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Real-time phased array signal distortion correction method based on interference suppression

A technology of signal distortion and real-time correction, which is applied in the field of phased array radar, can solve the problems of undistorted signal correction, difficult practical application, and no application value, etc., to achieve good real-time effect

Active Publication Date: 2014-02-26
成都市国科微电科技合伙企业(有限合伙)
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  • Abstract
  • Description
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Problems solved by technology

However, in the environment of external changes, the interference signal may appear at any time, so the received signal will also change with time, so that the received data may change greatly between two short-lived adjacent weight vector update moments, so the output It is of great practical significance to provide real-time estimation and correction of the amplitude and phase of the signal
[0004] Many existing signal estimation methods study the correction of amplitude and phase errors. Among them, some signal estimation methods need to limit the specific phased array antenna array form. Once such methods change the phased array antenna array form, the performance of this type of method It is no longer effective and robust; some signal estimation methods have the problem of a large amount of calculation, which is not easy to implement in practical applications, or has no practical application value; and some signal estimation methods only consider the phase difference and ignore the amplitude term. When there is constantly changing interference outside, this kind of method cannot effectively correct the distorted signal in real time, and still cannot complete the accurate estimation of the target signal

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  • Real-time phased array signal distortion correction method based on interference suppression
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  • Real-time phased array signal distortion correction method based on interference suppression

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Embodiment 1

[0046] Aiming at the problem that the channel amplitude and phase errors between the antenna array elements lead to the distortion of the antenna output signal during the data receiving process of the phased array radar receiving antenna, the present invention estimates the steering vector of the target signal in real time based on the accurate estimation of the target signal by The amplitude and phase difference of the output signal caused by the antenna channel amplitude and phase error is effectively corrected, breaking through the limitations of the existing technology that cannot be applied to the changing external interference environment, and making up for the poor real-time performance and poor accuracy in the error correction process Defects.

[0047] The present invention is a real-time correction method for phased array signal distortion based on interference suppression, see figure 1 , the signal distortion real-time correction process includes the following steps:...

Embodiment 2

[0067] The real-time correction method of phased array signal distortion based on interference suppression is the same as that in Embodiment 1,

[0068] The construction method of the secondary correction weight vector described in step 5b) of the present invention is carried out according to the following formula:

[0069] w opt_t+Δt =ΔBw t+Δt e -jΔε

[0070] Among them, w opt_t+Δt Indicates the weight vector after secondary correction at time t+Δt; ΔB indicates the amplitude ratio between two adjacent weight vector update moments; Δε indicates the phase difference between two adjacent weight vector update moments; w t+Δt Indicates the updated weight vector at time t+Δt.

[0071] Since at two adjacent weight vector update moments, when the signal energy corresponding to the previous update moment is relatively large, only the correction in step 5a) cannot completely correct the output distorted signal caused by the channel error of the phased array antenna The amplitude...

Embodiment 3

[0073] The real-time correction method of phased array signal distortion based on interference suppression is the same as that in Embodiment 1-2,

[0074] refer to figure 1 , this example describes the technical solution of the present invention in detail from the perspective of engineering implementation as follows.

[0075] Step 1. Establish a phased array antenna signal model and obtain received data;

[0076] For a phased array antenna whose number of elements is N, select the reference array elements and establish an XOY rectangular coordinate system to obtain received data including radar targets, interference and random noise. Assuming that the received signal contains a target signal and several interference signals, the amplitude and phase errors of the receiving antenna include amplitude gain and phase error. The far-field narrowband signal arrives at the array antenna in the form of parallel waves, and the antenna records the recorded signal at each moment in the ...

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Abstract

The invention discloses a real-time phased array signal distortion correction method based on interference suppression. Distortion of estimation on a steering vector of an unknown radar target echo in actual engineering is the result of an amplitude-phase error between channels of a phased array receiving antenna, and the output of the radar target echo can be distorted. According to the real-time phased array signal distortion correction method disclosed by the invention, the steering vector of the radar target echo is precisely estimated, and an amplitude and phase difference between two adjacent weight vector updating moments of a phased array output signal is obtained in real time; therefore, real-time and effective correction is implemented according to the difference; according to the two adjacent weight vector updating moments, if the signal energy corresponding to the later updating moment is higher, secondary correction needs to be executed. The real-time phased array signal distortion correction method can be implemented on any feature-structure-based direction estimation array antenna; the effect of real-time and precision correction for the distortion of a target output signal, which is caused by the amplitude-phase error and change interference between the channels of the receiving antenna, is achieved under a low signal to noise ratio. Theoretical analysis and an experiment result show that a real-time, precision and stable correction effect can be achieved, and the real-time phased array signal distortion correction method is suitable for actual engineering practice.

Description

technical field [0001] The invention belongs to the technical field of phased array radar, and mainly relates to a real-time correction method for phased array signal distortion based on interference suppression, in particular to a real-time correction method for phased array signal distortion based on interference suppression, which is used for phased array radar The distortion of the received signal is corrected in real time. Background technique [0002] Compared with the traditional mechanical scanning radar, the advantages of higher reliability, stronger anti-interference ability, and lower anti-interception rate make phased array radar widely used. However, the amplitude and phase error between channels is an important problem in phased array antennas. In practice, a slight disturbance of the amplitude and phase between channels can lead to a large deviation in the estimation of the echo steering vector of the unknown radar target, and finally lead to the output signal...

Claims

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Application Information

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IPC IPC(8): G01S7/40
CPCG01S7/023G01S7/40G01S2013/0245
Inventor 李亚超孟自强邓欢全英汇邢孟道
Owner 成都市国科微电科技合伙企业(有限合伙)
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