Radar position simulation system based on GIS (Geographic Information System)

Abstract

The invention discloses a GIS (Geographic Information System)-based radar position simulation system, which is used for radar position simulation investigation and comprises a coordinate conversion unit for generating a polar coordinate system taking a radar position as an original point according to GIS data; a shielding angle processing clutter RCS calculation unit, wherein the calculation unit is used for calculating the height parameter and the shielding angle of the radar in the polar coordinate system; and the ground clutter intensity calculation unit is used for generating ground clutter signal levels according to the ground clutter distribution characteristics of the GIS data. For a random sequence unit for simulating radar position ground demonstration training, generating an analog ground clutter random sequence conforming to GIS ground feature characteristics according to a pilot scenario, and performing I / Q conversion on the random sequence to obtain an orthogonal digital signal; the amplitude modulation unit is used for carrying out level amplitude conversion on the ground clutter radar signal and the orthogonal digital signal sent by the preceding stage; and the ground clutter generation unit is used for performing comprehensive calculation by combining data of an azimuth angle and a shielding angle formed by the radar erection height and a ground object to obtain ground clutter signal voltage according with ground clutter distribution characteristics.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of microwave radio frequency, in particular to a radar position simulation system based on GIS. BACKGROUND

[0002] Radar air detection has the characteristics of long detection distance, all-weather, etc., especially phased array radar has the characteristics of flexible detection, multi-dimensional coordinates, high data rate, strong anti-interference ability, etc., and is widely used in national defense, civil facility security protection and other fields. Various types of radar have become the main equipment for early warning, guidance, measurement and other fields in the military field. How to use GIS software information to carry out radar training and simulate rapid deployment is a new research topic. The tactical and technical training of radar is generally trained in one place, and after changing the position, it must be retrained. The traditional way of rapid combat deployment of radar must use a large amount of manpower and material resources to carry out on-site survey and calculation, and then carry out multi-point screening to determine the new radar position. SUMMARY

[0003] In view of the problems in the prior art, the present application aims to provide a radar position simulation system based on GIS, which uses GIS information to simulate the deployment position, and uses the real environment as the background to guide the simulation of meteorological clutter, chaff interference echo, sea clutter and active jamming information, including suppression jamming, false target deception jamming and other elements, which has practical significance for radar countermeasures. In particular, the present application provides help for the rapid selection and verification of the simulation position, and saves a large amount of manpower and material resources.

[0004] The technical scheme of the present application is as follows:

[0005] The radar position simulation system based on GIS comprises:

[0006] A coordinate conversion unit, which generates a polar coordinate system with the radar position as the origin according to GIS data;

[0007] A shadow angle processing clutter RCS calculation unit, which calculates the radar elevation angle corresponding to the ground object higher than the radar origin, i.e. the shadow angle, according to the radar height parameter in the polar coordinate system;

[0008] A ground clutter intensity calculation unit, which generates the ground clutter signal level according to the area, light intensity, depth width information of the ground clutter distribution characteristics of the GIS data;

[0009] A random sequence unit automatically generates a random sequence of simulated ground clutter in accordance with the ground object distribution area, ground object height and reflection intensity of the guide training plan, and performs I / Q conversion on the random sequence to obtain a quadrature digital signal;

[0010] An amplitude modulation unit performs level amplitude conversion on the final ground clutter radar signal and the quadrature digital signal from the previous stage;

[0011] A ground clutter generation unit obtains a ground clutter signal voltage in accordance with the azimuth angle and the shielding angle data of the radar height and the ground object.

[0012] Further, the shielding angle is calculated by the following expression:

[0013]

[0014] Wherein, α is the shielding angle; H 地物海拔 is the ground object altitude; H 雷达 is the radar altitude; H 地曲 is the earth curvature height from the radar station to the ground object; and R is the relative distance between the ground object and the radar station.

[0015] Wherein, the radar altitude and the ground object altitude are provided by GIS, and the relative distance between the ground object and the radar station is calculated based on the positions of the two points provided by GIS.

[0016] Further, the random sequence unit automatically generates a random sequence of simulated ground clutter in accordance with the ground object distribution area, ground object height and reflection intensity of the guide training plan, and specifically includes:

[0017] A target echo simulation component generates various parameters of simulated air targets in accordance with the guide training plan and the instructions of the host computer, uses the DRFM technology, adopts a responding target parameter deception method, and generates a simulated radar target echo signal in a radar radio frequency pulse delay restoration mode.

[0018] A ground object echo simulation component generates simulated ground object echoes under the conditions of the ground object distribution azimuth, distance, depth and mountain peak height of the guide training plan, and uses the FPGA unit to filter the ground clutter.

[0019] A sea clutter simulation component generates simulated sea clutter in different distribution modes under the sea condition of a given area.

[0020] A meteorological clutter generating component generates radar meteorological clutters in accordance with the meteorological grades of the meteorological distribution area of the guide plan, the moving speed conditions and the meteorological characteristics;

[0021] A chaff interference generating component generates radar meteorological clutters in accordance with the chaff distribution area and the meteorological grades, the wind speed conditions and the chaff interference characteristics of the guide plan;

[0022] An active interference simulation component receives the azimuth, the intensity and the interference type of the electronic equipment interference instructions from the host computer in accordance with the guide plan conditions, obtains the radar radio frequency by frequency detection through the MCU, calls the interference instructions in the interference information library, simultaneously calls the corresponding frequency of the local oscillator, mixes the two in the mixer to form the radio frequency interference signal, amplifies the radio frequency interference signal through the power amplifier, and radiates out through the antenna to obtain the radar active electronic interference.

[0023] Beneficial effects:

[0024] The present application mainly solves the following problems:

[0025] 1. Constructing natural, geographical and electromagnetic environment;

[0026] The elevation of the ground objects around the position is automatically generated by using the GIS geographical information and the meteorological data of the selected point, and the omnidirectional ground object sheltering angle is calculated. Various clutters and deception interferences are generated by using the electronic countermeasure technology to construct the complex electromagnetic environment and provide the conditions for the tactical and technical exercises.

[0027] 2. Solving the influence of the radar position on the detection power;

[0028] The wave beam present situation affecting the detection range (the sheltering angle cutting beam) is calculated according to the elevation and the sheltering angle results provided by the GIS to provide the basis for the radar air reconnaissance.

[0029] 3. Verifying the ability of the radar equipment to process various clutters and interferences;

[0030] The common electronic clutters, chaff interferences, meteorological interferences and electronic deception interferences in the complex electromagnetic environment are provided to verify the ability of the radar to process signals.

[0031] 4. Providing the training conditions for the radar operators;

[0032] The electronic countermeasure level of the operators is trained and improved by using the simulation equipment.

[0033] 5. Creating the basic elements of the guide plan of the tactical exercise; providing the conditions for the guide plan of the tactical exercise. BRIEF DESCRIPTION OF DRAWINGS

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a structural diagram of the radar site simulation system based on GIS in this application;

[0036] Figure 2 This is a schematic diagram illustrating the principle of masking angle processing and clutter RCS calculation in the embodiment;

[0037] Figure 3 A schematic diagram illustrating the effect of the shielding angle on radar detection;

[0038] Figure 4 This is a block diagram of the radar site simulation system based on GIS in this application;

[0039] Figure 5 This is a block diagram illustrating the simulated components of the target echo signal in the embodiment.

[0040] Figure 6 This is a block diagram illustrating the principle of sea clutter generation in the embodiment;

[0041] Figure 7 This is a block diagram of the meteorological clutter generation component in the embodiment;

[0042] Figure 8 This is a block diagram of the active electronic interference components in the embodiment. Detailed Implementation

[0043] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Embodiments of the present invention will be described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in the specification of the present invention means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or couplings. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the meaning consistent with their meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0044] A GIS-based radar site simulation system, the simulation system comprising:

[0045] A coordinate transformation unit, which generates a polar coordinate system with the radar site as the origin based on GIS data;

[0046] The masking angle clutter RCS calculation unit calculates the radar elevation angle, i.e., the masking angle, of ground objects that are higher than the radar origin in the polar coordinate system according to the radar elevation parameters.

[0047] The ground clutter intensity calculation unit generates ground clutter signal levels based on the area, light intensity, and depth width information of ground clutter distribution characteristics from GIS data.

[0048] The random sequence unit automatically generates a simulated ground clutter random sequence that conforms to the characteristics of GIS ground features based on the ground feature distribution area, ground feature height, and reflection intensity determined during radar training and drills, and converts the random sequence into an orthogonal digital signal using I / Q conversion.

[0049] An amplitude modulation unit performs level amplitude conversion on the final ground clutter radar signal and the quadrature digital signal sent from the previous stage.

[0050] The ground clutter generation unit combines the azimuth and shielding angle data formed by the radar tower height and ground objects to calculate the ground clutter signal voltage that conforms to the characteristics of ground clutter distribution.

[0051] Furthermore, the occlusion angle is calculated using the following expression:

[0052]

[0053] Where: α is the shading angle; H 地物海拔 H represents the elevation of a ground feature; 雷达 H represents the radar elevation. 地曲 R is the height of the Earth's curvature from the radar station to the ground feature; R is the relative distance between the ground feature and the radar station.

[0054] Among them, the radar altitude and the altitude of the ground features are both provided by GIS, and the relative distance between the ground features and the radar station is the result of the two-point location estimation provided by GIS.

[0055] Furthermore, during radar training exercises, the random sequence unit automatically generates a simulated ground clutter random sequence that conforms to the characteristics of GIS ground features, based on the distribution area, height, and reflection intensity of the ground features as determined by the training scenario. Specifically, this includes:

[0056] The target echo simulation component generates various parameters of the simulated air target according to the guidance scenario and the instructions of the main control computer. It uses DRFM technology and adopts a response-type target parameter deception method to generate simulated radar target echo signals in radar radio frequency pulse delay restoration mode.

[0057] Ground feature echo simulation component, which generates simulated ground feature echoes based on the distribution orientation, distance, depth, and mountain height conditions of ground features as determined by the guidance and tuning, and uses FPGA unit to filter ground feature clutter;

[0058] Sea clutter simulation component, which generates simulated sea clutter with different distribution patterns under the sea conditions of a given area;

[0059] A weather clutter generation component generates radar weather clutter that conforms to weather characteristics based on the weather distribution area, weather level, and movement speed conditions as specified in the guidance scenario.

[0060] A chaff interference generation component generates radar meteorological clutter that conforms to the characteristics of chaff interference based on the chaff distribution area and meteorological conditions such as weather level and wind speed as determined by the guidance and control.

[0061] An active interference simulation component receives instructions from the main control computer regarding the azimuth, intensity, and type of electronic equipment interference based on predetermined conditions. The MCU obtains the radar radio frequency through frequency detection, calls the interference instructions from the interference information database, and simultaneously retrieves the corresponding local oscillator frequency. The two are mixed in a mixer to form a radio frequency interference signal, which is amplified by a power amplifier and then radiated directionally through an antenna to obtain active electronic interference for the radar.

[0062] like Figure 1 As shown, this invention consists of two parts: first, generating simulated radar site geographical environment data based on GIS data to provide a basis for radar site selection; second, generating various information on complex electromagnetic environments such as terrain features, weather, chaff, and electronic interference through multi-module electronic equipment, especially electronic deception interference, to create conditions for testing radar, tactical, and technical performance and conducting tactical training exercises. The site environment simulation system is composed as follows: Figure 1 As shown.

[0063] GIS provides information including topography, landmark elevation, latitude and longitude, etc.

[0064] Coordinate transformation refers to generating a polar coordinate system with the radar site as the origin, based on needs or instructions. Inputting the corresponding parameters is the basic condition for generating polar coordinates.

[0065] Masking angle processing and clutter RCS calculation are the radar elevation angles corresponding to ground features above the radar origin in polar coordinates, such as... Figure 2 As shown. The calculation method is as follows:

[0066]

[0067] Where: α: elevation angle of ground feature (shading angle)

[0068] H 地物海拔 Elevation of land features

[0069] H 雷达 Radar elevation

[0070] H 地曲 Earth's curvature height from radar station to ground features

[0071] Relative distance between ground features and radar station

[0072] Among them, the elevation of the radar station and the elevation of the ground features are provided by GIS, and the relative distance between the ground features and the radar station is the result of the two-point location estimation provided by GIS.

[0073] The effect of the shielding angle on radar detection, such as Figure 3 As shown. Based on the radar station's target detection mission requirements, the allowable obstruction angle of the ground features at the site can be calculated, thereby determining whether to select that point as a candidate site for the radar station.

[0074] The simulated radar site and radar training system refers to adding various jamming elements and false target signals to an existing radar site to verify the radar's signal processing capabilities and also to provide conditions for the technical training of radar operators. This invention can serve as a platform for centralized training, command, and improved guidance and control capabilities of multiple radars.

[0075] The principle block diagram of the radar site environment simulation component is as follows: Figure 4 As shown.

[0076] The main control computer, as the device for generating and controlling the scenario of the director, sends various simulation information to the target radar of the exercise, sets the flight parameters of the false target, simulates various signals required by the target and interference generation module, and after being synthesized by the integrated equipment, it is temporarily stored in the information buffer component for the radar terminal to call.

[0077] This invention is a non-contact wireless radar signal simulation device. The various radar simulation signals provided are all input analog modulation signals of a radar simulator, which are ultimately radiated into space by the radar simulator's radio frequency radiation signal and received by the radar.

[0078] 1. Target Echo Simulation Component: Based on the pre-defined scenarios, the main control computer generates various parameters of the simulated aerial target, such as target azimuth, distance, altitude, speed, and time, forming four-dimensional target information including time. Target simulation is a comprehensive information system. Because modern radar signal processing systems have strong echo recognition capabilities, even slight differences in pulse modulation methods or other aspects of the simulated target echo can be detected by the radar and prevent it from reaching the acquisition terminal. This invention is a radar non-contact wireless signal simulation combination that utilizes DRFM technology and a response-based target parameter deception method to generate radar target echo signals using a radar radio frequency pulse delay restoration mode. The block diagram of its composition is shown below. Figure 5 As shown.

[0079] Unlike traditional DRFM deception target generators, this method utilizes the variation in the high elevation angle pulse frequency of a three-coordinate phased array radar to output simulated target signals at high pulse repetition rates, creating the illusion that the simulated target has altitude information, making the simulated echo more realistic.

[0080] The table below shows the variation of the elevation angle scanning repetition frequency of a phased array three-coordinate radar.

[0081]

[0082] As can be seen from the table, the pulse width and repetition frequency at high elevation angles have changed, making them easily detectable. The radar repetition frequency changes significantly. This invention utilizes the detected high repetition frequency wave position to send a response echo signal, allowing the radar to detect targets with altitude information. Combined with the azimuth and distance information generated by the time delay of the echo, the complete coordinate elements of the target are constituted.

[0083] The ground feature echo simulation component, upon inputting given conditions such as the location, distance, depth, and peak height of ground features, can then simulate ground feature echoes according to... Figure 1 The principle block diagram generates simulated ground object echoes. Utilizing the powerful compilation capabilities of FPGA, it can vividly and intuitively simulate ground object scenarios online. It features a radar signal processing unit that can effectively filter ground object clutter by reflecting ground object echoes. Ground object echo simulation generally follows Rayleigh, log-normal, or Weibull distributions to form ground clutter, and most radars have the capability to process signals from multiple distributions.

[0084] Sea clutter simulation component. Its basic components are similar to those used in ground feature echo generation. For example... Figure 6 As shown.

[0085] Meteorological clutter generation component. The simulated composition of meteorological clutter generation is similar to that of sea clutter, except that meteorological clutter incorporates a Doppler component representing wind speed movement. Meteorological clutter is generally generated according to Rayleigh or K-distribution rules, and most modern radars have corresponding meteorological clutter processing capabilities. The components are as follows: Figure 7 As shown.

[0086] Chaff jamming generation component. Similar to weather jamming generation, its movement is related to wind speed, and its intensity is much greater than weather jamming, reflecting target echoes no less than those of large aircraft.

[0087] All of the above signals are radiated into the air by the radio frequency components of the radar simulator at the same frequency and with the same modulation signal characteristics as the radar, for radar to receive and process.

[0088] Active jamming simulation component. Similar to the simulated target echo generator, it is an active electronic jamming device deployed at a specific location in addition to deceiving the target echo. Its components are as follows: Figure 8 As shown, the main control computer issues commands regarding the location, intensity, and type of electronic equipment interference. In the active interference output component, the MCU detects the radar's radio frequency (RF frequency) and sends an interference request to the interference information database. Simultaneously, it retrieves the corresponding local oscillator frequency. These two frequencies are mixed in a mixer to form an RF interference signal. After amplification by a power amplifier, the signal is directionally radiated through the antenna, causing active electronic interference to the radar. The interference intensity is controllable.

[0089] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and adjustments without departing from the principle of the present invention, and these improvements and adjustments should also be considered within the scope of protection of the present invention.

Claims

1. A GIS-based radar site simulation system, characterized in that, The simulation system includes: A coordinate transformation unit, which generates a polar coordinate system with the radar site as the origin based on GIS data; The masking angle clutter RCS calculation unit calculates the radar elevation angle, i.e., the masking angle, of ground objects that are higher than the radar origin in the polar coordinate system according to the radar elevation parameters. The ground clutter intensity calculation unit generates ground clutter signal levels based on the area, light intensity, and depth width information of ground clutter distribution characteristics from GIS data. The random sequence unit automatically generates a simulated ground clutter random sequence that conforms to the characteristics of GIS ground features based on the ground feature distribution area, ground feature height, and reflection intensity determined during radar training and drills, and converts the random sequence into an orthogonal digital signal using I / Q conversion. An amplitude modulation unit performs level amplitude conversion on the final ground clutter radar signal and the quadrature digital signal sent from the previous stage. The ground clutter generation unit combines the azimuth and shielding angle data formed by the radar tower height and ground objects to calculate the ground clutter signal voltage that conforms to the characteristics of ground clutter distribution.

2. The GIS-based radar site simulation system according to claim 1, characterized in that, The shading angle is calculated using the following expression: Where: α is the shading angle; H 地物海拔 H represents the elevation of a ground feature; 雷达 H represents the radar elevation. 地曲 R is the height of the Earth's curvature from the radar station to the ground feature; R is the relative distance between the ground feature and the radar station. Among them, the radar altitude and the altitude of the ground features are both provided by GIS, and the relative distance between the ground features and the radar station is the result of the two-point location estimation provided by GIS.

3. The GIS-based radar site simulation system according to claim 1, characterized in that, During radar training exercises, the random sequence unit automatically generates a simulated ground clutter random sequence that conforms to the characteristics of GIS ground features, based on the distribution area, height, and reflection intensity of ground features as determined by the training scenario. Specifically, this sequence includes: The target echo simulation component generates various parameters of simulated aerial targets according to the guidance scenario and instructions from the main control computer. It uses DRFM technology and adopts a response-type target parameter deception method to generate simulated radar target echo signals in radar radio frequency pulse delay restoration mode. The ground feature echo simulation component generates simulated ground feature echoes based on the ground feature distribution azimuth, distance, depth, and mountain peak height conditions as determined by the guidance scenario. It uses FPGA units to filter ground feature clutter. Sea clutter simulation component, which generates simulated sea clutter with different distribution patterns under the sea conditions of a given area; A weather clutter generation component generates radar weather clutter that conforms to weather characteristics based on the weather distribution area, weather level, and movement speed conditions as specified in the guidance scenario. A chaff interference generation component generates radar meteorological clutter that conforms to the characteristics of chaff interference based on the chaff distribution area and meteorological conditions such as weather level and wind speed as determined by the guidance and control. An active interference simulation component receives instructions from the main control computer regarding the azimuth, intensity, and type of electronic equipment interference based on predetermined conditions. The MCU obtains the radar radio frequency through frequency detection, calls the interference instructions from the interference information database, and simultaneously retrieves the corresponding local oscillator frequency. The two are mixed in a mixer to form a radio frequency interference signal, which is amplified by a power amplifier and then radiated directionally through an antenna to obtain active electronic interference for the radar.

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