A passive electronic warfare system must deinterleave trains of pulses from a number of radar transmitters. An adaptive parametric channelizer for acquiring and tracking trains of pulses consists of an input channelizer operating under the control of a resource control processor. Each pulse descriptor word (PDW), a set of digitized signal parameters measured by a specialized receiver of radar pulse signals, is temporarily stored in a first-in-first out (FIFO) buffer memory. PDW data from the FIFO buffer memory is then applied to a set of parameter filter devices. These filters are provided with a range of parameter values, forming windows, by the resource control processor. The filters operate such that when a PDW falls within one of the filter's windows, a match output is asserted and applied to a match list generator which maps asserted matches into a list of filter index numbers. That list is applied to a mapper which transforms filter indices into track buffer indices in order to store a PDW that matches one filter into an associated track buffer of a set of track buffers. The combination of at least one parameter filter linked by the mapper with a track buffer form a track channel. The match list generator supplies data and event interrupts to the resource control processor which causes the parameter window of any track channel to be modified and force track channels to be merged.
A computer-implemented process is disclosed for processing incoming target data from a focal plane or scanning radar to accomplish multiple Target Tracking. Inputs are pixel plane coordinates and intensity of target blips. The Intelligent Target Tracking Processor (ITTP) employs an optimal target tracking algorithm. An optimal observation-to-track assignment exists when all target blips in a new frame of target data are matched up with nearby tracks, such that the sum of all the distances from each target blip to its assigned track is minimized. An expert system is used to control overall processing flow and provide efficient allocation of computing resources. Target blips without near neighbors are allowed to go directly to a real track table of established tracks, if their coordinates match-up with projected tracking gates. Otherwise, target blips are tested sequentially against two-frame, three-frame, and four- or higher-frame discriminants, to reject blips not belonging to established tracks. The ITTP can partition the pixel plane into "bite size partitions", each with a manageable number of target blips, which it handles sequentially. The ITTP is designed to handle hundreds or thousands of targets as a stand-alone processor as is required in space object tracking or military scenarios. The expert system maintains an optimum balance between correlating on existing tracks and discriminating against impossible tracks. A total of 26 different metric and radiometric target tracking discriminants are employed. The ITTP is a dynamically and optimally configured set of general purpose parallel processors.
A system to provide fractional bandwidth data transmission includes a network processor, physical layer device, or link layer device {"data device") and a plurality of link layer devices that are coupled to a plurality of input-output ports. The link layer devices are coupled in a serial daisy chain fashion and pass data via a plurality of data channels. The first linked layer device is coupled to the data device and receives data therefrom and the last linked layer device is coupled to the data device and transmits data thereto forming a ring network that includes all of the link layer devices and the data device. Data received from the data device is contained in data packets that contain a destination identifier and the data. Each link layer device receives input data packets and separates the data packets based on the destination identifier contained therein. Data packets having a destination identifier corresponding to one of the plurality of input-output ports coupled to that particular linked layer device are diverted to the identified input-output port. The remaining data, and any data generated by that link layer device, is provided to the next adjacent down-stream link layer device. Data flow control is provided in an upstream direction from one link layer device to the next adjacent up-stream link layer device as a plurality of status indicators that correspond to the plurality of data channels. Each link layer device is responsive to the plurality of status indicators by not transmitting data on data channels having a corresponding status indicator indicative that no data is to be transmitted.
Disclosed is a method of associating a single pulse from an agile emitter with previously detected pulses from that emitter in a time interval less than the pulse repetition interval (PRI) of the radar. Ambiguous phases from the previously detected pulses from the same agile emitter are stored. A single cos(aoa) from a subset of the stored ambiguous phases is estimated. A new ambiguous phase .phi..sub.m at frequency f.sub.m, is detected. This frequency is different from at least one of the frequencies associated with the phases in the stored set. The phase measurement is made between two antennas spatially separated by distance d. A set of differenced phases is formed and corresponding differenced frequencies from the stored set, with at least one member of this set being the difference of the new ambiguous phase and frequency with one of the stored phases and its associated frequency. The phase cycle measurement ambiguity integer is measured resolving the phase difference formed from the new ambiguous phase utilizing this set of phase and frequency differences. The phase cycle measurement ambiguity integer is computed resolving the new ambiguous phase difference if the new pulse is from the same emitter as the stored set by utilizing the previously estimated cos(aoa) and newly measured frequency f.sub.m. The measured and computed ambiguity integers are compared. The newly detected pulse is associated with the previously stored pulses as being from the frequency agile emitter if the integers are equal.
A method of parametric group processing includes forming a parametric index from an indexed database. A first parametric group and a second parametric group corresponding to elements in the parametric index are specified. The first parametric group and the second parametric group are merged to produce a merged parametric group. A parametric result is extracted from the merged parametric group, where the parametric result specifies a set of documents.
A system and method is provided for detecting emitter signals and for determining a scan strategy for a receiver system that receives such emitter signals. Multiple receiver hardware configurations may be available for detecting a set of emitters. A system and method are provided that allow an operator to select the most appropriate configuration for an intercepting dwell, thereby facilitating resolution of conflicting hardware configurations for different emitter modes.
