NARROWING THE WIDTH OF THE SENSITIVE AREA OF MICROWAVE DOPPLER RADAR
Journal Title: Вісник Національного університету "Львівська політехніка", серія "Радіоелектроніка та телекомунікації" - Year 2014, Vol 796, Issue 2014
Abstract
The paper presents a way of narrowing the width of the sensitive area of radio-wave Doppler sensor. This is important when the sensor is used for oscillating measuring or biomedical research to eliminate the influence of extraneous moving objects that are in the process of getting into the lateral region of the antenna radiation and cause false positives or errors in the measurements. As a form of radio-wave Doppler sensitive area of the sensor is determined by the pattern of the antenna, in this paper, for its narrowing decided to use a special antenna system. This antenna system provides formation of two different shape patterns - basic and compensation, followed by the formation of difference signal information in the processing circuit. To implement antenna system two microstrip radiators rectangular shape are used - basic and additional connected by an electronic switch on p-i-n diodes. When the switch is disconnected, only the main radiator is involved in the radiation. It forms a radiation pattern with maximum normal to the plane of the radiator but with a high level of lateral radiation. This is the basic mode of operation of the sensor. In the closed state of electronic switch additional radiator is connected to the main. Options of antenna system chosen so that high-frequency energy is distributed about equally between the emitters, but the phase of the emitted waves are opposed. As a result, compensation radiation pattern appears that provides lateral radiation level comparable to the level of radiation the primary side of the radiator. However, in the normal direction is a minimum of energy. By subtracting signals obtained during open-loop and closed states of the electronic switch narrowed sensitive area is formed. The paper presents the equivalent circuit of the antenna sensor that allows for the simulation of its basic parameters. Modeling of the sensitive areas in different states of the electronic switch was carried out. The causes that affect the distortion of sensitive areas determined. Experimental model of radiowave sensor with designed antenna system was made. The material used foiled fluoroplastic. Operating frequency is 2.63 GHz. Experimental studies in the laboratory showed a narrowing of the width of the sensitive area. Suppression of the side information signal lines over 10 times, compared to the conventional mode of operation of the sensor. In this case, the amplitude of the information signal from the main direction merely reduced by 40 %.
Authors and Affiliations
Volodymyr Storozh, P. Gumenyak, N. -V. Naida
Keywords
Related Articles
- EP ID EP459711
- DOI -
- Views 105
- Downloads 0
THE ANALYSIS AND MODELING OF QUEUES FORMING AND PROCESSING IN THE NETWORK DEVICES
The investigation has covered buffer resource and queue management as main and the most important network traffic parameter and access control and overload mechanism. Network devices interaction model can performed by th...
RADIO ACCESS NETWORK MODEL WITH ADAPTIVE STRUCTURE SYNTHESIS
Constantly increasing demand by mobile devices for higher data rates and new multimedia services support creates unprecedented challenges for future fifth generation (5G) mobile networks: 1000 times higher system capacit...
MANAGEMENT OF MULTIPLE STAGE QUEUING SYSTEMS
The problem of growth of the mobile data traffic and the number of services becomes global, moreover, volume and frequency of control traffic transmitted through the network are increasing, and therefore there is a need...
METHOD OF MULTIPLEXING OF TIMER SIGNAL STRUCTURES BASED ON OFDM TECHNOLOGY
The method of multiplexing of timer signal structures. based on OFDM technology was considered. This technology is used in many data transmission standards, both in wired channels - asymmetric digital subscriber line (AD...
FORMATION OF SERVER CLUSTER NODES ENERGY CONSUMPTION MODELS FOR ENERGY EFFICIENT COMPUTING
In this paper the approach of server cluster nodes energy models forming is described. The approach is based on idea of each node’s power consumption from central processor utilization individual dependencies defining an...