Quantitative analysis of break-lock in monopulse receiver phase-locked loop using noise jamming signal

Harikrishna Paik, N. N. Sastry, I. Santiprabha
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Abstract

It is evident that noise jamming is one of the several active jamming techniques employed against tracking radars and missile seekers. The noise jamming mainly aims at completely masking the desired radar signal by the externally injected noise signal. Of several parameters to be considered for the analysis of noise jamming problem, the noise jammer power is one of the most critical parameter. In this paper, emphasis is given for estimation and quantitative analyses of the effectiveness of break-lock in a missile borne phase locked loop (PLL) based monopulse radar receiver using external noise signal. The analyses involve estimating the jamming signal power required to break-lock as a function of radar echo signal power through computer simulation and experimental measurements. The simulation plots representing the receiver PLL output are presented for selected echo signal powers from -14 dBm to -2 dBm. The simulation results are compared and verified with experimental results and it is established that these results are close approximate within 2 dB. It is noted that the measured values of jamming signal power at break-lock using HMC702LP6CE, HMC703LP4E and HMC830LP6GE PLL synthesizers are -19.5 dBm, -18.1 dBm and -17.6 dBm, respectively, while the simulated value is -18.8 dBm for a typical radar echo signal power of -10 dBm. The fairly good and consistent agreement between these results validates the simulation data.
利用噪声干扰信号定量分析单脉冲接收机锁相环的破锁
显然,噪声干扰是针对跟踪雷达和导弹导引头的几种有源干扰技术之一。噪声干扰的主要目的是通过外部注入的噪声信号完全掩盖所需要的雷达信号。在分析噪声干扰问题需要考虑的几个参数中,噪声干扰器功率是最关键的参数之一。本文重点对基于弹载锁相环(PLL)的单脉冲雷达接收机利用外部噪声信号的破锁效果进行了估计和定量分析。分析包括通过计算机仿真和实验测量,估计破锁所需的干扰信号功率与雷达回波信号功率的函数关系。给出了在-14 dBm至-2 dBm范围内所选回波信号功率下的接收机锁相环输出仿真图。将仿真结果与实验结果进行了比较和验证,结果表明仿真结果在2db范围内接近。结果表明,HMC702LP6CE、HMC703LP4E和HMC830LP6GE锁相环合成器在断锁时干扰信号功率的实测值分别为-19.5 dBm、-18.1 dBm和-17.6 dBm,而典型雷达回波信号功率为-10 dBm时的仿真值为-18.8 dBm。结果与仿真数据的一致性较好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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