I.A. Salnyy1

1 JSC «Taganrog Scientific Research Institute of Communications» (Taganrog, Russia)

In receivers of instantaneous frequency measurement (IFM), it is required to ensure high accuracy of frequency measurement and operation speed, that is the time interval for which the frequency of the input microwave signal should be determined. Currently, it is required that the time interval from the arrival of the microwave signal at the input of the IFM receiver to the frequency count is no more than fifty nanoseconds. This is due to the fact that existing radio engineering systems operate with radio pulses of very short duration and with signal streams approaching the pulse signals repetition frequency of 1 MHz, which in turn should reduce the time for determining (pulse-by-pulse) the frequency parameters of the input microwave signal and forming their codes at the output of the system.

In hybrid receiver for instantaneous frequency measurement of microwave signals based on frequency discriminator with a delay line, the input microwave signal is converted into cosine Ac(f) and sine As(f) signals at the output of the analog part. In the digital part, analog-to-digital conversion of Ac(f) and As(f) signals is performed into Kc(f) and Ks(f) codes, which in the frequency Ftrue of the input microwave signal is matched to the programmable logic matrix according to a certain algorithm.

The features of the implementation of the analog part and ways to improve the accuracy of instantaneous measurement of the carrier frequency of the microwave signal are considered. However, the digital part also has a great influence on the final accuracy of measuring the carrier frequency and on the operation speed, that is, on the time interval for which the frequency of the input microwave signal must be determined, and this depends on the implementation features of the digital part of the IFM receiver.

Now let us consider the features of methods and algorithms for determining carrier frequencies of the microwave signal in the digital part of the IFM receiver when operating in the zero dynamic range of input signals and in the non-zero dynamic range of input signal levels.

Salnyy I.A. Methods of implementing the digital part of the receiver with a frequency discriminator. Radioengineering. 2022. V. 86. № 11. P. 74−79. DOI: https://doi.org/10.18127/j00338486-202211-11 (in Russian)

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