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PIER PIER B PIER C PIER M PIER Letters
2007-08-01
Ambiguity Functions of Direct Chaotic Radar Employing Microwave Chaotic Colpitts Oscillator
By
Zhi-Guo Shi,

    Professor Zhi-Guo Shi

    Department of Information and Electronic Engineering

    Zhejiang University

    China

    Homepage

Shan Qiao,

    Dr. Shan Qiao

    Department of Information and Electronic Engineering

    Zhejiang University City College

    China

    Homepage

Kang Chen,

    Dr. Kang Chen

    Department of Information and Electronic Engineering

    Zhejiang University

    China

    Homepage

Wan-Zhao Cui,

    Dr. Wan-Zhao Cui

    Xi'an Institute of Space Radio Technology

    China

    Homepage

Wei Ma,

    Dr. Wei Ma

    Xi'an Institute of Space Radio Technology

    China

    Homepage

Tao Jiang,

    Dr. Tao Jiang

    The Electromagnetics Academy at Zhejiang

    Zhejiang University

    China

    Homepage

Li-Xin Ran

    Professor Li-Xin Ran

    The Electromagnetics Academy at Zhejiang University

    Zhejiang Unviersity

    China

    Homepage

, Vol. 77, 1-14, 2007
doi:10.2528/PIER07072001
Abstract
The ambiguity functions of a kind of direct chaotic radar system are investigated. In this radar system, a microwave chaotic Colpitts oscillator is employed to generate the source signal that is directly transmitted through a wideband antenna without modulation. The auto-ambiguity function of this radar system shows many sidelobes which makes the unambiguous detection difficult. It is because the spectrum of the chaotic signal is not very flat and smooth, with pulsation peaks in it. The cross-ambiguity functions of the direct radar system have also been investigated to evaluate the electronic counter countermeasure (ECCM) performance and the "multi-user" characteristic. It is shown that rather excellent ECCM capability can be achieved in this radar system with transmitting chaotic signals generated by circuits with same parameters but at different time or with slightly different circuit parameters. In addition, several possible methods to reshape the spectrum of the chaotic signal from microwave Colpitts oscillators to improve the unambiguous detection performance are suggested at the end of this paper.
Citation
Zhi-Guo Shi, Shan Qiao, Kang Chen, Wan-Zhao Cui, Wei Ma, Tao Jiang, and Li-Xin Ran, "Ambiguity Functions of Direct Chaotic Radar Employing Microwave Chaotic Colpitts Oscillator," , Vol. 77, 1-14, 2007.
doi:10.2528/PIER07072001
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