CN107390186B - Method for estimating emission power of suppressed interference signal - Google Patents

Method for estimating emission power of suppressed interference signal Download PDF

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CN107390186B
CN107390186B CN201710548857.0A CN201710548857A CN107390186B CN 107390186 B CN107390186 B CN 107390186B CN 201710548857 A CN201710548857 A CN 201710548857A CN 107390186 B CN107390186 B CN 107390186B
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刘聪锋
杨洁
苏娟
徐满军
贺杏
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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
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Abstract

The method for suppressing the emission power estimation of the interference signal comprises the following steps: the radar wave beam points to a target, a radar transmitter transmits radar signals, a reconnaissance machine intercepts the radar signals, and the transmitting power of the radar signals is estimated; the radar receiver receives a target echo and estimates the power of the target echo; estimating the interference signal power received by the radar receiver when the expected interference is generated; and estimating the transmission power of the interference signal transmitted by the interference machine according to the interference signal power received by the radar receiver. The method of the invention considers the attenuation of the environmental factors to the signal space propagation and reflects the attenuation to the propagation factor in the estimation process of the signal transmitting power, thereby more accurately obtaining the transmitting signal power of the jammer used for suppressing the interference under the effective interference condition.

Description

Method for estimating emission power of suppressed interference signal
Technical Field
The invention belongs to the technical field of signal processing, and particularly relates to an accurate estimation method for signal transmitting power for suppressing interference in electronic countermeasure application.
Background
In the electronic countermeasure process, an interference machine is used for interfering the tracking and guided radar of the other party, the operational efficiency of the radar guided weapon of the other party is reduced, and the capture and maintenance of the advantages of local information become the key for capturing the initiative of the two parties currently in countermeasure. Active jamming is one of the simplest and most common jamming methods in electronic countermeasures, and whether active jamming can be implemented has an important influence on the initiative and the supporting action of the other party in the information countermeasures. At present, the identification of radar active suppression interference is mostly judged by using the signal power, and if the signal power emitted by suppression interference is too high, a target is easily exposed and attacked; when the interference power is larger than the minimum suppression interference power, the emitted redundant energy will form unnecessary energy consumption, and easily affect the own electronic device. Therefore, the accurate control of the emission power of the suppressed interference becomes the basis and guarantee of effective implementation of the active suppressed interference, so that the accurate estimation of the interference power has important significance for the realization of the radar active suppressed interference.
The traditional signal transmission power estimation method for suppressing interference mainly considers that the transmission power of an interference machine in effective interference is estimated according to an effective interference suppression condition under a free space condition. However, the process does not consider the influence of the ground (sea surface) and the propagation medium thereof on the radar wave propagation in the space, which may cause a large error in the calculation of the interference power, and even the calculated interference power may not achieve the expected suppression effect under the condition, thereby affecting the own fighting situation. Moreover, the radar rarely works in near free space conditions, and most of the radars actually working are influenced by the ground (sea surface) and the propagation medium thereof, so that the path loss of signal propagation is a practical problem which must be considered in the accurate estimation of the interference power.
Disclosure of Invention
The invention aims to provide a method which is applied to electronic interference countermeasure and can accurately estimate the transmitting power of a suppressed interference signal.
In order to achieve the purpose, the invention adopts the following technical scheme:
the method for suppressing the emission power estimation of the interference signal comprises the following steps: the radar beam is directed at the target, the radar transmitter transmits a radar signal,
estimating the transmitting power of the radar signal; the reconnaissance aircraft intercepts radar signals and estimates the transmitting power P of the radar signalst：
Figure BDA0001343872540000021
In the formula PrFor the signal power received by scout, RrFor the distance between the scout and the radar, FprIs a propagation factor, G, of a radar signal as it propagates through the space between the radar and the scoutt(θr) For scouting aircraftDirectional gain, G, of radar antenna in the search of radar signalsrLambda is the radar signal wavelength for scout aircraft antenna gain;
estimating target echo power; the radar receiver receives the target echo and estimates the target echo power Prs：
Figure BDA0001343872540000022
In the formula PtFor the transmission power of radar signals, GtAntenna gain when aiming the radar antenna at the target, σ is the radar cross-sectional area of the target, RtDistance between radar and target, FptThe propagation factor of the radar signal in the space propagation between the radar and the target is obtained;
estimating the power range of an interference signal received by a radar receiver; interference signal power P received by radar receiver when expected interference is generatedrjThe range of (A) is as follows:
Figure BDA0001343872540000023
wherein, KjSuppression factor, P, for effective interference at the input of a radar receiverrsFor target echo power,. DELTA.fjFor interfering signal bandwidth,. DELTA.frFor radar receiver bandwidth, PnThe power of the internal thermal noise of the radar receiver is m, and the m is an identification coefficient of an interference machine;
estimating the transmission power of an interference signal transmitted by an interference machine; estimating the transmitting power of the interference signal according to the power range of the interference signal received by the radar receiver:
Figure BDA0001343872540000024
wherein R isjAs the distance between the jammer and the radar, FpjFor the propagation factor, G, of the interference signal as it propagates through the space between the jammer and the radarjInterfering antenna gain, G, for an antenna aligned radar when an interferer is transmitting an interfering signalt(θj) Gain of radar antenna when interference signals are received for radar, gammajLoss coefficients are polarization mismatch of interference signals and radar signals.
More specifically, the propagation factor of the radar signal during the spatial propagation between the radar and the scout
Figure BDA0001343872540000031
In the formula ArIs the path loss of the radar signal when the radar signal is transmitted in the space between the reconnaissance plane and the radar.
More specifically, the propagation factor of a radar signal as it travels through the space between the radar and the target
Figure BDA0001343872540000032
In the formula AtIs the path loss of a signal propagating in space between the radar and the target.
More specifically, the propagation factor of the interfering signal when propagating in the space between the jammer and the radar
Figure BDA0001343872540000033
In the formula AjIs the path loss of the signal propagating in the space between the jammer and the radar.
More specifically, the interference signal power P received by the radar receiver when effective interference is generatedrjHas a minimum value of
Figure BDA0001343872540000034
The interference signal power P transmitted by the jammerjThe minimum value of (d) is:
Figure BDA0001343872540000035
according to the technical scheme, when the transmitting power of the signal for suppressing the interference is estimated, the path loss of radar signal propagation is considered, the radar signal is intercepted by the reconnaissance machine, and the power of the radar transmitting signal is accurately estimated; then, accurately estimating the target echo power received by the radar by using the radar transmitting signal power and the target parameter; then deducing an interference power range required by effective interference suppression according to target echo power received by a radar; and finally, selecting reasonable interference transmitting power according to the estimated interference power range required by effectively suppressing the interference. The method can realize accurate estimation of the emission power of the suppression interference signal, can be applied to avionic countermeasure power, adopts a remote support interference mode, implements active suppression interference on an enemy ground remote early warning radar so as to shield scenes of implementing sudden prevention in our part, and can also be applied to other suppression interference countermeasure fields.
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Fig. 1 is a schematic diagram of a radar interference space.
FIG. 2 is a flow chart of the method of the present invention.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying 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.
In order to accurately estimate the transmission power of the suppressed interference signal, avoid unnecessary energy waste, and reduce the unnecessary influence of the excessive interference signal power on the own electronic device, the present invention adds the influence factor of the path loss of signal propagation when estimating the signal transmission power, and the method of the present invention is described in detail below with reference to fig. 1 and 2, taking a monostatic radar as an example.
The method comprises the following steps: the radar beam is directed at the target, the radar transmitter transmits a radar signal,
s100, estimating the transmitting power of the radar signal; the reconnaissance aircraft intercepts the radar signals and estimates the transmitting power P of the radar transmitter for transmitting the radar signalst；
Figure BDA0001343872540000041
Where λ is the radar signal wavelength, PrFor the signal power received by scout, RrFor the distance between the scout and the radar, FprIs a propagation factor, G, of a radar signal as it propagates through the space between the radar and the scoutrFor scout aerial gain, Gt(θr) Directional gain, theta, of radar antenna for reconnaissance of radar signals by scoutrThe deflection angle of the radar antenna in the direction of the scout plane;
wherein, the wavelength lambda of the radar signal and the signal power P received by the scoutrDistance R between scout and radarrCan be obtained by radar signals intercepted by a scout; fprCalculating according to the environment of signal propagation between the radar and the scout:
Figure BDA0001343872540000042
Arfor the path loss of the signal as it travels in the space between the scout and the radar, ArThe value of (d) is the sum of the environmental composite attenuation and the free space transmission loss, and the unit is dB;
s200, estimating target echo power; the radar receiver receives the target echo and estimates the target echo power P at the radar receiverrs；
Figure BDA0001343872540000043
In the formula PtFor the transmission power of radar signals, RtDistance between radar and target, GtAntenna gain when aiming the radar antenna at the target, σ is the radar cross-sectional area of the target, FptIs a propagation factor of a radar signal during spatial propagation between the radar and the target, FptCalculating according to the environment of signal propagation between the radar and the target:
Figure BDA0001343872540000051
Atfor spatial propagation of signals between radar and targetPath loss of (2); the two-way attenuation of signal propagation needs to be considered in the calculation of the target echo power,
Figure BDA0001343872540000052
the two-way signal attenuation is expressed that the signal transmitted by the radar reaches a target, is reflected by the target and then is transmitted to the radar;
according to the transmitting power P of the radar signaltTarget echo power PrsCan be further expressed as:
Figure BDA0001343872540000053
s300, interference signal power P received by radar receiverrjAn estimation step;
according to the set parameters of the interference signal expected to be generated, according to the effective interference suppression condition and the influence of the bandwidth factor, calculating the interference signal power P received by the radar receiver when the expected interference is generatedrjI.e. the interference signal power P received by the radar receiver when the desired interference is generatedrjThe conditions to be satisfied are as follows:
Figure BDA0001343872540000054
wherein, KjSuppression factor, Δ f, for effective interference at the input of a radar receiverjFor interfering signal bandwidth,. DELTA.frFor radar receiver bandwidth, PrsIs the target echo power, PnThe power of the internal thermal noise of the radar receiver is m, and the m is an identification coefficient of an interference machine;
interference signal power P received by radar receiver when effective interference is realized by interference signalrjCan be further expressed as:
Figure BDA0001343872540000055
i.e. the minimum value of the interference signal power received by the radar receiver when significant interference is generated
Figure BDA0001343872540000056
S400, transmitting power P of interference signal transmitted by interference machinejAn estimation step;
Figure BDA0001343872540000061
wherein R isjAs the distance between the jammer and the radar, FpjFor the propagation factor, G, of the interference signal as it propagates through the space between the jammer and the radarjInterfering antenna gain, G, for an antenna aligned radar when an interferer is transmitting an interfering signalt(θj) For radar antenna gain, theta, when the radar receives interfering signalsjFor the deflection angle, gamma, of the radar antenna in the direction of the jammerjThe loss coefficient of polarization mismatch between the interference signal and the radar signal is usually the loss coefficient of polarization mismatch between the interference signal and the radar signal, the interference signal is circularly polarized, the radar antenna is linearly polarized, and gamma isj＝0.5；FpjAccording to the calculation of the space environment of signal propagation between the jammer and the radar,
Figure BDA0001343872540000062
Ajis the path loss of the signal propagating in the space between the jammer and the radar.
The interference signal power P received by the radar receiver obtained in step S300rjRange of (1), interference signal power P transmitted by the jammerjMinimum value P ofjminCan be further expressed as:
Figure BDA0001343872540000063
i.e. when the power of the interfering signal transmitted by the jammer is greater than PjminEffective interference can be achieved.
The spatial energy relationship among the jammer, the radar and the target, reflected by the interference inequality, is known as follows:
(1) suppressing the interference power needed by a high-power radar, and increasing the equivalent radar power P for the radartGtCan liftThe anti-interference capability is high; for interference, the equivalent interference power P is increasedjGjThe effectiveness of radar suppression can be improved;
(2) the effective interference power P required when the effective reflection area sigma of the shielded target varies in a large rangejIncreases with increasing σ; and sigma is changed in a small range, the required effective interference power PjThis is not the case, since the interference power received by the radar receiver is at least a certain multiple greater than the internal noise power of the radar receiver, i.e. Prj≥mPn；
(3) When side lobe interference is implemented, the deflection angle theta of the radar antenna in the direction of the jammerjLarger antenna gain G of radar in jammer directiont(θj) Smaller, then the required equivalent interference power PjGjIs large;
(4) when main lobe interference is implemented, the deflection angle theta of the radar antenna in the direction of the jammerjSmall antenna gain G of radar in jammer directiont(θj) Larger, equivalent interference power P required at this timejGjIs small; the jammer configuration is more advantageous on the target from the viewpoint of power saving;
(5) pressing coefficient KjThe larger the required equivalent interference power PjGjThe larger;
(6) the minimum radar suppression distance R can be calculated by utilizing a dichotomy methodjPminAccording to the formula Prj/PrsThe maximum exposure distance R of the radar can be calculated by being more than or equal to 0iEmaxIn the exposed region, the radar detects a distance RtLess than RiEmaxThe interference can not cover the echo of the target, so that the target is exposed outside and is easy to be detected by an enemy radar; in the interference ambiguity region, RiEmax≤Rt≤RjPminConsidering the real existence of the interference fuzzy area, the estimation range of the interference exposure area is obviously reduced, and the excessive increase of the power requirement of the interference machine can be avoided to cause unnecessary energy waste; in the pressing zone, Rt≥RjPminInterference signals received by enemy radar can cover target echoesAnd the signal is transmitted to the target, so that the target is not easily found by an enemy radar, and the function of protecting the own target is achieved.
Since the loss of the signal on the propagation path is related to the signal propagation distance, the minimum hold-down distance and the maximum display distance can be calculated by using mathematical methods such as dichotomy, iteration method, newton method and the like.
The invention considers the attenuation of the environmental factors to the signal space propagation and reflects the attenuation to the propagation factor in the estimation process of the signal transmitting power, thereby more accurately obtaining the transmitting signal power of the jammer for suppressing the interference under the effective interference condition. The path loss is considered in the interference signal transmitting power estimation process, and compared with the condition that the path loss is not considered, the effective suppression area range of the radar is enlarged, the interference exposure area range and the interference fuzzy area range are correspondingly reduced, and the influence of the path loss on the interference fuzzy area is not negligible. The invention considers the influence of environmental factors on the radar signal space propagation, so that the estimation of the interference power is more accurate, and meanwhile, the calculation of the propagation factor is increased, so that the generated interference signal has higher precision and is more vivid, and the interference effect and the interference success probability are improved while the interference signal power precision is improved.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (5)

1. A method for suppressing interference signal transmit power estimation, comprising the steps of: the radar beam is directed at the target, the radar transmitter transmits a radar signal,
radar apparatusEstimating the transmitting power of the signal; the reconnaissance aircraft intercepts radar signals and estimates the transmitting power P of the radar signalst：
Figure FDA0002385112270000011
In the formula PrFor the signal power received by scout, RrFor the distance between the scout and the radar, FprIs a propagation factor, G, of a radar signal as it propagates through the space between the radar and the scoutt(θr) Directional gain of radar antenna for reconnaissance of radar signals by scoutrLambda is the radar signal wavelength for scout aircraft antenna gain;
estimating target echo power; the radar receiver receives the target echo and estimates the target echo power Prs：
Figure FDA0002385112270000012
In the formula PtFor the transmission power of radar signals, GtAntenna gain when aiming the radar antenna at the target, σ is the radar cross-sectional area of the target, RtDistance between radar and target, FptThe propagation factor of the radar signal in the space propagation between the radar and the target is obtained;
estimating the power range of an interference signal received by a radar receiver; interference signal power P received by radar receiver when expected interference is generatedrjThe range of (A) is as follows:
Figure FDA0002385112270000013
wherein, KjSuppression factor, P, for effective interference at the input of a radar receiverrsFor target echo power,. DELTA.fjFor interfering signal bandwidth,. DELTA.frFor radar receiver bandwidth, PnThe power of the internal thermal noise of the radar receiver is m, and the m is an identification coefficient of an interference machine;
interference machine transmitterEstimating the transmission power of the transmitted interference signal; estimating the transmission power P of an interference signal from the power range of the interference signal received by a radar receiverj：
Figure FDA0002385112270000021
Wherein R isjAs the distance between the jammer and the radar, FpjFor the propagation factor, G, of the interference signal as it propagates through the space between the jammer and the radarjInterfering antenna gain, G, for an antenna aligned radar when an interferer is transmitting an interfering signalt(θj) Gain of radar antenna when interference signals are received for radar, gammajLoss coefficients are polarization mismatch of interference signals and radar signals.
2. The method of suppressing interference signal transmit power estimation of claim 1, wherein: propagation factor of radar signals during spatial propagation between radar and scout
Figure FDA0002385112270000022
In the formula ArIs the path loss of the radar signal when propagating in the space between the reconnaissance plane and the radar.
3. The method of suppressing interference signal transmit power estimation of claim 1, wherein: propagation factor of radar signal in spatial propagation between radar and target
Figure FDA0002385112270000023
In the formula AtIs the path loss of a signal propagating in space between the radar and the target.
4. The method of suppressing interference signal transmit power estimation of claim 1, wherein: propagation factor of interference signals in spatial propagation between jammers and radar
Figure FDA0002385112270000024
In the formula AjIs the path loss of the signal propagating in the space between the jammer and the radar.
5. The method of suppressing interference signal transmit power estimation according to claim 1 or 2 or 3 or 4, characterized by: interference signal power P received by radar receiver when effective interference is generatedrjHas a minimum value of
Figure FDA0002385112270000025
The interference signal power P transmitted by the jammerjThe minimum value of (d) is:
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