CN117214833A - Multi-false target interference method for airborne self-defense interference - Google Patents
Multi-false target interference method for airborne self-defense interference Download PDFInfo
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- CN117214833A CN117214833A CN202311213149.3A CN202311213149A CN117214833A CN 117214833 A CN117214833 A CN 117214833A CN 202311213149 A CN202311213149 A CN 202311213149A CN 117214833 A CN117214833 A CN 117214833A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005259 measurement Methods 0.000 claims abstract description 5
- 230000002452 interceptive effect Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
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- 230000010287 polarization Effects 0.000 description 1
Abstract
The invention discloses a multi-false target interference method for airborne self-defense interference, which comprises the following steps: (1) Calculating radar signal power Pr reaching the receiver port surface according to the pulse amplitude measurement value PA; (2) Calculating the radar signal power P reaching the receiving antenna port surface according to the radar signal power Pr reaching the receiver port surface and the antenna power G; (3) Inquiring the aircraft RCS data of the incoming wave direction according to the arrival direction of the radar signal to obtain an aircraft RCS value sigma of the incoming wave direction; (4) Calculating the echo power of the airplane according to the RCS data of the arrival direction of the radar signal and the radar signal power P reaching the port surface of the receiving antenna; (5) The multi-decoy interfering signal power is controlled to be equal to or greater than the aircraft target echo power. The power of the interference signal generated by the method is equivalent to the echo power of the airplane, and the adversary radar can not identify and reject false targets through the power difference of the true targets and the false targets, so that the success rate of interference is improved, and the interference efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of radar interference, and particularly relates to a multi-false-target interference method for airborne self-defense interference.
Background
Multiple false target interference based on Digital Radio Frequency Memory (DRFM) technology can accurately copy and store radar signal waveforms, and modulate Doppler frequency, time delay and the like on radar signals to generate high-fidelity deception signals, so that a large number of false targets on radial distance are formed; the radar can be provided with a plurality of false targets with similar characteristics and different distance speeds with the real targets, so that the radar system cannot distinguish the real targets from the false targets, the purpose of cheating the radar is achieved, or at least the difficulty of correctly distinguishing the real targets from the false targets by the radar is increased or the time for identifying the real targets by the radar is delayed.
Modern fighters, and in particular stealth fighters, have smaller RCSs and produce less target echo signal power from radar illumination. However, existing airborne self-defense interference generally adopts maximum power to transmit an interference signal, and the power of the interference signal entering a radar receiver is far greater than the power of a real target echo signal. Under the condition, the radar can easily identify false targets by judging the power difference between the true targets and the false targets so as to reject the false targets, so that the multi-false target interference efficiency of airborne self-defense interference is reduced and even the interference is invalid.
Disclosure of Invention
The invention aims to: aiming at the problems in the prior art, the invention provides a multi-false-target interference method for airborne self-defense interference, which solves the problem that the power of a false target interference signal is far greater than the power of a real target echo signal when an airborne self-defense interference maximum power transmits an interference signal by controlling the multi-false-target interference power to be equal to or slightly greater than the local echo power, so that a real and false target cannot be identified by an enemy radar through power difference.
The technical scheme is as follows: in order to solve the technical problems, the invention provides a multi-false target interference method for airborne self-defense interference, which comprises the following steps:
step 1, calculating radar signal power Pr reaching the interface of a receiver according to a pulse amplitude measurement value PA;
step 2, calculating the radar signal power P reaching the receiving antenna port surface according to the radar signal power Pr and the antenna power G reaching the receiver port surface;
step 3, inquiring the aircraft RCS data of the incoming wave direction according to the arrival direction of the radar signal to obtain an aircraft RCS value sigma of the incoming wave direction;
step 4, calculating the echo power of the airplane according to the RCS data of the arrival direction of the radar signal and the radar signal power P reaching the port surface of the receiving antenna;
and 5, controlling the power of the multi-false target interference signal to be equal to or larger than the target echo power of the airplane.
Further, the specific step of calculating the radar signal power P reaching the receiving antenna port in the step 2 is as follows:
P＝Pr-G
wherein P, pr is the radar signal power reaching the antenna port surface and the receiver port surface, and the unit is dBm; g is the antenna gain in dBi.
Further, the specific steps of calculating the echo power of the aircraft in the step 4 are as follows:
wherein P is tar P is respectively the echo power of the aircraft target and the radar signal power reaching the antenna port surface, and the unit is W;
sigma is the RCS value of the aircraft, and the unit is m 2 ；
G is the antenna gain, without unit;
lambda is the radar signal wavelength in m.
Further, the power of the multi-false target interference signal in the step 5 is 0-5 dB greater than the power of the target echo.
Compared with the prior art, the invention has the advantages that:
according to the invention, the echo power of the local target is calculated, and the multi-false target interference power is accurately controlled to be equivalent to the echo power, so that the problem that the power of the false target interference signal is far greater than the power of the real target echo signal when the airborne self-defense interference maximum power transmits the interference signal in the prior art is solved, the real and false targets cannot be identified by the enemy radar through the power difference, the interference success rate is improved, and the interference efficiency is improved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The invention is further elucidated below in connection with the drawings and the detailed description.
As shown in fig. 1, the present invention provides a multi-decoy interference method for airborne self-defense interference, which specifically comprises the following steps:
the method comprises the following steps:
step 1, calculating radar signal power Pr reaching the interface of a receiver according to a pulse amplitude measurement value PA;
step 2, calculating the radar signal power P reaching the receiving antenna port surface according to the radar signal power Pr and the antenna power G reaching the receiver port surface;
step 3, inquiring the aircraft RCS data of the incoming wave direction according to the arrival direction of the radar signal to obtain an aircraft RCS value sigma of the incoming wave direction;
step 4, calculating the echo power of the airplane according to the RCS data of the arrival direction of the radar signal and the radar signal power P reaching the port surface of the receiving antenna;
and 5, controlling the power of the multi-false target interference signal to be equal to or larger than the target echo power of the airplane.
Further, the specific step of calculating the radar signal power P reaching the receiving antenna port in the step 2 is as follows:
P＝Pr-G
wherein P, pr is the radar signal power reaching the antenna port surface and the receiver port surface, and the unit is dBm; g is the antenna gain in dBi.
Further, the specific steps of calculating the echo power of the aircraft in the step 4 are as follows:
wherein P is tar P is respectively the echo power of the aircraft target and the radar signal power reaching the antenna port surface, and the unit is W;
sigma is the RCS value of the aircraft, and the unit is m 2 ；
G is the antenna gain, without unit;
lambda is the radar signal wavelength in m.
Further, the power of the multi-false target interference signal in the step 5 is 0-5 dB greater than the power of the target echo.
Taking a certain fighter plane as an example:
assuming that the working frequency of the enemy radar is 3GHz, the emission peak power is 200kW, the gain of the emission antenna is 40dB, and the emission signal is a linear frequency modulation signal (frequency modulation bandwidth is 2 MHz).
The aircraft nose normal direction RCS of the aircraft is about 0.1m 2 . The direction-finding system of the airborne electronic warfare receiver is a multi-baseline interferometer direction-finding system, the receiver is digital channelized receiving, and the interference system is a Digital Radio Frequency Memory (DRFM) technology. The gain of the receiving antenna is about 0dBi, and the maximum transmitting power of the jammer is about 100W.
The my aircraft flies along the line of connecting with the enemy radars, when the distance between the two is 150km, the enemy radars find and track the my aircraft, and the main lobe of the enemy radars continuously irradiates the my aircraft; the self-defense interference is implemented on the enemy radar by the airborne electronic warfare equipment, and the interference pattern is smart and multi-false targets.
The flow of generating smart multi-decoy interference is described below:
a) The interference patterns generated by the my are 32 false targets which accord with the real motion rule and are mutually independent;
b) When the distance between the aircraft and the enemy radar is R, the radar signal power reaching the interface of the receiver of the electronic warfare of the aircraft (namely, the pulse amplitude measurement value) is as follows:
wherein P is r Radar signals respectively reaching the mouth surface of the electronic warfare antennaThe power Pt is the radar emission peak power, gt is the radar emission antenna gain, G is the electronic warfare antenna gain, R is the distance between the radar and the electronic warfare equipment, lambda is the radar signal wavelength, and L is the antenna polarization loss and the rest loss.
Through calculation, the power of the radar signal reaching the port surface of the My electronic warfare receiver is about-26 dBm;
c) The gain of the electronic warfare receiving antenna is about 0dBi, so the power reaching the antenna port surface is about-26 dBi;
d) The RCS normal to the nose of the aircraft is about 0.1m 2 ；
e) According to the radar signal power reaching the antenna port surface and the aircraft RCS of the incoming wave direction, the target echo power of the aircraft can be calculated, and the calculation formula is as follows:
wherein P is tar P is respectively the echo power of the aircraft target and the radar signal power reaching the antenna port surface, and the unit is W;
sigma is the RCS value of the aircraft, and the unit is m 2 ；
G is the antenna gain, without unit;
lambda is the radar signal wavelength in m.
The radar echo power of the aircraft is calculated to be about 5dBm;
f) The interfering transmit power is controlled such that the multi-decoy interfering power is approximately 5 dBm-10 dBm.
When the airborne electronic warfare equipment transmits interference with the maximum power, the interference power is 45dB greater than the echo power of the real target, the RCS equivalent to the false target is 45dB greater than the real target, and the enemy radar can easily identify the radar as the false target through the power difference.
The power of the interference signal generated by the method is equivalent to the echo power of the airplane, and the adversary radar can not identify and reject false targets through the power difference of the true targets and the false targets, so that the success rate of interference is improved, and the interference efficiency is improved.
The foregoing is merely exemplary of the present invention and is not intended to limit the present invention. All equivalents and alternatives falling within the spirit of the invention are intended to be included within the scope of the invention. What is not elaborated on the invention belongs to the prior art which is known to the person skilled in the art.
Claims (4)
1. A multi-decoy interference method for airborne self-defense interference, comprising the steps of:
step 1, calculating radar signal power Pr reaching the interface of a receiver according to a pulse amplitude measurement value PA;
step 2, calculating the radar signal power P reaching the receiving antenna port surface according to the radar signal power Pr and the antenna power G reaching the receiver port surface;
step 3, inquiring the aircraft RCS data of the incoming wave direction according to the arrival direction of the radar signal to obtain an aircraft RCS value sigma of the incoming wave direction;
step 4, calculating the echo power of the airplane according to the RCS data of the arrival direction of the radar signal and the radar signal power P reaching the port surface of the receiving antenna;
and 5, controlling the power of the multi-false target interference signal to be equal to or larger than the target echo power of the airplane.
2. The multi-decoy interference method for airborne self-defense interference according to claim 1, wherein the specific step of calculating the radar signal power P reaching the receiving antenna port in the step 2 is as follows:
P＝Pr-G
wherein P, pr is the radar signal power reaching the antenna port surface and the receiver port surface, and the unit is dBm; g is the antenna gain in dBi.
3. The multi-decoy interference method for airborne self-defense interference according to claim 1, wherein the specific step of calculating the echo power of the aircraft in the step 4 is as follows:
wherein P is tar P is respectively the echo power of the aircraft target and the radar signal power reaching the antenna port surface, and the unit is W;
sigma is the RCS value of the aircraft, and the unit is m 2 ；
G is the antenna gain, without unit;
lambda is the radar signal wavelength in m.
4. The multi-decoy interference method for airborne self-defense interference according to claim 1, wherein the power of the multi-decoy interference signal in the step 5 is 0-5 dB greater than the power of the target echo.
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Citations (5)
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| JP2000121723A (en) * | 1998-10-14 | 2000-04-28 | Mitsubishi Electric Corp | Radar interference device |
| CN107422312A (en) * | 2017-07-07 | 2017-12-01 | 西安电子科技大学 | Cheating interference signal transmission power method of estimation |
| CN209182498U (en) * | 2018-11-30 | 2019-07-30 | 南京长峰航天电子科技有限公司 | A kind of active booster of controllable gain RCS |
| CN110133604A (en) * | 2019-05-20 | 2019-08-16 | 电子科技大学 | A kind of airborne defensive application Deceiving interference method based on polynary synthetic technology |
| CN112363124A (en) * | 2020-11-18 | 2021-02-12 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | Power-based simulation radar target simulation method |
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| JP2000121723A (en) * | 1998-10-14 | 2000-04-28 | Mitsubishi Electric Corp | Radar interference device |
| CN107422312A (en) * | 2017-07-07 | 2017-12-01 | 西安电子科技大学 | Cheating interference signal transmission power method of estimation |
| CN209182498U (en) * | 2018-11-30 | 2019-07-30 | 南京长峰航天电子科技有限公司 | A kind of active booster of controllable gain RCS |
| CN110133604A (en) * | 2019-05-20 | 2019-08-16 | 电子科技大学 | A kind of airborne defensive application Deceiving interference method based on polynary synthetic technology |
| CN112363124A (en) * | 2020-11-18 | 2021-02-12 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | Power-based simulation radar target simulation method |
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