發(fā)布時(shí)間：2019-01-09 06:00

【摘要】：無(wú)論是在民用還是軍用的領(lǐng)域,多普勒測(cè)速系統(tǒng)都得到了非常廣泛的研究以及應(yīng)用。在民用領(lǐng)域可以監(jiān)測(cè)汽車(chē)行駛速度,避免交通事故的發(fā)生;可以引導(dǎo)民航飛機(jī)安全著陸,保證旅客的安全。在軍用領(lǐng)域可以監(jiān)測(cè)敵機(jī)的飛行速度,及時(shí)進(jìn)行預(yù)警;還可以用于武器制導(dǎo),精確的摧毀目標(biāo)等。而隨著科技的進(jìn)步,現(xiàn)代通信系統(tǒng)快速發(fā)展,越來(lái)越多的領(lǐng)域需要進(jìn)行無(wú)線通信,現(xiàn)有的頻率資源已經(jīng)越來(lái)越緊迫,射頻信道也就越來(lái)越珍貴。在通信頻率無(wú)法大規(guī)模擴(kuò)寬的情況下,如何能有效的利用現(xiàn)有的射頻信道就成了一個(gè)重要的課題。因此,對(duì)寬帶小型化無(wú)線收發(fā)系統(tǒng)的研制,具有重要的意義。本文研究了一款兩次變頻的寬帶小型化無(wú)線收發(fā)系統(tǒng)。這個(gè)系統(tǒng)具有小步進(jìn)、大動(dòng)態(tài)范圍等特點(diǎn)。它的接收機(jī)接收頻率覆蓋2GHz~3GHz,輸出中心頻率140MHz;同時(shí)發(fā)射機(jī)輸入頻率為140MHz,輸出頻率為2GHz~3GHz。本文采用了兩次變頻的結(jié)構(gòu),有效地抑制了鏡像頻率,保證了輸出信號(hào)的純凈;通過(guò)對(duì)低噪聲放大器的設(shè)計(jì),保證了整體噪聲達(dá)標(biāo)。本文的難點(diǎn)之一是實(shí)現(xiàn)0.0001Hz的小步進(jìn)。在比較各種小步進(jìn)的方案后,以小型化為準(zhǔn)則,對(duì)現(xiàn)有的方案進(jìn)行改進(jìn),最終利用“鎖相環(huán)+直接數(shù)字頻率合成器+分頻器”實(shí)現(xiàn)了這個(gè)功能。此外,接收動(dòng)態(tài)范圍也是本文的另一個(gè)難點(diǎn)。利用級(jí)聯(lián)自動(dòng)增益放大器的方式,改變傳統(tǒng)的反饋方式,解決了級(jí)聯(lián)自動(dòng)增益放大器常常不能鎖定的問(wèn)題。
[Abstract]:Doppler velocimetry systems have been widely studied and applied in both civil and military fields. In the field of civil use, it can monitor the speed of vehicles, avoid traffic accidents, guide civil aviation aircraft to land safely and ensure the safety of passengers. In the military field, it can monitor the flying speed of the enemy aircraft and carry out early warning in time, and can also be used for weapon guidance, accurate destruction of targets, and so on. With the development of science and technology, the rapid development of modern communication systems, more and more fields need to carry out wireless communications, the existing frequency resources have become more and more urgent, the radio frequency channel is becoming more and more valuable. How to utilize the existing RF channel effectively becomes an important problem when the communication frequency can not be broadened on a large scale. Therefore, it is of great significance for the development of wideband miniaturized wireless transceiver system. In this paper, a two-frequency conversion wideband miniaturized wireless transceiver system is studied. This system has the characteristics of small step, large dynamic range and so on. It has a receiver receiving frequency of 2 GHz, output center frequency of 140 MHz, and transmitter input frequency of 140 MHz and output frequency of 2 GHz / 3 GHz. In this paper, the structure of twice frequency conversion is adopted, which can effectively restrain the mirror frequency and ensure the purity of the output signal, and the overall noise standard is ensured by the design of the low noise amplifier. One of the difficulties of this paper is to realize the small step of 0.0001Hz. After comparing various small step schemes, the existing scheme is improved according to the principle of miniaturization. Finally, this function is realized by using the phase-locked loop direct digital synthesizer divider. In addition, the dynamic range of reception is another difficulty in this paper. The traditional feedback method is changed by using the cascade automatic gain amplifier, which solves the problem that the cascade automatic gain amplifier is often unable to lock.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN859

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本文編號(hào)：2405225