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A system and method for generating a randomly truncated linear frequency modulated continuous wave signal

A linear frequency modulation signal and linear frequency modulation technology, applied in the direction of frequency modulation carrier system, modulated carrier system, radio wave measurement system, etc.

Active Publication Date: 2022-01-04
BEIJING RES INST OF TELEMETRY +1
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AI Technical Summary

Problems solved by technology

This method can meet the requirements of most radar systems to a certain extent, but in radar systems with relatively high anti-jamming performance requirements, simply using pulse chirp signals cannot meet the high requirements of anti-jamming performance

Method used

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  • A system and method for generating a randomly truncated linear frequency modulated continuous wave signal
  • A system and method for generating a randomly truncated linear frequency modulated continuous wave signal
  • A system and method for generating a randomly truncated linear frequency modulated continuous wave signal

Examples

Experimental program
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Effect test

Embodiment

[0051] 1) Generate m-sequence code in real time

[0052] The principle of m-sequence code generation is as follows: figure 2 As shown, the specific implementation process is as follows image 3 As shown, according to the input parameter of the number of symbols, the initial value of symbols and m polynomial coefficients, m-sequence codes are generated in real time. The specific method is as follows: According to the required number of symbols, generate the calculation signal comput_start that generates m-sequence codes; generate alternately changing flag signals according to the comput_start signal; generate feedback signals and m-sequence codes when comput_start and flag are valid at the same time. When comput_start is valid and the flag is invalid, the initial value x of the m-sequence code is updated. The final m-sequence code is generated on the falling edge of comput_start.

[0053] 2) Generate m-sequence random truncated pulses in real time

[0054] According to the...

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Abstract

A system and method for generating randomly truncated LFM continuous wave signals. The system includes: an m-sequence code generation module, a truncated pulse generation module, a LFM continuous wave signal generation module, a timing adjustment module and a DAC digital-to-analog conversion module. The generating steps include: 1) generating m-sequence code; 2) generating random truncated pulse and truncated pulse enable according to the symbol value of m-sequence code; 3) generating chirp according to externally input chirp signal and truncated pulse enable A continuous wave signal; 4) superimposing the chirp continuous wave signal with a random truncated pulse to generate a random truncated chirp continuous wave signal. The method of the invention has flexible symbol number, complex signal form and strong anti-interference ability, modular design is beneficial to system integration, and large signal duty ratio is beneficial to improving long-distance detection performance.

Description

technical field [0001] The invention relates to a system and method for generating random truncated linear frequency modulation continuous wave signals, which belong to the field of special radar signal generation and relate to the generation of random truncated linear frequency modulation continuous wave signals. Background technique [0002] In the radar system, the chirp signal is usually used as the main signal form, and anti-jamming is realized by adjusting different signal frequency bands and related parameters. This method can meet the requirements of most radar systems to a certain extent, but in radar systems with relatively high anti-jamming performance requirements, simply using pulse chirp signals cannot meet the high requirements of anti-jamming performance. Contents of the invention [0003] The technical solution problem of the present invention is: overcome the deficiencies in the prior art, propose a kind of generation system and method of random truncated...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/10G01S7/36G01S7/35G01S7/02H04J13/00
CPCH04L27/103G01S7/023G01S7/36G01S7/35H04J13/0025
Inventor 李永丽张佳琪杨润峰张凤梅张振华于勇
Owner BEIJING RES INST OF TELEMETRY
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