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Phase coding sequence design method based on optimization minimization framework

A technology of optimization, minimization and sequence design, which is applied in the direction of instruments, electrical components, electromagnetic wave transmission systems, etc., can solve problems such as not considering the influence of ideal phase encoding signals, and there is no design method for multi-phase encoding signals, so as to achieve good engineering application capabilities Effect

Pending Publication Date: 2022-04-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, most of these methods are based on waveform design and optimization under the ideal condition of no distortion, without considering the influence of the distortion factors of the actual system on the ideal phase encoding signal, and there is no multi-phase encoding signal under the condition of spectral amplitude and phase distortion. design method
[0004] In summary, there is currently a lack of a design method for polyphase encoded signals under spectral distortion conditions

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  • Phase coding sequence design method based on optimization minimization framework
  • Phase coding sequence design method based on optimization minimization framework
  • Phase coding sequence design method based on optimization minimization framework

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example 2

[0121] Simulation example 2, assuming sequence length N=32, randomly generating 32-bit polyphase encoding sequence, the expression of spectrum amplitude and phase distortion vector Γ is in is a uniformly distributed random quantity in the [0,2π) interval. The initial signal input to the MM-DISL optimization module is the randomly generated polyphase encoded signal x (0) =Γ⊙x.

[0122] According to the aforementioned steps, the code length N=32 and the polyphase coded signal x of spectral amplitude and phase distortion (0) Input the MM-DISL module, perform iterative optimization after initialization, and output the optimized multi-phase encoded signal x after iteration (l) . Separately count the initial signal x of the input module (0) and the iteratively optimized signal x (l) DISL value, the results are shown in Table 2 below:

[0123] Table 2 DISL results before and after optimization of the MM-DISL module under the condition of spectrum amplitude and phase distorti...

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Abstract

The invention discloses a phase coding sequence design method based on an optimization minimization framework, and the method comprises the steps: 1, building a multi-phase coding signal frequency spectrum amplitude phase distortion model, and generating a multi-phase coding signal under a distortion condition through the model; 2, establishing a performance evaluation criterion DISL of the multi-phase coded signal under the condition of frequency spectrum amplitude-phase distortion; 3, establishing an optimization criterion of a multi-phase coded signal under a distortion condition, and designing an iterative optimization module MM-DISL based on an optimization minimization framework; 4, inputting the multi-phase coded signal with the frequency spectrum amplitude phase distortion generated in the step 1 into an MM-DISL module for iterative optimization, and outputting to obtain the multi-phase coded signal with the optimal performance under the current distortion condition; according to the method, the multi-phase coded signal with the optimal performance under the current condition can be designed and optimized aiming at various environments with frequency spectrum amplitude-phase distortion.

Description

technical field [0001] The invention belongs to the technical field of radar waveform design, and in particular relates to a phase encoding sequence design method based on an optimization and minimization framework. Background technique [0002] Modern radars employ pulse-compressed waveforms to obtain sufficient target detection energy and the required range resolution. In order to avoid shielding small targets in strong target side lobes and reduce the interference of multipath related clutter or distributed clutter, it is required that the pulse compression waveform side lobes be as low as possible. At present, the linear frequency modulation signal is commonly used in radar systems. This kind of signal has a high sidelobe level. In engineering applications, it is necessary to reduce the sidelobe by adding a window function, but it will cause a loss in signal-to-noise ratio. Compared with chirp signals, phase-encoded signals have a lower level of aperiodic autocorrelatio...

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Application Information

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IPC IPC(8): H04B10/556G01S7/483G01S7/484
Inventor 宋媛媛任伟蒋睿超刘泉华曾涛龙腾
Owner BEIJING INSTITUTE OF TECHNOLOGYGY