本文選題：光控相控陣　切入點：波束形成　出處：《電子科技大學》2014年博士論文

【摘要】：光控相控陣天線具有寬帶寬角的技術特點,成為相控陣天線領域的研究熱點。光延遲移相網(wǎng)絡作為相控陣天線波束形成的核心部件,實現(xiàn)了對微波信號在光域的延遲移相和合波,克服了“孔徑效應”和“渡越時間”對帶寬的限制。光延遲移相網(wǎng)絡的技術指標將直接影響相控陣天線空間波束形成的性能,因此,研究寬帶、高精度、多波束的光延遲移相網(wǎng)絡對實現(xiàn)高性能的光控相控陣天線具有重要意義。論文詳細分析研究了光延遲移相網(wǎng)絡的各種拓撲結構和實現(xiàn)方案,針對光控相控陣天線的工程應用,采用磁光開關、單模光纖、光分路器、波分復用器等器件,提出了滿足寬帶、高精度、多波束要求的光延遲移相網(wǎng)絡拓撲結構,完成了實施方案的設計和關鍵技術參數(shù)的分析計算。采用相控陣波束形成理論和統(tǒng)計理論,推導了光延遲移相網(wǎng)絡延遲誤差和幅度誤差與空間波束電平指標之間的理論關系式�；诠鈧鬏旀溌吩肼暲碚�,推導了模擬光收發(fā)模塊噪聲系數(shù)、輸出信噪比、鏈路關鍵光電參數(shù)與空間波束電平之間的理論關系式。對上述理論推導結果進行了仿真研究,仿真結果表明:光延遲移相網(wǎng)絡延遲誤差對空間波束指標劣化起主導作用,幅度誤差僅對副瓣電平影響較為明顯;光載波傳輸鏈路中,束指向誤差均方差與鏈路噪聲系數(shù)的1/2次方成正比,與陣元數(shù)的3/2次方成反比;鏈路中激光器相對強度噪聲、鏈路插入損耗、激光器輸出平均光功率是導致空間波束指標劣化的主要因素,這些參量劣化均會導致波束主瓣指向誤差增大和增益降低,副瓣出現(xiàn)電平升高,其中激光器相對強度噪聲影響最為明顯。當激光器相對強度噪聲低于-140dB/Hz,鏈路插入損耗小于10dB,系統(tǒng)性能較佳。針對光延遲移相網(wǎng)絡延遲時間的精確測量,采用相干長度包絡頂點檢測技術,設計了基于M-Z干涉儀相干零位檢測的光纖長度測量系統(tǒng),測量精度達到亞皮秒量級。同時,研制了高精度光纖切割工藝平臺,實現(xiàn)10μm級切割精度�；谏鲜鰷y量平臺和工藝平臺,完成了高延遲精度的波分復用延遲線和5bit磁光開關延遲線的研制,其中延遲誤差均方差分別達到0.14ps和0.62ps,幅度一致性達到0.13dB和0.32dB。針對16陣元寬帶(2~6GHz)相控陣接收線陣,研制了高精度寬帶多波束光延遲移相網(wǎng)絡。該網(wǎng)絡包含256條延遲鏈路,在空間形成了15個固定波束和1個可變波束,主要技術指標為:固定波束和可變波束無源網(wǎng)絡延遲誤差均方差分別優(yōu)于0.16ps和0.63ps,插入損耗誤差均方差優(yōu)于0.18dB和0.34dB,波束內(nèi)光收發(fā)模塊幅度誤差均方差優(yōu)于0.65dB,相位誤差均方差優(yōu)于1.96°。光延遲移相網(wǎng)絡實現(xiàn)了高精度的延遲時間和幅度一致性,滿足了相控陣天線的應用需求。
[Abstract]:Optical phased array antenna has the characteristics of wide wideband angle and has become a research hotspot in the field of phased array antenna. Optical delay phase shift network is the core component of phased array antenna beamforming. The delay phase shift and wave of microwave signal in optical domain are realized, and the limitation of bandwidth caused by "aperture effect" and "transit time" is overcome. The technical specifications of optical delay phase shift network will directly affect the performance of space beamforming of phased array antenna. Therefore, it is important to study the broadband, high-precision, multi-beam optical delay phase-shift network for the realization of high performance optically controlled phased array antenna. In this paper, various topologies and implementation schemes of the optical delay phase-shift network are analyzed and studied in detail. Aiming at the engineering application of optical phased array antenna, the optical delay phase shift network topology is proposed by using magneto-optic switch, single-mode optical fiber, optical splitter, wavelength division multiplexer and other devices, which meet the requirements of broadband, high-precision and multi-beam. The design of the implementation scheme and the analysis and calculation of the key technical parameters are completed. The phased array beamforming theory and the statistical theory are adopted. Based on the theory of optical transmission link noise, the noise coefficient of analog optical transceiver module and output signal-to-noise ratio (SNR) are derived. The theoretical relationship between the key optoelectronic parameters of the link and the level of the spatial beam is studied by simulation. The simulation results show that the delay error of the optical delay phase shift network plays a leading role in the deterioration of the spatial beam index. In the optical carrier transmission link, the mean square error of the beam pointing error is proportional to the 1 / 2 power of the link noise coefficient, and is inversely proportional to the 3 / 2 power of the array element, and the relative intensity noise of the laser is in the link. Link insertion loss and laser output average optical power are the main factors leading to the deterioration of spatial beam index. These parameters will lead to the increase of beam main lobe pointing error and the decrease of gain, and the increase of sidelobe level. When the relative intensity noise of laser is lower than -140 dB / Hz and the link insertion loss is less than 10 dB, the system performance is better. Based on the coherent length envelope vertex detection technology, a fiber length measurement system based on M-Z interferometer coherent zero position detection is designed. The measuring accuracy is in the order of sub-picosecond. At the same time, a high-precision optical fiber cutting technology platform is developed. Based on the above measuring platform and process platform, the high delay line of wavelength division multiplexing (WDM) and 5bit magneto-optic switch delay line are developed. The RMS of delay error reaches 0.14ps and 0.62psrespectively, and the amplitude consistency reaches 0.13dB and 0.32dB. for the 16 array wideband wideband array receiving line array, a high-precision broadband multi-beam optical delay phase-shifting network is developed. The network consists of 256delay links. There are 15 fixed beams and 1 variable beam in space. The main technical parameters are as follows: the mean variance of delay error of fixed beam and variable beam passive network is better than that of 0.16ps and 0.63 pss. the mean variance of insertion loss error is better than that of 0.18dB and 0.34 dB, the mean variance of amplitude error of optical transceiver module in beam is better than 0.65 dB, and the phase error is wrong. The difference mean square deviation is better than 1.96 擄. The optical delay phase shift network achieves high precision delay time and amplitude consistency. The application requirement of phased array antenna is satisfied.
【學位授予單位】：電子科技大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TN821.8

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相關期刊論文 前1條

1 邱志成;史雙瑾;邱琪;;高精度光纖延遲線的研究[J];光電工程;2009年06期

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本文編號：1657972