【摘要】：隨著無線通信技術(shù)的發(fā)展,電子對(duì)抗技術(shù)也迅猛發(fā)展起來,而無源定位技術(shù)憑借自身不輻射電磁波的“靜默”特點(diǎn),以及作用距離遠(yuǎn)、抗干擾能力強(qiáng)等優(yōu)勢(shì),成為當(dāng)今電子對(duì)抗領(lǐng)域研究的熱點(diǎn)問題之一。作為無源定位中的關(guān)鍵技術(shù),測(cè)向交叉定位算法一直以來是定位方法研究的重要內(nèi)容,該算法通過獲得兩個(gè)截獲點(diǎn)的地理位置和目標(biāo)輻射源的方位角來演算出目標(biāo)的二維坐標(biāo)。針對(duì)目標(biāo)輻射源不定時(shí)輻射信號(hào)以及多徑干擾等因素導(dǎo)致的定位不準(zhǔn)確問題,本文提出了一種測(cè)向定位與幾何圓心聯(lián)立的新算法,并對(duì)該算法進(jìn)行了理論分析,最后通過北斗導(dǎo)航系統(tǒng)進(jìn)行實(shí)驗(yàn)驗(yàn)證,結(jié)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(tǒng),本文在提出新的定位算法后,開發(fā)設(shè)計(jì)了一套超寬帶接收機(jī)前端,實(shí)現(xiàn)了對(duì)輻射源信號(hào)的超寬帶接收。該接收機(jī)前端的接收頻率范圍為0.6GHz-2.7GHz,采用超外差式結(jié)構(gòu),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(gòu)成,其中超寬帶頻率源為該接收機(jī)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(hào),通過將掃頻信號(hào)作為接收機(jī)的本振輸入,可使接收機(jī)在接收0.6GHz～2.7GHz射頻信號(hào)時(shí),穩(wěn)定輸出200MHz～300MHz的中頻信號(hào)。在完成超寬帶頻率源以及接收機(jī)前端整體設(shè)計(jì)后,對(duì)整個(gè)超寬帶射頻前端進(jìn)行加工與測(cè)試。測(cè)試結(jié)果表明,該接收機(jī)前端增益大于7.5dB,靈敏度優(yōu)于-82.5dBm,噪聲系數(shù)小于4dB,動(dòng)態(tài)范圍大于90dB,滿足了超寬帶接收機(jī)系統(tǒng)的設(shè)計(jì)指標(biāo)。
[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(hào)：2481414