Citace :
BORAP
A lot of this has been said this year about the unique VĚRA passive monitoring system. However, relatively little is known that the Czech army uses another means of radio engineering. It is known by the abbreviation BORAP (Fighting Radiolocation Searcher) and, as in the case of the VĚRA system, it was developed and manufactured by the Pardubice company ERA.
Unlike VĚRA, which determines the instantaneous position of the captured signal source based on the evaluation of the time differences of the signal arrival at three receiving stations tens of kilometers apart, BORAP works on the principle of broadband interferometric aiming. Its receiving station can determine the direction of signal arrival in the monitored frequency band. Two stations must be used to determine the position of the target in the X, Y axis. They shall be deployed at an appropriate distance in the field so as to overlap their operational range. The source of the captured signal is thus located at the intersection of the measured signal arrival directions. Due to the above principle, VĚRA is much more accurate in location and management compared to BORAP, but it needs to have at least 3 or even 4 stations connected in real time. This places it more in strategic missions (lower mobility, it is more advantageous to be in one place for a longer period of time, it is not so easy to find a suitable terrain configuration). BORAP has worse parameters regarding the location and management of targets, but only two stations connected off-line are needed to perform triangulation (location and management).
If necessary, an individual station can also work, which can find out that a target is approaching from a specific direction. Therefore, BORAP, which is also called a directional system, is more suitable for tactical missions. In fully passive mode, it automatically targets and monitors sources of radar and radio radiation (aircraft radars, active jammers, navigation systems, identification systems, radio traffic, data link operation, etc.) and then analyzes, records and, after processing, transmits signals to a higher level of command. . Like VĚRA, BORAP can process up to 200 targets. It has a range of up to 450 km, a field of view of 120 ° and the band of the received frequency ranges is in the range of 0.8 to 18 GHz. It consists of two independent directional stations, each station consisting of an antenna unit and an evaluation container with the operators' workplace.
As already mentioned, each station is able to evaluate the directions of the signal source independently. To locate and manage resources (destinations) in two coordinates, it is necessary to have two interconnected stations. Localization accuracy is about an order of magnitude worse than with the VĚRA system.
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