I.A. Grigoryev

This paper introduces the results of LO phase noise impact research on tactical and dynamic coherent doppler radar performance. These results provide possible dynamic range values, which are limited by the local oscillator phase noise conditions in receiver instantaneous bandwidth. Model has developed for describing echo phase noise impact on radar performance in such modes as, tracking the group of moving objects with different speeds, different target ranges, different pulse repetition frequencies. Paper also introduces the unique approach which are using to get estimated values of LO phase noise correlation and residual phase noise in dependence of target range in receiver. This approach allows to detect frequency offsets range where the phase noise could be non-correlated or correlated in a small behavior. It gives the possibility for developer to optimize phase noise performance in this frequency offset range and choose appropriate frequency synthesizer scheme. Some of them has been introduced in previous papers [3, 4]. Simulation results indicates the following trend, which shows that the range increasing leads to correlation factor decreasing and degradation of phase noise in the receiver. It also shows that the range increasing leads to degradation of phase noise at small frequency offsets from the carrier. The final part of paper contains description of simulation results of phase noise impact on the radar velocity resolution. Results includes the receiver dynamic range estimation in the detection process of one moving target in the presence of the another target with different velocities and different range. Simulation results shows up that with increasing range, velocity resolution is going to decrease because of highest phase noise quantities at the small frequency offsets from carrier. In order to get necessary results, the paper uses phase noise data of existing local oscillator module, which development and optimization approaches has been introduced and analyzed in previous papers [3, 4].