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An Efficient Method of Computation for Jammer to Radar Signal Ratio in Monopulse Receivers with Higher Order Loop Harmonics

Harikrishna Paik 1, N. N. Sastry 1, 2, and I. SantiPrabha 1, 2
1. V R Siddhartha Engg College, Vijayawada, India
2. J N T University, Kakinada, India
Abstract—Monopulse radar receivers are the most advanced tracking receivers which often employ phase locked loop (PLL) for coherent detection of the received echo signal to become jam resistance and clutter rejection. In this paper, the loop error in the monopulse receiver is characterized analytically taking several higher order harmonics of input signal phase into account. The effects of these harmonics in breaking the frequency lock in the receiver are studied. The phasor diagram is used as an index to determine input signal phase for the given voltage controlled oscillator (VCO) phase and loop phase error at different values of frequency separation between radar echo signal and interference signal. This allows in computing additional phase error and jammer to radar echo signal amplitude (J/S) ratio required for jamming the receiver. The result shows that for the given phase error, the receiver requires large J/S ratio for break-lock when several higher order harmonics are taken into account. It is also shown that the error results due to higher order harmonics is positive and linear. Thus, the additional J/S ratio required for break-lock can be predicted from the error when fundamental harmonics is considered alone. This reduces the complex computation of J/S ratio required for break-lock when higher order harmonics are considered in the loop analysis. The analysis of the loop taking higher order harmonics into account is carried out for typical loop damping ratio of 0.707 and 1.0.
 
Index Terms—monopulse receiver, loop phase error, phasor diagram, radar echo, tracking receivers

Cite: Harikrishna Paik, N. N. Sastry, and I. SantiPrabha, "An Efficient Method of Computation for Jammer to Radar Signal Ratio in Monopulse Receivers with Higher Order Loop Harmonics," International Journal of Electronics and Electrical Engineering, Vol. 3, No. 2, pp. 100-104, April 2015. doi: 10.12720/ijeee.3.2.100-104
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