CN117724056B - Method and system for removing interference of space target detected by incoherent scattering radar - Google Patents
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Abstract
The invention belongs to the field of ionosphere detection, in particular relates to a method and a system for removing space target interference in incoherent scattering radar detection, and aims to solve the problem of ionosphere detection data pollution caused by space target interference. The invention comprises the following steps: calculating a power profile according to the ionosphere detection signals, and accumulating the power profile; setting an initial background sample, and calculating the relative variation of the current accumulated power profile and the background sample, wherein the relative variation is used as an object to be detected; designing a constant false alarm detector; carrying out space target interference identification through a constant false alarm detector, recording an interference position if interference exists, and updating a background sample into a current accumulated power profile if interference does not exist; and removing the distance unit identified as interference from the original detection signal, and circularly completing the interference removal of all signals. The invention reduces the interference and omission of space targets caused by the fluctuation of the ionosphere background, has high accuracy and ensures the quality of ionosphere detection data.
Description
Technical Field
The invention belongs to the field of ionosphere detection, and particularly relates to a method and a system for removing space target interference in incoherent scattering radar detection.
Background
The space objects around the earth include satellites, rocket bodies, space debris, and natural satellites, wherein satellites and the resulting space debris are the primary sources. With the proposal and implementation of a series of large constellation plans (such as "StarLink", "Kupper", "StarNet", etc.), the number of spatial targets on the near-earth orbit is growing in bursts. Dense spatial targets around the earth are a potential threat to both ground-based optical and wireless observations. In ground-based radio observation, a spatial target within the range of a radar beam receives and scatters a radio signal, and if the intensity is large enough, the spatial target can appear in an original signal, so that radar echo is abnormal, interference is caused on a detection signal, and frequent interference can cause normal observation failure.
Incoherent scattering radar has high transmit power and antenna gain and plays an important role in ground-based radio observation in ionosphere studies. At the same time, high performance incoherent scattering radars also generally have excellent spatial target detection capabilities, allowing spatial targets of centimeter-scale size to be detected at kilometers. The powerful detection performance of incoherent scattering radar helps to improve its performance in ionosphere observation, but also results in interference of spatial targets that cannot be ignored in its ionosphere detection.
Disclosure of Invention
In order to solve the above problems in the prior art, namely, the problem that the ionosphere detection data is polluted due to the space target interference, the invention provides a space target interference removing method and a system for incoherent scattering radar detection, wherein the method comprises the following steps:
step S1, calculating a power profile according to ionosphere detection signals, and accumulating the power profile to obtain an accumulated power profile;
step S2, if no background sample exists, setting an initial background sample value to be zero, otherwise, calculating the relative variation of the current accumulated power profile and the background sample, and taking the relative variation as an object to be detected;
step S3, designing a constant false alarm detector;
s4, carrying out space target interference identification on the object to be detected through the constant false alarm detector; if the interference exists, recording the position of the space target interference, and entering step S5; if no interference exists, updating the background sample into a current accumulated power profile, and returning to the step S1; the method comprises the steps of carrying out a first treatment on the surface of the
Step S5, removing the space target interference according to the position of the space target interference obtained by recognition, returning to step S1 until all ionosphere detection signals are processed
Further, the step S3 specifically includes:
calculating the number of signal sampling points in a pulse width according to the pulse width and sampling time interval of the detection signal;
setting the number of the front edges of the protection units, the number of the rear edges of the protection units, the number of the front edges of the reference units and the number of the rear edges of the reference units of the constant false alarm detector as signal sampling points;
taking the mean value of the reference unit as a noise reference value;
setting false alarm probability, calculating threshold factor and finishing the design of the constant false alarm detector.
Further, the noise reference value is calculated by the following steps:
；
wherein,is the sum of the power of the upper edge reference unit, +.>Is the sum of the lower edge reference powers +.>Represents the number of signal samples within a pulse width, < >>Indicate->The first part of the object to be detected>Noise reference value of each distance cell, +.>Representing the relative change of the accumulated power profile from the background sample, +.>Represents the number of serial numbers of the object to be detected,the number of sequence numbers representing the distance units.
Further, the method in step S4 is as follows:
the method for identifying the space target interference of the object to be detected by the constant false alarm detector comprises the following steps:
setting the initial background sample value to be zero, and calculating the relative variation of the current accumulated power profile and the background sampleAs an object to be detected of spatial target interference:
；
；
wherein,represents the->Accumulated power value of individual distance units +.>Representing the total number of ionosphere probe signal profiles detected, for example>Indicate->Work after accumulationFirst part of the rate profile>Values of the individual distance cells; according to the noise reference value->And carrying out space target interference identification through the constant false alarm detector:
the construction criteria are as follows:
wherein,is a threshold factor->，/>For false alarm probability, when the criterion is satisfied, determine +.>The distance units are space target interference, and the positions of the space target interference are recorded; if the criterion is not satisfied in all distance units, updating the background sample to the current accumulated power profile +.>。
Further, the removing of the spatial target interference is specifically to remove the distance unit determined as the spatial target interference from the original detection signal.
In another aspect of the present invention, a spatial target interference removal system for incoherent scattering radar detection is provided, the system comprising: the power profile accumulating module is used for calculating a power profile according to the ionosphere detection signals and accumulating the power profile to obtain an accumulated power profile;
the object to be detected acquisition module is configured to set an initial background sample value to zero if no background sample exists, otherwise, calculate the relative variation of the current accumulated power profile and the background sample, and take the relative variation as the object to be detected;
the constant false alarm detector setting module is used for designing a constant false alarm detector;
the interference recognition module is configured to recognize space target interference on the object to be detected through the constant false alarm detector; if the space target interference exists, recording the position of the space target interference, and entering an interference removal module; if the space target interference does not exist, updating the background sample into the current accumulated power profile, and returning to the power profile accumulating module;
and the interference removing module is configured to remove the space target interference from the detection signals according to the identified space target interference position, and return to the power profile accumulating module until all ionosphere detection signals are processed.
Further, the constant false alarm detector setting module specifically comprises:
calculating the number of signal sampling points in a pulse width according to the pulse width and sampling time interval of the detection signal;
setting the number of the front edges of the protection units, the number of the rear edges of the protection units, the number of the front edges of the reference units and the number of the rear edges of the reference units of the constant false alarm detector as signal sampling points;
taking the mean value of the reference unit as a noise reference value;
setting false alarm probability, calculating threshold factor and finishing the design of the constant false alarm detector.
Further, the noise reference value is calculated by the following steps:
；
wherein,is the sum of the power of the upper edge reference unit, +.>Is the sum of the lower edge reference powers +.>Represents the number of signal samples within a pulse width, < >>Indicate->The first part of the object to be detected>Noise reference value of each distance cell, +.>Representing the relative change of the accumulated power profile from the background sample, +.>Represents the number of serial numbers of the object to be detected,the number of sequence numbers representing the distance units.
Further, the identifying of the spatial target interference to the object to be detected by the constant false alarm detector specifically includes:
setting the initial background sample value to be zero, and calculating the relative variation of the accumulated power profile and the background sampleAs an object to be detected of spatial target interference:
；
；
wherein,represents the->Accumulated power value of individual distance units +.>Representing the total number of ionosphere probe signal profiles detected, for example>Indicate->The +.f. of the accumulated power profile>Values of the individual distance cells; according to the noise reference value->And carrying out space target interference identification through the constant false alarm detector:
the construction criteria are as follows:
；
wherein,is a threshold factor->，/>For false alarm probability, when the criterion is satisfied, determine +.>The distance units are space target interference, and the positions of the space target interference are recorded; if the criterion is not satisfied in all distance units, the background sample is takenUpdated to the current accumulated power profile +.>. Further, the removing of the spatial target interference is specifically to remove the distance unit determined as the spatial target interference from the original detection signal.
The invention has the beneficial effects that:
(1) The invention provides a space target interference removing method aiming at space target interference frequently occurring in incoherent scattering radar ionosphere detection signals, so that space target interference omission caused by ionosphere background fluctuation is reduced, the accuracy of interference detection is improved, and high-quality ionosphere detection data is ensured;
(2) Compared with the method for identifying the space target interference under the ionosphere background, the method has the advantages that the relative change of the background is used as the interference detection object, so that the influence of space-time fluctuation of the ionosphere on the interference identification is effectively reduced, and the detection rate is remarkably improved;
(3) The detection threshold is adaptively adjusted according to the background state, so that the applicability of interference identification of space targets with different sizes and different intensities is improved, the interference resistance is high, and various detection waveforms can be processed.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:
FIG. 1 is a flow chart of a method for removing interference of a space target detected by incoherent scattering radar in an embodiment of the invention;
fig. 2 is an algorithm flow chart of a method for removing interference of a space target detected by incoherent scattering radar in an embodiment of the invention.
Detailed Description
The present application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to more clearly describe the method for removing the interference of the spatial target in the incoherent scattering radar detection of the present invention, each step in the embodiment of the present invention is described in detail below with reference to fig. 1 and 2.
The method for removing the interference of the space target of the incoherent scattering radar detection comprises the steps S1 to S4, wherein the steps are described in detail as follows:
incoherent scattering radar is distributed in the detection area, and comprises 8320 transceiver components, 260 antenna subarrays, 4MW of peak transmitting power and 46dB of antenna gain. Transmitting signals in real time, and receiving ionosphere detection echo signals; the radar transmits back the down-converted and analog-to-digital converted sampling signals through the optical fiber and gathers the down-converted and analog-to-digital converted sampling signals to the upper computer, and the upper computer executes the method from the step S1 to the step S5 to obtain detection signals for removing the interference of the space target.
Step S1, calculating a power profile according to ionosphere detection signals, and accumulating the power profile to obtain an accumulated power profile;
step S2, if no background sample exists, setting an initial background sample value to be zero, otherwise, calculating the relative variation of the current accumulated power profile and the background sample, and taking the relative variation as an object to be detected;
step S3, designing a constant false alarm detector;
in this embodiment, the step S3 specifically includes:
calculating the number of signal sampling points in a pulse width according to the pulse width and sampling time interval of the detection signal;
setting the number of the front edges of the protection units, the number of the rear edges of the protection units, the number of the front edges of the reference units and the number of the rear edges of the reference units of the constant false alarm detector as signal sampling points;
taking the mean value of the reference unit as a noise reference value;
in this embodiment, the noise reference value is calculated by the following method:
；
wherein,is the sum of the power of the upper edge reference unit, +.>Is the sum of the lower edge reference powers +.>Represents the number of signal samples within a pulse width, < >>Indicate->The first part of the object to be detected>Noise reference value of each distance cell, +.>Representing the relative change in current accumulated power profile versus background samples, +.>Number of serial numbers representing the object to be detected, +.>The number of sequence numbers representing the distance units.
Setting false alarm probability, calculating threshold factor and finishing the design of the constant false alarm detector.
S4, carrying out space target interference identification on the object to be detected through the constant false alarm detector; if the interference exists, recording the position of the space target interference, and entering step S5; if no interference exists, updating the background sample into a current accumulated power profile, and returning to the step S1;
and S5, removing the space target interference according to the position of the space target interference obtained by recognition, and returning to the step S1 until all ionosphere detection signals are processed.
In this embodiment, the removing the spatial target interference is specifically removing a distance unit identified as the spatial target interference from the original detection signal.
Although the steps are described in the above-described sequential order in the above-described embodiments, it will be appreciated by those skilled in the art that in order to achieve the effects of the present embodiments, the steps need not be performed in such order, and may be performed simultaneously (in parallel) or in reverse order, and such simple variations are within the scope of the present invention.
A second embodiment of the present invention is a spatial target interference removal system for incoherent scattering radar detection, the system comprising:
the power profile accumulating module is used for calculating a power profile according to the ionosphere detection signals and accumulating the power profile to obtain an accumulated power profile;
the object to be detected acquisition module is configured to set an initial background sample value to zero if no background sample exists, otherwise, calculate the relative variation of the current accumulated power profile and the background sample, and take the relative variation as the object to be detected;
the constant false alarm detector setting module is used for designing a constant false alarm detector;
in this embodiment, the constant false alarm detector setting module specifically includes:
calculating the number of signal sampling points in a pulse width according to the pulse width and sampling time interval of the detection signal;
setting the number of the front edges of the protection units, the number of the rear edges of the protection units, the number of the front edges of the reference units and the number of the rear edges of the reference units of the constant false alarm detector as signal sampling points;
taking the mean value of the reference unit as a noise reference value;
in this embodiment, the noise reference value is calculated by the following method:
；
wherein,is the sum of the power of the upper edge reference unit, +.>Is the sum of the lower edge reference powers +.>Represents the number of signal samples within a pulse width, < >>Indicate->The first part of the object to be detected>Noise reference value of each distance cell, +.>Representing the relative change in current accumulated power profile versus background samples, +.>Number of serial numbers representing the object to be detected, +.>The number of sequence numbers representing the distance units.
Setting false alarm probability, calculating threshold factor and finishing the design of the constant false alarm detector.
The interference recognition module is configured to recognize space target interference on the object to be detected through the constant false alarm detector; if the space target interference exists, recording the position of the space target interference, and entering an interference removal module; if the space target interference does not exist, updating the background sample into the current accumulated power profile, and returning to the power profile accumulating module;
in this embodiment, the performing, by using the constant false alarm detector, spatial target interference identification on the object to be detected specifically includes:
setting the initial background sample value to be zero, and calculating the relative variation of the current accumulated power profile and the background sampleAs an object to be detected of spatial target interference:
；
；
wherein,represents the->Accumulated power value of individual distance units +.>Representing the total number of ionosphere probe signal profiles detected, for example>Indicate->The +.f. of the accumulated power profile>Values of the individual distance cells; according to the noise reference value->And carrying out space target interference identification through the constant false alarm detector:
the construction criteria are as follows:
；
wherein,is a threshold factor->，/>For false alarm probability, when the criterion is satisfied, determine +.>The distance units are space target interference, and the positions of the space target interference are recorded; if the criterion is not satisfied in all distance units, updating the background sample to the current accumulated power profile +.>。
The interference removing module is configured to remove the space target interference in the detection signal according to the position of the space target interference obtained by recognition, and return to the power profile accumulating module until all ionosphere detection signals are processed
In this embodiment, the removing the spatial target interference is specifically removing, in the original detection signal, a distance unit determined as the spatial target interference.
It will be clear to those skilled in the art that, for convenience and brevity of description, the specific working process of the system described above and the related description may refer to the corresponding process in the foregoing method embodiment, which is not repeated here.
It should be noted that, in the spatial target interference removal system for incoherent scattering radar detection provided in the foregoing embodiment, only the division of the foregoing functional modules is illustrated, and in practical application, the foregoing functional allocation may be performed by different functional modules according to needs, that is, the modules or steps in the foregoing embodiment of the present invention are further decomposed or combined, for example, the modules in the foregoing embodiment may be combined into one module, or may be further split into multiple sub-modules, so as to complete all or part of the functions described above. The names of the modules and steps related to the embodiments of the present invention are merely for distinguishing the respective modules or steps, and are not to be construed as unduly limiting the present invention.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the storage device and the processing device described above and the related description may refer to the corresponding process in the foregoing method embodiment, which is not repeated herein.
Those of skill in the art will appreciate that the various illustrative modules, method steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the program(s) corresponding to the software modules, method steps, may be embodied in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. To clearly illustrate this interchangeability of electronic hardware and software, various illustrative components and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as electronic hardware or software depends upon the particular application and design constraints imposed on the solution. Those skilled in the art may implement the described functionality using different approaches for each particular application, but such implementation is not intended to be limiting.
The terms "first," "second," and the like, are used for distinguishing between similar objects and not for describing a particular sequential or chronological order.
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/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/apparatus.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
Claims (10)
1. A method for removing interference of a spatial target detected by an incoherent scattering radar, the method comprising:
step S1, calculating a power profile according to ionosphere detection signals, and accumulating the power profile to obtain an accumulated power profile;
step S2, if no background sample exists, setting an initial background sample value to be zero, otherwise, calculating the relative variation of the current accumulated power profile and the background sample, and taking the relative variation as an object to be detected;
step S3, designing a constant false alarm detector;
s4, carrying out space target interference identification on the object to be detected through the constant false alarm detector; if the interference exists, recording the position of the space target interference, and entering step S5; if no interference exists, updating the background sample into a current accumulated power profile, and returning to the step S1;
and S5, removing the space target interference according to the position of the space target interference obtained by recognition, and returning to the step S1 until all ionosphere detection signals are processed.
2. The method for removing spatial target interference for incoherent scattering radar detection according to claim 1, wherein the step S3 is specifically:
calculating the number of signal sampling points in a pulse width according to the pulse width and sampling time interval of the detection signal;
setting the number of the front edges of the protection units, the number of the rear edges of the protection units, the number of the front edges of the reference units and the number of the rear edges of the reference units of the constant false alarm detector as signal sampling points;
taking the mean value of the reference unit as a noise reference value;
setting false alarm probability, calculating threshold factor and finishing the design of the constant false alarm detector.
3. The method for removing spatial target interference for incoherent scattering radar detection according to claim 2, wherein the noise reference value is calculated by:
；
wherein,is the sum of the power of the upper edge reference unit, +.>Is the sum of the lower edge reference powers +.>Represents the number of signal samples within a pulse width, < >>Indicate->The first part of the object to be detected>Noise reference for individual distance unitsThe value of the sum of the values,representing the relative change in current accumulated power profile versus background samples, +.>Number of serial numbers representing the object to be detected, +.>The number of sequence numbers representing the distance units.
4. The method for removing spatial target interference in incoherent scattering radar detection according to claim 3, wherein the method for identifying spatial target interference on the object to be detected by the constant false alarm detector comprises the following steps:
if no background sample exists, setting the initial background sample value to be zero, otherwise, calculating the relative variation of the current accumulated power profile and the background sampleAs an object to be detected of spatial target interference:
；
；
wherein,represents the->Accumulated power value of individual distance units +.>Representing the total number of ionosphere probe signal profiles detected, for example>Indicate->The +.f. of the accumulated power profile>Values of the individual distance cells; according to the noise reference value->And carrying out space target interference identification through the constant false alarm detector:
the construction criteria are as follows:
；
wherein,is a threshold factor->，/>For false alarm probability, when the criterion is satisfied, determine +.>The distance units are space target interference, and the positions of the space target interference are recorded; if the criterion is not satisfied in all distance units, updating the background sample to the current accumulated power profile +.>。
5. The method for removing spatial target interference for incoherent scattering radar detection according to claim 1, wherein the removing of the spatial target interference is specifically removing a distance unit determined as the spatial target interference from the original detection signal.
6. A system for spatial target interference removal for incoherent scattering radar detection, the system comprising:
the power profile accumulating module is used for calculating a power profile according to the ionosphere detection signals and accumulating the power profile to obtain an accumulated power profile;
the object to be detected acquisition module is configured to set an initial background sample value to zero if no background sample exists, otherwise, calculate the relative variation of the current accumulated power profile and the background sample, and take the relative variation as the object to be detected;
the constant false alarm detector setting module is used for designing a constant false alarm detector;
the interference recognition module is configured to recognize space target interference on the object to be detected through the constant false alarm detector; if the space target interference exists, recording the position of the space target interference, and entering an interference removal module; if the space target interference does not exist, updating the background sample into the current accumulated power profile, and returning to the power profile accumulating module;
and the interference removing module is configured to remove the space target interference from the detection signals according to the identified space target interference position, and return to the power profile accumulating module until all ionosphere detection signals are processed.
7. The system for removing spatial target interference for incoherent scattering radar detection according to claim 6, wherein the constant false alarm detector setting module is specifically:
calculating the number of signal sampling points in a pulse width according to the pulse width and sampling time interval of the detection signal;
setting the number of the front edges of the protection units, the number of the rear edges of the protection units, the number of the front edges of the reference units and the number of the rear edges of the reference units of the constant false alarm detector as signal sampling points;
taking the mean value of the reference unit as a noise reference value;
setting false alarm probability, calculating threshold factor and finishing the design of the constant false alarm detector.
8. The system for removing spatial target interference for incoherent scattered radar detection of claim 7, wherein the noise reference value is calculated by:
；
wherein,is the sum of the power of the upper edge reference unit, +.>Is the sum of the lower edge reference powers +.>Represents the number of signal samples within a pulse width, < >>Indicate->The first part of the object to be detected>The noise reference value of the individual distance cells,representing the relative change of the accumulated power profile from the background sample, +.>Number of serial numbers representing the object to be detected, +.>The number of sequence numbers representing the distance units.
9. The system for removing spatial target interference of incoherent scattering radar detection according to claim 8, wherein the spatial target interference identification is performed on the object to be detected by the constant false alarm detector, specifically:
setting the initial background sample value to be zero, and calculating the relative variation of the accumulated power profile and the background sampleAs an object to be detected of spatial target interference:
；
；
wherein,represents the->Accumulated power value of individual distance units +.>Representing the total number of ionosphere probe signal profiles detected, for example>Indicate->The +.f. of the accumulated power profile>Values of the individual distance cells; according to the noise reference value->And carrying out space target interference identification through the constant false alarm detector:
the construction criteria are as follows:
；
wherein,is a threshold factor->，/>For false alarm probability, when the criterion is satisfied, determine +.>The distance units are space target interference, and the positions of the space target interference are recorded; if the criterion is not satisfied in all distance units, updating the background sample to the current accumulated power profile +.>。
10. The system for removing spatial target interference for incoherent scattering radar detection according to claim 9, wherein the removing of the spatial target interference is in particular removing the distance unit determined as the spatial target interference from the original detection signal.
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