CN113433518A - Dual-mode radar target echo digital simulation and discovery probability calculation method thereof - Google Patents
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Abstract
The invention discloses a dual-mode radar target echo digital simulation and a discovery probability calculation method thereof, which relate to the technical field of radar system simulation and comprise a radar echo simulation platform used for simulating the generation and processing of target echo signals, an echo simulation module used for converting target information into corresponding information under a polar coordinate system, a system control module used for controlling the current platform to work, a parameter setting module used for setting related parameters, an IP setting module used for setting the acquisition of target echo information from different existing source machines, a target discovery probability calculation module which can completely simulate the generation of targets and the discovery process of the targets by radars through a remote working mode and a local working mode, a mode of calculating RCS values through a Swinglin model calculation module and a database query module and a mode of conveniently looking up a table or a Swinglin model calculation module technology by a user, and the rapid calculation of the target discovery probability is realized.
Description
Technical Field
The invention relates to the technical field of radar system simulation, in particular to a method for simulating a target echo digital of a dual-mode radar and calculating the discovery probability of the target echo digital.
Background
Simulation research is highly emphasized by countries all over the world, a reasonable radar mathematical model is established to be approximate to reality, so that powerful data support can be provided for system performance, the simulation research on the phased array can be traced back to 1982, and a simulation book written in R.L. Michelle discusses feasibility and a basic method of phased array radar simulation in detail, the study explains that the reasonability of the model and the fidelity of a simulation environment can influence the accuracy of radar signals to a great extent, along with the maturity of a corresponding simulation theory, the simulation technology of the phased array radar is continuously improved and developed, the domestic Wang national jade develops research work on the phased array radar simulation technology in documents, explains the methods of electronic reconnaissance system modeling simulation, radar and radar countermeasure system function simulation and video signal simulation modeling, and the book also discusses how to reasonably establish a phased array antenna model and a beam model, computer simulation is a new simulation mode which is always concerned by all countries in the world from beginning to be proposed to the present, and along with the rapid development of computer systems, simulation on a computer gradually becomes a mainstream simulation form in the last 90 th century, along with the continuous research on radar simulation by using computer software resources, a plurality of computer simulation technologies are continuously proposed, wherein simulation is a product of the combination of the simulation technology and the radar technology, the radar is firstly modeled, and then a dynamic working process is reproduced on the computer, specifically, a simulation object is a radar signal comprising a radar body (hardware and software), a radar target and a target environment, and a simulation means is a computer comprising hardware and software.
In the patent aspect, the chinese invention patent application with the application number CN201710621896.9 provides a method for constructing a radar simulation model based on a general radar simulation module, target data of the method are all provided from the outside and cannot be generated autonomously, and certain limitations exist, when a Swerling model is used for calculating a target discovery probability in the chinese invention patent with the application number CN201710337920.6, a situation of complex calculation amount exists, the present invention realizes the rapid calculation of the target discovery probability through a preset parameter form on the basis, and meanwhile, a way of directly inquiring an RCS value from a database and calculating the discovery probability is provided.
Disclosure of Invention
The invention aims to provide a dual-mode radar target echo digital simulation and a discovery probability calculation method thereof, which solve the problems in the background art.
In order to achieve the purpose, the invention is realized by the following technical scheme: a dual-mode radar target echo digital simulation, comprising:
the radar echo simulation platform is used for simulating generation and processing of a target echo signal;
the echo simulation module is used for converting the target information into corresponding information under a polar coordinate system;
the system control module is used for controlling the current platform to work;
the parameter setting module is used for setting related parameters;
the IP setting module is used for setting the acquisition of target echo information from different existing source machines;
and the target discovery probability calculation module is used for acquiring the discovery probability of the current type of target and calculating the value of the RCS.
The output of radar echo analog simulation platform is connected with the input bidirectional signal of echo analog module, the output of radar echo analog simulation platform is connected with the input bidirectional signal of system control module, the output of radar echo analog simulation platform is connected with the input bidirectional signal of parameter setting module, the output of radar echo analog simulation platform is connected with the input bidirectional signal of IP setting module, the output of radar echo analog simulation platform is connected with the input bidirectional signal of target discovery probability calculation module.
Further, the target discovery probability calculation module comprises a schweilin model calculation module and a database query module, and an output end of the schweilin model calculation module is in bidirectional signal connection with an input end of the database query module.
Furthermore, the echo simulation module comprises a target echo receiving module and a clutter receiving module, and the output end of the echo receiving module is connected with the input end of the clutter receiving module through bidirectional signals.
Furthermore, the system control module comprises a control module, a track control module and a radar parameter setting module, wherein the output end of the control module is in signal connection with the input end of the track control module, and the output end of the control module is in signal connection with the input end of the radar parameter setting module.
Furthermore, the parameter setting module comprises a radar position detection module and an error setting module, the radar position detection module is used for detecting wave position information of a radar, and the output end of the error setting module is in signal connection with the input end of the radar position detection module.
Further, the database query module is used for acquiring corresponding RCS values from a database file according to parameters input by the interface, including a target type, an azimuth angle and a pitch angle.
Further, the value-dependent probability density function of the RCS of the swervein I/II model is:
further, the value-dependent probability density function of the RCS of the swervein III/IV model is:
a dual-mode radar target echo digital simulation and discovery probability calculation method comprises the following steps:
the method comprises the steps that firstly, a number setting module sets an IP address and a port in a remote mode, then receives target digital information transmitted by a remote end according to a preset protocol, an echo simulation module receives the target digital information, after verification is passed, the obtained digital information is converted into digital information required in the protocol, the digital information is converted into corresponding target information in a polar coordinate system, and in a local mode, the echo simulation module generates the target information according to the requirement set by an interface and converts the target information into corresponding target information in the polar coordinate system;
the corresponding target information and the wave position information of the radar are correlated in a timestamp mode, and for the target information corresponding to the same moment and the wave position information of the radar, the distance, the direction and the elevation angle of the target information and the wave position information of the radar are judged, if the distance, the direction and the elevation angle are within a specified range, the target information corresponding to the current moment can be determined to be found by a radar position detection module, and the target information found by the radar position detection module is sent to signal processing;
when the radar position detection module does not detect wave position information of the radar, simulating by adopting a mode of calculation of a Schweilin model or database query, setting a calculation RCS type in a parameter control module, calculating an RCS value of the target, calculating a signal-to-noise ratio (SNR) of the target by a formula, calculating the SNR, and calculating a corresponding discovery probability by a preset false alarm probability and the calculated SNR in an interpolation mode;
step four, signal processing: and sending the target information found by the radar position detection module to signal processing.
The invention provides a dual-mode radar target echo digital simulation and a discovery probability calculation method thereof. The method has the following beneficial effects:
(1) according to the method for the digital simulation of the dual-mode radar target echo and the calculation of the discovery probability of the dual-mode radar target echo, the generation of a target and the discovery process of the radar to the target can be completely simulated through a remote working mode and a local working mode.
(2) According to the dual-mode radar target echo digital simulation and discovery probability calculation method, the RCS value is calculated through the two modes of the Schwerlin model calculation module and the database query module, and a user can conveniently and rapidly calculate the target discovery probability through a table look-up mode or a Schwerlin model calculation module technology mode.
Drawings
FIG. 1 is a general system diagram of a dual-mode radar target echo digital simulation and a discovery probability calculation method thereof according to the present invention;
FIG. 2 is a schematic diagram of an echo simulation module of the dual-mode radar target echo digital simulation and the discovery probability calculation method thereof according to the present invention;
FIG. 3 is a schematic diagram of a system control module of the dual-mode radar target echo digital simulation and discovery probability calculation method of the present invention;
FIG. 4 is a schematic diagram of a parameter setting module of a dual-mode radar target echo digital simulation and discovery probability calculation method of the invention;
FIG. 5 is a schematic diagram of a target discovery probability calculation module of the dual-mode radar target echo digital simulation and discovery probability calculation method thereof according to the present invention;
FIG. 6 is a diagram of the connection relationship between application software modules of the dual-mode radar target echo digital simulation and the discovery probability calculation method of the present invention;
FIG. 7 is a parameter description of a signal-to-noise ratio calculation formula of a dual-mode radar target echo digital simulation and discovery probability calculation method of the present invention;
FIG. 8 is a target discovery probability calculation flow of the dual-mode radar target echo digital simulation and discovery probability calculation method of the present invention;
fig. 9 is a preset comparison table of false alarm rate and target discovery probability for the dual-mode radar target echo digital simulation and the discovery probability calculation method thereof according to the present invention.
In the figure: 1. a radar echo simulation platform; 2. an echo simulation module; 3. a system control module; 4. a parameter setting module; 5. an IP setting module; 6. and a target discovery probability calculation module.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments.
Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The invention will be further illustrated with reference to the following examples and drawings:
referring to fig. 1-9, the present invention provides a technical solution: a dual-mode radar target echo digital simulation, comprising:
the radar echo simulation platform 1 is used for simulating generation and processing of a target echo signal;
the echo simulation module 2 is used for converting the target information into corresponding information under a polar coordinate system;
the system control module 3 is used for controlling the current platform to work;
the parameter setting module 4 is used for setting related parameters;
the IP setting module 5 is used for setting the acquisition of target echo information from different existing source machines;
and a target discovery probability calculation module 6, configured to obtain a discovery probability of a current type of target, and calculate a value of the RCS.
Output and echo analog simulation module 2's the input both-way signal connection of radar echo analog simulation platform 1, radar echo analog simulation platform 1's the output and the input both-way signal connection of system control module 3, radar echo analog simulation platform 1's the output and the input both-way signal connection of parameter setting module 4, radar echo analog simulation platform 1's the output and the input both-way signal connection that IP set up module 5, radar echo analog simulation platform 1's the output and the input both-way signal connection of target discovery probability calculation module 6, the teleworking mode: receiving target digital information sent by a remote machine, wherein the type of the message is UDP message, the frequency is 20Hz, the data is stored in a corresponding structural body after the message is analyzed and the data is processed, the found target data information is sent to a signal processor through a parameter setting module 4, and the local working mode is as follows: the target data information is generated locally, is formed by input of an operator through an interface, and is sent to the signal processor through the parameter setting module 4.
Specifically, the target discovery probability calculating module 6 includes a swerve model calculating module and a database query module, and an output end of the swerve model calculating module is in bidirectional signal connection with an input end of the database query module.
Specifically, the echo simulation module 2 comprises a target echo receiving module and a clutter receiving module, the output end of the echo receiving module is in bidirectional signal connection with the input end of the clutter receiving module, a corresponding target track is generated on a drawing panel provided by a platform according to preset target parameters in a local mode, so that corresponding digital information is generated, and the target echo receiving module and the clutter receiving module are connected with the echo simulation module 2 in bidirectional signal connection.
Specifically, the system control module 3 comprises a control module, a track control module and a radar parameter setting module, wherein the output end of the control module is in signal connection with the input end of the track control module, the output end of the control module is in signal connection with the input end of the radar parameter setting module, and the system control module 3 is mainly used for controlling the current working mode and track intervention of the system and starting and stopping the platform.
Specifically, the parameter setting module 4 includes a radar position detection module and an error setting module, the radar position detection module is used for detecting wave position information of the radar, and an output end of the error setting module is in signal connection with an input end of the radar position detection module.
Specifically, the database query module is used for acquiring corresponding RCS values from a database file according to parameters input by the interface, including a target type, an azimuth angle and a pitch angle.
Specifically, the Schweilin model calculation module comprises a Schweilin I/II model and a Schweilin III/IV model.
Specifically, the probability density function associated with the RCS values of the swervin I/II model is:
the Swinglin I/II model is a Rayleigh model, a slowly fluctuating model that is generally applicable to rough surfaces or large numbers of random scatterers, where
The average value in the whole process of the target fluctuation is obtained, and a corresponding inverse function formula is obtained according to the probability formula:
σ obeys a uniform distribution of 0 to 1.
Specifically, the value-dependent probability density function of the RCS of the swervein III/IV model is:
the Swinglin III/IV model obeys chi-square distribution, is more suitable for a target consisting of a large scatterer and a plurality of small scatterers or a situation that the change of the large scatterer is small in azimuth, is a fast fluctuation model, because the inverse function of the probability density function is not easy to obtain, the rounding off method is adopted for simulation, and the probability density function is assumed to be in a limited region [ a, b ]]Above is [0, max]The steps of (1) are as follows: 1) generating a pair of (0,1) distributed random numbers mu 1, mu 2, 2), calculating the value range [ a, b ] of the unknown quantity X according to the mu 1]A random value within 3), calculate y for x according to the formula, and calculate an expectation by μ 2 × max, 4), if
Then the desired random number is received with an RCS value of
Otherwise, rejecting the point and recalculating.
A dual-mode radar target echo digital simulation and discovery probability calculation method comprises the following steps:
the method comprises the steps that firstly, a number setting module 4 sets an IP address and a port in a remote mode, then receives target digital information transmitted by a remote end according to a preset protocol, an echo simulation module 2 receives the target digital information, after verification is passed, the obtained digital information is converted into digital information required in the protocol, the digital information is converted into corresponding target information in a polar coordinate system, and in a local mode, the echo simulation module 2 generates the target information according to the requirement set by an interface and converts the target information into corresponding target information in the polar coordinate system;
the corresponding target information and the wave position information of the radar are correlated in a timestamp mode, and for the target information corresponding to the same moment and the wave position information of the radar, the distance, the direction and the elevation angle of the target information and the wave position information of the radar are judged, if the distance, the direction and the elevation angle are within a specified range, the target information corresponding to the current moment can be determined to be found by a radar position detection module, and the target information found by the radar position detection module is sent to signal processing;
step three, calculating the discovery probability of the target, namely when the radar position detection module does not detect the wave position information of the radar, simulating by adopting a mode of calculation of a Schweilin model or database query, setting the type of RCS in the parameter control module 4, calculating the RCS value of the target, and then calculating the SNR of the target by a formula, wherein the SNR calculation formula is as follows:
the value of the signal-to-noise ratio is assumed to be snr, the false alarm probability is 0.001, the corresponding upper and lower bounds of the current signal-to-noise ratio in the table are snr _ upper and snr _ lower, and the corresponding upper and lower bounds of the discovery probability are pd _ upper and pd _ lower.
Step four, signal processing: and sending the target information found by the radar position detection module to signal processing.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the inventive concept of the present invention, which falls into the protection scope of the present invention.
Claims (10)
1. A dual-mode radar target echo digital simulation, comprising:
the radar echo simulation platform (1) is used for simulating generation and processing of a target echo signal;
the echo simulation module (2) is used for converting the target information into corresponding information under a polar coordinate system;
the system control module (3) is used for controlling the current platform to work;
the parameter setting module (4) is used for setting related parameters;
the IP setting module (5) is used for setting target echo information acquired from different existing source machines;
and a target discovery probability calculation module (6) for acquiring the discovery probability of the current type of target and calculating the value of the RCS.
The output of radar echo simulation platform (1) and the input both-way signal connection of echo simulation module (2), the output of radar echo simulation platform (1) and the input both-way signal connection of system control module (3), the output of radar echo simulation platform (1) and the input both-way signal connection of parameter setting module (4), the output of radar echo simulation platform (1) and the input both-way signal connection of IP setting module (5), the output of radar echo simulation platform (1) and the input both-way signal connection of target discovery probability calculation module (6).
2. A dual-mode radar target echo digital simulation according to claim 1, characterized in that: the target discovery probability calculation module (6) comprises a Weilin model calculation module and a database query module, and the output end of the Weilin model calculation module is in bidirectional signal connection with the input end of the database query module.
3. A dual-mode radar target echo digital simulation according to claim 1, characterized in that: the echo simulation module (2) comprises a target echo receiving module and a clutter receiving module, and the output end of the echo receiving module is connected with the input end of the clutter receiving module through bidirectional signals.
4. A dual-mode radar target echo digital simulation according to claim 1, characterized in that: the system control module (3) comprises a control module, a track control module and a radar parameter setting module, wherein the output end of the control module is in signal connection with the input end of the track control module, and the output end of the control module is in signal connection with the input end of the radar parameter setting module.
5. A dual-mode radar target echo digital simulation according to claim 1, characterized in that: the parameter setting module (4) comprises a radar position detection module and an error setting module, the radar position detection module is used for detecting wave position information of a radar, and the output end of the error setting module is in signal connection with the input end of the radar position detection module.
6. A dual-mode radar target echo digital simulation according to claim 1, characterized in that: the database query module is used for acquiring corresponding RCS values from a database file according to parameters input by the interface, including target types, azimuth angles and pitch angles.
7. A dual-mode radar target echo digital simulation according to claim 1, characterized in that: the Swingle model calculation module comprises a Swingle I/II model and a Swingle III/IV model.
8. A dual mode radar target echo digital simulation according to claim 7, wherein: the value-dependent probability density function of the RCS of the Swingle I/II model is:
9. the dual-mode radar target echo digital simulation of claim 7, wherein: the value-dependent probability density function of the RCS of the Swingle III/IV model is:
10. a dual-mode radar target echo digital simulation and a discovery probability calculation method thereof, characterized in that the dual-mode radar target echo digital simulation according to any one of claims 1 to 9 is used, comprising the following steps:
s1, receiving target and clutter digital information transmitted from a far end or generated locally, wherein the number setting module (4) sets an IP address and a port in a remote mode, then receives the target digital information transmitted from the far end according to a preset protocol, the echo simulation module (2) receives the target digital information, after the verification is passed, the obtained digital information is converted into the digital information required in the protocol, then the digital information is converted into the corresponding target information under a polar coordinate system, and in a local mode, the echo simulation module (2) generates the target information according to the requirement set by an interface and converts the target information into the corresponding target information under the polar coordinate system;
s2, the radar simulation platform carries out wave position arrangement and simulates a target discovery process, wherein corresponding target information and wave position information of the radar are correlated in a timestamp mode, and for the target information and the wave position information of the radar corresponding to the same moment, the target information corresponding to the current moment can be determined to be discovered by the radar position detection module by judging the distance, the direction and the elevation angle of the target information and the wave position information of the radar corresponding to the same moment if the target information and the wave position information are within a specified range;
s3, calculating the discovery probability of the target, namely, when the radar position detection module does not detect the wave position information of the radar, simulating by adopting a mode of calculation of a Schweilin model or database query, setting the type of the calculated RCS in the parameter control module (4), calculating the RCS value of the target, calculating the SNR of the target by a formula, calculating the SNR of the target, and calculating the corresponding discovery probability by a preset false alarm probability and the calculated SNR in an interpolation mode after calculating the SNR;
s4, signal processing: and sending the target information found by the radar position detection module to signal processing.
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| CN113640760A (en) * | 2021-10-14 | 2021-11-12 | 中国人民解放军空军预警学院 | Radar discovery probability evaluation method and equipment based on air situation data |
| CN113640760B (en) * | 2021-10-14 | 2022-02-22 | 中国人民解放军空军预警学院 | Radar discovery probability evaluation method and equipment based on air situation data |
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