雷达线性调频多目标信号源的设计

【作者】 涂智明；

【导师】 刘中； 李治铭；

【作者基本信息】 南京理工大学 ， 电子与通信工程， 2006， 硕士

【摘要】 本文首先针对靶场测量的多日标环境的新要求，阐述了某新型雷达由于采用脉冲压缩技术而具有了一个波束内跟踪多目标的能力。但是该雷达没有线性调频模拟信号，使得不管在平时的分机的调机、设备维护和故障排除中，还是在雷达系统多目标跟踪能力和跟踪可靠性上都难以达到预想的目的。针对这种情况，设计了线性调频多目标信号源。 雷达在兼容单载频体制的前提下，采用了线性调频的脉压体制的工作原理和过程。发射机发射线性调频信号脉冲宽度为25μs，接收到宽脉冲信号压缩成0.3μs的窄脉冲信号后再进行信号处理，既提高了发射机的平均功率，提高了反射式作用距离，又获得了较高的时间-带宽积和良好的距离分辨力，为目标特性测量提供了强有力的技术支持。 线性调频的多目标信号源主要是由弹道产生器、距离延时电路、高频信号源，幅度、方位、俯仰调制器等几个部分组成。单载频模拟信号和线性调频模拟信号，经过功率合成器，一同送入馈线前端，经过接收机的高频系统、中视频系统，就形成了多目标回波。而这些信号由于频率不同，在两路接收机内得到了区分，同时又采用了测距机统一的定时脉冲定时，所以全机可以同步，能够给出正确的距离和误差信号，所以能驱动天线进行正常跟踪，这样就模拟了动态的多目标环境。更多还原

【Abstract】 According to the shooting range’s measuring requirements of the multi-targets environment , this paper illustrates the new radar possesses the ability of tracking multiple targets in a bunch of wave which has applied the pulse_compressed technology. Because the radar dosen’t provide the linear-frequency-modulation’s analog signals. It can’t meet the anticipated result during debugging the radar , mending equipment and eliminating malfunction , and the ability of tracking multi-targets of the radar . So we design the linear-frequency-modulation’s multi-target signal source .The radar containing the single carrier frequency applies the pulse-compressed system . The transmitter transmits linear-frequency-modulation’s signals that is equal to 25us . It compresses the received wide pulse signals to 0、 3us narrow pulse signals , then the signal is processed . The above processes are not only improve the average power of the transmittor and the reflecting operating range , but also gain higher time-bandwidth accumulation and better range resolving power , provide efficient technology support to the target characteristic measuring .The multi-target signal source of the linear-frequency modulation is composed of the missile-contrail forming implement , range delaying-time circuit , high frequency signal source and the modulator of amplitude , azimuth , elevation . The analog signals of the single carrier frequency and the linear-frequency modulation , being together sent to the antenna’s forepart by the power combiner and then coming by the HF system , IF and VF system , create the multi-target respondent wave . Since different-frequency singals are differentiated in two-circuited receiver , and the adopts the ranger’s united time-pulse timing , the whole radar can achieve synchronization and offer the accurate range and error signals, drives the antenna to tracking normally, Accordingly , the dynamic multi-target environment is simulated by above processes .更多还原