Fractal methods of selection of objects and millimeter wave radar imaging of the high resolution

Abstract

In problems of a detection there are low -contrast objects on the images used algorithms usually, use the correlation and planimetric approaches. They are implemented by methods of a compounded filtration and differential methods [1,2]. In operation the new approach to a detection low -contrast of objects on the synthesized and radar-tracking images spreading covers grounded on fiactal exposition of a phon or terrain is offered [3]. In practice h c t a l dimensionality D measure indirectly -on a declination of dependence S=S (6 ), where S -measured value, for example, length of a line or area of a figure etc., 6 -step of measuring or size of a scanning window. It's shown, that for the first time designed algorithm of a detection of object using fractal indications, stabilly operates at low values a signal / phon (-30dB and below). The algorithm at the low requirements to inventory ensures high efficiency of measurings in a mode of actual time.In the report the problems of hardware embodying of digital radars surveyed on the basis of the non conventional concept of their build-up with a fractal information handling on a carrier frequency in at microwaves with an opportunity of deriving of unique basis of a composite sounding signal.Characteristics of a bifrequency numeral radar the following: -wave length -8, 6 and 20 mm; pulsing power -10-500 mW; basis of a signal >lo6; a range resolution <2 m; an operating range <5 and 4 0 0 km; power consumption <150 W.In the report algorithms of operation and methods of a substantiation of the basic parameters and estimation of efficiency of altemate variants of millimeter radars of a detection ground of objects also presented. The algorithm. of operation of radars of a detection of ground objects is submitted and the estimation of their efficiency is carried out [4]. In a result the following deductions are made.1. The obtained performances of radars (operating range, resolving ability on range and angular coordinates, and also on sector of the radar-tracking review) are in limits of the requirements. The level of technique of microwaves allows to create such systems already now.2. The estimation of efficiency of alternate variants of systems of a detection not enough of contrast of objects has shown, that efficiency of radars on frequency be higher 100 GHz up to 20 % above can, than on frequencies is lower 30 GHz.

Application of Distributed Antenna Systems for Determination of Radiation Source Coordinates With Use of Phase Method in Fresnel Zone

“…Then by analogy with (13) and (15) it is possible to note that signals on the phase detectors outputs PD 1 (68) According to (16), (39) …”

“…The control of equation (38) is carried out in the process of harmonic signal phase adjusting. On achievement of necessary error closing, DFC is being forming again according to formula (1). Then bearing angle is determining, and the distance to SOR can be determined (in Fresnel zone) in accordance with the location of phase shifter.…”

“…Talking about evolution of passive radar systems [1] and multifunction antenna systems [2], it is necessary to acknowledge that distributed antenna systems [3,4] are supposed to be widely spread in the very near future in many areas of human activity, such as organization of high-quality mobile communication in large offices, shopping centers, fitness buildings and so on.…”