CN111624564A - Radar pitch angle target simulation system and method - Google Patents
Radar pitch angle target simulation system and method Download PDFInfo
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- CN111624564A CN111624564A CN202010464866.3A CN202010464866A CN111624564A CN 111624564 A CN111624564 A CN 111624564A CN 202010464866 A CN202010464866 A CN 202010464866A CN 111624564 A CN111624564 A CN 111624564A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
- G01S7/4082—Means for monitoring or calibrating by simulation of echoes using externally generated reference signals, e.g. via remote reflector or transponder
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a radar pitch angle target simulation system and method. The system comprises: an angle simulator and a target simulator; the angle simulation equipment comprises a receiving unit, a transmitting unit and a supporting unit, wherein the receiving unit and the transmitting unit are arranged on the supporting unit; the receiving unit comprises a receiving antenna and an amplifier, the transmitting unit comprises a transmitting antenna, and the transmitting antenna is arranged at different positions in the vertical direction of the supporting unit; the target simulator is for: the radar radiation signal of the radar to be detected is received through the receiving unit, the radar echo signal is generated according to the received radar radiation signal and the target motion parameter, and the radar echo signal is controlled to be output from the transmitting antenna corresponding to the target pitching angle after being amplified by the amplifier. Because the cost of the angle simulation equipment and the target simulator is low, the construction time is short, and the angle simulation equipment and the target simulator are convenient and quick. Therefore, the method and the device reduce the cost and period for verifying the target pitch angle detection capability of the radar, and improve the convenience of verification.
Description
Technical Field
The invention relates to the technical field of radar testing, in particular to a radar pitch angle target simulation system and method.
Background
The radar as a target detection device is not influenced by blocking of fog, cloud and rain, and has the characteristics of all weather and all day long. Therefore, radar is widely applied in the field of target detection and scientific research, and research, development and application of radar technology are more and more emphasized in various countries. In the radar research and development stage, in order to ensure various performances of the radar in practical application, the radar needs to be tested and verified, such as the detection capability of the radar, such as distance, speed, pitching angle and the like. In particular, in view of practical application requirements, increasingly higher requirements have been made in recent years on the target pitch angle detection capability of the radar. Accordingly, how to simulate the pitch angle of the target to verify the target pitch angle detection capability of the radar is also a research hotspot in the field of radar testing.
Currently, there are two main ways to verify the target pitch angle detection capability of the radar in the prior art. One way is to construct a microwave dark room with a length and width of several tens of meters, and place a spherical array with a horn antenna in the microwave dark room. During testing, the radar is placed at a certain distance away from the spherical array, and radar echo signals generated by targets located at different pitching angles of the radar are simulated by utilizing different horn antenna radiation signals in the vertical direction. The other method is to build a high tower, place horn antennas at different positions in the vertical direction of the high tower, place the radar at a certain distance from the high tower during testing, and utilize the radiation signals of the horn antennas at different positions to simulate the radar echo signals generated by targets at different pitching angles of the radar.
In the prior art, the target pitch angle detection capability of the radar is verified, but the construction of a microwave darkroom and a high tower is not easy, the cost is high, and the construction period is long; and the microwave darkroom is complex to operate, and the high tower needs to be climbed by related personnel, so that the use is very inconvenient.
Disclosure of Invention
In view of this, the embodiment of the invention discloses a radar pitch angle target simulation system and method, so as to reduce the cost and period for verifying the target pitch angle detection capability of a radar and improve the convenience of verification.
The embodiment of the invention discloses a radar pitch angle target simulation system, which comprises: an angle simulator and a target simulator; the angle simulation equipment comprises a receiving unit, a transmitting unit and a supporting unit, wherein the receiving unit and the transmitting unit are arranged on the supporting unit; the receiving unit comprises a receiving antenna, the transmitting unit comprises a transmitting antenna and an amplifier, and the transmitting antenna is arranged at different positions in the vertical direction of the supporting unit; the target simulator is configured to: receiving a radar radiation signal of a radar to be detected through the receiving unit, generating a radar echo signal according to the received radar radiation signal and a target motion parameter, and controlling the radar echo signal to be amplified by an amplifier and then output from a transmitting antenna corresponding to a target pitching angle; wherein the target motion parameters include: target distance and/or target speed of the simulated target; and the target pitch angle represents the pitch angle of the simulated target relative to the radar to be detected.
Optionally, in a specific implementation manner of the embodiment of the present invention, the receiving antenna is disposed at different positions on the supporting unit, where the specific setting positions are adapted to a beam irradiation width of the radar to be detected and a variation range of the target pitch angle; the receiving unit further comprises a power combiner; the power combiner is connected with the receiving antenna and used for synthesizing the radar radiation signals received by the receiving antenna and then sending the radar radiation signals to the target simulator.
Optionally, in a specific implementation manner of the embodiment of the present invention, the transmitting unit further includes: a switch and power supply control module; controlling the radar echo signal to be output from a transmitting antenna corresponding to the target elevation angle after being amplified by an amplifier, and the method comprises the following steps: and sending a pitching angle control instruction to the switch and power supply control module so that the switch and power supply control module determines an amplifier needing power supply according to the pitching angle control instruction and switches the switch to a transmitting antenna corresponding to the target pitching angle.
Optionally, in a specific implementation manner of the embodiment of the present invention, the supporting unit includes a lifting rod, and the receiving unit and the transmitting unit are fixed on the lifting rod.
Optionally, in a specific implementation manner of the embodiment of the present invention, the target simulator includes: and the data transmission unit is used for remotely receiving a control instruction of the target simulator.
Optionally, in a specific implementation manner of the embodiment of the present invention, the transmitting unit includes a plurality of switching amplifying modules, and each of the switching amplifying modules includes a switch and an amplifier; the switch amplification modules are connected in a multi-division cascade mode, and the switch amplification module at the last stage is connected with the transmitting antenna.
Optionally, in a specific implementation manner of the embodiment of the present invention, the transmitting unit includes at least one section, each section includes a first preset number of switching amplification modules, and each switching amplification module includes a switch and an amplifier; the switch amplification modules are cascaded together, and each switch amplification module is connected with one transmitting antenna.
Optionally, in a specific implementation manner of the embodiment of the present invention, the transmitting unit includes at least one section, each section includes a second preset number of switches and an amplifier, each amplifier is located at a front end of each section, the amplifier is cascaded with the switches, and each switch is connected to one of the transmitting antennas through an attenuator.
Optionally, in a specific implementation manner of the embodiment of the present invention, the transmitting antennas are further disposed at different positions in a horizontal direction of the supporting unit; controlling the radar echo signal to be output from a transmitting antenna corresponding to the target elevation angle after being amplified by an amplifier, and the method comprises the following steps: and controlling the radar echo signals to be output from the transmitting antennas corresponding to the target pitch angle and the target azimuth angle after being amplified by the amplifier.
The embodiment of the invention also discloses a radar pitch angle target simulation method, which is applied to the radar pitch angle target simulation system in any one of the embodiments, and the method comprises the following steps:
placing the radar to be detected at a preset position so that the radar to be detected is located in an XY plane of a coordinate system established in the radar pitch angle target simulation system, wherein the radar pitch angle target simulation system is a preset distance away from the radar to be detected, and the preset distance is adaptive to the change range of the target pitch angle and the setting position of the transmitting antenna;
the target simulator receives the radar radiation signal transmitted by the radar to be detected through the receiving unit;
the target simulator generates a radar echo signal according to the received radar radiation signal and the target motion parameter;
and the target simulator controls the radar echo signal to be amplified by an amplifier and then output from a transmitting antenna corresponding to the target pitching angle.
Optionally, in a specific implementation manner of the embodiment of the present invention, the method further includes:
and the target simulator determines the target motion parameters of the simulated target and the pitching angle of the simulated target relative to the radar to be detected in real time according to the track control instruction corresponding to the simulated target.
From the technical scheme, the embodiment of the invention discloses a radar pitch angle target simulation system and a radar pitch angle target simulation method. The radar pitch angle target simulation system disclosed by the embodiment of the invention comprises: an angle simulator and a target simulator; the angle simulation equipment comprises a receiving unit, a transmitting unit and a supporting unit, wherein the receiving unit and the transmitting unit are arranged on the supporting unit; the receiving unit comprises a receiving antenna and an amplifier, the transmitting unit comprises a transmitting antenna, and the transmitting antenna is arranged at different positions in the vertical direction of the supporting unit; the target simulator is for: receiving a radar radiation signal of a radar to be detected through a receiving unit, generating a radar echo signal according to the received radar radiation signal and a target motion parameter, and controlling the radar echo signal to be output from a transmitting antenna corresponding to a target pitching angle after being amplified by an amplifier; wherein the target motion parameters include: target distance and/or target speed of the simulated target; and the target pitch angle represents the pitch angle of the simulated target relative to the radar to be measured. According to the radar pitch angle target simulation system and method disclosed by the embodiment of the invention, the transmitting antennas are arranged at different positions in the vertical direction of the supporting unit, the target simulator can receive radar radiation signals of a radar to be tested through the receiving unit, radar echo signals are generated according to the received radar radiation signals and target motion parameters, the radar echo signals are controlled to be output from the transmitting antennas corresponding to the target pitch angles after being amplified by the amplifier, and the target pitch angle detection capability of the radar is verified. In the process, the cost of the angle simulation equipment and the target simulator is far lower than that of a high tower and a microwave darkroom, and the construction work of the angle simulation equipment and the target simulator is short. In addition, after the radar pitch angle target simulation system is built, the target motion parameters are set by related personnel in the whole process, and the radar pitch angle target simulation system is convenient and quick. Therefore, compared with the prior art, the cost and the period for verifying the target pitch angle detection capability of the radar are reduced, and the convenience of verification is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the disclosed drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a radar pitch angle target simulation system according to an embodiment of the present invention;
FIG. 2 is a schematic view of a usage scenario of a radar pitch angle target simulation system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a principle of calculating a simulation accuracy of a pitch angle according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a radio frequency link for transmitting a radar echo signal according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another radio frequency link for transmitting a radar echo signal according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another radio frequency link for transmitting a radar echo signal according to an embodiment of the present invention;
fig. 7 is a schematic flowchart of a radar pitch angle target simulation method according to an embodiment of the present invention;
fig. 8 is a scene schematic diagram of a motion trajectory of a simulated moving object according to an embodiment of the present invention.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a radar pitch angle target simulation system and a radar pitch angle target simulation method, which are used for reducing the cost and the period for verifying the target pitch angle detection capability of a radar and improving the convenience of verification.
Referring to fig. 1, a schematic structural diagram of a radar pitch angle target simulation system disclosed in the embodiment of the present invention is shown. As shown in fig. 1, a radar pitch angle target simulation system disclosed in the embodiment of the present invention includes:
an angle simulation device 11 and a target simulator 12. The angle simulation apparatus 11 includes a receiving unit, a transmitting unit, and a supporting unit, and the receiving unit and the transmitting unit are disposed on the supporting unit 13. The receiving unit includes therein a receiving antenna 14, the transmitting unit includes therein a transmitting antenna 15 and an amplifier (not shown in fig. 1), and the transmitting antenna 15 is disposed at different positions in the vertical direction of the supporting unit 13. The target simulator 12 is configured to: the radar radiation signal of the radar to be detected is received through the receiving unit, the radar echo signal is generated according to the received radar radiation signal and the target motion parameter, and the radar echo signal is controlled to be amplified by the amplifier and then output from the transmitting antenna 15 corresponding to the target pitching angle. Wherein the target motion parameters include: target distance and/or target speed of the simulated target; and the target pitch angle represents the pitch angle of the simulated target relative to the radar to be measured. The technology for generating radar echo signals according to radar radiation signals and target motion parameters is the prior art, and specifically, the radar radiation signals enter a down-conversion unit and are converted into intermediate frequency through two-stage down-conversion, and low-intermediate frequency radar radiation signals are provided for a baseband unit to be subjected to data processing. The data processing process comprises the following steps: collecting low and intermediate frequency radar radiation signals, carrying out DDC (Digital Down converters) operation, frequency measurement, detection, distance, Doppler frequency and amplitude modulation, DUC (Digital Up converter) operation and the like in a Digital mode, finally carrying out Digital-to-analog conversion and outputting low and intermediate frequency target signals, enabling the low and intermediate frequency target signals after baseband processing to enter an up-conversion unit, and carrying out two-stage up-conversion to radio frequency to obtain radar echo signals.
It is apparent that: the different positions of the transmitting antenna 15 in the vertical direction of the supporting unit 13 are set for realizing the simulation of targets with different pitch angles, the amplifier is set for amplifying the output radar echo signal, and the transmitting antenna 15 corresponding to the target pitch angle is one transmitting antenna in the transmitting unit. In this way, the radar echo signal is output from the transmitting antenna 15 corresponding to the target pitch angle, so that the simulation of the target located at the depression angle of the radar to be detected is realized, and the target pitch angle detection capability of the radar to be detected is verified. In addition, in practical application, different target motion parameters can be set according to different simulation purposes. If the simulation is aimed at simulating a stationary target located at a specific distance and at a specific pitch angle of the radar to be measured, the target simulation parameters include the target distance. As another example, if the simulation objective is to simulate a moving target at a particular pitch angle at the location of the radar pitch angle target simulation system, the target simulation parameters include target velocity. If the simulation is aimed at simulating a moving target at a specific distance and a specific pitch angle of the radar to be measured, the target simulation parameters include target distance and target velocity. Certainly, in practical applications, the radar pitch angle target simulation system according to the embodiment of the present invention may also simulate a target moving in real time, for example, may be used to simulate a target moving in a parabolic manner, where the target distance and the target speed are changed in real time, and the target pitch angle is also changed in real time.
The following are specifically mentioned: the simulation purpose can also be to simulate a plurality of targets positioned at different distances and different pitching angles of the radar to be detected, generate radar echo signals corresponding to the targets according to radar radiation signals and motion parameters of the targets, and transmit the radar echo signals to the radar to be detected through corresponding transmitting antennas.
For convenience of understanding, a practical use scenario of the radar pitch angle target simulation system is described here as an example, and is shown in fig. 2:
assuming that a radar pitch angle target simulation system simulates a real-time moving target, a radar 21 to be tested transmits a radar radiation signal to the radar pitch angle target simulation system, the radar pitch angle target simulation system receives the radar radiation signal through a receiving antenna 14, a target simulator 12 completes real-time simulation of a target distance and a target speed according to a movement track of the target to be simulated, and then a real-time radar echo signal is generated according to the radar radiation signal received by the receiving antenna 14 and the real-time simulated target distance and target speed. Meanwhile, the target simulator 12 determines a target pitch angle of the target to be simulated according to the motion track of the target to be simulated, and controls the radar echo signal to be output from the transmitting antenna 15 corresponding to the target pitch angle, namely controls which transmitting antenna 15 the radar echo signal is output by, and completes the pitch angle target simulation function. In the process, the target simulator 12 controls the angle simulation device 11 in real time according to the movement track of the designed target to be simulated, and controls the position of the transmitting antenna 15 in real time to simulate the movement of the target in the pitch angle direction so as to simulate the real-time pitch angle of the target. The setting of the motion track of the target to be simulated is determined according to the type, the motion mode and the like of the target, and a real target motion track can also be imported.
When the radar pitch angle target simulation system provided by the embodiment of the invention is used for simulating a target, the target simulator and the angle simulation equipment are connected together, namely the building of hardware is realized, compared with the building of a high tower and a microwave darkroom with huge volume and engineering, the unnecessary hardware waste is reduced, the cost is greatly reduced, and the building period is short. Typically, the system set-up is completed in a few tens of minutes. And when the target is simulated in the later stage, corresponding target simulation parameters are set, so that the method is simple and convenient.
In addition, compared with a microwave darkroom mode, the radar pitch angle target simulation system provided by the embodiment of the invention is designed aiming at an external application scene, so that the over-ideal experimental environment of the microwave darkroom is avoided, and a more real experimental environment can be obtained in an external field. Such as weather effects, ground clutter effects, and the like.
In addition, when the target pitch angle detection capability of the radar is verified, the target pitch angle detection capability is limited by hardware resources and cost, and generally only horn antennas are arranged at a plurality of fixed positions, so that a radar pitch angle target with a fine angle cannot be simulated. In the embodiment of the invention, the final angle simulation equipment is controlled by the target simulator, and the radio frequency link part for transmitting the radar echo signal can be realized only by a certain number of devices such as transmitting antennas, amplifiers and the like, so that the cost is low, more and more dense transmitting antennas can be arranged, the arrangement of the transmitting antennas is higher than the resolution of the radar to be tested, and the simulation of continuous pitching angles can be realized. Therefore, in a specific implementation manner of the embodiment of the present invention, the arrangement of the transmitting antennas is determined according to the resolution of the radar to be detected, and the arrangement interval of the transmitting antennas is less than or equal to the interval corresponding to the resolution of the radar to be detected, that is, the interval distance corresponding to the pitch angle corresponding to the resolution of the radar to be detected is greater than or equal to the arrangement interval of the transmitting antennas.
For convenience of understanding, a specific example of calculating the relationship between the arrangement interval of the transmitting antennas in the vertical direction and the simulation accuracy of the pitch angle is taken here. Fig. 3 is a schematic diagram illustrating a principle of calculating a simulation accuracy of a pitch angle according to an embodiment of the present invention. For convenience of calculation, it is assumed in fig. 3 that one of the transmitting antennas is located at a perpendicular point of a perpendicular line made by the radar 31 to be measured to the angle simulation plane 32 where each transmitting antenna is located in the radar pitch angle target simulation system. In fig. 3, l represents a vertical distance between the radar 31 to be measured and the angle simulation plane 32, and represents an arrangement interval between two adjacent transmitting antennas in the vertical direction, and α represents a pitch angle simulation accuracy, that is, a maximum deviation between a theoretical position and an actual position, and it can be known from fig. 3 that the three satisfy a relation tan (α) ═ l. Therefore, the transmitting antenna can be arranged at intervals in the vertical direction according to the pitching angle corresponding to the resolution of the radar to be detected, and the pitching angle simulation precision can also be calculated according to the arrangement intervals of the transmitting antenna in the vertical direction. Of course, it is understood that distance simulation accuracy and velocity simulation accuracy also need to be considered when simulating a moving object. The invention primarily considers pitch angle simulation accuracy.
The embodiment of the invention discloses a radar pitch angle target simulation system, which comprises: an angle simulator and a target simulator; the angle simulation equipment comprises a receiving unit, a transmitting unit and a supporting unit, wherein the receiving unit and the transmitting unit are arranged on the supporting unit; the receiving unit comprises a receiving antenna and an amplifier, the transmitting unit comprises a transmitting antenna, and the transmitting antenna is arranged at different positions in the vertical direction of the supporting unit; the target simulator is for: receiving a radar radiation signal of a radar to be detected through a receiving unit, generating a radar echo signal according to the received radar radiation signal and a target motion parameter, and controlling the radar echo signal to be output from a transmitting antenna corresponding to a target pitching angle after being amplified by an amplifier; wherein the target motion parameters include: target distance and/or target speed of the simulated target; and the target pitch angle represents the pitch angle of the simulated target relative to the radar to be measured. According to the radar pitch angle target simulation system disclosed by the embodiment of the invention, the transmitting antennas are arranged at different positions in the vertical direction of the supporting unit, the target simulator can receive radar radiation signals of a radar to be tested through the receiving unit, radar echo signals are generated according to the received radar radiation signals and target motion parameters, the radar echo signals are controlled to be output from the transmitting antennas corresponding to the target pitch angle after being amplified by the amplifier, and the target pitch angle detection capability of the radar is verified. In the process, the cost of the angle simulation equipment and the target simulator is far lower than that of a high tower and a microwave darkroom, and the construction work of the angle simulation equipment and the target simulator is short. In addition, after the radar pitch angle target simulation system is built, the target motion parameters are set by related personnel in the whole process, and the radar pitch angle target simulation system is convenient and quick. Therefore, compared with the prior art, the cost and the period for verifying the target pitch angle detection capability of the radar are reduced, and the convenience of verification is improved.
In order to prevent a plurality of targets to be simulated from being positioned at different angles in actual use or prevent a moving target to be simulated from being positioned at different angles at each moment, one receiving antenna is adopted to not receive radar radiation signals sent by a radar to be tested. Optionally, in a specific implementation manner of the embodiment of the present invention, the receiving antenna 14 is disposed at different positions on the supporting unit 13, where the specific positions are adapted to the beam irradiation width of the radar to be measured and the variation range of the target pitch angle. At this point, with continued reference to fig. 1, the receiving unit may further include a power combiner 16; the power combiner 16 is connected to the receiving antenna 14, and is configured to combine the radar radiation signals received by the receiving antenna 14 and send the combined radar radiation signals to the target simulator 12. For example, if the beam irradiation width of the radar to be measured is 1 degree, and the target pitch angle variation range of the simulation target (a plurality of targets or a moving target moving to different positions) is 10 degrees, 10 or more receiving antennas need to be arranged. Of course, in other embodiments, the power combiner may be integrated into the target simulator 12.
With continuing reference to fig. 1, optionally, in a specific implementation of the embodiment of the present invention, the transmitting unit further includes: a switch and power supply control module 17; controlling radar echo signals to be output from a transmitting antenna corresponding to a target pitch angle after being amplified by an amplifier, and the method comprises the following steps: and sending a pitching angle control instruction to the switch and power supply control module 17, so that the switch and power supply control module 17 determines an amplifier to be supplied with power according to the pitching angle control instruction, and switches the switch to a transmitting antenna corresponding to the target pitching angle. In the specific embodiment, the amplifier which needs to be powered is determined through the pitching angle control instruction, so that power is only supplied to the amplifier related to the transmitting antenna corresponding to the target pitching angle, and power consumption can be saved. Particularly, when a moving target is simulated, a target pitch angle is determined in real time according to a target moving track, the power supply control module 17 continuously selects an amplifier needing power supply and a switch needing switching according to a pitch angle control instruction to realize track control, only a part of amplifiers are powered at the moment, and a part of power consumption can be saved. In a specific implementation, a switch array mode can be adopted to select the transmitting antenna corresponding to the target pitching angle.
In order to conveniently build angle simulation equipment in the radar pitch angle target simulation system, the supporting unit can be set to be in a rapid retractable mode. For example, optionally, in a specific implementation of the embodiment of the present invention, the supporting unit 13 includes a lifting rod, and the receiving unit and the transmitting unit are fixed on the lifting rod.
In order to avoid harm to human body under the condition of radar radiation, a remote control mode can be used. Optionally, in a specific implementation manner of the embodiment of the present invention, the target simulator 12 may include: and the data transmission unit 18, wherein the data transmission unit 18 is used for remotely receiving the control instruction of the target simulator. The control command may be a specific target motion parameter or a target motion trajectory, and the target simulator calculates the target motion parameter in real time according to the target motion trajectory. In practical use, the data transmission unit with moderate weight, convenient use, small data transmission delay, moderate transmission distance and flexible protocol can be selected. Of course, it is understood that both remote control and local control may be supported in practical use for convenience.
In practical use, the design of the radio frequency link part from the target simulator to the transmitting antenna air feed output will affect the indexes such as power consumption of the radar pitch angle target simulation system, and therefore, the design of the radio frequency link part for transmitting radar echo signals is also very important. The radio frequency link for transmitting radar return signals according to the embodiment of the present invention is described below with reference to fig. 4, 5, and 6.
Fig. 4 is a schematic structural diagram of a radio frequency link for transmitting a radar echo signal according to an embodiment of the present invention. The transmitting unit comprises a plurality of switch amplifying modules, each switch amplifying module comprises a switch and an amplifier (the switch amplifying module comprising the switch and the amplifier is represented by 'switch amplifying' in fig. 4); the switching amplification modules are connected in a binary cascade mode, the switching amplification module at the last stage is connected with a transmitting antenna, the transmitting antenna is an antenna 0 and an antenna 1 in fig. 4, and the antenna 0 and the antenna 1 represent different transmitting antennas. Of course, it is understood that, in actual use, besides the binary cascade manner shown in fig. 4, other multi-stage cascade manners such as one-to-four, one-to-eight, etc. may be adopted in the multi-stage amplification, and the specific multi-stage amplification to be used is determined according to actual application requirements. The design of sampling a plurality of multi-branch cascades has the advantages of simple control and low requirements on the amplifier and the switch. Specifically, due to the adoption of multi-stage amplification, the corresponding power is low during switching, and the switching speed is high. In another angle, compared with the one-stage amplification, the loss on the multi-stage amplification cable is small, and the power consumption is small.
Optionally, in a specific implementation manner of the embodiment of the present invention, the transmitting unit may include at least one section, each section includes a first preset number of switching amplification modules, and each switching amplification module includes a switch and an amplifier; the switch amplification modules are cascaded together, and each switch amplification module is connected with one transmitting antenna. Fig. 5 is a schematic structural diagram of a radio frequency link for transmitting a radar echo signal according to an embodiment of the present invention. Fig. 5 shows a transmitting unit with only one section or shows one section of a plurality of sections in the transmitting unit, and the sections are cascaded together. In order to facilitate the disassembly and replacement, the sections can be detachably arranged. Each section in fig. 5 comprises 8 switching amplification modules (in fig. 5, "switching/amplifying" denotes a switching amplification module comprising a switch and an amplifier), and accordingly, each section corresponds to 8 transmitting antennas, namely, antenna 0, antenna 1, antenna 2, antenna 3, antenna 4, antenna 5, antenna 6 and antenna 7. Of course, in other embodiments, the number of switching amplification modules and transmitting antennas included in each section may be other numbers, such as 6, 10, etc. The specific implementation mode is simple to install, light in weight and low in power consumption. In practical application, only relevant parts of the transmitting antenna which are actually required to transmit the radar echo signals can be powered, so that power consumption is saved. In addition, a larger power signal can be provided at the initial input end, so that the amplification factor is smaller when each transmitting antenna needs to transmit a radar echo signal; it is also possible to provide a smaller power signal at the initial input and a relatively larger amplification when each transmitting antenna is required to transmit a radar return signal.
Optionally, in a specific implementation manner of the embodiment of the present invention, the transmitting unit includes at least one section, each section includes a second preset number of switches and an amplifier, each amplifier is located at a front end of each section, the amplifier is cascaded with the switches, and each switch is connected to one transmitting antenna through one attenuator. Fig. 6 is a schematic structural diagram of a radio frequency link for transmitting a radar echo signal according to an embodiment of the present invention. Fig. 6 shows a transmitting unit with only one section or shows one section of a plurality of sections in the transmitting unit, and the sections are cascaded together. In order to facilitate the disassembly and replacement, the sections can be detachably arranged. Each section in fig. 6 includes 8 switches, and accordingly, each section corresponds to 8 transmit antennas, antenna 0, antenna 1, antenna 2, antenna 3, antenna 4, antenna 5, antenna 6, and antenna 7. Of course, in other embodiments, the number of switches and transmit antennas included in each section may be other numbers, such as 6, 10, etc. The specific implementation mode is simple to install, light in weight and low in power consumption. In practical application, only relevant parts of the transmitting antenna which are actually required to transmit the radar echo signals can be powered, so that power consumption is saved. The method reduces the number of the amplifiers compared with other schemes, and does not generate power loss because the attenuators are passive devices, thereby saving the power consumption as a whole.
In actual use, the target is related to azimuth angle in addition to pitch angle. In order to make the target simulation more realistic, optionally, in a specific implementation manner of the embodiment of the present invention, the transmitting antennas are further disposed at different positions in the horizontal direction of the supporting unit; correspondingly, the control radar echo signal is output from the transmitting antenna corresponding to the target pitch angle after being amplified by the amplifier, and the control radar echo signal comprises the following steps: and controlling the radar echo signals to be output from the transmitting antennas corresponding to the target pitch angle and the target azimuth angle after being amplified by the amplifier. Thereby simulating the three-dimensional motion of the target in space. It is obvious that if a moving object is simulated, the pitch angle and the azimuth angle of the object are changed in real time, and the corresponding transmitting antenna is also changed in real time.
As shown in fig. 7, corresponding to the above system embodiment, the embodiment of the present invention further discloses a radar pitch angle target simulation method, which is applied to the radar pitch angle target simulation system in the foregoing embodiment, and includes:
in step S710, the radar to be measured is placed at a preset position, so that the radar to be measured is located in the XY plane of the coordinate system established in the radar pitch angle target simulation system, and the radar pitch angle target simulation system is a preset distance from the radar to be measured, where the preset distance is adapted to the variation range of the target pitch angle and the setting position of the transmitting antenna.
In practical application, the azimuth center line of the radar pitch angle target simulation system is usually located on the azimuth center plane of the antenna beam of the radar to be measured. The azimuth center line of the radar pitch angle target simulation system refers to: and simulating a vertical line where the transmitting antenna is located in the equipment. Of course, when the transmitting antenna in the angle simulation device is also arranged in different directions, the azimuth center line of the radar pitch angle target simulation system refers to: and the direction of the transmitting antenna in the angle simulation equipment is towards the central line. The antenna beam azimuth center plane of the radar to be measured is as follows: and (3) a vertical plane which bisects the antenna wave beam of the radar to be measured. The coordinate system established in the radar pitch angle target simulation system is established in the following way: the plane of the ground is taken as an XOY plane of a coordinate system, the vertical direction is taken as the Z direction of the coordinate system, and the X, Y and the Z direction of the coordinate system accord with the right-hand rule. The preset distance setting standard is as follows: the preset distance is adaptive to the change range of the target pitch angle and the setting position of the transmitting antenna, namely when the radar pitch angle target simulation system is away from the preset distance of the radar to be detected, the coverage range of the transmitting antenna on the angle simulation equipment can comprehensively cover the change range of the target pitch angle. For example, 10 transmitting antennas on the angle simulation device are provided, the variation range of the target pitch angle is 10 degrees, when the setting interval of the transmitting antennas is large, the height range of the 10 transmitting antennas in the vertical direction is correspondingly large, the distance from the radar pitch angle target simulation system to the radar to be detected can be a little longer, when the setting interval of the transmitting antennas is small, the height range of the 10 transmitting antennas in the vertical direction is also correspondingly small, the distance from the radar pitch angle target simulation system to the radar to be detected can be a little shorter, and in short, the variation range of the target pitch angle in the vertical direction needs to be satisfied. Obviously, the method comprises the following steps: when the simulated target is a moving target, the variation range of the target pitch angle is determined by the motion track of the simulated target, and when the simulated target is a static target, the variation range of the target pitch angle is determined by the arrangement of a plurality of simulated static targets in the vertical direction.
For ease of understanding, the moving object shown in fig. 8 is used as an example for explanation: as shown in fig. 8, the motion trajectory of the simulated target is a parabola, and the target is emitted from the emission point in fig. 8 and falls to the vicinity of the radar to be measured through the parabola motion. When simulation is carried out, a space proportion projection mode is utilized, a simulation target carries out three-dimensional motion in space when carrying out parabolic motion, the target motion track after the space proportion projection occupies a certain range in the vertical direction on an angle simulation plane where a radar pitch angle target simulation system is located, the range corresponds to the change range of a target pitch angle, namely when a radar to be detected is placed at a preset distance, a radar echo signal generated by the target in the range corresponds to the change range of the target pitch angle, and in order to realize pitch angle simulation, the range of a transmitting antenna in the vertical direction should be not smaller than the range occupied by the target motion track after the space proportion projection in the vertical direction on the angle simulation plane where the radar pitch angle target simulation system is located. It should be noted that the motion trajectory of the target in fig. 8 not only relates to the pitch angle, but also relates to the azimuth angle, and accordingly, in order to realize the simulation of the target, the range of the transmitting antenna in the azimuth direction should be no less than the range of the motion trajectory of the target in the azimuth direction occupied by the angle simulation plane where the radar pitch angle target simulation system is located after the space proportion projection. Of course, if the target start position and the target landing position are in the same azimuth, only the pitch angle needs to be concerned.
In step S720, the target simulator receives a radar radiation signal emitted by the radar to be tested through the receiving unit.
When the pitching angle target simulation is carried out, the radar emits radar radiation signals outwards, and the target simulator receives the radar radiation signals emitted by the radar to be tested through the receiving unit.
In step S730, the target simulator generates a radar echo signal according to the received radar radiation signal and the target motion parameter.
In this step, the target motion parameters need to be known, and the target motion parameters may include a target distance and/or a target speed, and the like, and the target motion parameters may be obtained through input or preset. When the simulated target is a moving target, the target motion parameters can be determined in real time according to the target motion track. Then, the target simulator generates a radar echo signal according to the received radar radiation signal and the target motion parameter.
In step S740, the target simulator controls the radar echo signal to be amplified by the amplifier and then output from the transmitting antenna corresponding to the target elevation angle.
And continuously explaining by taking the motion track of the target as a parabola, and calculating the projection position of the movement of the parabola on a plane which is parallel to the angle simulation plane and is positioned at the starting position of the target when the target is at any point on the parabola in real time according to the motion track of the parabola. And calculating the corresponding projection point on the angle simulation plane according to the distance relation between the position and the angle simulation plane. And controlling the transmitting antenna at the corresponding position to transmit the radar echo signal according to the real-time calculated projection point position, thereby simulating the real-time direction and the pitching position of the target. And calculating the slant distance of the simulated target in real time to simulate the three-dimensional motion track of the parabolic motion.
According to the target simulation method for the radar pitch angle, disclosed by the embodiment of the invention, the transmitting antennas are arranged at different positions in the vertical direction of the supporting unit, the target simulator can receive radar radiation signals of a radar to be tested through the receiving unit, radar echo signals are generated according to the received radar radiation signals and target motion parameters, the radar echo signals are controlled to be output from the transmitting antennas corresponding to the target pitch angle after being amplified by the amplifier, and the target pitch angle detection capability of the radar is verified. In the process, the cost of the angle simulation equipment and the target simulator is far lower than that of a high tower and a microwave darkroom, and the construction work of the angle simulation equipment and the target simulator is short. In addition, after the radar pitch angle target simulation system is built, the target motion parameters are set by related personnel in the whole process, and the radar pitch angle target simulation system is convenient and quick. Therefore, compared with the prior art, the cost and the period for verifying the target pitch angle detection capability of the radar are reduced, and the convenience of verification is improved.
Optionally, in a specific implementation manner of the embodiment of the present invention, the method may further include:
and the target simulator determines the target motion parameters of the simulated target and the pitching angle of the simulated target relative to the radar to be detected in real time according to the track control instruction corresponding to the simulated target.
Specifically, the track control instruction comprises real-time motion track information of the simulated target, so that target motion parameters such as the distance and the speed of the target can be determined in real time according to the track control instruction, and the pitch angle of the simulated target relative to the radar to be detected can be determined.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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 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. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the method embodiment, the relevant points can be referred to the partial description of the system embodiment.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A radar pitch angle target simulation system, comprising: an angle simulator and a target simulator; the angle simulation equipment comprises a receiving unit, a transmitting unit and a supporting unit, wherein the receiving unit and the transmitting unit are arranged on the supporting unit; the receiving unit comprises a receiving antenna, the transmitting unit comprises a transmitting antenna and an amplifier, and the transmitting antenna is arranged at different positions in the vertical direction of the supporting unit; the target simulator is configured to: receiving a radar radiation signal of a radar to be detected through the receiving unit, generating a radar echo signal according to the received radar radiation signal and a target motion parameter, and controlling the radar echo signal to be amplified by an amplifier and then output from a transmitting antenna corresponding to a target pitching angle; wherein the target motion parameters include: target distance and/or target speed of the simulated target; and the target pitch angle represents the pitch angle of the simulated target relative to the radar to be detected.
2. The system according to claim 1, wherein the receiving antenna is arranged at different positions on the supporting unit, and the specific arrangement position is adapted to the beam irradiation width of the radar to be tested and the variation range of the target pitch angle; the receiving unit further comprises a power combiner; the power combiner is connected with the receiving antenna and used for synthesizing the radar radiation signals received by the receiving antenna and then sending the radar radiation signals to the target simulator.
3. The system of claim 1, wherein the transmitting unit further comprises: a switch and power supply control module; controlling the radar echo signal to be output from a transmitting antenna corresponding to the target elevation angle after being amplified by an amplifier, and the method comprises the following steps: and sending a pitching angle control instruction to the switch and power supply control module so that the switch and power supply control module determines an amplifier needing power supply according to the pitching angle control instruction and switches the switch to a transmitting antenna corresponding to the target pitching angle.
4. The system of claim 1, wherein the support unit comprises a lifting bar, the receiving unit and the transmitting unit being secured to the lifting bar.
5. The system of claim 1, wherein the target simulator comprises: and the data transmission unit is used for remotely receiving a control instruction of the target simulator.
6. The system of any one of claims 1 to 5, wherein the transmitting unit comprises a plurality of switching amplification modules, the switching amplification modules comprising switches and amplifiers; the switch amplification modules are connected in a multi-division cascade mode, and the switch amplification module at the last stage is connected with the transmitting antenna.
7. The system according to any one of claims 1 to 5, wherein the transmitting unit comprises at least one section, each section comprising a first preset number of switching amplification modules, the switching amplification modules comprising switches and amplifiers; the switch amplification modules are cascaded together, and each switch amplification module is connected with one transmitting antenna.
8. The system according to any one of claims 1 to 5, wherein said transmitting unit comprises at least one section, each section comprising a second predetermined number of switches and an amplifier, each amplifier being located at a front end of each section, said amplifier being cascaded with each of said switches, each of said switches being connected to one of said transmitting antennas through an attenuator.
9. A radar pitch angle target simulation method applied to the radar pitch angle target simulation system according to any one of claims 1 to 8, the method comprising:
placing the radar to be detected at a preset position so that the radar to be detected is located in an XY plane of a coordinate system established in the radar pitch angle target simulation system, wherein the radar pitch angle target simulation system is a preset distance away from the radar to be detected, and the preset distance is adaptive to the change range of the target pitch angle and the setting position of the transmitting antenna;
the target simulator receives the radar radiation signal transmitted by the radar to be detected through the receiving unit;
the target simulator generates a radar echo signal according to the received radar radiation signal and the target motion parameter;
and the target simulator controls the radar echo signal to be amplified by an amplifier and then output from a transmitting antenna corresponding to the target pitching angle.
10. The method of claim 9, further comprising:
and the target simulator determines the target motion parameters of the simulated target and the pitching angle of the simulated target relative to the radar to be detected in real time according to the track control instruction corresponding to the simulated target.
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