Target Signal-to-Noise Ratio Loss Caused by Doppler Radar Local Oscillator Phase Noise ViPu Information http://www.cqvip.com Vol. 31 No. 6 December 1991 ● Academic Papers and Technical Reports Telecommunications Technology Vo 1. 3 1 6 TEL E∞ M M U NI CAT 1 0N ENGI NEERI NG De c e mb e r 1 9 9l Target SNR loss caused by local oscillator phase noise in Doppler radar 去朱学勇“ Keywords t Doppler radar, frequency stability [ Abstract ] This paper discusses the loss of the moving target signal to receiver thermal noise power ratio caused by local oscillator phase noise, and obtains the calculation formula of the target SNR loss when the local oscillator phase noise is white noise phase modulation and self-noise frequency modulation. I. INTRODUCTION This paper is the target SNR when the local oscillator has phase noise. In engineering, it is generally required that AS NR J <0 . 1 d B . In this paper, the self-noise frequency modulation is used as the frequency spectrum of the moving target echo of Doppler radar. In an ideal case, the spectrum of the moving target echo of Doppler radar is a single spectrum line, and the target signal energy is all within the detection filter bandwidth. When the local oscillator frequency is unstable, That is, when phase noise exists, the target echo generates sidebands due to the modulation of the local oscillator phase noise, causing part of the target signal energy to fall outside the detection filter bandwidth, resulting in target signal mass loss and reducing the ratio of the target signal to the receiver thermal noise power (i.e., the target signal-to-noise ratio). This phenomenon is the effect of local oscillator phase noise on Doppler radar...
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