
step 53: decrypting the effective signal segment through the decryption module to obtain a key of the effective signal segment, acquiring the decoded effective signal segment based on the key, and entering step 54;
step 54: and the interference signal compiling module is used for obtaining a corresponding interference signal according to the effective signal segment output.
2. A system for modifying a radio signal, comprising a method for modifying a radio signal according to claim 1, comprising:
receiving a database: the communication signal acquisition device is used for storing the communication signal acquired by the navigation equipment;
an interference module: the wireless point signal generating device is used for generating an interference signal according to the wireless point signal;
a radar positioning module: the device is used for radar positioning of other devices in the air area except navigation devices;
a coordinate generation module: the system is used for establishing a transmitting source coordinate system;
the navigation equipment control center: instructions for implementing control and data transfer between the modules;
the receiving database, the interference module, the radar positioning module and the coordinate generating module are all connected with the navigation equipment control center.
3. The system according to claim 2, wherein the interference module further comprises a decryption module and an interference signal generation module, the decryption module is configured to decode the radio signal to obtain the control information and the secret key of the valid signal segment, the interference signal generation module is configured to obtain the corresponding interference signal according to the input radio signal output, and the decryption module and the interference signal generation module are both connected to the navigation equipment control center.
4. The system according to claim 2, further comprising a filtering processing module and a data converting module, wherein the filtering processing module is configured to perform trash removal and sinc filtering processing on the radio signal in sequence; the data conversion module is used for sampling, quantizing and coding the radio signals to generate digital signals, and the filtering processing module and the data conversion module are both connected with the navigation equipment control center.
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