1999•Ha'erbin gongye daxue xuebaoRequires access

Frequency nonlinearity measurement for linear frequency modulated signal

Meng Xiand

Abstract

The LFM(Linear Frequency Modulated) signal with large bandwidth and long pulse duration generated by a SAW(Surface Audio Wave) device is usuall ed in the pulse compression for and the ISAN(Inverse Synthetic Aperture Radar). Its linearity of frequency modulation has important effects on there systems, so the measurement of linearity of the LFM signal caused by the SAW device becomes a key technique to evaluate this SAW device. The frequency of a signal is linear modulated , then its phase is square modulated . During the modulation time (pulse width), the phase of the signal will change several thousands of 360 degrees, so it is difficult to make the measurement precision limit in several with so large measurement data. This paper has used the net analysis apparatus with high precisionHP8510B (its precision of phase measurement is 0.2 degree) and the signal processing technique to realize the measurement of the nonlinear frequency modulation of LFM signal . and measurement results are given.

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Available abstract

Key concepts: Frequency modulation, Linearity, SIGNAL (programming language), Acoustics, Pulse compression, Pulse-frequency modulation, Analog transmission, Modulation (music)