摘 要

　　　無(wú)線電測(cè)向即是根據(jù)無(wú)線電波在空氣中傳播的特點(diǎn)——直線傳播，利用無(wú)線電測(cè)向機(jī)來(lái)判斷出發(fā)射機(jī)的位置的過(guò)程，航海、航空的導(dǎo)航系統(tǒng)，都是依靠電子技術(shù)的無(wú)線電測(cè)向原理。
　　　無(wú)線電測(cè)向接收機(jī)的電路程式和外形結(jié)構(gòu)等種類繁多，但不論在任何頻段上工作或任何型式的測(cè)向機(jī)，它的組成都可以大致分為測(cè)向天線、收信機(jī)和指示器三部分。測(cè)向天線可以將在空間傳播的電磁波能轉(zhuǎn)化為高頻電能輸送到接收機(jī)，利用磁性天線與環(huán)形天線的方向性可以確定無(wú)線電臺(tái)的方向。測(cè)向接收機(jī)主要由放大器、檢波器、變頻器等部分組成。該部分可對(duì)測(cè)向天線送來(lái)的感應(yīng)電勢(shì)進(jìn)行放大、解調(diào)等各種處理，使天線信號(hào)變成指示器所需要的信號(hào)，用以判斷電臺(tái)方向。
　　　
關(guān)鍵詞：無(wú)線電測(cè)向；接收機(jī)；天線方向性






















Abstract

　　　The wireless measure is a process of judging the position of the shoot machine by making use of the wireless measure machine, according to the characteristic of the spread of the electric wave in the air---the straight line dissemination. The navigation system of the voyage, aviation, all depends on this principle.
　　The wireless measure receiver has various electric circuit programs and the shape structure. However, no matter which pattern it works in and no matter which kind of machine it is, usually it consists of direction-measure antenna，receiver machine and indicator. The direction-measure antenna can transfer the electric magnetic wave which spreads in the space into the electric power of high frequency, and transport to the receiver. It makes use of the magnetism antenna and the wreath form antenna directive and can make sure the direction of the radio station. Mainly the direction-measure is composed of enlarger, detector, and frequency-change machine. This part can enlarge and adjust the electricity from the direction-measure antenna, making the antenna signal become the signal that the indicator needs, judging the direction of the broadcasting station
Keywords: The wireless direction-measure, Receive , the directive ness of the antenna