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Array element arrangement and emission signal combined optimization method

A technology of transmitting signals and joint optimization, applied in the field of radar imaging, can solve problems affecting the quality of radar correlation imaging, low randomness of radiation field, ignoring internal connections, etc., to improve radar imaging quality, increase randomness, and improve robustness Effect

Pending Publication Date: 2019-12-20
XIDIAN UNIV
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Problems solved by technology

[0004] However, the above two methods only consider the influence of a single factor on the radiation field, that is, the optimization of the arrangement of the surface and the form of the transmitted signal of the array elements is studied in a separate way, ignoring the arrangement of the array elements and the relationship between the array elements. The inherent connection of the transmitted signal waveform makes the randomness of the radiation field not high and the imaging error is large, which affects the quality of radar correlation imaging

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  • Array element arrangement and emission signal combined optimization method
  • Array element arrangement and emission signal combined optimization method
  • Array element arrangement and emission signal combined optimization method

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Embodiment 1

[0049] See figure 1 , figure 1 It is a flow chart of a joint optimization method for array element arrangement and transmitted signal provided by an embodiment of the present invention, including:

[0050] Step 1: Initialize the GA algorithm parameters; wherein, the parameters include the population number Zg, the reproduction algebra Zp, the number of selected individuals S and the number of crossovers C, C=Zg-S;

[0051] Although the GA algorithm (genetic algorithm) probabilistic selection method from parent to offspring can ensure the diversity of population individuals, it may also lose multiple optimal individuals when the number of individuals in the population is small, resulting in population adaptation. The speed does not rise but falls.

[0052] In this embodiment, assume that the number of individuals in the population is Zg, the number of reproduction generations is Zp, and the number of individuals retained in the process from parent to offspring is S, then the ...

Embodiment 2

[0107] The effects of the present invention will be further verified and illustrated through simulation experiments below.

[0108] The radiation field parameters are set as follows: the radar front is a square with a side length of 0.5, the radar transmission signal is a random frequency hopping signal, the imaging plane is divided into 20×20 grids, and the size of each grid is 0.5m×0.5m.

[0109] In this embodiment, the above radar parameters are used, and the condition number of the finally generated reference signal matrix is ​​used as the population fitness evaluation standard to carry out simulation design. The condition number of the reference signal matrix characterizes the uncorrelated degree of its radiation field to a certain extent. The larger the condition number, the smaller the degree of irrelevance, and the smaller the condition number, the greater the degree of irrelevance. The incoherence of the radiation field affects the radar imaging quality, the more inc...

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Abstract

The invention discloses an array element arrangement and emission signal joint optimization method. The method comprises the following steps: initializing GA algorithm parameters including the population number, the maximum multiplication algebra, the selection individual number and the cross individual number; generating a population comprising an array element arrangement chromosome set and an emission signal sequence chromosome set according to the GA algorithm parameters; calculating individual fitness of all individuals of the population, and performing selection operation, crossover operation and mutation operation on the population according to the GA algorithm parameters and the individual fitness to obtain an updated population; and repeatedly updating the population if the genetic algebra of the updated population is determined to be lower than the maximum multiplication algebra. According to the array element arrangement and emission signal combined optimization method provided by the invention, the randomness of a radiation field is improved, and the algorithm effect is improved, so that the radar imaging errors are reduced, and the radar imaging quality is improved.

Description

technical field [0001] The invention belongs to the technical field of radar imaging, and in particular relates to a joint optimization method for array element arrangement and transmission signal. Background technique [0002] Radar correlation imaging is a new staring high-resolution imaging method, relying on multiple independent antenna elements to transmit random signals, forming a space-time two-dimensional random radiation field in space, combining the radiation field formed by the received scattered echo signals with the Pre-stored stochastic radiation fields are correlated to obtain high-resolution inverted images within the gaze area. The radar correlation imaging technology can break through the aperture limitation of the antenna, and compared with the traditional SAR imaging, its resolution is not determined by the Doppler frequency, and high-resolution staring imaging can be achieved without the relative motion between the radar and the target. All-day, all-wea...

Claims

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Application Information

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IPC IPC(8): G01S13/89G06N3/12
CPCG01S13/89G06N3/126Y02D30/70
Inventor 包敏陈冲邢孟道
Owner XIDIAN UNIV
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