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Design Method of Low Sidelobe Weighting Coefficients with Fixed Mainlobe Width for Stepped Frequency Signal

A technology of main lobe width and weighting coefficient, which is applied in the design field of low side lobe weighting coefficient, can solve the problems of uncontrollable main lobe broadening, unknown reduction amount, and reduced resolution, etc., and achieve the effect of improving side lobe suppression.

Active Publication Date: 2019-07-19
SHANGHAI RADIO EQUIP RES INST
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Problems solved by technology

However, these windowing methods focus on obtaining a high main-side lobe ratio, and the side lobes after windowing are suppressed, but the output main lobe has different degrees of broadening, and the degree of main lobe broadening is uncontrollable, resulting in a decrease in resolution. and the reduction is unknown

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  • Design Method of Low Sidelobe Weighting Coefficients with Fixed Mainlobe Width for Stepped Frequency Signal
  • Design Method of Low Sidelobe Weighting Coefficients with Fixed Mainlobe Width for Stepped Frequency Signal
  • Design Method of Low Sidelobe Weighting Coefficients with Fixed Mainlobe Width for Stepped Frequency Signal

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Embodiment Construction

[0035] The following combination Figure 1 to Figure 6 , to describe preferred embodiments of the present invention in detail.

[0036] Such as figure 1 As shown, the method for designing the low sidelobe weighting coefficients of the fixed mainlobe width of the stepped frequency signal of the present invention comprises the following steps:

[0037] S1. Setting the constrained main lobe width of the stepped frequency signal;

[0038] S2. Using the distance autocorrelation function, the maximum side lobe minimization constraint of the stepped frequency signal is transformed into a convex optimization problem;

[0039] S3, using convex optimization to solve the weighting coefficient;

[0040] S4. Perform frequency-domain windowing on the echo baseband data of the stepped frequency signal, and perform an inverse Fourier transform (IFFT) to obtain a one-dimensional high-resolution range profile with low side lobes after the main lobe width is fixed.

[0041] In the above-ment...

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Abstract

The invention relates to a low sidelobe weighting factor design method for a step-frequency signal in a fixed mainlobe width. The method comprises steps: S1, the constrained mainlobe width of the step-frequency signal is set; S2, a distance autocorrelation function is used for converting the maximum sidelobe minimum constraint condition for the step-frequency signal to a convex optimization problem; S3, the convex optimization is used for solution of a weighting factor; and S4, frequency domain windowing is carried out on echo baseband data of the step-frequency signal, inverse Fourier transform is carried out, and a low-sidelobe one-dimension high-resolution distance image after the fixed mainlobe width is solved. The sidelobe suppression problem of the step-frequency signals is improved, the method is also applicable to a sidelobe suppression problem for the step-frequency signals in a fixed resolution condition, and influences on target signals by clutter sidelobe in a strong clutter interference environment can be reduced.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a design method of a low side lobe weighting coefficient with a fixed main lobe width of a step frequency signal. Background technique [0002] In the prior art, for high-resolution waveform signals, such as chirp signals, polyphase code signals, stepped frequency signals, etc., the inherent defect is that the output after passing through the matched filter has a relatively high distance sidelobe. In a multi-target environment, the output sidelobe of the strong target echo is likely to confuse or cover the main peak of the weak target echo, thus affecting the detection and resolution of weak targets. In order to improve the ability to distinguish targets, it is necessary to use side lobe suppression or weighting techniques. [0003] In the process of matching the signal or synthesizing the high-resolution range image with the stepped frequency signal,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 刘俊豪黄啸魏飞鸣
Owner SHANGHAI RADIO EQUIP RES INST
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