基于北斗及地面侦探系统的目标定位技术研究
发布时间：2019-05-20 05:59
【摘要】：随着无线通信技术的发展,电子对抗技术也迅猛发展起来,而无源定位技术凭借自身不辐射电磁波的“静默”特点,以及作用距离远、抗干扰能力强等优势,成为当今电子对抗领域研究的热点问题之一。作为无源定位中的关键技术,测向交叉定位算法一直以来是定位方法研究的重要内容,该算法通过获得两个截获点的地理位置和目标辐射源的方位角来演算出目标的二维坐标。针对目标辐射源不定时辐射信号以及多径干扰等因素导致的定位不准确问题,本文提出了一种测向定位与几何圆心联立的新算法,并对该算法进行了理论分析,最后通过北斗导航系统进行实验验证,结果表明该算法在无源定位中具有有效性。为了开发完整无源定位系统,本文在提出新的定位算法后,开发设计了一套超宽带接收机前端,实现了对辐射源信号的超宽带接收。该接收机前端的接收频率范围为0.6GHz-2.7GHz,采用超外差式结构,主要是由低噪声放大器、混频器、超宽带频率源与滤波器所构成,其中超宽带频率源为该接收机的主要组成部分。该超宽带频率源在电压控制下可输出0.8GHz～3GHz的扫频信号,通过将扫频信号作为接收机的本振输入,可使接收机在接收0.6GHz～2.7GHz射频信号时,稳定输出200MHz～300MHz的中频信号。在完成超宽带频率源以及接收机前端整体设计后,对整个超宽带射频前端进行加工与测试。测试结果表明,该接收机前端增益大于7.5dB,灵敏度优于-82.5dBm,噪声系数小于4dB,动态范围大于90dB,满足了超宽带接收机系统的设计指标。
[Abstract]:With the development of wireless communication technology, electronic countermeasures technology has also developed rapidly, and passive location technology has the advantages of not radiating electromagnetic waves, such as "silence", long action distance, strong anti-interference ability and so on. It has become one of the hot issues in the field of electronic countermeasures. As the key technology in passive location, direction finding cross location algorithm has always been an important part of the research of location method. The algorithm calculates the two-dimensional coordinates of the target by obtaining the geographical position of two intercepted points and the azimuth angle of the target radiation source. In order to solve the problem of inaccurate location caused by irregular radiation signal of target radiation source and multi-path interference, a new algorithm of direction finding and geometric center is proposed in this paper, and the algorithm is analyzed theoretically. Finally, the experimental results of Beidou navigation system show that the algorithm is effective in passive location. In order to develop a complete passive positioning system, a set of ultra-broadband receiver front-end is developed and designed after a new positioning algorithm is proposed, and the ultra-broadband reception of radiation source signal is realized. The receiving frequency range of the front end of the receiver is 0.6 GHz 鈮，
本文编号：2481414
[Abstract]:With the development of wireless communication technology, electronic countermeasures technology has also developed rapidly, and passive location technology has the advantages of not radiating electromagnetic waves, such as "silence", long action distance, strong anti-interference ability and so on. It has become one of the hot issues in the field of electronic countermeasures. As the key technology in passive location, direction finding cross location algorithm has always been an important part of the research of location method. The algorithm calculates the two-dimensional coordinates of the target by obtaining the geographical position of two intercepted points and the azimuth angle of the target radiation source. In order to solve the problem of inaccurate location caused by irregular radiation signal of target radiation source and multi-path interference, a new algorithm of direction finding and geometric center is proposed in this paper, and the algorithm is analyzed theoretically. Finally, the experimental results of Beidou navigation system show that the algorithm is effective in passive location. In order to develop a complete passive positioning system, a set of ultra-broadband receiver front-end is developed and designed after a new positioning algorithm is proposed, and the ultra-broadband reception of radiation source signal is realized. The receiving frequency range of the front end of the receiver is 0.6 GHz 鈮，
本文编号：2481414
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