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Electronic surveillance (ES) systems receive RF signatures in the form of pulse data and digitize them. The data is then processed in order to identify signals and determine the nature of the signal (threatening or non-threatening). Data processing is typically accomplished by sending the data through a pulse processor, filtering it, and comparing the filtered data to stored sets of parameters. Monitoring the performance of processors within ES systems currently in use on U.S. Navy ships is required for continued improvement in threat recognition capabilities.
Up until now, such monitoring was accomplished by analyzing recordings of the ES system’s response to known external stimuli. The external stimuli is supplied by radiating RF modulated pulses at the ES system antennas, injecting RF modulated pulses into the ES system cables, or using system specific built-in-test (BIT) capabilities. Each of these methods supply RF modulated pulses that the ES system has to process into digital pulse descriptor words (PDW). PDW are generally based on multiple measurements made on received pulses that are then grouped together in a single data package. The packages can contain measurements such as carrier frequency, signal amplitude, time of arrival, and pulse width. However, due to the ever-increasing complexity and density of emissions in the RF spectrum, this method of assessing ES system performance is outdated and insufficient. Both injecting RF and BIT data do not provide the total RF environment.
A portable PDW generator has been designed by the Navy for inserting previously recorded and digitized RF pulse data into an ES system allowing for accurate and realistic simulation of a total RF pulse environment. For example, a PDW collector captures and records an actual threat situation (such as a missile attack against a naval vessel) and stores the data as extractor files. The extractor files are then uploaded to a generator, converted to generator files and inserted into the ES system of the same ship or another ship in another part of the world to realistically simulate the particular event.
A PC provides the programming and GUI allowing a user to: (1) upload extractor files; (2) store extractor and generator files; (3) create new generator files by converting a single extractor file, combining multiple extractor files, and converting them into a single generator file, or by fabricating data files; (4) view generator files; and (5) select a generator file for insertion into the ES system and to initiate and control the insertion process.
- System is capable of inserting previously recorded or fabricated RF pulse data into an ES system to realistically simulate a complete RF pulse environment
- Can be used as a trouble-shooting tool in that ships having problems with their ES system will be able to capture and record a problem and then have analysts trouble-shoot the problem by controlled insertion back into the ES system
- An analysis of the crew's response to the simulated threat environment may be done to test and, if necessary, improve upon the crew's readiness
- US patent 7,242,346 available for license