本文關(guān)鍵詞：步進頻雷達射頻對消技術(shù)研究　出處：《電子科技大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 連續(xù)波雷達 脈沖雷達 直接耦合信號 射頻對消

【摘要】：雷達根據(jù)其工作時的波形類型可以分為:脈沖雷達(PR)和連續(xù)波雷達(CW)。連續(xù)波雷達相比于脈沖雷達具有小型化,低工作電壓,高可靠性,高距離分辨率以及不存在距離盲區(qū)等一系列優(yōu)點。但是連續(xù)波雷達具有一個最大的缺陷就是發(fā)射信號泄漏,從發(fā)射機直接耦合到接收機的信號相較于目標回波信號要大很多,當(dāng)雷達需要探測遠距離目標時,根據(jù)雷達方程就需要增大雷達的發(fā)射功率,從發(fā)射機直接耦合到接收機的信號就有可能淹沒目標回波信號甚至是燒毀接收機,這是連續(xù)波雷達不可避免的一個問題。本文的主要工作就是研究步進頻連續(xù)波雷達射頻對消技術(shù)的工作機理和實現(xiàn)。論文主要包括以下幾方面。首先,分析了連續(xù)波雷達和脈沖雷達的工作機制以及各自的優(yōu)缺點,連續(xù)波雷達的工作機制導(dǎo)致直接耦合信號是其主要的缺陷,是限制連續(xù)波雷達性能參數(shù)和應(yīng)用的重要因素,只有解決了直接耦合信號的干擾問題,連續(xù)波雷達才能應(yīng)用在更多的場合中。經(jīng)過對比各種對消方案的優(yōu)缺點,最后決定采用射頻對消的方案。其次,經(jīng)過理論推導(dǎo),得到實現(xiàn)對消的條件,并完成了整個對消過程中的誤差分析。然后,選擇合適的器件和電路,完成頻率源,發(fā)射模塊,接收模塊的設(shè)計以及版圖繪制。完成整個射頻對消模塊的設(shè)計以及版圖繪制。最后,各個模塊經(jīng)過組裝與調(diào)試,完成測試工作,分析測試得到的數(shù)據(jù),對方案進行了驗證。測試結(jié)果表明:整個射頻對消系統(tǒng)工作在點頻模式下對消比在40dB以上,在掃頻模式下,在400MHz帶寬內(nèi),實現(xiàn)了對消比在30dB以上。
[Abstract]:Radar can be divided into pulse radar (PRP) and continuous wave radar (CWN) according to its waveform types. Compared with pulse radar, continuous wave radar has miniaturization, low working voltage and high reliability. There are a series of advantages such as high range resolution and the absence of range blind area. But continuous wave radar has one of the biggest defects is the emission signal leakage. The signal coupled directly from transmitter to receiver is much larger than the target echo signal. When radar needs to detect long-range target, it is necessary to increase the transmitting power of radar according to the radar equation. The signal directly coupled to the receiver from the transmitter may flood the target echo signal or even burn the receiver. This is an inevitable problem of continuous wave radar. The main work of this paper is to study the work mechanism and implementation of radio frequency cancellation technology of step frequency continuous wave radar. This paper mainly includes the following aspects. The working mechanism of continuous wave radar and pulse radar and their respective advantages and disadvantages are analyzed. The direct coupling signal caused by the working mechanism of continuous wave radar is the main defect. It is an important factor to limit the performance parameters and applications of CW radar. Only by solving the interference problem of direct coupled signal can CWR be applied in more situations. The advantages and disadvantages of various cancellation schemes are compared. Finally, it is decided to adopt the scheme of RF cancellation. Secondly, through theoretical derivation, the conditions of realizing cancellation are obtained, and the error analysis in the whole cancellation process is completed. Then, the appropriate devices and circuits are selected. Complete the frequency source, transmission module, receive module design and layout drawing. Complete the design of the entire RF cancellation module and layout drawing. Finally, each module after assembly and debugging, complete the test work. The test results show that the cancellation ratio of the whole radio frequency cancellation system is more than 40 dB in the point frequency mode, and the cancellation ratio is more than 40 dB in the sweep mode. In the 400 MHz bandwidth, the cancellation ratio is more than 30 dB.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN95

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