GENERAL CHARACTERISTIC
      The threat of extremism and terrorist activity has expanded during the last years. That trend makes to look for the efficient methods of struggle against it. The targets of these methods include usually the efficient and early reveal of the illegal traffic of the arms, of explosive substances, of the drugs, banknotes, etc.
      One of the principal technical measures to resolve this task is the organization of the efficient distant (non - contact) examination of the people in the special control points (airports and sea ports, customs and boundary check points, the objects under the guard) and in the places of mass concentration of the people.
      The instruments used at the present time for the control, have a range of restrictions, related to the small traffic capacity, insufficient distance of action, restricted set of the detected objects (for ex., metal detectors), and also to the impossibility of their use for the mass control of the people, due to the negative consequences (generation of the penetrating radiation of the micro - wave or X-ray spectrum ranges). Besides, the contemporary explosive units are usually equipped with the fuses that start as a result of their coverage by the generating radiation.
      Electromagnetic waves of 3-mm range, due to their relatively small absorption by the fabric used to make the cloth, may become the source of the operative information about the presence of the "inclusions" under the man's cloth. The dozens of the years of research had proved the instrumental control equipment on the base of the range of 3mm of the radio waves to be the optimal as for its resolution capacity so as for the costs.
      The future perspective of the offered method for control is proved by the numerous research held by the leading companies of the world ("Lockheed Martin", "Smiths Detection", "Farran Technology", "Millivision").
      We present the results of the decencies years of the research aimed at the creation of "Zir", the passive stationary radio thermal complex for the high speed radio scanning with the frequency range of 86?100 GHz.
      "Zir" complex is designed deriving from the principle of the multi - channel parallel and sequential overview of the field of supervision with the external calibration. The complex is equipped with the scanning antenna with electric and mechanic control of orientation diagram. It is featured with the dispersion capacity that enables to form 32 independent rays along the horizontal axle. Scanning of the rays along the vertical axle is performed by the program-controlled step engine, with the fixed position of the antenna corps.
      The multi-channel radio metric input receiver is designed o the base of the full capacity scheme with two steps of frequency transformation. First frequency transformation is made using the signals of the two oscillators that are sent in turn to the mixer, according to the time periods corresponding to the uprising and falling traces of ray scanning along the vertical axle. As a result, the image is formed of two neighbouring semi - frames, and the total number of the image elements along the horizontal axle is 32. The scheme of overview of the field of supervision and of formation of the image is given at the fig. 1.

      Fig. 1 The scheme of the overview of supervision field.

      The second transformation of frequency is made in each processing channel with the changing frequencies of the second oscillators. Radio thermal complex calibration is performed using two dispersed thermal radiators, at the moment of their coverage by the antenna rays during each half - cycle of the scanning.
      Transformation of the analogue signal in digital one is made with the frequency that enables the receipt of the samplings corresponding to the movement of the antenna for approximately 0,5 of the space element of resolution along the vertical axle of the image. The same movement along the horizontal axle is performed on the base of the frequency distribution of the rays. It enables to realize, during the formation of the radio thermal image, the potential space resolution that is defined by the frequency of the antenna; it enables also to apply efficiently the mathematic processing procedures aimed at the increase of the resolution capacity (inverse filtration, etc.).
      The complex is equipped with the auto tuning of the input channels under the influence of the various destabilizing factors.

COMPOSITION OF THE SYSTEM:
      - device stand;
      - measuring stand;
      - control stand (equipment of the customer).

TECHNICAL CHARACTERISTICS

Operating frequency range, GHz	86…100
Effective noise temperature of the input, К	1600
Sensitivity of fluctuation at t=1 sec., К	0,07
Observation field dimensions, m	1,0х2,0
Channels quantity	16x2
Interspace resolution, mm	35х35 (center) 50х50 (side)
Distance, m	3,5
Time of the radiometric image forming, s	2,1
Operating conditions: temperature, °С	+20±5
Power supply of the system (50-60 Hz), V	220-230

EXAMPLES OF RADIOMETRIC IMAGES
      Examples of radiothermal image of the person carrying the various objects hidden under the cloth see as an example below.

      Radiometric view of the person with cartridge for machine gun.

      Radiometric view of the person with plastic gun.

      Radiometric view of the person with composite material - CD.

      Radiometric view of the person with package of soda.

      Synchronously with radiometric view can be the digital fotosession of the person for the documentation.

Prezentation - download