CN116718996A - DRFM-based one-dimensional HRRP target simulation method and system - Google Patents
DRFM-based one-dimensional HRRP target simulation method and system Download PDFInfo
- Publication number
- CN116718996A CN116718996A CN202311001226.9A CN202311001226A CN116718996A CN 116718996 A CN116718996 A CN 116718996A CN 202311001226 A CN202311001226 A CN 202311001226A CN 116718996 A CN116718996 A CN 116718996A
- Authority
- CN
- China
- Prior art keywords
- target
- signal
- intermediate frequency
- scattering point
- dimensional
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004088 simulation Methods 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000005516 engineering process Methods 0.000 claims abstract description 20
- 230000015654 memory Effects 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims description 44
- 238000001514 detection method Methods 0.000 claims description 40
- 238000005070 sampling Methods 0.000 claims description 18
- 238000004891 communication Methods 0.000 claims description 10
- 230000001133 acceleration Effects 0.000 claims description 9
- 230000010355 oscillation Effects 0.000 claims description 9
- 230000003111 delayed effect Effects 0.000 claims description 6
- 230000006870 function Effects 0.000 claims description 6
- 238000010606 normalization Methods 0.000 claims description 6
- 230000000295 complement effect Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 230000009191 jumping Effects 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 238000012795 verification Methods 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 101100498818 Arabidopsis thaliana DDR4 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- G01S7/406—Means for monitoring or calibrating by simulation of echoes using internally generated reference signals, e.g. via delay line, via RF or IF signal injection or via integrated reference reflector or transponder
- G01S7/4065—Means for monitoring or calibrating by simulation of echoes using internally generated reference signals, e.g. via delay line, via RF or IF signal injection or via integrated reference reflector or transponder involving a delay line
-
- 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
Abstract
The invention provides a one-dimensional HRRP target simulation method and system based on DRFM, and relates to the technical field of radar electronic countermeasure. The method provided by the invention is based on real-time calculation of target control and air feed target parameters, and the target simulator can work based on line feed or air feed, and only the frequency of a radar transmitting signal is needed to be known in advance, so that the test difficulty is reduced. In addition, the system has high analog signal quality, and due to the pulse phase compensation technology, the phase spurious caused by the high-speed movement of the target is greatly suppressed, and the signal quality is improved. Moreover, the system has less occupied resources; because the first scattering point large delay is adopted, the other scattering points are connected in series with the small delay technology, the high concurrent data throughput rate requirement of the memory caused by the simultaneous reading and writing of the plurality of scattering points in the high-speed signal processing is greatly reduced, and the medium-frequency acquisition based on VP reduces the memory capacity requirement.
Description
Technical Field
The invention relates to the technical field of radar electronic countermeasure, in particular to a one-dimensional HRRP target simulation method and system based on DRFM.
Background
The main functions of the radar are target detection and tracking in early development of the radar, so that the target can be found as early as possible and the information such as the position, the speed and the track of the target can be estimated. Along with the continuous expansion of radar application fields, radar functions are related to various brand-new fields such as battlefield early warning reconnaissance, intelligent target identification, target structure inversion and the like, the obtained target characteristic range is also greatly expanded, such as physical properties such as target length, size, geometric shape, materials and the like.
In the radar target recognition process, target feature extraction and optimization are key steps and preconditions, and how to accurately acquire various target features directly determines the effectiveness of target recognition. Target features that current radars can extract include: motion trajectory features, modulation features, doppler modulation features, polarization features, high resolution features, and the like. However, as the threat to the target types becomes more complex, how to construct targets in multiple scenes to verify the target recognition capability of the radar becomes a problem to be solved by the radar.
As a radar echo simulation core technology of radar high-resolution characteristics, one-dimensional HRRP target simulation can conveniently realize the simulation of various threat targets in a semi-physical environment, and can be widely used for providing corresponding electromagnetic signal environments for electronic countermeasure, radiation source investigation, radar detection, weapon equipment development, performance test and identification so as to conveniently and correctly evaluate the performance index of the weapon equipment. The radar target simulator technology is divided into a DRFM-based forwarding type interference simulation technology and a parameter estimation-based regeneration type interference simulation technology, and meanwhile, the DRFM-based interference simulation technology has the advantages of high generation speed and strong signal coherence, is widely applied to the interference simulation technology, and can conveniently realize target simulation of multiple scattering points. However, the target simulation of multiple scattering points based on DRFM has a large storage throughput requirement, which presents a serious challenge to the external memory data rate bandwidth, while FPGA (Field programmable gate array, field-Programmable Gate Array) has a large data throughput bandwidth, its storage space is small; meanwhile, phase spurious caused by target simulation delay loses the reality of a simulation target, and Chinese patent publication No. CN111289952A discloses a radar target echo simulation method and device.
Disclosure of Invention
The invention aims to: a one-dimensional HRRP target simulation method and system based on DRFM are provided to solve the problems existing in the prior art.
In a first aspect, a one-dimensional HRRP target simulation method based on DRFM is provided, and the method includes the following steps:
s1, dividing the equipment working bandwidth into n sub-frequency bands which are uniformly overlapped in sequence; the sub-frequency band is converted to the same high intermediate frequency bandwidth through a down-conversion technology to generate an intermediate frequency signal, and after DRFM and one-dimensional HRRP processing, the intermediate frequency signal is up-converted to the sub-frequency band in the working bandwidth through an up-conversion technology by using the same local oscillator;
s2, setting local oscillation frequency according to the radar working frequency, so that the radar working frequency is contained in a central area of a certain sub-frequency band, and setting intermediate frequency as high intermediate frequency of radar transmitting signal carrier frequency down-conversion;
s3, performing target control according to target parameters of radar verification test, namely setting a target simulation motion track, and outputting the target distance and speed of a first scattering point (the nearest radar scattering point) in real time; setting target type characteristic parameters (including but not limited to airplanes, missiles, helicopters, ships and tanks) to output target one-dimensional HRRP (high-resolution power) total N scattering point normalization amplitudes, target characteristic modulation signals, N-1 relative intervals relative to the previous scattering point and target RCS (radar cross section area, radar Cross Section) amplitudes in real time;
s4, starting the equipment working time from a microwave intermediate frequency detection VP (Video Pulse), performing AD sampling and DDC (digital down conversion ) according to the intermediate frequency signal in the S1, and performing intermediate frequency acquisition on the DDC signal according to the microwave intermediate frequency detection VP, wherein the duration is the duration of the microwave intermediate frequency detection VP;
s5, performing target overall delay control based on target control, namely converting the target distance of the first scattering point in S3 into target delay to control the intermediate frequency playing starting moment to generate intermediate frequency IQ signals, wherein the duration is the duration of the microwave intermediate frequency detection VP, and synchronously outputting the intermediate frequency playing VP according to the microwave intermediate frequency detection VP;
s6, pulse phase compensation is carried out based on phase rotation, namely, a compensation phase is calculated according to the intermediate frequency in the S2 and the target delay in the S5, pulse phase compensation is carried out on the intermediate frequency IQ signal to generate a phase modulation IQ signal, the duration is the duration of microwave intermediate frequency detection VP, and the intermediate frequency phase modulation VP is synchronously output according to intermediate frequency play VP;
s7, performing one-dimensional HRRP target simulation based on target control, namely performing series delay on the 2~N th path of total N-1 paths of phase modulation IQ signals according to the relative intervals of total N-1 paths of the phase modulation IQ signals relative to the previous scattering point in the S3; according to the N scattering points normalized amplitude and the target characteristic modulation signals in the S3, respectively carrying out amplitude modulation on N paths of phase modulation IQ signals (wherein N-1 paths of delay outputs) and simultaneously carrying out target characteristic modulation; then adding N paths of intermediate frequencies, controlling Doppler frequency shift according to the radar emission signal carrier frequency in S2 and the first scattering point target speed in S3 to generate a one-dimensional HRRP IQ signal, and generating N paths of synchronous delay VP phases or outputting one-dimensional HRRP JP (interference Pulse) according to the phase modulation VP, wherein the duration is one-dimensional HRRP JP duration;
s8, performing DUC (digital up-conversion, digital Up Conversion) on the one-dimensional HRRP IQ signal, and outputting a target analog intermediate frequency signal through DA sampling;
s9, performing RCS target simulation based on target control, namely performing pulse level electric modulation attenuation after up-converting the DA output intermediate frequency signal according to the RCS amplitude in S3, performing switch modulation on the up-converted radio frequency signal according to one-dimensional HRRP JP, and ending the pulse target simulation flow when the duration is one-dimensional HRRP JP duration;
s10, waiting for the next microwave intermediate frequency detection VP, and jumping to S4.
In some implementations of the first aspect, in step S1, the frequency of the sub-bands is converted to the same high intermediate frequency bandwidth by a down-conversion technology to generate an intermediate frequency signal, and the current ADC device and the FPGA chip level are combined to select a 2GHz bandwidth, where the sampling rate is 4.8GSPS, and the sub-bands are sequentially and uniformly overlapped.
In some implementations of the first aspect, the step S2 local oscillator down-converts the sub-band to the same high intermediate frequency, and performs one-dimensional HRRP target simulation at the intermediate frequency.
In some implementations of the first aspect, the target parameter performing target control procedure in step S3 includes at least the following steps:
s301, dividing the simulation target into radial resolution units of N strong scattering points according to the relative position and orientation relation of the radar and the target, wherein each resolution unit can be regarded as an independent point target, the duration of echo is the pulse width PW of the radar transmitting signal, and the echo time delay of the adjacent scattering points is
wherein ,for the i-1 th scattering point and the i-th scattering point interval, C is the propagation velocity of the electromagnetic wave in free space, so that N scattering points will yield N-1 scattering point intervals, and +.>Indicating the i-1 st scattering point and the i-th scattering point delay, and so on; the radar cross-sectional area of each scattering point is +.>Target RCS parameter->Is that
Thereby obtaining N scattering points with normalized amplitude of
wherein ,normalizing the RCS amplitude for the ith scattering point;
s302, when the target scattering point in S301 is a set of rotating scattering points such as helicopter rotor blades, the i-th scattering point target characteristic modulation signal is obtained
wherein ,representing the target characteristic modulation signal of the ith scattering point consisting of K rotor blades, K representing the number of rotor blades,/for>For the kth rotor blade phase modulation signal, < >>Is the kth rotor blade amplitude modulation signal and meets the following requirements
Wherein C is the propagation speed of electromagnetic waves in free space,for radar emission signal carrier frequency, L is rotor blade length (rotation axis is perpendicular to radar and scattering point connection line, if not, the connection line plane perpendicular projection elliptical plane short axis length) and +.>For rotor shaft speed>Echo phase loss (including phase differences due to spacing) of the kth rotor blade for the ith scattering point;
in particular, when the i-th scattering point is a point target or the rotation axis is parallel to the radar and scattering point connection, thenIs constant, i.e. the target characteristic modulation signal of the ith scattering point is
wherein ,echo phase loss (including phase difference due to interval) for the ith scattering point;
s303, calculating the distance and the speed of the target as follows according to the motion track of the target relative to the radar
wherein ,target distance at time t for the 1 st scattering point,/->Target speed at time t for the 1 st scattering point,/->For the 1 st scattering point initial distance, +.>The initial speed of the 1 st scattering point is a 1 st scattering point acceleration, and t is the time of the target motion relative to the starting moment;
s304, calculating the target delay of S5 according to the 1 st scattering point target distance of S303
wherein ,delay for the 1 st scattering point target, < >>For the 1 st scattering point initial distance, +.>The initial speed of the 1 st scattering point is a 1 st scattering point acceleration, and the propagation speed of the electromagnetic wave in the free space is C;
s305, calculating the Doppler shift of S7 according to the 1 st scattering point target speed of S303
wherein ,for Doppler shift, ++>For radar-transmitted signal carrier frequency, and->The initial speed of the 1 st scattering point is a 1 st scattering point acceleration, and the propagation speed of the electromagnetic wave in the free space is C;
s306, neglecting the power loss of the line feed output of the target simulator to the self-transmitting antenna (the power compensation can be increased during engineering operation), and obtaining the target RCS parameter in the S301 processCalculating S9 the target RCS amplitude, namely the target simulator host line feed output power is
wherein ,for the target simulator host line feed output power at time t,/>For the radar effective radiation power of the target direction at time t,/->For the relative distance of the target simulator from the radar at time t, < >>For the target simulator to transmit the antenna gain of the antenna to the radar direction at time t +.>Is the target distance of the target simulated by the target simulator relative to the radar at time t.
In some implementations of the first aspect, the step S4 of performing the microwave intermediate frequency detection VP is a video envelope of the down-converted intermediate frequency signal, the AD sampling uses the intermediate frequency signal to generate a digital intermediate frequency signal, the DDC orthogonalizes the digital intermediate frequency signal to generate a digital IQ signal (digital baseband signal), and the intermediate frequency acquisition performs intermediate frequency acquisition on the digital IQ signal according to the microwave intermediate frequency detection VP for a duration of the microwave intermediate frequency detection VP; the memory used for the intermediate frequency acquisition comprises but is not limited to a Block RAM in the FPGA, a plug-in QDR IV in the FPGA and a DDR4 high-speed read-write device; the intermediate frequency acquisition requires the alignment of a microwave intermediate frequency detection VP and a digital IQ signal, the AD and the DDC can be both in an AD device, and the DDC can be also placed in an FPGA chip.
In some implementations of the first aspect, the delay control start point in step S5 is a rising edge of the microwave intermediate frequency detection VP, and the intermediate frequency IQ signal is a delayed output (with a larger delay range) of the digital IQ signal, that is
wherein ,is an intermediate frequency IQ signal>Is a digital IQ signal, ">Is delayed for the first scattering point and the intermediate frequency playing VP needs to be aligned with the intermediate frequency IQ signal.
In some implementations of the first aspect, the pulse complementary modulation function of step S6 is
wherein ,for pulse complementary modulation function,/->Down-converting the radar transmit signal carrier frequency to the frequency of the intermediate frequency signal,/-, for the radar transmit signal carrier frequency>Delayed for the first scattering point. Further, pulse phase compensation generates a phase-modulated IQ signal as
wherein ,for phase-modulated IQ signals, ">Is an intermediate frequency IQ signal and the intermediate frequency phase modulation VP needs to be aligned with the phase modulated IQ signal.
In some implementations of the first aspect, the one-dimensional HRRP target simulation in step S7 includes at least the following steps:
s701 outputting phase-modulated IQ signals according to the pulse phase-compensating mode of S6And S301N-1 scattering points, and performing series small delay to generate N-1 delay signals (with smaller delay range and determined by radial geometry of the target scattering points)
wherein ,for phase-modulated IQ signals, ">The phase modulated IQ signal is distributed for the i-th scattering point.
S702, modulating the i scattering point distribution phase modulation IQ signal into the N scattering point normalized amplitude and target characteristic modulation signals according to the S301
wherein ,distributing the target IQ signal for the i-th scattering point, a>Normalizing the RCS amplitude for the ith scattering point,/->A target signature modulated signal representing an ith scattering point (including but not limited to consisting of K rotor blades);
s703, distributing target IQ signals according to the N scattering points in S702, wherein the target IQ signals after spatial superposition are
wherein ,for the distributed target IQ signal of target simulation, N is the number of target scattering points, and the width of the target echo is widened after superposition;
s704, calculating the target IQ signal as
wherein ,for Doppler shift, ++>Is a target IQ signal;
s705, the one-dimensional HRRP JP in step S7 needs to be aligned with the target analog rf signal up-converted by the target analog if signal in step S9, so as to control the up-converted target analog rf signal modulation switch.
In some implementations of the first aspect, the DUC in step S8 digitally upconverts the target IQ signal to a target intermediate frequency signal, the DA converts the target intermediate frequency signal to a target analog intermediate frequency signal, and the DA and DUC may both be in a DA device, or the DUC may be in an FPGA chip.
In some implementations of the first aspect, the RCS amplitude in the step S9 is the target simulator host line feed output power in the step S306, and the corresponding electric modulation attenuation code is found according to the line feed output power and the electric modulation attenuation control code table, and the up-conversion module power is controlled; the one-dimensional HRRP JP needs to be aligned with the target analog radio frequency signal up-converted by the target analog intermediate frequency signal to control the radio frequency modulation switch.
In some implementations of the first aspect, the microwave intermediate frequency detection VP in step S10 is a down-converted intermediate frequency signal video envelope.
In a second aspect, a one-dimensional HRRP target simulation system based on DRFM is provided, where the simulation system includes a local oscillation control module, a down-conversion module, an up-conversion module, an AD and DDC module, a DA and DUC module, an intermediate frequency acquisition module, an intermediate frequency playing module, a pulse phase compensation module, a one-dimensional HRRP DDA (delay doppler amplitude ) module, and a target control module.
The local oscillation control module is used for dividing the working frequency band into a plurality of sequentially and uniformly overlapped sub-frequency bands, and frequency-converting the sub-frequency bands to the same high intermediate frequency bandwidth through a down-conversion technology to generate intermediate frequency signals for presetting the sub-frequency bands;
the down-conversion module is used for receiving the radio frequency signals and detecting the radio frequency received down-converted high intermediate frequency signals to generate microwave intermediate frequency detection VP;
the up-conversion module is used for up-converting the target analog intermediate frequency signal into a target analog radio frequency signal, modulating the target analog radio frequency signal according to one-dimensional HRRP JP, and controlling the electrically-modulated attenuator to generate the target analog radio frequency signal with specific power according to the attenuation code searched by the target RCS amplitude;
the AD and DDC module is used for sampling the down-converted intermediate frequency signal AD to generate a digital intermediate frequency signal, and performing DDC conversion to generate a digital IQ signal;
the DA and DUC module is used for performing DUC conversion on the one-dimensional HRRP target IQ signal to generate a target intermediate frequency signal, and generating a target analog intermediate frequency signal through DA sampling;
the intermediate frequency acquisition module is used for acquiring and storing the I/O digital IQ signals;
the intermediate frequency playing module is used for reading the intermediate frequency acquisition signals in a delay manner and generating intermediate frequency IQ signals;
the pulse phase compensation module is used for carrying out phase compensation brought by time delay on the intermediate frequency IQ signal to generate a phase modulation IQ signal;
the one-dimensional HRRP DDA module is used for carrying out one-dimensional HRRP target simulation on the phase-modulated IQ signals to generate target IQ signals with one-dimensional high-resolution target characteristics and one-dimensional HRRP JP;
the target control module is used for realizing target control of target parameters, outputting a target simulation motion track in real time, and outputting N scattering point normalization amplitudes, target characteristic modulation signals, N-1 relative intervals relative to the previous scattering point and target RCS amplitudes of the target one-dimensional HRRP in real time.
In a third aspect, the present invention proposes an electronic device comprising: the device comprises a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface are in communication with each other through the communication bus. The memory is configured to store at least one executable instruction that causes the processor to perform the target simulation method according to the first aspect.
In a fourth aspect, a computer readable storage medium is provided, in which at least one executable instruction is stored, which when executed on an electronic device, causes the electronic device to perform the operations of the target simulation method according to the first aspect.
The invention has the following beneficial effects:
(1) Simulating the true type of the target; the target simulation type comprises aircraft, missile, helicopter, ship and tank, which are not limited by the one-dimensional high-resolution range profile technology.
(2) The analog signal quality is high; due to the pulse phase compensation technology, the phase spurious caused by the high-speed motion of the target is greatly suppressed, and the signal quality is improved.
(3) The occupation of system resources is small; because the first scattering point large delay is adopted, the other scattering points are connected in series with the small delay technology, the high concurrent data throughput rate requirement of the memory caused by the simultaneous reading and writing of the plurality of scattering points in the high-speed signal processing is greatly reduced, and the medium-frequency acquisition based on VP reduces the memory capacity requirement.
(4) The simulation process is easy to operate; based on real-time calculation of target control and air feed (line feed) target parameters, the target simulator can work based on line feed or air feed, only the frequency of a radar transmitting signal is needed to be known in advance, and the test difficulty is reduced.
Drawings
Fig. 1 is a functional block diagram of a one-dimensional HRRP target simulation system.
Fig. 2 is a graph of the motion response of the target track of the present invention.
Fig. 3 is a schematic block diagram of a one-dimensional HRRP DDA module.
Fig. 4 is a one-dimensional HRRP target analog signal timing diagram.
Fig. 5 is a block diagram of a one-dimensional HRRP DDA module implementation.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the invention.
Embodiment one:
the embodiment provides a one-dimensional HRRP target simulation system based on DRFM, which comprises a local oscillation control module, a down-conversion module, an up-conversion module, an AD and DDC module, a DA and DUC module, an intermediate frequency acquisition module, an intermediate frequency play module, a pulse phase compensation module, a one-dimensional HRRP DDA module and a target control module.
The local oscillation control module is used for dividing the working frequency band into a plurality of sequentially and uniformly overlapped sub-frequency bands, and frequency-converting the sub-frequency bands to the same high intermediate frequency bandwidth through a down-conversion technology to generate intermediate frequency signals for presetting the sub-frequency bands;
the down-conversion module is used for receiving and down-converting radio frequency signals, detecting high intermediate frequency signals subjected to down-conversion by the radio frequency receiving module, and generating microwave intermediate frequency detection VP;
the up-conversion module is used for up-converting the target analog intermediate frequency signal into a target analog radio frequency signal, modulating the target analog radio frequency signal according to one-dimensional HRRP JP, and controlling the electrically-modulated attenuator to generate the target analog radio frequency signal with specific power according to the attenuation code searched by the target RCS amplitude;
the AD and DDC module is used for down-converting the intermediate frequency signal 4.8GSPS AD sampling to generate a digital intermediate frequency signal, and the DDC module is used for performing DDC conversion to generate a digital IQ signal;
the DA and DUC module is used for performing DUC conversion on the one-dimensional HRRP target IQ signal to generate a target intermediate frequency signal, and generating a target analog intermediate frequency signal through DA 4.8GSPS sampling;
the intermediate frequency acquisition module is used for acquiring and storing the I/O digital IQ signals;
the intermediate frequency collecting signal of the intermediate frequency playing module carries out delay reading to generate an intermediate frequency IQ signal;
the pulse phase compensation module is used for carrying out phase compensation brought by time delay on the intermediate frequency IQ signal to generate a phase modulation IQ signal;
the one-dimensional HRRP DDA module is used for carrying out one-dimensional HRRP target simulation on the phase-modulated IQ signals to generate target IQ signals with one-dimensional high-resolution target characteristics and one-dimensional HRRP JP;
the target control module is used for realizing target control of target parameters, outputting a target simulation motion track in real time, and outputting N scattering point normalization amplitudes, target characteristic modulation signals, N-1 relative intervals relative to the previous scattering point and target RCS amplitudes of the target one-dimensional HRRP in real time.
Embodiment two:
based on the one-dimensional HRRP target simulation system based on DRFM proposed in the first embodiment, this embodiment proposes a one-dimensional HRRP target simulation method based on DRFM, as shown in fig. 1, the steps of the method are as follows:
s1, dividing the equipment working bandwidth into n sub-frequency bands which are uniformly overlapped in sequence; the sub-frequency band is converted to the same high intermediate frequency bandwidth through a down-conversion technology to generate an intermediate frequency signal, and after DRFM and one-dimensional HRRP processing, the intermediate frequency signal is up-converted to the sub-frequency band in the working bandwidth through an up-conversion technology by using the same local oscillator;
s2, setting local oscillation frequency according to the radar working frequency, so that the radar working frequency is contained in a central area of a certain sub-frequency band, and setting intermediate frequency as high intermediate frequency of radar transmitting signal carrier frequency down-conversion;
s3, performing target control according to target parameters of radar verification test, namely setting a target simulation motion track, and outputting the target distance and speed of a first scattering point (the nearest radar scattering point) in real time; setting ship target type characteristic parameters to output target one-dimensional HRRP (high-resolution power) total N scattering point normalization amplitudes, target characteristic modulation signals, N-1 relative intervals relative to the previous scattering point and target RCS (radar cross section) amplitudes in real time;
s4, starting the equipment working starting time from a microwave intermediate frequency detection VP, carrying out AD sampling and DDC according to the intermediate frequency signals in the S1, and carrying out intermediate frequency acquisition on the DDC signals according to the microwave intermediate frequency detection VP, wherein the duration is the duration of the microwave intermediate frequency detection VP;
s5, performing target overall delay control based on target control, namely converting the target distance of the first scattering point in S3 into target delay to control the intermediate frequency playing starting moment to generate intermediate frequency IQ signals, wherein the duration is the duration of the microwave intermediate frequency detection VP, and synchronously outputting the intermediate frequency playing VP according to the microwave intermediate frequency detection VP;
s6, pulse phase compensation is carried out based on phase rotation, namely, a compensation phase is calculated according to the intermediate frequency in the S2 and the target delay in the S5, pulse phase compensation is carried out on the intermediate frequency IQ signal to generate a phase modulation IQ signal, the duration is the duration of microwave intermediate frequency detection VP, and the intermediate frequency phase modulation VP is synchronously output according to intermediate frequency play VP;
s7, performing one-dimensional HRRP target simulation based on target control, namely performing series delay on the 2~N th path of total N-1 paths of phase modulation IQ signals according to the relative intervals of total N-1 paths of the phase modulation IQ signals relative to the previous scattering point in the S3; according to the N scattering points normalized amplitude and the target characteristic modulation signals in the S3, respectively carrying out amplitude modulation on N paths of phase modulation IQ signals (wherein N-1 paths of delay outputs) and simultaneously carrying out target characteristic modulation; then adding N paths of intermediate frequencies, controlling Doppler frequency shift to generate one-dimensional HRRP IQ signals according to the radar emission signal carrier frequency in S2 and the first scattering point target speed in S3, and generating N paths of synchronous delay VP phases or outputting one-dimensional HRRP JP according to the phase modulation VP, wherein the duration is one-dimensional HRRP JP duration;
s8, performing DUC on the one-dimensional HRRP IQ signal, and outputting a target analog intermediate frequency signal through DA;
s9, performing RCS target simulation based on target control, namely performing pulse level electric modulation attenuation after up-converting the DA output intermediate frequency signal according to the RCS amplitude in S3, performing switch modulation on the up-converted radio frequency signal according to one-dimensional HRRP JP, and ending the pulse target simulation flow when the duration is one-dimensional HRRP JP duration;
s10, waiting for the next microwave intermediate frequency detection VP, and jumping to S4.
Embodiment III:
on the basis of the first embodiment and the second embodiment, the specific implementation of the technical scheme in the embodiment of the invention in a certain item is clearly and completely described by taking a C-band one-dimensional HRRP target simulation system (figure 1) as an example in combination with figures 1-5 of the invention.
S1, referring to a C-band target simulation system shown in FIG. 1, the frequency range is 4-8GHz, and a 2GHZ intermediate frequency bandwidth is adopted to divide the target simulation system into 3 sub-bands of 4-6, 5-7 and 6-8 GHz which are sequentially and uniformly overlapped with 1GHz bandwidth; the down-conversion of the sub-frequency band adopts a high intermediate frequency technology, namely, the down-conversion of a C-band radio frequency signal to 2.6-4.6 GHz, the A/D data rate is 4.8GHz, the model is AD12DL3200, and a two-zone (second-order Nyquist zone) is selected to be 2.6-4.6 GHz; dividing the sampling data of the intermediate frequency signal into 32 paths of parallel processing, and simultaneously selecting 150MHz for an FPGA working clock, wherein the model is XC7V485FFG900-2; and (3) carrying out down-conversion and up-conversion (the frequency conversion process is reciprocal) on the same local oscillator in the same sub-frequency band, wherein the number of the antennas is two, the same linear polarization horn antennas are adopted, the frequency band is covered by 4-8GHz, and the wave beam width pitching is set to 15 x 15 degrees.
S2, setting local oscillation frequency according to the radar working frequency, so that the radar working frequency is contained in a central area of a certain sub-frequency band, for example, when the radar working carrier frequency is 6GHz, setting the sub-frequency band to be 5-7 GHz, and setting the intermediate frequency to be 3.6GHz of high intermediate frequency for down-conversion of radar transmitting signal carrier frequency;
s3, performing target control according to target parameters of radar verification test, namely setting a target simulation motion track, and outputting the target distance of a first scattering point (radar nearest scattering point) in real timeAnd speed->The method comprises the steps of carrying out a first treatment on the surface of the Setting ship target type characteristic parameters to output target one-dimensional HRRP (high-resolution power) total N scattering point normalization amplitudes +.>Target characteristic modulation signal->And N-1 relative intervals with respect to the preceding scattering point>Target RCS amplitude->；
S4, selecting 150MHz as an FPGA working clock, namely 6.67 nanoseconds, starting the equipment working time from a microwave intermediate frequency detection VP, carrying out AD sampling and DDC according to the intermediate frequency signal in S1, carrying out intermediate frequency acquisition on the DDC signal according to the microwave intermediate frequency detection VP, and storing the DDC signal in two external memories QDR II, wherein the model is CY7C1565XV18-600BZXC, and the acquisition time is the duration of the microwave intermediate frequency detection VP;
s5, performing overall target delay control based on target control, namely according to the target distance of the first scattering point in S3Converted into target delay +.>The method comprises the steps of controlling the starting moment of intermediate frequency playing, namely reading an external memory QDR II to generate intermediate frequency IQ signals, wherein the duration is the duration of microwave intermediate frequency detection VP, and synchronously outputting intermediate frequency playing VP according to the microwave intermediate frequency detection VP;
s6, pulse phase compensation is carried out based on phase rotation, namely, according to the intermediate frequency 3.6GHz described in S2 and the target delay described in S5Calculating pulse phase compensationModulation function->Pulse phase compensation is carried out on the intermediate frequency IQ signal to generate a phase modulation IQ signal, the duration is the duration of the microwave intermediate frequency detection VP, and the intermediate frequency phase modulation VP is synchronously output according to the intermediate frequency play VP;
s7, performing one-dimensional HRRP target simulation based on target control, namely according to the total N-1 relative intervals relative to the previous scattering point in S3Carrying out series delay on the 2~N th path of N-1 paths of phase modulation IQ signals; normalizing the amplitude according to the N scattering points described in S3>Target characteristic modulation signal->Respectively carrying out amplitude modulation on N paths of phase-modulated IQ signals (N-1 paths of delay outputs), and simultaneously modulating target characteristics; the N intermediate frequencies are then added together and are based on the radar transmission signal carrier frequency 6GHz as described in S2 and the first scattering point target speed as described in S3->Control Doppler shift +.>Generating one-dimensional HRRP IQ signals, and generating N paths of synchronous delay VP phases or outputting one-dimensional HRRP JP according to the phase modulation VP, wherein the duration is one-dimensional HRRP JP duration, as shown in figure 5;
s8, performing DUC on the one-dimensional HRRP IQ signal, and outputting a target analog intermediate frequency signal through DA, wherein the DA model is AD9164;
s9, performing RCS target simulation based on target control, namely converting the RCS amplitude described in S3 into the target simulator host line feed output power at the time tObtaining the attenuationThe code reduction carries out pulse-level electric modulation attenuation after up-conversion on the DA output intermediate frequency signal, the up-converted radio frequency signal is subjected to switch modulation according to one-dimensional HRRP JP, and the duration is one-dimensional HRRP JP duration, so that the pulse target simulation flow is ended;
s10, waiting for the next microwave intermediate frequency detection VP, and jumping to S4.
Embodiment four:
based on the third embodiment, the operation procedure of the target control in step S3 is as follows:
s301, according to the relative position and orientation relation of the radar and the ship, setting the ship head towards the radar, and dividing the ship into radial resolution units of 32 strong scattering points, wherein each resolution unit can be regarded as an independent point target, the duration of echo is the pulse width PW of a radar transmitting signal, and the echo time delay of adjacent scattering points is
wherein ,for the i-1 st scattering point and the i-th scattering point interval, C is the propagation velocity of the electromagnetic wave in free space, so 32 scattering points will produce 31 scattering point intervals, and +.>Indicating the i-1 st scattering point and the i-th scattering point delay, and so on; the radar cross-sectional area of each scattering point is +.>Target RCS parameter->Is that
Thereby obtaining 32 scattering points with normalized amplitude
wherein ,normalizing the RCS amplitude for the ith scattering point;
s302, target characteristic modulation signalDiscretization production->From this, it can be seen that the ith scattering point is the point target, then +.>Modulating the digital signal to a constant, i.e. the target characteristic of the ith scattering point
Where n is a discrete time series of samples,echo phase loss (including phase difference due to interval) for the ith scattering point;
s303, calculating the distance and the speed of the target as shown in figure 2 according to the motion track of the target relative to the radar
wherein ,target distance at time t for the 1 st scattering point,/->Target speed at time t for the 1 st scattering point,/->For the 1 st scattering point initial distance, +.>The initial speed of the 1 st scattering point is a 1 st scattering point acceleration, and t is the time of the target motion relative to the starting moment;
s304, calculating the target delay of S5 according to the 1 st scattering point target distance of S303
wherein ,delay for the 1 st scattering point target, < >>For the 1 st scattering point initial distance, +.>The initial speed of the 1 st scattering point is a 1 st scattering point acceleration, and the propagation speed of the electromagnetic wave in the free space is C;
s305, calculating the Doppler shift of S7 according to the 1 st scattering point target speed of S303
wherein ,for Doppler shift, ++>For radar-transmitted signal carrier frequency, and->The initial speed of the 1 st scattering point is a 1 st scattering point acceleration, and C is electromagnetic wavePropagation velocity in free space;
s306, neglecting the power loss of the line feed output of the target simulator to the self-transmitting antenna (the power compensation can be increased during engineering operation), and obtaining the target RCS parameter in the S301 processCalculating S9 the target RCS amplitude, namely the target simulator host line feed output power is
wherein ,for the target simulator host line feed output power at time t,/>For the radar effective radiation power of the target direction at time t,/->For the relative distance of the target simulator from the radar at time t, < >>For the target simulator to transmit the antenna gain of the antenna to the radar direction at time t +.>Is the target distance of the target simulated by the target simulator relative to the radar at time t.
Fifth embodiment:
based on the third embodiment, as shown in fig. 5, the operation procedure of the one-dimensional HRRP target simulation in step S7 is as follows:
s701 outputting phase-modulated IQ signals according to the pulse phase-compensating mode of S6Discretized->And the 31 scattering points of the fourth embodiment S301, performing serial small delay to generate 31 delay signals (the delay range is smaller, and the radial geometric dimension of the radar of the target scattering points is determined)
Where n is a sequence of discrete samples,is the inverse of the sampling frequency of 4.8GHz, < >>In order to phase-modulate an IQ digital signal,the phase modulated IQ digital signal is distributed for the i-th scattering point.
S702, modulating the i-th scattering point distribution phase modulation IQ digital signal into the 32 scattering point normalized amplitude and target feature modulation digital signals according to the fourth embodiment S301
Where n is a sequence of discrete samples,distributing the target IQ digital signal for the i-th scattering point, a>Normalizing the RCS amplitude for the ith scattering point,/->Modulating the digital signal with a target feature representative of an ith scattering point;
s703, distributing target IQ digital signals according to the 32 scattering points described in S702, wherein the target IQ digital signals after spatial superposition are
Where n is a sequence of discrete samples,for the distributed target IQ digital signal of the target simulation, the target echo width is widened after superposition, as shown in fig. 4;
s704, according to the distributed target IQ digital signal and the Doppler shift in S305Calculating the target IQ digital signal as
wherein ,for Doppler shift, ++>For the target IQ digital signal, ">The sampling time is the reciprocal of the sampling frequency of 4.8GHz, which is about 0.208333 nanoseconds;
s705, after the one-dimensional HRRP JP is aligned with the target analog radio frequency signal of the target analog intermediate frequency signal up-conversion in S9, controlling an up-conversion radio frequency signal modulation switch.
As described above, although the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limiting the invention itself. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The one-dimensional HRRP target simulation method based on the DRFM is characterized by comprising the following steps of:
s1, dividing the equipment working bandwidth into n sub-frequency bands which are uniformly overlapped in sequence: the sub-frequency band is converted to the same high intermediate frequency bandwidth to generate an intermediate frequency signal, and after DRFM and one-dimensional HRRP processing, the intermediate frequency signal is up-converted to the sub-frequency band in the working bandwidth by using the same local oscillator;
s2, setting local oscillation frequency according to the radar working frequency, so that the radar working frequency is contained in a central area of a certain sub-frequency band, and setting intermediate frequency as high intermediate frequency of radar transmitting signal carrier frequency down-conversion;
s3, performing target control according to target parameters of the radar verification test: setting a target simulation motion track, and outputting the target distance and speed of a first scattering point in real time; setting target type characteristic parameters to output target one-dimensional HRRP (high-resolution power) total N scattering point normalization amplitudes, target characteristic modulation signals, N-1 relative intervals relative to the previous scattering point and target RCS (radar cross section) amplitudes in real time;
s4, starting the equipment working time from a microwave intermediate frequency detection VP, performing AD sampling and digital down-conversion operation according to the intermediate frequency signal in S1, and performing intermediate frequency acquisition on the DDC signal according to the microwave intermediate frequency detection VP, wherein the duration is the duration of the microwave intermediate frequency detection VP;
s5, performing target overall delay control based on target control, namely converting the target distance of the first scattering point in S3 into target delay to control the intermediate frequency playing starting moment to generate intermediate frequency IQ signals, wherein the duration is the duration of the microwave intermediate frequency detection VP, and synchronously outputting the intermediate frequency playing VP according to the microwave intermediate frequency detection VP;
s6, pulse phase compensation is carried out based on phase rotation, namely, a compensation phase is calculated according to the intermediate frequency in the S2 and the target delay in the S5, pulse phase compensation is carried out on the intermediate frequency IQ signal to generate a phase modulation IQ signal, the duration is the duration of microwave intermediate frequency detection VP, and the intermediate frequency phase modulation VP is synchronously output according to intermediate frequency play VP;
s7, performing one-dimensional HRRP target simulation based on target control, and performing series delay on the 2~N th path of total N-1 paths of phase modulation IQ signals according to the relative intervals of total N-1 paths of relative to the previous scattering point in the S3; according to the N scattering points normalized amplitude and the target characteristic modulation signals in the S3, respectively carrying out amplitude modulation on N paths of phase modulation IQ signals, and simultaneously carrying out target characteristic modulation;
adding N paths of intermediate frequencies, controlling Doppler frequency shift according to the radar emission signal carrier frequency in S2 and the first scattering point target speed in S3 to generate a one-dimensional HRRP IQ signal, and generating N paths of synchronous delay VP phases or outputting one-dimensional HRRP JP according to the phase modulation VP, wherein the duration is one-dimensional HRRP JP duration;
s8, performing digital up-conversion operation on the one-dimensional HRRP IQ signal, and outputting a target analog intermediate frequency signal through DA sampling;
s9, performing RCS target simulation based on target control, namely performing pulse level electric modulation attenuation after up-converting the DA output intermediate frequency signal according to the RCS amplitude in S3, performing switch modulation on the up-converted radio frequency signal according to one-dimensional HRRP JP, and ending the pulse target simulation flow when the duration is one-dimensional HRRP JP duration;
s10, waiting for the next microwave intermediate frequency detection VP, and jumping to S4.
2. The target simulation method according to claim 1, wherein the target parameter performing target control process in step S3 includes at least the steps of:
s301, dividing a simulation target into radial resolution units of N strong scattering points according to the relative position and orientation relation of a radar and the target, wherein each resolution unit can be regarded as an independent point target, the duration of echo is a pulse width PW of a radar transmitting signal, and the echo time delay of adjacent scattering points is as follows:
；
wherein ,for the i-1 th scattering point and the i-th scattering point interval, C is the propagation velocity of the electromagnetic wave in free space, so that N scattering points will yield N-1 scattering point intervals, and +.>Indicating the i-1 st scattering point and the i-th scattering point delay, and so on; the radar cross-sectional area of each scattering point is +.>Target RCS parameter->The method comprises the following steps:
；
the normalized amplitude of the N scattering points can be obtained by the method:
；
wherein ,normalizing the RCS amplitude for the ith scattering point;
s302, when the target scattering point in S301 is a rotating scattering point set such as a helicopter rotor blade, the i-th scattering point target characteristic modulation signal is obtained as follows:
；
wherein ,representing the target characteristic modulation signal of the ith scattering point consisting of K rotor blades, K representing the number of rotor blades,/for>For the kth rotor blade phase modulation signal, < >>The kth rotor blade amplitude modulation signal, and satisfies:
；
wherein C is the propagation speed of electromagnetic waves in free space,for radar-transmitted signal carrier frequency,/->For rotor blade length->For rotor shaft speed>Echo phase loss of the kth rotor blade for the ith scattering point;
s303, calculating the distance and the speed of the target according to the motion track of the target relative to the radar, wherein the distance and the speed are as follows:
；
wherein ,target distance at time t for the 1 st scattering point,/->Target speed at time t for the 1 st scattering point,/->For the 1 st scattering point initial distance, +.>The initial speed of the 1 st scattering point is a 1 st scattering point acceleration, and t is the time of the target motion relative to the starting moment;
s304, calculating the target delay of S5 according to the target distance of the 1 st scattering point in S303, wherein the target delay is as follows:
；
wherein ,delay for the 1 st scattering point target, < >>For the 1 st scattering point initial distance, +.>The initial speed of the 1 st scattering point is a 1 st scattering point acceleration, and the propagation speed of the electromagnetic wave in the free space is C;
s305, calculating the Doppler frequency shift of S7 according to the target speed of the 1 st scattering point in S303, wherein the Doppler frequency shift is as follows:
；
wherein ,for Doppler shift, ++>For radar-transmitted signal carrier frequency, and->The initial speed of the 1 st scattering point is a 1 st scattering point acceleration, and the propagation speed of the electromagnetic wave in the free space is C;
s306, neglecting the line feed output of the target simulator to self-generationPower loss of the radio antenna is determined by the target RCS parameter in S301 processAnd S9, calculating the target RCS amplitude, namely the target simulator host line feed output power, as follows:
；
wherein ,for the target simulator host line feed output power at time t,/>For the radar effective radiation power of the target direction at time t,/->For the relative distance of the target simulator from the radar at time t, < >>For the target simulator to transmit the antenna gain of the antenna to the radar direction at time t +.>Is the target distance of the target simulated by the target simulator relative to the radar at time t.
3. The target simulation method according to claim 1, wherein in step S5, the delay control start point is a rising edge of a microwave intermediate frequency detection VP, and the intermediate frequency IQ signal is a digital IQ signal and is output in a delayed manner:
；
wherein ,is an intermediate frequency IQ signal>Is a digital IQ signal, ">Is delayed for the first scattering point and the intermediate frequency playing VP needs to be aligned with the intermediate frequency IQ signal.
4. The method according to claim 1, wherein the pulse complementary modulation function in step S6 is:
；
wherein ,for pulse complementary modulation function,/->Down-converting the radar transmit signal carrier frequency to the frequency of the intermediate frequency signal,/-, for the radar transmit signal carrier frequency>Delayed for the first scattering point.
5. The method of claim 4, wherein the pulse complementary phase generating phase-modulated IQ signal is:
；
wherein ,for phase-modulated IQ signals, ">Is an intermediate frequency IQ signal and the intermediate frequency phase modulation VP needs to be aligned with the phase modulated IQ signal.
6. The target simulation method according to claim 1, wherein the one-dimensional HRRP target simulation process of step S7 includes at least the following steps:
s701 outputting phase-modulated IQ signals according to the pulse phase-compensating mode of S6And S301, performing series small delay to generate N-1 paths of delay signals at intervals of N-1 scattering points, wherein the N-1 paths of delay signals are as follows:
；
wherein ,for phase-modulated IQ signals, ">Distributing phase-modulated IQ signals for the ith scattering point;
s702, modulating an ith scattering point distribution phase modulation IQ signal according to the N scattering point normalized amplitude and target characteristic modulation signals of S301:
；
wherein ,distributing the target IQ signal for the i-th scattering point, a>Normalizing the RCS amplitude for the ith scattering point,/->A target characteristic modulated signal representing an ith scattering point;
s703, distributing target IQ signals according to the N scattering points described in S702, where the target IQ signals after spatial superposition are:
；
wherein ,for the distributed target IQ signal of target simulation, N is the number of target scattering points, and the width of the target echo is widened after superposition;
s704, calculating target IQ signals according to the distributed target IQ signals and the Doppler shift in S305, wherein the target IQ signals are:
；
wherein ,for Doppler shift, ++>Is a target IQ signal;
s705, the one-dimensional HRRP JP in step S7 needs to be aligned with the target analog rf signal up-converted by the target analog if signal in step S8, so as to control the up-converted target analog rf signal modulation switch.
7. A DRFM-based one-dimensional HRRP target simulation system, comprising:
the local oscillation control module is used for dividing the working frequency band into a plurality of sub-frequency bands which are uniformly overlapped in sequence, and converting the sub-frequency bands to the same high intermediate frequency bandwidth through a down-conversion technology to generate intermediate frequency signals which are used for presetting the sub-frequency bands;
the down-conversion module is used for receiving and down-converting radio frequency signals, detecting the high intermediate frequency signals of the down-conversion of the radio frequency reception, and generating microwave intermediate frequency detection VP;
the up-conversion module is used for up-converting the target analog intermediate frequency signal into a target analog radio frequency signal, modulating the target analog radio frequency signal according to one-dimensional HRRP JP, and controlling the electrically-modulated attenuator to generate the target analog radio frequency signal with specific power according to the attenuation code searched by the target RCS amplitude;
the AD and DDC module is used for generating a digital intermediate frequency signal by down-converting the intermediate frequency signal 4.8GSPS AD sampling and generating a digital IQ signal by DDC conversion;
the DA and DUC module is used for performing DUC conversion on the one-dimensional HRRP target IQ signal to generate a target intermediate frequency signal, and generating a target analog intermediate frequency signal through DA 4.8GSPS sampling;
the intermediate frequency acquisition module is used for acquiring and storing the I/O digital IQ signals;
the intermediate frequency playing module is used for collecting intermediate frequency signals and carrying out delay reading to generate intermediate frequency IQ signals;
the pulse phase compensation module is used for carrying out phase compensation brought by time delay on the intermediate frequency IQ signal to generate a phase modulation IQ signal;
the one-dimensional HRRP DDA module is used for carrying out one-dimensional HRRP target simulation on the phase-modulated IQ signals to generate target IQ signals with one-dimensional high-resolution target characteristics and one-dimensional HRRP JP;
the target control module is used for realizing target control on target parameters, outputting a target simulated motion track in real time, and outputting the normalized amplitude of N scattering points, the target characteristic modulation signal, N-1 relative intervals relative to the previous scattering point and the target RCS amplitude of the target one-dimensional HRRP in real time.
8. An electronic device, comprising: the device comprises a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface complete communication with each other through the communication bus;
the memory is configured to hold at least one executable instruction that causes the processor to perform the target simulation method of any one of claims 1 to 6.
9. A computer readable storage medium, wherein at least one executable instruction is stored in the storage medium, which when run on an electronic device, causes the electronic device to perform the operations of the target simulation method according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311001226.9A CN116718996B (en) | 2023-08-10 | 2023-08-10 | DRFM-based one-dimensional HRRP target simulation method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311001226.9A CN116718996B (en) | 2023-08-10 | 2023-08-10 | DRFM-based one-dimensional HRRP target simulation method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116718996A true CN116718996A (en) | 2023-09-08 |
| CN116718996B CN116718996B (en) | 2023-11-03 |
Family
ID=87866468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311001226.9A Active CN116718996B (en) | 2023-08-10 | 2023-08-10 | DRFM-based one-dimensional HRRP target simulation method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116718996B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117554904A (en) * | 2024-01-11 | 2024-02-13 | 南京航天工业科技有限公司 | Single pulse cross polarization interference method and system based on orthogonal polarization double channels |
Citations (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3239825A (en) * | 1963-05-24 | 1966-03-08 | Ca Nat Research Council | Target simulating apparatus for use in a radar system |
| JPS593278A (en) * | 1982-06-29 | 1984-01-09 | Fujitsu Ltd | Echo signal synchronizing system of radar echo simulator |
| US4730191A (en) * | 1984-03-08 | 1988-03-08 | Dornier System Gmbh | Radar simulation |
| US5117230A (en) * | 1991-04-12 | 1992-05-26 | The United States Of America As Represented By The Secretary Of The Army | Electronic target radar simulator |
| US6498583B1 (en) * | 2001-12-27 | 2002-12-24 | Chung-Shan Institute Of Science And Technology | Real time multiple simulated targets generator for mono pulse radar |
| CN102590794A (en) * | 2012-02-28 | 2012-07-18 | 北京航空航天大学 | Broadband coherent radar target simulator |
| CN103616672A (en) * | 2013-12-02 | 2014-03-05 | 中国电子科技集团公司第二十九研究所 | Broadband radar space target characteristic signal simulator |
| CN103760535A (en) * | 2014-01-23 | 2014-04-30 | 中国人民解放军海军航空工程学院 | High-resolution radar target echo signal generating method |
| CN204086526U (en) * | 2014-09-28 | 2015-01-07 | 南京长峰航天电子科技有限公司 | A kind of radar echo simulator |
| CN107192991A (en) * | 2017-07-18 | 2017-09-22 | 中国人民解放军国防科学技术大学 | A kind of radio-frequency radiation formula emulates wideband pulse radar imagery equivalent simulation method |
| JP2018031655A (en) * | 2016-08-24 | 2018-03-01 | 三菱重工業株式会社 | Simulation target generation device and method |
| CN108089164A (en) * | 2017-10-30 | 2018-05-29 | 北京航天福道高技术股份有限公司 | A kind of broadband target simulator signal processing unit |
| CN108459308A (en) * | 2018-03-29 | 2018-08-28 | 北京环境特性研究所 | A kind of analogue echoes method and device based on time-varying RCS data |
| CN110208760A (en) * | 2019-05-27 | 2019-09-06 | 西安空间无线电技术研究所 | A kind of radar return emulation mode based on time domain up-sampling |
| US20190391234A1 (en) * | 2016-12-29 | 2019-12-26 | Avl List Gmbh | Radar target emulator having a superimposition apparatus and method for superimposing signals |
| CN111289952A (en) * | 2020-03-27 | 2020-06-16 | 华清瑞达（天津）科技有限公司 | Radar target echo simulation method and device |
| CN111474525A (en) * | 2020-04-16 | 2020-07-31 | 上海交通大学 | Ultra-wideband radar target echo signal simulation method and simulator |
| CN113238196A (en) * | 2021-05-22 | 2021-08-10 | 中国船舶重工集团公司第七二三研究所 | Radar echo simulation method based on radio frequency scene storage |
| CN114384482A (en) * | 2021-12-31 | 2022-04-22 | 北京无线电计量测试研究所 | 2GHz instantaneous bandwidth radar target echo simulation system |
| CN114814740A (en) * | 2022-04-29 | 2022-07-29 | 中国电子科技集团公司第十四研究所 | High-fidelity target simulation method based on multiple scattering points |
| CN116125412A (en) * | 2023-04-14 | 2023-05-16 | 北京中科睿信科技有限公司 | Helicopter rotor echo real-time simulation system and method based on DRFM |
| CN116136584A (en) * | 2023-04-14 | 2023-05-19 | 北京中科睿信科技有限公司 | FPGA and DDR 4-based large-bandwidth beyond-view-range radar distance simulation device and method |
| CN116203520A (en) * | 2023-05-05 | 2023-06-02 | 成都玖锦科技有限公司 | Random target simulation method based on multiple scattering centers |
-
2023
- 2023-08-10 CN CN202311001226.9A patent/CN116718996B/en active Active
Patent Citations (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3239825A (en) * | 1963-05-24 | 1966-03-08 | Ca Nat Research Council | Target simulating apparatus for use in a radar system |
| JPS593278A (en) * | 1982-06-29 | 1984-01-09 | Fujitsu Ltd | Echo signal synchronizing system of radar echo simulator |
| US4730191A (en) * | 1984-03-08 | 1988-03-08 | Dornier System Gmbh | Radar simulation |
| US5117230A (en) * | 1991-04-12 | 1992-05-26 | The United States Of America As Represented By The Secretary Of The Army | Electronic target radar simulator |
| US6498583B1 (en) * | 2001-12-27 | 2002-12-24 | Chung-Shan Institute Of Science And Technology | Real time multiple simulated targets generator for mono pulse radar |
| CN102590794A (en) * | 2012-02-28 | 2012-07-18 | 北京航空航天大学 | Broadband coherent radar target simulator |
| CN103616672A (en) * | 2013-12-02 | 2014-03-05 | 中国电子科技集团公司第二十九研究所 | Broadband radar space target characteristic signal simulator |
| CN103760535A (en) * | 2014-01-23 | 2014-04-30 | 中国人民解放军海军航空工程学院 | High-resolution radar target echo signal generating method |
| CN204086526U (en) * | 2014-09-28 | 2015-01-07 | 南京长峰航天电子科技有限公司 | A kind of radar echo simulator |
| JP2018031655A (en) * | 2016-08-24 | 2018-03-01 | 三菱重工業株式会社 | Simulation target generation device and method |
| US20190391234A1 (en) * | 2016-12-29 | 2019-12-26 | Avl List Gmbh | Radar target emulator having a superimposition apparatus and method for superimposing signals |
| CN107192991A (en) * | 2017-07-18 | 2017-09-22 | 中国人民解放军国防科学技术大学 | A kind of radio-frequency radiation formula emulates wideband pulse radar imagery equivalent simulation method |
| CN108089164A (en) * | 2017-10-30 | 2018-05-29 | 北京航天福道高技术股份有限公司 | A kind of broadband target simulator signal processing unit |
| CN108459308A (en) * | 2018-03-29 | 2018-08-28 | 北京环境特性研究所 | A kind of analogue echoes method and device based on time-varying RCS data |
| CN110208760A (en) * | 2019-05-27 | 2019-09-06 | 西安空间无线电技术研究所 | A kind of radar return emulation mode based on time domain up-sampling |
| CN111289952A (en) * | 2020-03-27 | 2020-06-16 | 华清瑞达（天津）科技有限公司 | Radar target echo simulation method and device |
| CN111474525A (en) * | 2020-04-16 | 2020-07-31 | 上海交通大学 | Ultra-wideband radar target echo signal simulation method and simulator |
| CN113238196A (en) * | 2021-05-22 | 2021-08-10 | 中国船舶重工集团公司第七二三研究所 | Radar echo simulation method based on radio frequency scene storage |
| CN114384482A (en) * | 2021-12-31 | 2022-04-22 | 北京无线电计量测试研究所 | 2GHz instantaneous bandwidth radar target echo simulation system |
| CN114814740A (en) * | 2022-04-29 | 2022-07-29 | 中国电子科技集团公司第十四研究所 | High-fidelity target simulation method based on multiple scattering points |
| CN116125412A (en) * | 2023-04-14 | 2023-05-16 | 北京中科睿信科技有限公司 | Helicopter rotor echo real-time simulation system and method based on DRFM |
| CN116136584A (en) * | 2023-04-14 | 2023-05-19 | 北京中科睿信科技有限公司 | FPGA and DDR 4-based large-bandwidth beyond-view-range radar distance simulation device and method |
| CN116203520A (en) * | 2023-05-05 | 2023-06-02 | 成都玖锦科技有限公司 | Random target simulation method based on multiple scattering centers |
Non-Patent Citations (15)
| Title |
|---|
| DEPING ZHANG等: "A real continuously moving target simulation system design without time delay error", 2014 IEEE INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING, COMMUNICATIONS AND COMPUTING (ICSPCC), pages 258 - 261 * |
| HUANG, H等: "Hardware-in-the-loop simulation technology of wide-band radar targets based on scattering center model", CHINESE JOURNAL OF AERONAUTICS, vol. 28, no. 5, pages 1476 - 1484, XP055325574, DOI: 10.1016/j.cja.2015.07.006 * |
| PEDRO C. NARIYOSHI等: "Interpolation methods for economical pulse-echo signal synthesis", 2014 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM, pages 2201 - 2204 * |
| 丁泽刚;温亮;: "SAR自然场景实时回波模拟器的设计与实现", 实验技术与管理, no. 01, pages 81 - 85 * |
| 于涛等: "基于补偿调制的ISAR电子伪装干扰技术", 火力与指挥控制, vol. 36, no. 6, pages 27 - 30 * |
| 宿纪民;汪普宏;: "一种超宽带相参雷达目标模拟器设计", 国外电子测量技术, no. 01, pages 73 - 76 * |
| 张利军: "雷达成像的电磁仿真研究", 中国优秀硕士学位论文全文数据库 (信息科技辑), pages 136 - 460 * |
| 张武才;潘明海;陈诗弘;: "基于LFM子脉冲的宽带雷达目标回波模拟方法", 系统工程与电子技术, no. 04, pages 82 - 88 * |
| 张珂;王震;舒建涛;王中洋;张翔;: "基于数字射频存储的引信面目标回波模拟器", 探测与控制学报, no. 05, pages 18 - 24 * |
| 杨俊岭: "海杂波建模及雷达信号模拟系统关键技术研究", 中国博士学位论文全文数据库 (信息科技辑), pages 136 - 69 * |
| 王超;李毅;袁乃昌;: "高分辨雷达目标回波模拟器设计", 系统工程与电子技术, no. 08, pages 58 - 60 * |
| 简柏杨;: "基于混沌编码的OFDM雷达ISAR成像抗干扰性能分析", 企业技术开发, no. 23, pages 71 - 75 * |
| 那洪祥;: "基于DRFM的高分辨雷达扩展目标回波仿真技术", 海军航空工程学院学报, no. 04, pages 11 - 14 * |
| 郭伟, 姜景山, 刘和光: "海面回波模拟器方案设计", 遥感技术与应用, no. 02, pages 16 - 19 * |
| 黄琳琳;夏伟杰;周莹;齐媛媛;: "动态目标宽带雷达回波频域模拟及成像仿真", 航空兵器, no. 06, pages 61 - 65 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117554904A (en) * | 2024-01-11 | 2024-02-13 | 南京航天工业科技有限公司 | Single pulse cross polarization interference method and system based on orthogonal polarization double channels |
| CN117554904B (en) * | 2024-01-11 | 2024-03-26 | 南京航天工业科技有限公司 | Single pulse cross polarization interference method and system based on orthogonal polarization double channels |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116718996B (en) | 2023-11-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102435984B (en) | Echo simulation device for Doppler radar and implementation method thereof | |
| CN109001697B (en) | Multi-target radar echo simulator | |
| EP2005210B1 (en) | Methods and systems for generating virtual radar targets | |
| CN116718996B (en) | DRFM-based one-dimensional HRRP target simulation method and system | |
| CN106842166A (en) | A kind of solution velocity ambiguity method suitable for LFMCW radar system | |
| CN106443653A (en) | Radar device | |
| CN105891791B (en) | Multiple Target Signals generation method and radio frequency multi-target signal | |
| CN113777577B (en) | Target detection method and device based on MIMO radar and electronic equipment | |
| CN109901165B (en) | Satellite-borne SAR echo simulation device and method | |
| Savci et al. | Noise radar—overview and recent developments | |
| CN107192991A (en) | A kind of radio-frequency radiation formula emulates wideband pulse radar imagery equivalent simulation method | |
| CN104849704A (en) | Radar target, interference, and clutter integrated simulation system | |
| Farina et al. | Multitarget interleaved tracking for phased-array radar | |
| CN109917381A (en) | The synthetic aperture radar interference method of array antenna is controlled based on frequency | |
| Higgins et al. | Passive multistatic radar experiment using WiMAX signals of opportunity. Part 1: Signal processing | |
| Tan et al. | An efficient range-Doppler domain ISAR imaging approach for rapidly spinning targets | |
| CN116203520A (en) | Random target simulation method based on multiple scattering centers | |
| CN111736129B (en) | Space-time modulation bistatic radar system, implementation method and medium thereof | |
| CN113109797B (en) | Method and device for detecting target of frequency modulation continuous wave staring radar and computer equipment | |
| CN106526544B (en) | MIMOSAR clutter suppression method based on hypersonic platform | |
| CN109471110B (en) | Multi-target signal simulation method and device for millimeter wave radar for vehicle | |
| US6128589A (en) | Method and apparatus for modelling a system which includes the transmission and reception of signals | |
| CN117554904B (en) | Single pulse cross polarization interference method and system based on orthogonal polarization double channels | |
| Fadhil et al. | Design a prototype FPGA model for target detection by radars passive based on synthetic-aperture radar algorithm | |
| CN108594229A (en) | The compensation method of Doppler effect two dimension, device and storage medium in satellite-borne SAR arteries and veins |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |