Abstract
The model of a radio pulse stroboscopic converter consisting of a mixer and a narrowband filter tuned to the difference frequency of the carrier signals is considered. We demonstrate that the measurement of the phase structure of the input signals can be made at low frequency by amplitude methods by changing the phase both in the channel of the gating radio pulses and in the low frequency channel. The radio-pulse gating scheme goes into a phase-sensitive mode when the system clock frequency is synchronized with the second harmonic of the difference frequency, however, in this case, a parasitic phase modulation occurs in the converted signal, which does not depend on the transformation coefficient of the spectrum and is determined only by the duty cycle of the input signal. To eliminate parasitic modulation, which distorts the envelope of the output signal of the converter in a phase-sensitive mode, it is proposed to use an auto-shift circuit with a falling “slow” sawtooth voltage when generating gating radio pulses.
Highlights
The study of both the envelope form and the phase structure of the periodic sequence of coherent radio pulses is an important task of radar and pulse reflectometry
Stroboscopic methods of transformation of a time scale are used, which allow matching the frequency range of broadband radio signals with the capabilities of measuring equipment [1]
We study the mode of operation of a radio pulse gating scheme, in which the system clock frequency is synchronized with the second harmonic of the intermediate frequency
Summary
The study of both the envelope form and the phase structure of the periodic sequence of coherent radio pulses is an important task of radar and pulse reflectometry. Stroboscopic methods of transformation of a time scale are used, which allow matching the frequency range of broadband radio signals with the capabilities of measuring equipment [1]. The linear mathematical model is widely used for theoretical analysis of the stroboscopic converter operation [1,3]. Such a model consists of a multiplier of the input and gate signals and a narrow-band filter BPF , which selects one of the spectral components of the conversion results. K 0 k 0 where A (t), A 1(t) are the envelopes of x(t) and a(t), respectively, 0, 1 are carrier frequencies of input x(t) and gating a(t) radio signals, respectively, 0 1 0( 1) , T, T1 are repetition periods of input and gating signals, respectively, N is spectral transformation coefficient (N >> 1), 0 is the envelope delay relative to the high-frequency filling
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