NEW PROTECTION SYSTEM RADAR STATIONS WILL DO THEIR NEPELENGUEMYMI
In FSUE OKB MEI developed a new and effective way to protect the radar of homing weapons, in particular anti-radar missiles and reconnaissance aircraft with the provisions of forecasting instantaneous phase center through the use of additional sources of radiation.
Existing methods of protection from radar missiles do not provide effective protection and detection of location intelligence aircraft equipped with airborne adaptive devices Peleng (direction finder) to assist in determining the direction of arrival of flat spherical electromagnetic waves emanating from a center of radiation, which is identified with the phase center of the antenna, usually coinciding with the location of the radar antenna.
It is known that a plane phased array (PAR) with irregular asymmetric amplitude distribution and arbitrary location of antenna array does not have the phase center in the strict sense. However, in the far zone of a distributed system of sources of radiation in the region of their location there is a point about which the phase response has a minimum curvature of the angular variables and is approximated piece of a spherical surface.
The center of curvature of such a surface is taken as a partial phase center of the considered set of radiators. In this case, anti-radar missiles and reconnaissance aircraft, equipped finder amplitude, amplitude-phase or phase-type fix the direction of arrival of plane or spherical wave, which is determined by the direction of the radiation source, ie, the spatial position of the partial phase center.
FSUE OKB MEI engineers have developed a new effective way to protect the radar station from the anti-radar missiles and reconnaissance aircraft fitted with the board direction finder (bearing devices). The essence of the method is that by using the protected existence radar set goals - anti-radar missiles and reconnaissance aircraft, determine the parameters of its provisions - the direction, distance, speed - and emit a defined direction distracting signals N additional sources of radiation, which are separated in space and are arranged relative to each other at a distance of not less than a distance equal to the radius of the warhead defeat anti-radar missiles (PRR) and at a distance of 3-5 km from the protected radar.
And in order to obstruct the side direction finder to determine the direction of orientation of the equivalent flat or spherical wave front of the oncoming waves, it is necessary to organize a fairly rapid change in the amplitude distribution of quasi-totality of the field emitters near the missile or aircraft. That is, such that during the time interval of the relative stability of the frequency and phase state of the system board finder could not carry out the procedure DF radiation sources, even with a flatbed adaptive antenna arrays and spatial filtering algorithms and signal interference.
Onboard finders imposed recently on aircraft missiles for military purposes, have adaptive noise suppression means capable of interfering signals-selected according to their directions of arrival.
For example, on the aircraft type F-16 set the adaptive array antenna providing simultaneous selection directions of arrival of signals from multiple sources and quasi-coherent DF. In this connection the preliminary information on the technical characteristics of airborne direction finding potential enemy against which the system will be conducted interference.
For example, while the direction of arrival of the signal DF from the radiation source is a breeding time Tn direction against several signals ~ That is, if the total time objectives amount DF n T = N (Ta + Tn), p.
In order to board finder could not identify any areas of radiation from land-based sources is necessary that, while the stable distribution combined power emitters t was less than the time of selection and direction finding one direction: t (Ta + Tn).
Operation of the system begins with the search mode, in which the key, protected by radar 1 provides an overview of a given spatial sector and simultaneously controls provisions of the radiating antenna beams stations illumination, simultaneously directing them towards self-beam radar antenna with the same angular coordinates. At the same station emit illumination probe pulses at the operating frequency leading radar. Since the short-term frequency stability of the transmitter stations illumination is typically 10-6-10-7 s, these signals can be regarded as quasi-coherent.
Once capture occurs leading radar target, the target position determined parameters - angle coordinates, range and speed of radar processor on which the control unit illumination stations, wherein the processor control unit and radar illumination station, control information calculated for each JV as target designation and temporal moments of the radiation monitoring pulses, consistent with the known range of individual station podstveta (SP) to the target.
Through the interface, this information is transmitted to the optical transmitters service optical communication lines to ensure the communication with the SP. Each optical transmitter receives the control information to the adapter that converts it into a sequence of pulses of the physical protocol on a modulator that generates signals to modulate optical radiation emitter consists of a radiating element forming optics and slewing device orienting the associated optical emitter your JV .
The information transmitted on the highway connection enters the optical receivers the relevant joint venture and recycled.
Thus, the proposed method of protection from radar anti-radar missiles and reconnaissance aircraft, based on an agreed upon time of quasi-coherent pulsed radiation of space diversity focused discrete sources of radiation can operate in a predictable manner with a certain speed instantaneous position of distraction phase center of radiation in space, the non-matching the actual location of the protected radar, making it nepelenguemoy.
