Continuous wave chaos phase-modulation radio fuse detection system and demodulation method

A technology of detection system and demodulation method, which is applied in the field of realization of fast digital correlation demodulation algorithm, can solve problems such as small number of sequences, low password strength, and unsatisfactory correlation characteristics, and achieve convenient real-time performance, convenient parameter adjustment, and reduced Effect of Small Fuze Volume

Inactive Publication Date: 2008-09-03
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] Although the pseudo-random code fuze widely researched and applied at present also utilizes the m-sequence or Gold sequence with pseudo-random characteristics as the modulation signal, the correlation characteristics of this pseudo-random code are not very ideal, the number of sequences that can be obtained is small, and the cryptographic strength is low, and Due to the generation method, the length of the sequence period is not easy to make too long

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  • Continuous wave chaos phase-modulation radio fuse detection system and demodulation method
  • Continuous wave chaos phase-modulation radio fuse detection system and demodulation method
  • Continuous wave chaos phase-modulation radio fuse detection system and demodulation method

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[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0028] Such as figure 1 As shown, the continuous wave chaotic phase modulation radio fuze detection system includes a chaotic code generator, a delayer, a radio frequency oscillator, a directional coupler, a phase modulator, a circulator, an antenna, a mixer, an automatic gain control amplifier, and a correlator and signal detection components. The chaotic code generator, the correlator and the signal detection component are FPGA chip circuits, and the chaotic code generator generates chaotic wave signals.

[0029] The chaotic signal used to modulate the signal is actually a chaotic time series. Based on FPGA technology, the width of the generated chaotic time series can be precisely controlled by changing the frequency of the crystal oscillator used, and the rising and falling edges of the waveform are very steep, only about 1ns. figure 2 The chaotic sign...

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Abstract

The invention provides a continuous wave chaos phase modulation firebird detecting system, especially a continuous wave chaos phase modulation firebird detecting system implemented based on the generation of modulation signal of FPGA and the quick digital correlative demodulation arithmetic of signal after modulating. The system comprises chaos code generator, retarder, radio frequency oscillator, directional coupler, phase modulator, circulator, aerial, mixer, automatic gain control amplifier, correlator and signal detecting part. The invention has important application value in aspect of realizing fuze anti-interference. The system not only can make the fuze with very perfect distance, speed resolution and distance measurement, distance measurement accuracy, but also with better anti-capturing performance due to diversity and initial value sensitivity of generating method of chaos signal.

Description

technical field [0001] The invention relates to a radio fuze detection system, in particular to generation of FPGA-based modulated signals in a continuous wave chaotic phase-modulated radio fuze detection system and realization of a fast digital correlation demodulation algorithm for modulated signals. Background technique [0002] With the increasingly complex electromagnetic environment of the modern battlefield, the detection performance and anti-interference ability of the radio fuze directly determine whether the warhead equipped with the radio fuze can fully exert its combat effectiveness. [0003] The anti-interference ability and detection performance of radio fuzes are inseparable from the waveform modulation of the fuze. Driven by the needs of the battlefield environment, the waveform modulation methods of radio fuzes are becoming more and more complex. From the perspective of development trend, radio fuzes are increasingly inclined to use wider bandwidth, higher f...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36H04L27/00
Inventor 黄忠华孙东宁李银林冯清娟
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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