Czasopismo | ELEKTRONIKA - KONSTRUKCJE, TECHNOLOGIE, ZASTOSOWANIA | Rocznik 2010 - zeszyt 11

Using multi-frequency coherent signal to measurement of frequency response of narrow-band LF and HF circuits

nr katalogowy: 56011

Coherent (synchronous) detection is applied first of all in cases of very weak signal reception. The presence of a so-called reference signal, synchronous with respect to the received signal carrier is necessary to make it possible to apply coherent detection. Coherent detection can be realized by means of an analogue or digital set-up - the method of realization depends mainly on the frequency range of received signals. If a signal is in the form of a HF carrier, amplitude modulated with a periodic LF signal, a two-stage coherent detection is applied for the reception of such a signal. The first coherent detection (in the HF area) is usually analogue and is performed, because of the unknown phase shift of the HF channel, by means of an I&Q demodulator. Output signals from the I&Q demodulator are subjected to the second coherent detection, also using, because of the unknown phase shift of the LF channel, the quadrature detection. This second detection is currently most often realized in a digital way. The need to use a HF measuring signal modulated simultaneously with many LF signals sometimes occurs in the measuring procedure. The application in such a case of synchronous detection of all modulating LF signals allows high sensitivity of the measuring set-up to be obtained - similar to that obtained in the case of a single modulating signal. Such measuring signals have many advantages. In general the application of synchronous detection for M of modulating signals requires applying M of modulating generators and M of synchronous detectors, utilizing 2xM of amplifiers (I and Q channels) and 2xM of analog-to-digital converters (ADC). The authors proposed the principle of simultaneous homodyne detection of many modulating signals [1, 2, 4 - 9] and designed the multi-channel homodyne receiver, making it possible to measure M signals by means of one M-output generator and one synchronous detector utilizing two amplifiers and two [...]

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