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Frequency domain based ultralow-sidelobe chaos radar signal generation and digital implementation methods

A radar signal, ultra-low sidelobe technology, used in radio wave measurement systems, instruments, etc., can solve the problems of unsatisfactory effect and high cost

Pending Publication Date: 2013-08-07
CENT FOR SPACE SCI & APPLIED RES
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Problems solved by technology

In order to reduce the sidelobe of the chaotic radar signal, the quantization noise can be reduced by increasing the quantization word length on the hardware, but the cost is relatively high and the effect is not ideal

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  • Frequency domain based ultralow-sidelobe chaos radar signal generation and digital implementation methods
  • Frequency domain based ultralow-sidelobe chaos radar signal generation and digital implementation methods
  • Frequency domain based ultralow-sidelobe chaos radar signal generation and digital implementation methods

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Embodiment Construction

[0051] A frequency-domain-based ultra-low sidelobe chaotic radar signal generation and digital implementation method of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0052] figure 1 As shown, the present invention provides a method for generating ultra-low sidelobe chaotic radar signals based on the frequency domain, and the method includes the following steps:

[0053] Step 1) Generate a sequence of chaotic maps:

[0054] The form of one-dimensional discrete chaotic map is written as f:φ→φ, and the mapping function representation of the one-dimensional discrete chaotic map is written as φ n+1 =g(φ n ), which uses the mapping function to obtain the chaotic mapping sequence Simultaneously let the initial value φ(0)=φ of the one-dimensional discrete chaotic map 0 It is a random variable within the range of values. Since the chaotic map will not change the probability densi...

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Abstract

The invention relates to frequency domain based ultralow-sidelobe chaos radar signal generation and digital implementation methods. The generation method includes the steps: firstly, generating a chaotic mapping sequence; secondly, starting from a frequency domain, enabling frequency domain amplitude of chaos radar signals to be constant, and utilizing the chaotic mapping sequence generated in the first step for frequency modulation of radar signals in a frequency domain form; and thirdly, taking the chaos radar signals generated in the second step as the frequency domain form of the radar signals, and performing inverse Fourier transformation to obtain a frequency domain form of frequency domain based ultralow-sidelobe chaos radar signals. The digital implementation method includes utilizing the frequency domain based ultralow sidelobe chaos radar signals generated by the generation method for quantization and truncation so as to achieve digital implementation of the frequency domain based ultralow-sidelobe chaos radar signals. The methods have the advantages that limitation that the chaos radar signals are high in sidelobe is solved, peak sidelobe ratio is decreased, detectability of dim targets can be enhanced, and the like.

Description

technical field [0001] The invention relates to the field of chaotic radar signal design, in particular to the field of ultra-low sidelobe chaotic radar signal design based on frequency domain by using chaotic mapping in noise radar. Background technique [0002] Noise radar is a radar that uses noise source as the transmission signal or signal modulation form. Due to the random nature of the transmission signal, noise radar has excellent low intercept probability performance and electronic anti-interference ability. Its blur function is an ideal thumbtack type with high range and velocity resolution at the same time. Therefore, as early as the 1960s, the United States and some European countries paid extensive attention to noise radar. However, due to the limitations of the manufacturing process and technical level of electronic components at that time, the research on noise radar was basically in the stage of theoretical analysis. Until the 1980s, with the emergence of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02
Inventor 杨启伦张云华顾翔
Owner CENT FOR SPACE SCI & APPLIED RES
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