【作者】 王忠；

【导师】 郭陈江； 阳泽彬； 曹正林； 殷世龙；

【作者基本信息】 西北工业大学 ， 航空工程， 2001， 硕士

【摘要】 近年来，地形跟随/地形回避技术在军事领域中得到长足的发展。最优控制论、飞行控制、数字地图等技术领域的发展和实际应用，成为综合地形跟随/地形回避技术的前沿研究领域，但其较大的技术难度，使目前水平的地形跟随或地形回避技术，仍具有较大的存在价值。本文针对“九五”地形跟随雷达预研课题中的频综系统，在介绍了晶体振荡器、频率调制展宽技术、平衡混频器、微波控制等电路的基础上，就Ku波段非相参捷变频频综系统进行了几个方面的工作： 在系统组成方面：按频段划分，分为频综高频和频综微波两个部分进行分析。频综高频部分有两个振荡器，分别为中频晶振和高中频本振，考虑到带通滤波器制作的难易，中频晶振不能取得太低；通过分析频综系统中的频率关系，权衡系统的稳定性和带通滤波器的抑制度，选取合适的中高频本振。频综微波部分，包括压控本振、上变频器、带通滤波器及微波放大器，频综高频部分输出的高中频信号在微波上变频器中与压控本振信号相混，产生上下边带信号，再由带通滤波器取出所需的边带信号。经微波放大器放大作为发射机的激励源。同时微波压控本振还为接收机微波混频器提供激励信号。 从取得微波信号和完成捷变频作用的角度出发，对微波压控振荡器、微波上变频器、微波带通滤波器等关键部件的设计进行了分析。 设计出的Ku波段非相参捷变频系统适用于不要求动目标显示功能的地形跟随雷达。该系统有较强的抗干扰性能，并具有效率高、耗电省、体积小、重量轻、成本低等特点。将非相参捷变频体制的地形跟随雷达用于低空导航吊舱，无疑是可行的方案。更多还原

【Abstract】 Recently, the development and practical application of the optimal control theory, flight control, and digital map, etc, have more attraction for integrated the terrain following and terrain avoidance (TF/TA) techniques, but in consideration of the complexity of them, the current TF/TA techniques are still valuable and have much great progress in military. In the paper, for frequency synthesizers of TF radar-one of the concept research subjects in the 9th five-year plan, we present the circuits of crystal oscillator (CO), spread spectrum modulation, balanced mixer, microwave control, and so on. The Ku-band frequency synthesizer using incoherent frequency hopping is studied with emphasis. The frequency synthesizer is divided into the HF circuits and the microwave circuits according to the bands. The HF circuits consists of one IF CO and one IF-HF local oscillator (LO). The frequency of IF LO can抰 be selected too low for difficulty of designing the band-pass filter (BPF). Taking the stability of the system and the suppression of the BPF into account, the suitable IF-HF LO frequency is selected by analyzing frequencies relation of the system. Microwave circuit consists of a voltage- controlled LO, an up-converter, a BPF and a microwave amplifier. Outputs of the HF circuit are mixed with signals of the voltage-controlled LO at the up-converter, and the signals of upper side band and lower side band are generated. Desired side-band signals are then extracted via the BPF. The signals are amplified at microwave amplifier and are applied to the transmitter as a drive. Simultaneously, the voltage-controlled LO also provides a drive signal for the microwave mixer of receiver. From the point of getting microwave signals and achieving frequency hopping, this paper discussed the designs of key parts, such as microwave voltage controlled oscillator, microwave up-converter and microwave band-pass filter. The designed incoherent frequency hopping system in Ku-band is suited to the TF radar which doesn抰 require the feature of moving target indication. The system has strong anti-interference, high efficiency, low power, small size, light weight and low cost. It is a feasible scheme that is used to the terrain-following radar of incoherent ? frequency hopping in low sky navigation pod.更多还原