AMBIGUITY FUNCTIONS OF DIRECT CHAOTIC RADAR EMPLOYING MICROWAVE CHAOTIC
AMBIGUITY FUNCTIONS OF DIRECT CHAOTIC RADAR EMPLOYING MICROWAVE CHAOTIC
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DOI：
10.2528/pier07072001
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
Zhiguo Shi;Shan Qiao;K. Chen;Wanzhao Cui;Wei Ma;Tao Jiang;L. Ran
中科院分区：
文献类型：
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作者：
Zhiguo Shi;Shan Qiao;K. Chen;Wanzhao Cui;Wei Ma;Tao Jiang;L. Ran
研究了一类直接混沌雷达系统的模糊函数。在该雷达系统中，使用了一个微波混沌科尔皮茨振荡器来产生源信号，该源信号不需要调制就可以直接通过宽带天线传输。该雷达系统的自模糊函数表现出较多的旁瓣，使得模糊检测变得困难。这是因为混沌信号的频谱不是很平坦和平滑，其中有脉动峰。研究了直接雷达系统的互模糊函数，以评估电子对抗系统的性能和“多用户”特性。结果表明，用相同参数、不同时刻或略有不同电路参数的电路产生的混沌信号，可以在该雷达系统中获得较好的ECCM性能。此外，本文还提出了几种可能的方法来重塑来自微波科尔皮茨振荡器的混沌信号的频谱，以提高无歧义检测性能。
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.