Group delay modulation based ultra-low side lobe chaotic radar signal generation and achievement method

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

Active Publication Date: 2013-09-18
NAT SPACE SCI CENT CAS
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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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  • Group delay modulation based ultra-low side lobe chaotic radar signal generation and achievement method
  • Group delay modulation based ultra-low side lobe chaotic radar signal generation and achievement method
  • Group delay modulation based ultra-low side lobe chaotic radar signal generation and achievement method

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Embodiment Construction

[0052] A method for generating and implementing an ultra-low sidelobe chaotic radar signal based on group delay modulation in the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0053] figure 1 As shown, the present invention provides a method for generating ultra-low sidelobe chaotic radar signals based on group delay modulation, and the method includes the following steps:

[0054] Step 1) Generate a sequence of chaotic maps:

[0055] 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 {φ 0 ,φ 1 ...,φ n}, and at the same time let the initial value of the one-dimensional discrete chaotic map φ(0)=φ 0 It is a random variable within the range of values. Since the chaotic map will not chan...

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Abstract

The invention relates to a group delay modulation based ultra-low side lobe chaotic radar signal generation method which includes steps of (1) generating a chaotic mapping sequence; (2) leading the frequency domain amplitude of chaotic radar signals to be a constant starting from the frequency domain, and performing group delay modulation for the radar signals by using the chaotic mapping sequence generated in the step (1) to obtain the frequency domain format of the group delay modulation based chaotic radar signals; and (3) performing inverse fourier transformation on the frequency domain format of the chaotic radar signals generated in the step (2) to obtain the time domain format of the group delay modulation based ultra-low side lobe chaotic radar signals. The invention further provides a group delay modulation based ultra-low side lobe chaotic radar signal achievement method. The group delay modulation based ultra-low side lobe chaotic radar signal generation and achievement method eliminate the limit of high chaotic radar signal side lobes and reduce the peak value side lobe ratio; and can enhance the detectability of weak targets, and have strong anti-jamming capability and low intercept probability characteristics.

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 group delay modulation 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 emergenc...

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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 NAT SPACE SCI CENT CAS
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