A.V. Korolev1

1 «JSC All-Russian Scientific Research Institute of Radio Engineering» (Moscow, Russia)
1 teleret@mail.ru

This paper analyzes the effect of the frequency synthesizer phase noise power spectral density (PSD) on the MTI filter’s effectiveness. The dependence of suppression of the synthesizer phase noise on the period of radar pulses was investigated. The suppression was modeled and measured for a Ku band transmitter. The requirements for the level of harmonic spurs in the spectrum at the input of MTI filter are formulated. It is shown that phase noise PSD of elements of the radar transmit/receive path which are used to convert the signal to a carrier frequency in the signal synthesizer and convert the signal from the carrier frequency back to an intermediate frequency in the receiving channel of transmit-receive module, is affected by both by range correlation and suppression in MTI filter. An expression is obtained for calculating the phase noise PSD of a pulsed LFM signal in the first Nyquist zone, considering the phase noise PSD in the higher Nyquist zones. The phase noise PSD depends on the width of the signal spectrum (total deviation) and the period of the LFM pulses. The suppression was modeled in the presence of a harmonic component in the signal spectrum, which showed good agreement with the results of measuring the suppression when the pulse repetition rate changes.

Korolev A.V. Evaluation of LFM signal phase noise spectrum and harmonic components effect on the efficiency of the radar Two-pulse canceller // Nanotechnology: development and applications – XXI century. 2026. V. 18. № 2. P. 18–28. DOI: https://doi.org/10.18127/ j22250980-202602-02

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