The Coherent Signals Processing Method in the Multiradar System of the Same Type Two-coordinate Surveillance Radars with Mechanical Azimuthal Rotation

Abstract

The subject of the article is the task of developing a coherent signals processing method in the multiradar system of the same type two-coordinate surveillance radars with mechanical azimuthal rotation. The goal of the paper is solving the problem of developing a coherent signals processing method in multiradar system based on radars with mechanical rotation. It has been found that, in modern-day hybrid wars, founding a reliable air defence system is made much more difficult by the appearance of low radar cross section air objects. It is proposed to increase the energy potential of existing surveillance radars by integrating them into a spatially spaced coherent multiradar system. To ensure a consistent overview of the airspace, the locations of the radars are made in a single line with their synchronous azimuthal rotation. The transmitting signals must be simultaneously transmitted and orthogonal by frequency diversity or encoding. The synthesis of the optimal coherent signal finder is performed. The characteristics of detection of air objects in a multiradar system with mutually coherent signals are evaluated, when all radars emit identical signals in such a way that their common-purpose summation is secured. The following results were obtained: the highest efficiency in signal/noise gain was shown by the addition of a second radar, the optimum number of radars in the multi-radar system of no more than four. Therefore, the most cost-effective criterion is to create a spatially coherent multiradar system by combining two to four similar radars. In this case, the expected gain in the threshold signal-to-noise can be up to eighteen decibels. The use of more than four radars is impractical because it does not lead to a significant increase in the gain. The direction of further researches is the development of a non-coherent mutually processing signals method in a multiradar system-space spatially spaced two-coordinate radar observation stations with mechanical azimuthal rotation.

Developing the model of reliability of a complex technical system of repeated use with a complex operating mode

“…When solving these problems, the developed reliability model (1), (5), (12) to (23), which is a generalization of known models and takes into account peculiarities of functioning of objects of the proposed classification group, is of great importance. The developed model, in comparison with the known ones, is based on a probabilistic approach to taking into account the operating conditions and describes a multi-stage process of intended use.…”

“…In works [1,4,5,20] devoted to the study of stationary and non-stationary CORs, specification of requirements to the CTS reliability [2,3,5,[21][22][23], the time of waiting, t, and intended use, τ, were considered only as deterministic values. Ratios were given in [3] only for the probability of no-failure operation (PNFO) at a random duration of job performance in an interval [0, ∞] for the law of exponential and normal distribution with a small coefficient of variation (no more than 0.36).…”

“…Since the random operating time of the CTS between failures and durations of ROC are assumed to be independent, then formulas (8)- (23) are used in the NCOR calculation, that is, the values F w τ…”

Methods of signal processing in a multiradar system of the same type of two-coordinated surveillance radars

“…Creating of a multi-radar system makes it possible to solve the problem of increasing the energy potential of radar, increasing the gain of antenna systems or the use of system effects. The using of system effects when combining autonomous radars into a multi-radar system is associated with the possibility of implementing different degrees of coherence of spatially spaced positions and the combined reception of echoes [9][10][11][12][13][14]. The paper proposes to combine the existing survey two-coordinate radars into a synchronous multiradar system according to the method described in [8] and is explained by the algorithm shown in Fig.…”

“…To solve this discrepancy and increase the efficiency of detection of inconspicuous air object, it is proposed to combine the existing two-coordinate survey radar into a coherent multi-radar system (MRS) with compatible signal processing [8][9][10].…”