Zhurnal Radioelektroniki - Journal of Radio Electronics. eISSN 1684-1719. 2021. No. 3
ContentsFull text in Russian (pdf)
DOI https://doi.org/10.30898/1684-1719.2021.3.10
UDC 621.396:681.323
CHARACTERISTICS OF DETECTING THE COHERENT SYSTEM OF SELECTION OF MOVING TARGETS DURING THE MATCHING OF THE PARAMETERS OF THE SQUARE CHANNELS
S. I. Ziatdinov
St. Petersburg State University of Aerospace Instrumentation, Bolshaya Morskaya str., 67, St. Petersburg, 190000, Russia
The paper was received on February 14, 2021
Abstract. Introduction. Operation of adaptive system of moving targets selection is considered, which is represented by single intermittent subtractor with coherent accumulator, which is tuned in frequency. System of moving targets selection is made in the form of two quadrature channels, in which high-frequency passive interference and signal from moving object are converted to video frequency with subsequent rejection, accumulation and comparison with threshold level. Setting the task. Investigation of the effect of the inevitable in practice amplitude and phase misalignments of quadrature channel parameters on the detection characteristics of the adaptive selection system of moving targets. Method. Method of complex variable is used, in which passive interference and signal from moving object at input and output of adaptive selection system of moving targets are presented in the form of pair of real components shifted in phase by ninety degrees. Results. Models of passive interference and signal from moving object are presented taking into account possible in practice amplitude and phase mismatches of quadrature channels parameters. The structure of the processing device is shown, which includes a series-connected generator of quadrature components of passive interference and a signal from a moving object, an adaptive cutting filter in the form of a single intermittent subtraction circuit with a frequency-tuned rejection zone, an adaptive coherent accumulator and a threshold device. Expressions are obtained for complex correlation functions of passive interference and signal from moving object at output of coherent accumulator taking into account inevitable amplitude and phase mismatches of quadrature channels parameters. Dependencies of probability of correct detection of signal from moving object against the background of passive interference from value of deviation of transmission coefficients of quadrature channels and phase mismatch of reference voltages for different values of average frequency of spectral density of passive interference are calculated and constructed. Conclusion. Significant dependence of probability of correct detection of signal from moving object on average frequency of spectral density of passive interference, as well as amplitude and phase mismatches of quadrature channels parameters is shown. The research methodology used allows assessing the effect of quadrature channel adjustment errors on the operation of moving target selection systems using higher order notch filters.
Keywords: coherent detector, adjustment errors, passive interference, signal, detection characteristics.
References
1. Bakulev P.A., Stenin V.M. Metody i ustroystva selektsii dvizhushchikhsya tseley. [Methods and Devices for Selecting Moving Ttargets]. Moscow, Radio i Svyaz' Publ. 1986. 286 p. (In Russian)
2. Bakulev P.A. Radiolokatsionnyye sistemy [Radar Systems]. Moscow. Radiotekhnika Publ. 2004. 319 p. (In Russian)
3. Ziatdinov S. I. Influence of mismatch of quadrature channels parameters on operation of adaptive selection system of moving targets. Izvestiya VUZov. Radioelektronika [Bulletin of Universities. Radio Electronics]. 2020. Vol.23, No.3. P.6-8. https://doi.org /10.32603/1993-8985-2020-23-3-25-31 (In Russian)
4. Michurin S.V. The effect of quadrature channel adjustment errors of a coherent system on the estimation of complex signal parameters. Izvestiya VUZov. Priborostroyeniye [Bulletin of Universities. Instrument making]. 2020. Vol.63. No.6. P.495-500. https://doi.org /10.17586/0021-34-54-2020-63-6-495-500. (In Russian)
5. Popov D.I. Autocompensation of the Doppler phase of passive interference. Tsifrovaya obrabotka signalov [Digital Signal Processing]. 2009. No.2. P.30-33. (In Russian)
6. Popov D.I. Adaptive suppression of passive interference. Tsifrovaya obrabotka signalov [Digital Signal Processing]. 2014. No.4. P.32-37. (In Russian)
7. Kotousov A.S., Morozov A.K. Optimal'naya fil'tratsiya i kompensatsiya pomekh [Optimal filtering and interference compensation]. Moscow, Goryachaya Liniya-Telekom Publ. 2008. 166 p. (In Russian)
8. Tikhonov V.I. Statisticheskaya radiotekhnika [Statistical radio engineering]. Moscow, Radio i Svyaz' Publ. 1966. 678 p. (In Russian)
For citation:
Ziatdinov S.I. Characteristics of detecting the coherent system of selection of moving targets during the matching of the parameters of the square channels. Zhurnal R
adioelektroniki [Journal of Radio Electronics]. 2021. No.3. https://doi.org/10.30898/1684-1719.2021.3.10. (In Russian)