Adaptive signal detection on the background clutter
Journal Title: Вісник НТУУ КПІ. Серія Радіотехніка, Радіоапаратобудування - Year 2017, Vol 0, Issue 70
Abstract
Introduction. The article poses the problem of optimal detection of coherent-pulsed signals of moving targets against a background of clutter with a priori uncertainty of the signals and clutter parameters. The aim of the article is the synthesis and analysis of adaptive signal detection systems. Synthesis of adaptive detection algorithm. The algorithm for optimal detection of signals against a background of clutter is determined by calculating the likelihood ratio. The implementation of the obtained algorithm for optimal linear filtering is assumed on the basis of the adaptive matrix filter and the non-adaptive multichannel filter. Evaluation of the signal phase. A quasi-optimal algorithm for estimating the Doppler phase of the signal from the output samples of the adaptive matrix filter is synthesized. Modeling on a PC has established that the asymptotic properties of the obtained estimates are acceptable for their use in adaptive signal accumulation. Synthesis of the adaptive detection system. A detection algorithm with adaptive signal accumulation is proposed. This algorithm combines adaptation to the clutter parameters and to the Doppler phase of the signal. A block diagram of the adaptive signal detection system is given. Analysis of the adaptive detection system. The optimal size of the detuning of Doppler channels of adaptive signal accumulation is determined by PC simulation. It is established that with an allowable loss level of up to 2 dB, the number of Doppler channels can be reduced by a factor of four. Conclusion. The use of Doppler signal estimation in detection systems with adaptive signal accumulation allows reducing the number of Doppler channels or, with the same number of Doppler channels, detuning between channels, eliminating interchannel losses.
Authors and Affiliations
D. Popov
Keywords
Related Articles
- EP ID EP308201
- DOI 10.20535/RADAP.2017.70.5-10
- Views 74
- Downloads 0
The coordinated filtration of signals at change of scale of their arguments on the basis of normalized вейвлет of functions
The method of normalization " on a level " of the test signal allowing carrying out coordinated filtration of signals, with change of scale of their arguments is offered.
Development of ambiguity reducing method for determining of the ground objects coordinates by three-position passive radiocontrol system
Introduction. The feature of ranging positioning techniques is the required true coordinates selection. It leads to the need of finding the unique solution of the analytical problem. The results of the study. The newness...
Numerical investigation of characteristics of phased antenna arrays, based on printed quasi-Yagi radiating elements
Abstract. Paper presents numerical investigation of radiation and matching characteristics of a printed quasi-Yagi antenna and 11x11 2D phased array, based on quasi-Yagi radiating elements. Results were obtained by fin...
Metalоdetectors
This article is an overview of all currently existing principles of finding metals -magnetic and nonmagnetic. The main attention is focused on advanced models. Presents the comparative characteristics of various types of...
Generator of signals with the frequency-time coding on the basis of oscillator on combination frequencies
Possibility of the use of oscillator on combination frequencies as a generator of wideband signals with the frequency-time coding is examined