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NFLM signal optimization method and device based on augmented Lagrangian genetic algorithm

A genetic algorithm and signal technology, applied in the field of nonlinear frequency modulation signal optimization method and device, can solve the problems of main lobe width restriction, waste of computing resources and time, reduction of side lobe broadening of main lobe, etc.

Active Publication Date: 2020-08-28
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, the above method inevitably broadens the main lobe while reducing the side lobes, and does not restrict the width of the main lobe, resulting in an inevitable reduction in resolution
In addition, some existing optimization schemes, such as the method of dividing the time-frequency space into multiple grid control points and performing traversal search, often take days or months for an optimization, which wastes a lot of computing resources and time, so the improvement Optimizing algorithm speed is also imminent

Method used

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  • NFLM signal optimization method and device based on augmented Lagrangian genetic algorithm
  • NFLM signal optimization method and device based on augmented Lagrangian genetic algorithm
  • NFLM signal optimization method and device based on augmented Lagrangian genetic algorithm

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Embodiment 1

[0035] Embodiment 1 of the present invention provides an NLFM signal optimization method based on the augmented Lagrangian genetic algorithm, such as figure 1 As shown, the method includes:

[0036] S101, establishing a time-domain function of the NLFM signal based on the Bezier curve;

[0037] In one embodiment, the time-domain function of establishing the NLFM signal based on the Bezier curve includes: establishing the time-frequency relationship of the NLFM signal based on the Bezier curve, and determining the phase function of the NLFM signal according to the time-frequency relationship of the NLFM signal , determining the time-domain function of the NLFM signal according to the phase function of the NLFM signal.

[0038] In one embodiment, the time-frequency relationship of the NLFM signal is established based on the Bezier curve, the phase function of the NLFM signal is determined according to the time-frequency relationship of the NLFM signal, and the NLFM signal is de...

Embodiment 2

[0120] In the embodiment of the present invention, the NLFM signal optimization method based on the augmented Lagrangian genetic algorithm provided in the first embodiment of the present invention is further described, as follows figure 2 As shown, the method includes:

[0121] S201. Using the Bezier curve to describe the time-frequency relationship of the NLFM signal, solving the phase function of the NLFM signal, and then defining the signal time domain function;

[0122] In the Cartesian coordinate system, the time-frequency relationship coordinates of the NLFM signal are defined as (t, f). Suppose the pulse width of the signal is T r , the signal bandwidth is B r , the sampling frequency is f s , then the signal time interval vector is Given n+1 control points in the time-frequency coordinate relationship plane, it is defined as P={(x i ,y i )|i=0,1...,n}, using the Bezier curve to describe the time-frequency relationship of the NLFM signal can be described as:

...

Embodiment 3

[0176] In the embodiment of the present invention, the NLFM signal obtained by the NLFM signal optimization method based on the augmented Lagrangian genetic algorithm provided by the embodiment of the present invention is described in conjunction with the design parameters of the large duration signal commonly used in the specific synthetic aperture radar system.

[0177] Design parameters for large time-width signals include:

[0178] The pulse width is 10us, the bandwidth is 100MHz, and the sampling frequency is 130MHz, wherein, the initialization NLFM signal is generated according to equations (1)-(9) and (15).

[0179]Based on the above-mentioned design parameters, the design includes LFM waveform, Taylor window design waveform, optimized waveform 1 and optimized waveform 2, wherein the optimized waveform 1 and optimized waveform 2 are based on the augmented Lagrangian genetic algorithm provided according to the embodiment of the present invention For the NFLM signal gener...

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Abstract

The embodiment of the invention discloses a NFLM (Non-linear frequency modulation) signal optimization method based on an augmented Lagrange genetic algorithm. The method comprises the following stepsthat: on the basis of a Bessel curve, establishing the time domain function of the NFLM signal; according to the time domain function of the NFLM signal, determining MW (Main-lobe Width) and a PSLR (Peak SideLobe Ratio) in the autocorrelation function performance of the NLFM signal, and on the basis of the MW and the PSLR, establishing an optimal mathematic model; on the basis of the optimal mathematic model, determining the algorithm model of the augmented Lagrange genetic algorithm; on the basis of an initialization function, initializing each NLFM signal in a NLFM signal set to obtain a corresponding initial NLFM signal; and utilizing the algorithm model to carry out continuous iteration on a set initial iteration parameter and the initial NLFM signal until the augmented Lagrange genetic algorithm is subjected to convergence. The embodiment of the invention also discloses a NFLM signal optimization device based on the augmented Lagrange genetic algorithm.

Description

technical field [0001] Embodiments of the present invention relate to the field of radar transmission signals, and relate to, but are not limited to, a non-linear frequency modulation (NLFM) signal optimization method and device based on an augmented Lagrangian genetic algorithm. Background technique [0002] Linear Frequency Modulation (LFM) signals are often used in modern advanced radars, such as Synthetic Aperture Radar (SAR), because of their high-resolution imaging capabilities for targets. Radar uses LFM signals to produce high levels of side lobes. In order to suppress the sidelobe false information generated by the target and maintain the phase information, the LFM signal is usually windowed. However, windowing to suppress side lobes will lead to a decrease in the signal-to-noise ratio (SNR) of the radar system. For example, the existing SAR radar signals such as German Aerospace Agency’s TerraSAR-X and Italy’s Cosmo-SkyMed are windowed, and the system SNR decrease...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/02G01S13/90
CPCG01S7/02
Inventor 金国栋王宇邓云凯龙雅君刘开雨
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI