E.M. Makarychev – Post-graduate Student, 

Moscow Institute of Physics and Technology (State University); 

Junior Research Scientist, 

PJSC «Radiofizika» (Moscow)

E-mail: makarychev@phystech.edu

I.A. Grigoriev – Head of Sector,  PJSC «Radiofizika» (Moscow)

E-mail: iv.grigoryev@gmail.com

D.S. Ochkov – Ph.D.(Eng.), Head of Research Division, 

PJSC «Radiofizika» (Moscow)

E-mail: d-ochkov@mail.ru

This paper contains estimation of the additive phase fluctuations impact on the phase noise power spectral density of the radar receiver output signal.

Phase noise power spectral density of the radar receiver output signal was calculated for a simplified model of the radar. Fluctuations of the target, propagation medium, phase fluctuations of the signal generated at the intermediate frequency and jitter of the signal processing unit are not considered in this model. The analysis was performed both for a model, that contains only the noise of the local oscillator, and for a model that takes into account the additive noise of other elements of the transmit-receive paths. A phase noise power distribution model with characteristics close to the characteristics of real C-band amplifiers with a low level of additive phase noise, as well as an estimate of the additive phase noise of the PLL loop elements  were used for evaluation the additive phase noise of the transceiver path. 

It was shown that with decreasing range, the contribution of the additive noise of the elements of the transceiver path may exceed the contribution of the phase noise of the local oscillator in a radar design scheme with a common master oscillator. In the case of radars with separate master oscillators for receive and transmit, the local oscillator noise is not attenuated at low frequencies and the spectral power density of the phase fluctuations of the local oscillator signal remains the determining factor for the phase noise power spectral density of the radar receiver output signal.

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