Anti-decoy jamming method for wideband phased array radar based on fractional domain-frequency domain processing

A broadband phased array, fractional domain technology, applied in complex mathematical operations, radio wave measurement systems, instruments, etc., can solve the problems of large algorithm complexity, huge calculation amount, and many filtering weight vector parameters, etc., to achieve higher SINR, The effect of excellent SINR and improved computing efficiency

Active Publication Date: 2021-10-08
ROCKET FORCE UNIV OF ENG
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Problems solved by technology

[0006] The object of the present invention is to provide a broadband phased array radar anti-decoy jamming method of fractional domain-frequency domain joint processing, in order to solve the broadband beamforming air domain filter weight vector parameter in the prior art is numerous, algorithm complexity is very big, calculation problems such as large volume

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  • Anti-decoy jamming method for wideband phased array radar based on fractional domain-frequency domain processing
  • Anti-decoy jamming method for wideband phased array radar based on fractional domain-frequency domain processing
  • Anti-decoy jamming method for wideband phased array radar based on fractional domain-frequency domain processing

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Embodiment 1

[0069] This embodiment proves the effectiveness of the scheme through the simulation verification of the fractional domain anti-jamming algorithm:

[0070] In this embodiment, the array element number of the phased array radar antenna is M =10 one-dimensional uniform linear radar array antenna, the element spacing is set to the half-wavelength of the highest frequency, and the system noise is modeled as a complex Gaussian stochastic process with mean zero and variance one. Radar transmit signal parameters include, signal bandwidth B =100MHZ, pulse width T p =100μs, carrier frequency f c =1200MHZ, sampling frequency f s =320MHZ, pulse repetition interval T r =400μs, range gate N g =4096. In this embodiment, take the direction away from the radar as the forward direction, set a target echo and two broadband LFM interference signals of false targets, and the distance of the real target r 0 =25.75km, speed v =-15m / s, the target direction is θ 0 =10°. In order to ...

Embodiment 2

[0085] In order to fully verify the spatial domain filtering performance of the proposed fractional domain broadband LFM signal, this embodiment uses measured data obtained in a microwave anechoic chamber to verify the effect of the method of the present invention. The experimental equipment includes: an 8-element uniform linear antenna array, a signal transmitter, a reflector, a multi-channel data collector and a data storage array. The experimental system is constructed as follows: Figure 7 As shown, the experimental system is built using the compact field test technology. A signal source and transmitting antenna are arranged in the darkroom to transmit the broadband LFM signal to the reflective surface. The reflective surface converts the received spherical wave into a plane wave, and then the radar Array antenna acquisition, processing and storage.

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Abstract

The invention belongs to the field of radar anti-jamming, and discloses a broadband phased array radar anti-decoy jamming method based on fractional domain-frequency domain processing, comprising: obtaining multiple echo signals and target position information of a phased array radar antenna array; Convert all echo signals to the fractional domain, and obtain the interference-plus-noise covariance matrix and the signal-plus-noise covariance matrix of the fractional domain according to the fractional domain covariance matrix; perform convex optimization to obtain the fractional domain steering vector of the target echo signal, according to The fractional domain steering vector of the target echo signal is used to obtain the beamforming weight vector and generate the beamforming signal; the cutoff frequency is f mu The low-pass filter in the fractional domain performs low-pass filtering on the beamforming signal in the fractional domain to obtain the target echo signal in the fractional domain; and performs the inverse FrFT processing in the fractional domain to obtain the target echo signal in the time domain. The invention uses robust narrowband beamforming and fractional-frequency domain low-pass filtering in the fractional domain to effectively suppress broadband decoy LFM interference signals.

Description

technical field [0001] The invention belongs to the field of radar anti-jamming, in particular to a method for anti-decoy jamming of broadband phased array radar based on fractional domain-frequency domain processing. Background technique [0002] With the continuous development of radar stealth and electromagnetic deception jamming technology, the requirements for radar functions are not limited to target detection and parameter estimation, and the demand for imaging recognition of targets is increasingly urgent. Therefore, the application of broadband signals in the field of radar is becoming more widespread. Radar decoy jamming refers to simulating the echo characteristics of the target, making the radar obtain false target information, making wrong judgments or increasing the error of the radar automatic tracking system. Therefore, decoy jamming signals often have the same signal characteristic parameters as radar transmitted signals, making it difficult for conventiona...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/36G01S7/41G06F17/16G06F17/14
CPCG01S7/36G01S7/41G06F17/14G06F17/16
Inventor 胡昌华杨剑钟都都卢建涂育维余志勇王忠
Owner ROCKET FORCE UNIV OF ENG
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