CN-122017746-A - Multichannel anti-reconnaissance waveform design method

CN122017746ACN 122017746 ACN122017746 ACN 122017746ACN-122017746-A

Abstract

The invention discloses a multi-channel anti-reconnaissance waveform design method, which relates to the technical field of electronic countermeasure and comprises the steps of constructing a beam synthesis relation between a transmitting signal and an expected radar signal waveform according to the expected radar signal waveform and the expected noise signal waveform, constructing the beam synthesis relation between the transmitting signal and the expected noise signal waveform, uniformly expressing the beam synthesis relation into a matrix form, combining the matrix form to obtain the beam synthesis relation between the transmitting signal and the expected radar signal waveform and the expected noise signal waveform, restraining the expected radar signal and the expected noise signal according to a directional diagram, enabling the expected radar signal and the expected noise signal not to interfere with each other, constructing an optimization problem, solving the optimization problem, obtaining the weight of the expected radar signal and the weight of the expected noise signal, multiplying the weight of the expected radar signal and the expected radar signal, multiplying the weight of the noise signal and the expected noise signal, and obtaining the transmitting signal of an array element. The invention can improve the anti-reconnaissance capability.

Inventors

LIU YONGJUN
HAN YIMO
DONG XIAOYANG
LIAO GUISHENG
ZHANG HAORAN
ZENG CAO
TANG HAO

Assignees

西安电子科技大学

Dates

Publication Date: 20260512
Application Date: 20260206

Claims (10)

1. The multichannel anti-reconnaissance waveform design method is characterized by comprising the following steps of: Constructing a beam forming relation between a transmitting signal and an expected radar signal waveform according to the expected radar signal waveform and the expected noise signal waveform, and constructing a beam forming relation between the transmitting signal and the expected noise signal waveform; Uniformly expressing a beam forming relation between the transmitting signal and the expected radar signal waveform and a beam forming relation between the transmitting signal and the expected noise signal waveform into a matrix form, and combining to obtain the beam forming relation between the transmitting signal and the expected radar signal waveform and the expected noise signal waveform; according to the directional diagram constraint, the expected radar signal and the expected noise signal are not interfered with each other, and an optimization problem is built; solving the optimization problem to obtain the weight of the expected radar signal and the weight of the expected noise signal; Multiplying the weight of the expected radar signal with the expected radar signal, and multiplying the weight of the noise signal with the expected noise signal to obtain a transmitting signal of an array element, so that the transmitting signal forms a main lobe in the radar direction and forms a notch in the direction of a reconnaissance receiver of the other party.
2. The multi-channel anti-scout waveform design method of claim 1, wherein, according to a desired radar signal waveform, a beam-forming relationship between the transmit signal and the desired radar signal waveform is expressed as: ; Wherein, the Representing the wavelength of the carrier frequency signal, Representing a set of angles within the main lobe of the radar direction, Representing the desired radar signal waveform, The number of the transmitting array elements is indicated, Indicating the index of the transmitting array element, Representing the spacing of the transmitting array elements, Representing the first of a set of angles within the main lobe of the radar direction The angle of the two-dimensional space is set to be the same, A variable of the time is represented and, Representing the transmit signal loaded on the transmit array element.
3. The multi-channel anti-scout waveform design method of claim 2, wherein, according to a desired noise signal waveform, a beam-forming relationship between the transmit signal and the desired noise signal waveform is expressed as: ; Wherein, the Representing the wavelength of the carrier frequency signal, Represent the first A collection of captured direction angles, Representing the desired noise signal waveform, Represent the first A particular angle of the set of intercepted direction angles, An index representing a set of intercepted direction angles, Representing the total number of sets of intercepted direction angles.
4. The multi-channel anti-scout waveform design method of claim 3, wherein a beam forming relationship between the transmit signal and the desired radar signal waveform in a matrix form is expressed as: ; ; ; Wherein, the Representation of A signal matrix of dimensions is provided, Representation of The desired radar signal of the dimension is, The transpose is represented by the number, Represents the conjugate transpose of the object, Representing the units of an imaginary number, Representing the emission array at Steering vector in direction.
5. The multi-channel anti-scout waveform design method of claim 4, wherein a beam forming relationship between the transmit signal and the desired noise signal waveform in a matrix form is expressed as: ; ; ; Wherein, the Representation of A signal matrix of dimensions is provided, Representation of The desired noise signal of the dimension is calculated, Representing the emission array at Steering vector in direction.
6. The multi-channel anti-scout waveform design method of claim 5, wherein a beam-forming relationship between the transmit signal and the desired radar signal waveform and the desired noise signal waveform is expressed as: ; ; ; Wherein, the Representing a set of desired radar signals and desired noise signals, Representing a particular angle in the set of 1 st intercepted direction angles, Representing the 1 st set of intercepted direction angles, Represent the first A particular angle of the set of intercepted direction angles, Represent the first A collection of captured direction angles, Representing a steering matrix formed by stacking a plurality of directional steering vectors.
7. The multi-channel anti-scout waveform design method according to claim 1, wherein the optimization problem is constructed by forming a main lobe with the expected radar signal weight in a radar expected direction, forming a notch with the expected radar signal weight in a receiver direction of the opposite scout, forming a notch with the expected noise signal weight in a main lobe direction, and forming a main lobe with the expected noise signal weight in the receiver direction of the opposite scout as a pattern constraint.
8. The multi-channel anti-scout waveform design method of claim 7, wherein the optimization problem is expressed as: ; ; Wherein, the Representing the weight of the desired radar signal, Representing the weight of the desired noise signal, Representation of The desired radar signal of the dimension is, Representation of The desired noise signal of the dimension is calculated, The transpose is represented by the number, Represents the conjugate transpose of the object, Representing a set of angles within the main lobe of the radar direction, Representing the first of a set of angles within the main lobe of the radar direction The angle of the two-dimensional space is set to be the same, Represent the first A collection of captured direction angles, Represent the first A particular angle of the set of intercepted direction angles, Represent the first A particular angle of the set of intercepted direction angles, Represent the first A collection of captured direction angles, Representing the array steering vector, Representing the total number of sets of intercepted direction angles, Indicating the desired depth of the energy notch in the direction of the receiver of the reconnaissance of the other party, Representing the Frobenius norm square.
9. The method of claim 8, wherein the weights of the desired radar signals are based on a set of weights Expressed as: ; Wherein, the Representing a steering matrix formed by stacking a plurality of directional steering vectors, A constrained response vector representing the desired radar signal; Weights of the desired noise signal Expressed as: ; Wherein, the A constrained response vector representing the desired noise signal.
10. The multi-channel anti-scout waveform design method of claim 9, characterized in that the array element transmits signals Expressed as: ; Wherein, the Representing the portion of the radar signal, Representing the noise fraction.

Description

Multichannel anti-reconnaissance waveform design method Technical Field The invention belongs to the technical field of electronic countermeasure, and particularly relates to a multichannel anti-reconnaissance waveform design method. Background With the rapid development of electronic information technology and signal processing disciplines, the electronic countermeasure capability such as signal interception and the like is greatly improved. With the increasing intensity of attack and defense countermeasures, anti-radar technology research is greatly developed for self safety, a complete electronic attack system is formed, radar detection is more difficult, particularly, a counterpart reconnaissance receiver has strong interception capability, radar signals can be intercepted and sorted, corresponding parameters of radar emission signals are extracted from the sorted radar signals, important information of my radar is obtained, targeted attack measures are adopted, and under the condition, the research of waveforms with good anti-reconnaissance performance becomes urgent demands of modern electronic countermeasures. For an STFT broadband reconnaissance receiver, liu Jiang and the like in paper 'low interception waveform sequence design based on iterative quadratic optimization algorithm' (electronic and information journal, 2024,46 (05): 2048-2056) of national defense science and technology university, a constant envelope waveform design method based on iterative quadratic optimization is provided, the power interception probability is reduced by minimizing the energy peak value of a time-frequency domain sub-band, and the low interception performance and the autocorrelation performance are balanced by using a Pareto weight. The method for designing the segmented LFM modulation random waveform is proposed in the paper 'segmented LFM modulation random waveform anti-reconnaissance design' (radar science and technology, 2015,13 (06): 577-586+591) by Sun Zhiyong et al of the release army electronic engineering college, pulse segmentation is carried out, and then inter-segment LFM phase modulation is carried out under a random noise background, so that the full pulse presents noise-like characteristics on a time domain and a frequency domain, and a reconnaissance receiver is difficult to identify. The radar itself uses the known inter-segment modulation parameters to realize normal target detection through frequency domain inter-segment matching or time domain extraction matching. However, the above methods do not fully utilize the degree of freedom of space dimension brought by the multi-channel array antenna, and only start from the time-frequency characteristic of a single waveform, and the anti-reconnaissance means is relatively single. Therefore, there is a need to provide a multi-channel anti-scout waveform design method to overcome the drawbacks of the prior art. Disclosure of Invention In order to solve the problems in the prior art, the invention provides a multichannel anti-reconnaissance waveform design method. The technical problems to be solved by the invention are realized by the following technical scheme: The invention provides a multichannel anti-reconnaissance waveform design method, which comprises the following steps: Constructing a beam synthesis relation between a transmitting signal and an expected radar signal waveform and constructing a beam synthesis relation between the transmitting signal and the expected noise signal waveform according to the expected radar signal waveform and the expected noise signal waveform; Uniformly expressing a beam forming relation between a transmitting signal and an expected radar signal waveform and a beam forming relation between the transmitting signal and an expected noise signal waveform into a matrix form, and combining to obtain the beam forming relation between the transmitting signal and the expected radar signal waveform and the expected noise signal waveform; according to the directional diagram constraint, the expected radar signal and the expected noise signal are not interfered with each other, and an optimization problem is built; Solving the optimization problem to obtain the weight of the expected radar signal and the weight of the expected noise signal; Multiplying the weight of the expected radar signal with the expected radar signal, and multiplying the weight of the noise signal with the expected noise signal to obtain the transmitting signal of the array element, so that the transmitting signal forms a main lobe in the radar direction and forms a notch in the direction of the opposite reconnaissance receiver. The invention has the beneficial effects that: According to the multichannel anti-reconnaissance waveform design method provided by the invention, the energy of the transmitted signal is restrained by the constraint condition, on the premise of meeting the direction constraint, the waste of non-energy is avoided, the radar transm