【摘要】：毫米波輻射計(jì)是一種常用的近程被動(dòng)毫米波探測(cè)敏感裝置,該裝置是用于探測(cè)微弱毫米波輻射信號(hào)的高靈敏度接收機(jī),特別適合于對(duì)近程金屬目標(biāo)的探測(cè)與識(shí)別,并廣泛應(yīng)用于高效靈巧彈藥、被動(dòng)成像和交通管制等領(lǐng)域。毫米波輻射計(jì)的性能檢測(cè)和標(biāo)定顯得尤為重要。目前通常采用高塔實(shí)驗(yàn)或機(jī)載實(shí)驗(yàn)的方法,但這些實(shí)驗(yàn)方式均需要復(fù)雜的實(shí)驗(yàn)測(cè)試設(shè)施和大量的實(shí)驗(yàn)經(jīng)費(fèi)。因此,研究和設(shè)計(jì)便捷的毫米波輻射計(jì)實(shí)驗(yàn)測(cè)試系統(tǒng),便于用戶更好地進(jìn)行近程毫米波輻射計(jì)實(shí)驗(yàn)測(cè)試十分重要。詳細(xì)介紹了毫米波輻射計(jì)性能檢測(cè)系統(tǒng)的設(shè)計(jì)組成及工作原理。針對(duì)毫米波輻射計(jì)輸出信號(hào)波形特征,研究了一種改進(jìn)的AdaBoost算法,通過(guò)設(shè)定閾值來(lái)修正分類錯(cuò)誤樣本的權(quán)值,最終在高噪聲環(huán)境下獲得較高的識(shí)別概率。詳細(xì)介紹了系統(tǒng)中信號(hào)處理模塊的硬件和軟件設(shè)計(jì)。硬件設(shè)計(jì)包括整個(gè)模塊的硬件工作原理,DSP芯片、A/D轉(zhuǎn)換器和D/A轉(zhuǎn)換器設(shè)計(jì)、電源、復(fù)位電路、JTAG電路和SCI串口通訊電路等。介紹了模塊的軟件設(shè)計(jì),包括發(fā)送模塊和接收模塊。介紹了無(wú)線傳輸模塊的整體框架,包括Wi-Fi芯片的選擇以及無(wú)線傳輸模塊原理。詳細(xì)介紹了無(wú)線傳輸模塊的軟硬件設(shè)計(jì),主要為Wi-Fi芯片外圍電路的設(shè)計(jì)。并且用LabVIEW設(shè)計(jì)實(shí)現(xiàn)了無(wú)線數(shù)據(jù)采集系統(tǒng),包括前面板和框圖程序的設(shè)計(jì)。最后對(duì)系統(tǒng)進(jìn)行了實(shí)驗(yàn)驗(yàn)證,實(shí)驗(yàn)結(jié)果表明目標(biāo)識(shí)別算法能對(duì)目標(biāo)進(jìn)行分類識(shí)別,SD卡可以實(shí)時(shí)存儲(chǔ)數(shù)據(jù),示波器可以實(shí)時(shí)監(jiān)測(cè)輻射計(jì)數(shù)據(jù),并可以通過(guò)LabVIEW界面實(shí)時(shí)監(jiān)測(cè)和回放實(shí)驗(yàn)數(shù)據(jù)。
[Abstract]:The millimeter-wave radiometer is a common short-range passive millimeter-wave detection sensitive device, which is a high-sensitivity receiver for detecting weak millimeter-wave radiation signals, is particularly suitable for detecting and identifying short-range metal targets, and is widely applied to high-efficiency and smart ammunition, and the like belongs to the field of passive imaging and traffic control and the like The performance detection and calibration of millimeter-wave radiometer are especially important. The method of high tower experiment or on-board experiment is usually used, but these experimental methods require complex experimental testing facilities and a large amount of experimental funds. Therefore, it is very important to study and design the test system of millimeter-wave radiometer, which is convenient for users to carry out the experiment of short-range millimeter-wave radiometer. The design composition and working principle of the millimeter-wave radiometer performance detection system are introduced in detail. An improved AdaBoost algorithm is developed for millimeter-wave radiometer output signal waveform characteristics. By setting the threshold, the weight of the classified error samples is corrected, and the higher recognition probability is obtained in the high-noise environment. The hardware and software design of signal processing module in the system are introduced in detail. The hardware design includes the hardware working principle of the whole module, the DSP chip, the A/ D converter and the D/ A converter design, the power supply, the reset circuit, the JTAG circuit and the SCI serial communication circuit. The software design of the module is introduced, including the sending module and the receiving module. The overall framework of the wireless transmission module, including the selection of the Wi-Fi chip and the principle of the wireless transmission module, is introduced. The hardware and software design of the wireless transmission module is introduced in detail, mainly for the design of the peripheral circuit of the Wi-Fi chip. And the design of the wireless data acquisition system, including the front panel and the block diagram program, is realized by the LabVIEW design. Finally, the experimental results show that the target recognition algorithm can classify and identify the target, and the SD card can store the data in real time. The oscilloscope can monitor the data of the radiometer in real time, and can monitor and play back the experimental data in real time through the interface of LabVIEW.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN015

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