【摘要】：隨著無線通信技術的發(fā)展,電子對抗技術也迅猛發(fā)展起來,而無源定位技術憑借自身不輻射電磁波的“靜默”特點,以及作用距離遠、抗干擾能力強等優(yōu)勢,成為當今電子對抗領域研究的熱點問題之一。作為無源定位中的關鍵技術,測向交叉定位算法一直以來是定位方法研究的重要內容,該算法通過獲得兩個截獲點的地理位置和目標輻射源的方位角來演算出目標的二維坐標。針對目標輻射源不定時輻射信號以及多徑干擾等因素導致的定位不準確問題,本文提出了一種測向定位與幾何圓心聯立的新算法,并對該算法進行了理論分析,最后通過北斗導航系統進行實驗驗證,結果表明該算法在無源定位中具有有效性。為了開發(fā)完整無源定位系統,本文在提出新的定位算法后,開發(fā)設計了一套超寬帶接收機前端,實現了對輻射源信號的超寬帶接收。該接收機前端的接收頻率范圍為0.6GHz-2.7GHz,采用超外差式結構,主要是由低噪聲放大器、混頻器、超寬帶頻率源與濾波器所構成,其中超寬帶頻率源為該接收機的主要組成部分。該超寬帶頻率源在電壓控制下可輸出0.8GHz～3GHz的掃頻信號,通過將掃頻信號作為接收機的本振輸入,可使接收機在接收0.6GHz～2.7GHz射頻信號時,穩(wěn)定輸出200MHz～300MHz的中頻信號。在完成超寬帶頻率源以及接收機前端整體設計后,對整個超寬帶射頻前端進行加工與測試。測試結果表明,該接收機前端增益大于7.5dB,靈敏度優(yōu)于-82.5dBm,噪聲系數小于4dB,動態(tài)范圍大于90dB,滿足了超寬帶接收機系統的設計指標。
[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，

本文編號：2481414