CN110988823A - Interference signal modulation method for injection type interference semi-physical radar simulator - Google Patents
Interference signal modulation method for injection type interference semi-physical radar simulator Download PDFInfo
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- CN110988823A CN110988823A CN201911153080.3A CN201911153080A CN110988823A CN 110988823 A CN110988823 A CN 110988823A CN 201911153080 A CN201911153080 A CN 201911153080A CN 110988823 A CN110988823 A CN 110988823A
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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
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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
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
- G01S7/414—Discriminating targets with respect to background clutter
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Abstract
The invention discloses an interference signal modulation method of an injection type interference semi-physical radar simulator, wherein a software radar receives an injection type interference signal and modulates a radio frequency interference signal of an interference machine according to the direction and the distance according to virtual station distribution information issued by a pilot modulation system to produce interference signal IQ data; the software radar receives a target space situation issued by the guiding and adjusting seat, and completes generation of target and clutter IQ data according to mathematical modeling; the software radar carries out vector synthesis on the modulated interference signal IQ data, the space situation IQ data and the clutter IQ data; the synthesized data are radar baseband sampling signals and can be used for realizing radar signal processing and data processing algorithms.
Description
Technical Field
The invention relates to a method for modulating interference signals of a radar training simulator, in particular to a method for modulating interference signals of a semi-physical radar simulator with injection type interference, and belongs to the technical field of radar simulation trainers.
Background
The data generation of the radar training simulator comprises two parts of interference signal generation, target generation and clutter signal generation. There are two situations. The first condition is as follows: the interference signal is a fundamental frequency digital signal directly generated according to the model, has a certain deviation with a real jammer signal, cannot respond to radar anti-interference operation, and cannot meet the scene of closed-loop countermeasures between interference equipment and radar equipment in the actual radar electronic countermeasures process. Case two: the interference signal comes from the radio frequency signal of the jammer, and after the signal is input to the microwave integrated chip, the baseband IQ signal is output according to the receiver index of the simulated radar. The baseband IQ signal at this time is a signal of a real received jammer, but the jammer signal does not conform to the actual combat environment, and appears as follows: the power is independent of the position between the jammer and the radar; the power is independent of the radar antenna pattern; the power is independent of the radar scan orientation. The two situations can not meet the requirement of electronic countermeasure of the actual combat radar.
Disclosure of Invention
The invention aims to solve the problems and provide a method for modulating interference signals of an injection interference semi-physical radar simulator.
The invention realizes the purpose through the following technical scheme: an interference signal modulation method of an injection type interference semi-physical radar simulator comprises the following steps:
the method comprises the following steps: setting guiding and thinking information comprising target information f3, clutter information f2, interference information f1 and analog radar information f 0;
step two: the radar training simulator generates target signals VT1 and VT2 … VTM after fundamental frequency extraction according to the preset information and the target information f3 in the step one;
step three: the radar training simulator generates clutter signals VZ1 and VZ2 … VZN after fundamental frequency extraction according to the scenario information and the clutter information f2 in the step one;
step four: injecting a radio frequency signal A generated by an interference machine, wherein the frequency of the interference signal is 0-9 GHz, and the instantaneous bandwidth is not more than 1.2 GHz;
step five: adjusting working parameters of the microwave integration module according to f0 such as frequency, bandwidth, repetition frequency and the like of the simulated radar, forming interference response of the jammer in the simulated radar system, and performing down-conversion, filtering and extraction to obtain baseband interference signals VG1 and VG2 … VGX;
step six: performing power modulation and orientation modulation on VG1 and VG2 … VGX according to the interference orientation, distance and intensity information f1 of the pilot modulation to generate interference signals VTG1 and VTG2 … VTGX;
step seven: according to the antenna directional diagram information of the main channel and the auxiliary channel, linearly superposing target signals VT1 and VT2 … VTM, clutter signals VZ1 and VZ2 … VZN, interference signals VTG1 and VTG2 … VTGX to generate main channel simulation data SZ and auxiliary channel simulation data SF;
step eight: side lobe shading processing is carried out on the main channel simulation data SZ and the auxiliary channel simulation data SF to obtain a shaded channel SN;
step nine: radar signal processing is carried out on the SN, and algorithms such as channel correction, pulse compression, super clutter detection, moving target display, constant false alarm detection and the like are included to obtain a detection video SC and a background video SZ;
step ten: performing radar data processing algorithms including point track aggregation, track correlation, track tracking and other algorithms on the SC to obtain a plurality of tracks T;
step eleven: and displaying the effect of the radar under the condition of interference on the simulated radar terminal, wherein the effect comprises a track T, a detection video SC, a background video SZ and the like.
As a still further scheme of the invention: and in the fourth step, the interference signal is a radio frequency signal output by the jammer, and the power and the direction of the interference signal are modulated according to the guiding and adjusting information.
As a still further scheme of the invention: in the second step and the third step, the radar training simulator realizes the generation of the radar effect of the simulated mechanical scanning, phased array scanning and phased array staring system through software radio technology, hardware platformization and software parameterization.
As a still further scheme of the invention: the radar training simulator modulates the power of the digital interference signal according to the planned information, the station arrangement position, the working frequency and the bandwidth information in the step one;
the power modulation formula is:
power1db＝jammer+1md-K-Rdb-Lj。
wherein power1_ db is output after power modulation; jammer is the power of the jammer,
pt is the transmitting power of the jammer, Br is the proportion of the jammer bandwidth falling into the radar bandwidth, and B is the jammer bandwidth; 1md is radar working frequency factor, and 1md is 10 × log10(300/f0), wherein f0 is the radar working frequency in MHz; k is the constant K10 × log10(1.38×42×π2) (ii) a Rdb is the attenuation over distance, 20 × log10(R); and Lj is the one-way propagation loss of the jammer, and is 6 dB.
As a still further scheme of the invention: the radar training simulator carries out azimuth modulation on the digital interference signal according to the planned information, the station arrangement position and the antenna directional diagram of the radar in the step one to generate interference data;
the orientation modulation formula:
power2db＝power1db+Gr_Rad(θ)+Gr J am(θ)
wherein power1dbIs the result of 6 power modulations; gr _ Rad (theta) is the gain of the radar receiving antenna in the theta direction; GrJ am (theta) is the gain of the transmitting antenna of the interference unit in the theta direction; final interference power
The invention has the beneficial effects that: the interference signal modulation method of the injection type interference semi-physical software radar training simulator is reasonable in design:
1. the interference signal is a radio frequency signal output by the interference machine, and the power and the direction of the interference signal are modulated according to the pilot modulation information, so that the interference signal accords with the station arrangement effect and the radar directional diagram effect and is closer to the actual combat environment;
2. the semi-physical software radar training simulator can simulate a radar with any frequency band of 0-9 GHz and an instantaneous bandwidth of not more than 1.2 GHz;
3. the semi-physical software radar training simulator can simulate radar of a mechanical scanning system, a phased array scanning system and a phased array staring system.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
FIG. 2 is a schematic diagram illustrating the synthetic effect of ground clutter and target echo modulated by pilot modulation information according to the present invention;
FIG. 3 is a schematic diagram of a phased array radar antenna pattern of the present invention;
FIG. 4 is a schematic diagram illustrating the effect of suppressing interference on ground clutter and targets when the interference enters from the antenna side lobe;
FIG. 5 is a schematic diagram illustrating the effect of suppressing interference on ground clutter and targets when entering from the antenna main lobe;
FIG. 6 is a schematic diagram of a terminal display effect of the semi-physical software radar training simulator with injection type interference according to 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.
Referring to fig. 1 to 6, a method for modulating an interference signal of an injection type interference semi-physical radar simulator includes the following steps:
the method comprises the following steps: setting guiding and thinking information comprising target information f3, clutter information f2, interference information f1 and analog radar information f 0;
step two: the radar training simulator generates target signals VT1 and VT2 … VTM after fundamental frequency extraction according to the preset information and the target information f3 in the step one; FIG. 2 shows the combined effect of the ground clutter VZ1 and the target echo VT 1.
Step three: the radar training simulator generates clutter signals VZ1 and VZ2 … VZN after fundamental frequency extraction according to the scenario information and the clutter information f2 in the step one;
step four: injecting a radio frequency signal A generated by an interference machine, wherein the frequency of the interference signal is 0-9 GHz, and the instantaneous bandwidth is not more than 1.2 GHz;
step five: adjusting working parameters of the microwave integration module according to f0 such as frequency, bandwidth, repetition frequency and the like of the simulated radar, forming interference response of the jammer in the simulated radar system, and performing down-conversion, filtering and extraction to obtain baseband interference signals VG1 and VG2 … VGX;
step six: performing power modulation and orientation modulation on VG1 and VG2 … VGX according to the interference orientation, distance and intensity information f1 of the pilot modulation (as shown in figure 3), and generating interference signals VTG1 and VTG2 … VTGX;
step seven: according to the antenna directional diagram information of the main channel and the auxiliary channel, linearly superposing target signals VT1 and VT2 … VTM, clutter signals VZ1 and VZ2 … VZN, interference signals VTG1 and VTG2 … VTGX to generate main channel simulation data SZ and auxiliary channel simulation data SF;
step eight: side lobe shading processing is carried out on the main channel simulation data SZ and the auxiliary channel simulation data SF to obtain a shaded channel SN;
step nine: radar signal processing is carried out on the SN, and algorithms such as channel correction, pulse compression, super clutter detection, moving target display, constant false alarm detection and the like are included to obtain a detection video SC and a background video SZ;
step ten: performing radar data processing algorithms including point track aggregation, track correlation, track tracking and other algorithms on the SC to obtain a plurality of tracks T;
step eleven: the simulated radar terminal displays the effect of radar under the condition of interference, including track T, detection video SC, background video SZ and the like, as shown in FIG. 6.
Furthermore, in the fourth step of the present invention, the interference signal is a radio frequency signal output by the jammer, and the power and the direction of the interference signal are modulated according to the pilot information, so that the interference signal conforms to the station arrangement effect and the radar directional diagram effect, and is closer to the actual combat environment.
Further, in the second step and the third step of the present invention, the radar training simulator realizes the generation of the radar effect of the simulated mechanical scanning, phased array scanning and phased array staring system through software radio technology, hardware platformization and software parameterization.
Further, in the embodiment of the present invention, the radar training simulator performs power modulation on the digital interference signal according to the scenario information, the station placement position, the working frequency, and the bandwidth information in the step one;
the power modulation formula is:
power1db＝jammer+1md-K-Rdb-Lj。
wherein power1_ db is output after power modulation; jammer is the power of the jammer,
pt is the transmitting power of the jammer, Br is the proportion of the jammer bandwidth falling into the radar bandwidth, and B is the jammer bandwidth; 1md is radar working frequency factor, and 1md is 10 × log10(300/f0), wherein f0 is the radar working frequency in MHz; k is the constant K10 × log10(1.38×42×π2) (ii) a Rdb is the attenuation over distance, 20 × log10(R); and Lj is the one-way propagation loss of the jammer, and is 6 dB.
Further, in the embodiment of the present invention, the radar training simulator performs azimuth modulation on the digital interference signal according to the scenario information, the station placement position, and the antenna pattern of the radar in the step one to generate interference data;
the orientation modulation formula:
power2db＝power1db+Gr_Rad(θ)+Gr J am(θ)
wherein power1dbIs the result of 6 power modulations; gr _ Rad (theta) is the gain of the radar receiving antenna in the theta direction; GrJ am (theta) is the gain of the transmitting antenna of the interference unit in the theta direction; final interference power
The working principle is as follows: when the interference signal modulation method of the injection type interference semi-physical software radar training simulator is used, the radio frequency interference signal of the interference machine is modulated according to the direction and the distance according to the guiding and modulating information, and the interference signal is injected into the radar training simulator containing the clutter and the target, so that the signal characteristics of the interference are consistent with the real situation; the interference signal is modulated based on the virtual station arrangement information, so that the interference signal is consistent with the deployment environment; the capability of constructing the closed-loop confrontation environment of the electronic confrontation equipment and the radar equipment in the loop of a person is achieved, and the requirements of complex radar electronic confrontation training and exercise can be met.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. An interference signal modulation method of an injection type interference semi-physical radar simulator is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: setting guiding and thinking information comprising target information f3, clutter information f2, interference information f1 and analog radar information f 0;
step two: the radar training simulator generates target signals VT1 and VT2 … VTM after fundamental frequency extraction according to the preset information and the target information f3 in the step one;
step three: the radar training simulator generates clutter signals VZ1 and VZ2 … VZN after fundamental frequency extraction according to the scenario information and the clutter information f2 in the step one;
step four: injecting a radio frequency signal A generated by an interference machine, wherein the frequency of the interference signal is 0-9 GHz, and the instantaneous bandwidth is not more than 1.2 GHz;
step five: adjusting working parameters of the microwave integration module according to f0 such as frequency, bandwidth, repetition frequency and the like of the simulated radar, forming interference response of the jammer in the simulated radar system, and performing down-conversion, filtering and extraction to obtain baseband interference signals VG1 and VG2 … VGX;
step six: performing power modulation and orientation modulation on VG1 and VG2 … VGX according to the interference orientation, distance and intensity information f1 of the pilot modulation to generate interference signals VTG1 and VTG2 … VTGX;
step seven: according to the antenna directional diagram information of the main channel and the auxiliary channel, linearly superposing target signals VT1 and VT2 … VTM, clutter signals VZ1 and VZ2 … VZN, interference signals VTG1 and VTG2 … VTGX to generate main channel simulation data SZ and auxiliary channel simulation data SF;
step eight: side lobe shading processing is carried out on the main channel simulation data SZ and the auxiliary channel simulation data SF to obtain a shaded channel SN;
step nine: radar signal processing is carried out on the SN, and algorithms such as channel correction, pulse compression, super clutter detection, moving target display, constant false alarm detection and the like are included to obtain a detection video SC and a background video SZ;
step ten: performing radar data processing algorithms including point track aggregation, track correlation, track tracking and other algorithms on the SC to obtain a plurality of tracks T;
step eleven: and displaying the effect of the radar under the condition of interference on the simulated radar terminal, wherein the effect comprises a track T, a detection video SC and a background video SZ.
2. The method for modulating the interference signal of the injection interference semi-physical radar simulator according to claim 1, wherein the method comprises the following steps: in the fourth step, the interference signal is a radio frequency signal output by the jammer, and the power and the direction of the interference signal are modulated according to the guiding and adjusting information, so that the interference signal accords with the station arrangement effect and the radar directional diagram effect and is closer to the actual combat environment.
3. The method for modulating the interference signal of the injection interference semi-physical radar simulator according to claim 1, wherein the method comprises the following steps: in the second step and the third step, the radar training simulator realizes the generation of the radar effect of the simulated mechanical scanning, phased array scanning and phased array staring system through software radio technology, hardware platformization and software parameterization.
4. The method for modulating the interference signal of the injection interference semi-physical radar simulator according to claim 1, wherein the method comprises the following steps: the radar training simulator modulates the power of the digital interference signal according to the planned information, the station arrangement position, the working frequency and the bandwidth information in the step one;
the power modulation formula is:
power1db＝jammer+lmd-K-Rdb-Lj。
wherein power1_ db is output after power modulation; jammer is the power of the jammer,
pt is the transmitting power of the jammer, Br is the proportion of the jammer bandwidth falling into the radar bandwidth, and B is the jammer bandwidth; lmd is radar working frequency factor, lmd is 10 × log10(300/f0), wherein f0 is the radar working frequency in MHz; k is the constant K10 × log10(1.38×42×π2) (ii) a Rdb is the attenuation over distance, Rdb＝20×log10(R); and Lj is the one-way propagation loss of the jammer, and is 6 dB.
5. The method for modulating the interference signal of the injection interference semi-physical radar simulator according to claim 1, wherein the method comprises the following steps: the radar training simulator carries out azimuth modulation on the digital interference signal according to the planned information, the station arrangement position and the antenna directional diagram of the radar in the step one to generate interference data;
the orientation modulation formula:
power2db＝power1db+Gr_Rad(θ)+Gr_Jam(θ)
wherein power1dbIs the result of 6 power modulations; gr _ Rad (theta) is the gain of the radar receiving antenna in the theta direction; gr _ Jam (theta) is the gain of the transmitting antenna of the interference unit in the theta direction; final interference power of 10power1db/10。
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| CN111624557A (en) * | 2020-06-24 | 2020-09-04 | 中国人民解放军空军预警学院 | Method and system for distributed networking interference |
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