A radar detection distance equivalent calculation method for ITM radio wave propagation model correction

Abstract

The application relates to a radar detection distance equivalent calculation method based on an ITM electric wave propagation model correction, which obtains a radar detection distance measured value from a test scene measurement, and then according to a parameter mapping relationship between a simulated target device in the test scene and a real enemy equipment in a real scene, the detection distance of the evaluated radar equipment in the real scene is equivalent calculated after the ITM electric wave propagation model correction, and software implementation is carried out. In the radar detection distance equivalent calculation, the application increases the influence correction of the electric wave propagation attenuation caused by the terrain factors, improves the accuracy of the equivalent calculation, and designs and realizes the software, so as to provide an effective tool for the user to predict the detection distance of the radar equipment in the battlefield environment.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of radar equipment effectiveness evaluation, and particularly relates to a radar equipment detection distance equivalent calculation method based on ITM (International Telecommunication Union) electromagnetic wave propagation model correction. BACKGROUND

[0002] In the evaluation of radar equipment effectiveness, radar detection distance is an important evaluation index. Generally, simulation target equipment is used as a detection target and a jamming signal source of the evaluated radar equipment to measure the detection distance of the radar equipment to the target under non-jamming and jamming conditions, which is defined as a test scene. The radar detection distance measured through the test scene is the detection distance of the radar equipment to the target under the countermeasure condition of the radar equipment and the simulation target equipment. Users are more expected to predict the detection distance of the radar equipment to the real enemy combat target (real enemy target and real enemy radar jamming equipment) under the countermeasure condition of the radar equipment and the real enemy combat target. The countermeasure scene of the radar equipment and the real enemy combat target is defined as a real scene. Currently, the equivalent calculation of the radar detection distance does not consider the influence of electromagnetic wave propagation attenuation or only considers the influence of electromagnetic wave propagation attenuation caused by factors such as atmosphere and weather, and does not consider the influence of electromagnetic wave propagation attenuation caused by terrain factors. SUMMARY

[0003] Technical problems to be solved

[0004] In order to avoid the shortcomings of the prior art, the application provides a radar detection distance equivalent calculation method based on ITM electromagnetic wave propagation model correction.

[0005] Technical scheme

[0006] The radar detection distance equivalent calculation method based on ITM electromagnetic wave propagation model correction is characterized by the following steps:

[0007] Step 1: establishing a radar detection distance equivalent calculation model based on ITM electromagnetic wave propagation model correction under non-jamming condition;

[0008] Step 2: establishing a radar detection distance equivalent calculation model based on ITM electromagnetic wave propagation model correction under support jamming condition;

[0009] Step 3: establishing a radar detection distance equivalent calculation model based on ITM electromagnetic wave propagation model correction under self-defense jamming condition;

[0010] Step 4: packaging an ITM electromagnetic wave propagation coefficient calculation dynamic link library, and realizing the calculation of the propagation attenuation coefficient δ of the radar signal under the ITM electromagnetic wave propagation model by calling the dynamic link library;

[0011] Step 5: design and implement the radar detection distance equivalent calculation software of the ITM electric wave propagation model correction, set the equivalent calculation scene parameters, call the ITM electric wave propagation calculation dynamic link library, the program solves the equivalent calculation model, and displays the equivalent calculation result of the radar detection distance.

[0012] The further technical solution of the application is the radar detection distance equivalent calculation model in step 1:

[0013]

[0014] Wherein, R test is the radar detection distance in the test scene, R real is the radar detection distance in the real scene, σ'' is the radar scattering cross section RCS of the target in the real scene, σ' is the radar scattering cross section RCS of the target in the test scene, and δ is the propagation attenuation coefficient of the radar signal under the ITM electric wave propagation model.

[0015] The further technical solution of the application is the radar detection distance equivalent calculation model in step 2:

[0016]

[0017] Wherein, P' J is the jammer transmitting power in the test support jamming scene, P'' J is the jammer transmitting power in the real support jamming scene, G' J is the jammer antenna gain in the test support jamming scene, G'' J is the jammer antenna gain in the real support jamming scene, R' J is the distance between the jammer and the radar in the test support jamming scene, and R'' J is the distance between the jammer and the radar in the real support jamming scene.

[0018] The further technical solution of the application is the radar detection distance equivalent calculation model in step 3:

[0019]

[0020] A computer system comprises one or more processors, a computer readable storage medium for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the above method.

[0021] A computer readable storage medium stores computer executable instructions, and the instructions are used to implement the above method when executed.

[0022] Advantages

[0023] The application increases the influence correction of the wave propagation attenuation caused by the terrain factors in the radar detection distance equivalent calculation, improves the accuracy of the equivalent calculation, and provides an effective tool for the user to predict the detection distance of the radar equipment in the battlefield environment by designing and implementing the software. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0025] Figure 1 It is an equivalent calculation model framework of the application;

[0026] Figure 2 It is an interference-free scene schematic diagram;

[0027] Figure 3 It is a support interference scene schematic diagram;

[0028] Figure 4 It is a self-defense interference scene schematic diagram;

[0029] Figure 5 It is an equivalent calculation software module composition diagram;

[0030] Figure 6 It is an equivalent calculation software operation flowchart. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the application clearer, the application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and do not limit the application. In addition, the technical features involved in each embodiment of the application described below can be combined with each other as long as they do not conflict with each other.

[0032] The application provides a radar detection distance equivalent calculation method based on ITM wave propagation model correction, which obtains the measured value of the radar detection distance from the test scene measurement, and then according to the parameter mapping relationship between the simulated target equipment in the test scene and the real enemy equipment in the real scene, the detection distance of the evaluated radar equipment in the real scene is equivalent calculated after the ITM wave propagation model correction, and software implementation is carried out.

[0033] The technical scheme of the application comprises the following steps:

[0034] 1) Establishing an ITM wave propagation model correction radar detection distance equivalent calculation model under the condition of no interference;

[0035] 2) Establish the radar detection distance equivalent calculation model of ITM wave propagation model correction under the support of interference conditions;

[0036] 3) Establish the radar detection distance equivalent calculation model of ITM wave propagation model correction under the self-defense interference conditions;

[0037] 4) Package ITM wave propagation coefficient calculation dynamic link library;

[0038] 5) Design and implement the radar detection distance equivalent calculation software of ITM wave propagation model correction.

[0039] Each step is as follows:

[0040] 1) Radar detection distance equivalent calculation model of ITM wave propagation model correction under non-interference conditions (see formula 4)

[0041] According to the radar equation:

[0042]

[0043] The parameters in formula 1 are as follows:

[0044] R: The maximum detection distance of the radar to the target with RCS σ (unit: m);

[0045] P t : Radar transmit power (unit: W);

[0046] G t : Radar antenna gain;

[0047] λ: Radar signal wavelength (unit: m);

[0048] σ: Radar scattering cross section RCS of the target (unit: m 2 );

[0049] S imin : Radar minimum detectable signal power (unit: W).

[0050] Considering the condition of wave attenuation, it is assumed that the detection distance of the radar equipment to the target with RCS σ' (m 2 ) in the test scene is R test (km), and the detection distance of the radar equipment to the target with RCS σ" (m 2 ) in the real scene is R real (km), and the relationship between R real and R test is shown in formula 2:

[0051]

[0052] R real R test The relationship is shown in equation 3:

[0053]

[0054] Thus, the radar detection distance equivalent calculation model of the ITM wave propagation model under the condition of no interference is obtained, as shown in equation 4:

[0055]

[0056] The parameters with the same name in equation 1 in equation 2 have the same meaning, and the other parameters in equation 2 and the parameter explanations of equations 3 and 4 are as follows:

[0057] Parameter Description σ' Radar cross section, RCS, of the target in the test scenario (unit: m 2 )]]> σ" Radar cross section, RCS (unit: m 2 ) of a target in a real scene δ Propagation attenuation coefficient of radar signal under ITM wave propagation model (dB / km) [R test ]]> Radar detection range in test scenario (unit: km) [R real ]]> Radar detection range in real scenario (unit: km)

[0058] 2) The radar detection distance equivalent calculation model of the ITM wave propagation model under the condition of supporting interference (see equation 13)

[0059] The jammer signal power received by the radar equipment is shown in equation 5:

[0060]

[0061] P J-R : The jammer signal power received by the radar (unit: W);

[0062] P J : The transmission power of the jammer (unit: W);

[0063] G J : The antenna gain of the jammer;

[0064] G RJ : The radar antenna gain in the direction of the jammer;

[0065] λ: The wavelength of the interference signal (unit: m);

[0066] R J : The distance between the jammer and the radar (unit: m).

[0067] The target echo signal power received by the radar is shown in equation 6:

[0068]

[0069] P S-R : The target echo signal power received by the radar;

[0070] P t : The transmission power of the radar (unit: W);

[0071] G t: radar antenna gain in the target direction;

[0072] λ: radar signal wavelength (unit: m);

[0073] σ: radar cross section (RCS) of the target (unit: m 2 );

[0074] R: distance between radar and target (unit: m).

[0075] Under the condition of supporting jamming, the jamming-to-signal ratio P J-R / P S-R at the radar is as shown in formula 7:

[0076]

[0077] Considering the attenuation factor of the radio wave, it is assumed that the propagation attenuation coefficient of the radar signal and the jamming signal (assuming that the radar signal frequency and the jamming signal frequency are consistent) is δ (dB / km). For the single-pass jamming signal, the jammer signal power P′ J-R received by the radar equipment is as shown in formula 8:

[0078]

[0079] For the double-pass radar signal, the target echo signal power P′ S-R received by the radar equipment is as shown in formula 9:

[0080] P′ S-R = P S-R × 10 -0.2δR (formula 9)

[0081] Considering the attenuation factor of the radio wave, the jamming-to-signal ratio P′ J-R / P′ S-R at the radar is as shown in formula 10:

[0082]

[0083] It is assumed that the detection distance of the radar equipment being evaluated in the test scenario to the simulated target detection target (radar cross section σ′) is R tes , and the detection distance of the radar equipment being evaluated in the real scenario to the real detection target (radar cross section σ″) is R real , and the jamming-to-signal ratio at the radar in the two cases is equal to the radar detection jamming-to-signal ratio.

[0084] Therefore, under the condition of supporting jamming, R test and R real have the following relationship under the consideration of the attenuation factor of the radio wave, as shown in formula 11:

[0085]

[0086] Assuming that the relative positions of the evaluated radar, the detected target and the jamming equipment in the test scene and the real scene are consistent, then G' RJ =G" RJ The formula 12 is obtained:

[0087]

[0088] Thus, the calculation formula of the radar detection distance under the condition of support jamming considering the ITM wave attenuation factor is obtained, as shown in formula 13:

[0089]

[0090] The parameters in formula 13 are as follows:

[0091]

[0092]

[0093] 3) The equivalent calculation model of the radar detection distance under the condition of self-defense jamming with the ITM wave propagation model being modified (see formula 14)

[0094] Under the condition of wave attenuation, when self-defense jamming is considered, R test =R' J , R real =R" J The calculation formula of the radar detection distance under the condition of self-defense jamming considering the ITM wave attenuation factor is obtained by substituting formula 13, as shown in formula 14:

[0095]

[0096] The parameters in formula 14 are as follows:

[0097] Parameter Description [R real ]] Detection range of radar to target with RCS σ" in real self-protection jamming scenario (km) [R test ]] Detection range of radar to target with RCS σ' in test self-protection jamming scenario (km) P' J ]] Jammer transmit power in test self-protection jamming scenario (arbitrary power unit) P" J ]] Under the real self-defense jamming scenario, the jammer transmitting power (with P' J the same power unit) G′ J ]]> Jammer antenna gain in test self-protection jamming scenario G" J ]]> Jammer antenna gain in real self-protection jamming scenario σ' Radar cross section, RCS, of the target in the test scenario (unit: m 2 )]]> σ" Radar cross section, RCS (unit: m 2 ) of a target in a real scenario δ Propagation attenuation coefficient of radar signal under ITM wave propagation model (dB / km)

[0098] 4) Packaging ITM wave propagation calculation dynamic link library

[0099] The calculation of the propagation attenuation coefficient δ of the radar signal under the ITM wave propagation model is the key to the calculation of the radar detection distance by using formula 4, formula 13 and formula 14.

[0100] The algorithm program of the ITM wave propagation model is packaged as a dynamic link library, and the calculation of the propagation attenuation coefficient δ of the radar signal under the ITM wave propagation model is realized by calling the dynamic link library.

[0101] The main parameters of the IMT model include: frequency, antenna height, antenna polarization mode, irregular terrain parameters, climate type, surface refractive index, dielectric constant, conductivity, etc., and the main parameter table of the IMT model is shown in Table 1.

[0102] Table 1 Main parameter table of IMT model

[0103]

[0104]

[0105] 5) Software implementation of equivalent calculation

[0106] An "ITM wave propagation model correction radar detection distance equivalent calculation software" is designed and implemented, by setting the equivalent calculation scene parameters, calling the ITM wave propagation calculation dynamic link library, the program solves the equivalent calculation model, and displays the equivalent calculation result of the radar detection distance.

[0107] Embodiment 1:

[0108] The equivalent calculation software disclosed by the application comprises the following operation steps:

[0109] 1) Open the equivalent calculation software

[0110] 2) Select the scene interference condition type

[0111] The optional type is no interference, support interference or self-defense interference;

[0112] 3) Enter the radar detection distance under the test scene

[0113] If no interference condition is selected in step 2), R in formula 4 is entered test ;

[0114] If support interference is selected in step 2), R in formula 13 is entered test ;

[0115] If self-defense interference is selected in step 2), R in formula 14 is entered test .

[0116] 4) Set the scene parameters

[0117] The no interference condition scene needs to be set according to formula 4: the radar scattering cross section σ' of the target in the test scene, the radar scattering cross section σ" of the target in the real scene.

[0118] The support interference condition scene needs to be set according to formula 13: the radar scattering cross section σ' of the target in the test scene, the radar scattering cross section σ" of the target in the real scene, the interference equipment transmitting power P' in the test scene J, the jammer's transmit power P" in the real scenario J , the jammer's antenna gain G' in the test scenario J , the jammer's antenna gain G" in the real scenario J , the distance R' between the jammer and the radar in the test scenario J , the distance R" between the jammer and the radar in the real scenario J .

[0119] The self-defense jamming condition scenario is set according to formula 14: the radar scattering cross section σ' of the target in the test scenario, the radar scattering cross section σ" of the target in the real scenario, the jammer's transmit power P' in the test scenario J , the jammer's transmit power P" in the real scenario J , the jammer's antenna gain G' in the test scenario J , the jammer's antenna gain G" in the real scenario J ,.

[0120] 5) Set the ITM propagation model parameters

[0121] Set the radar signal frequency, antenna height, antenna polarization mode, irregular terrain parameters, climate type, ground refraction index, dielectric constant, conductivity and other parameters.

[0122] 6) Submit the calculation

[0123] 7) The software calculates and displays the results

[0124] The software calls the ITM propagation model dynamic link library to calculate the attenuation coefficient δ (dB / km) of the radar signal, according to the aforementioned equivalent calculation model, uses the "bisection method" to iteratively calculate the equivalent calculation results and displays them.

[0125] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application.

Claims

1. A radar detection range equivalent extrapolation method for ITM radio wave propagation model correction, characterized by The steps are as follows: Step 1: Establish the radar detection distance equivalent calculation model of the ITM wave propagation model under the condition of no interference; wherein, Radar detection range in the test scenario, , Radar cross section, RCS, of the target in the real scenario, Radar cross section, RCS, of the target in the test scenario, Propagation attenuation coefficient for radar signals under the ITM wave propagation model Step 2: Establish the radar detection distance equivalent calculation model of the ITM wave propagation model under the condition of supporting interference; wherein, is the jammer transmit power in a test aided jamming scenario, is the jammer transmit power in a real aided jamming scenario, is the jammer antenna gain in a test aided jamming scenario, is the jammer antenna gain in a real aided jamming scenario, is the distance between the jammer and the radar in a test aided jamming scenario, is the distance between the jammer and the radar in a real aided jamming scenario; Step 3: Establish the radar detection distance equivalent calculation model of the ITM wave propagation model under the condition of self-defense interference; Step 4: encapsulating the ITM electric wave propagation coefficient calculation dynamic link library, and realizing the calculation of the propagation attenuation coefficient of the radar signal under the ITM electric wave propagation model by calling the dynamic link library ; Step 5: Design and implement the "ITM wave propagation model modified radar detection distance equivalent calculation software", set the equivalent calculation scene parameters, call the ITM wave propagation calculation dynamic link library, solve the equivalent calculation model, and display the equivalent calculation results of the radar detection distance.

2. A computer system, characterized by Comprise: One or more processors, a computer readable storage medium for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the method of claim 1.

3. A computer-readable storage medium, characterized in that Computer executable instructions are stored, which are used to implement the method of claim 1 when executed.

Images