Abstract: Nyquist folding receivers (NYFRs) are disclosed that use three or more non-modulated sampling clock signals with different frequencies to produce multiple projections in a sampled output. Using these three or more different sampling clock signals, multiple Nyquist zones are aliased together while still allowing signals from different Nyquist zones to be separated and identified in later processing based upon the sampling provided by the different sampling clock signals. NYFR sampling receivers are also disclosed that simultaneously produce multiple separate and different parallel channels from an input signal, with each different channel having a different sampling clock sampling rate from the other channels so as to generate a respective folding pattern that is different from the folding pattern generated by the respective RF sampling rate of each of the other simultaneous and parallel channels.

Abstract: Methods and systems are disclosed to operate an aircraft with modified (e.g., improved) flight performance characteristics, such as increased or maximized aircraft takeoff weight and/or longer allowable mission time for the aircraft. In one example, the aircraft may be enabled to operate with increased aircraft engine performance (e.g., such as engine power) without increasing engine temperature above the maximum allowable operating temperature limits for the engine. In a further example, available engine power may be determined during a pre-flight sequence, and utilized by an aircraft without exceeding published or manufacturer specified engine temperature limits.

Abstract: Reconfigurable payload systems (RPS) and methods of configuring and using the same with operational load envelopes are disclosed that may be employed to enable external aircraft payloads to be rapidly interchanged or swapped out together with associated internal equipment within a given aircraft so as to modify or change payload capability of the aircraft, e.g., to meet a particular mission and/or to enable use of future payload types as they are developed. The RPS and associated methods may be implemented to allow multiple different payload systems to be swapped in and out on a given aircraft as required based on needs for a given mission.

Abstract: Apparatus and methods that may be employed to install or remove a threaded connector by allowing a cable or tubing segment attached to the threaded connector to pass through an open pass-through area that is defined to extend through the tool so as to allow the threaded connector to be tightened and/or loosened relative to the fitting by turning the connector a full revolution or more while the cable or tubing is attached to the connector and extending through the tool.

Abstract: Systems and methods are provided for testing aircraft countermeasure dispenser systems (CMDS) by wirelessly monitoring and controlling wireless countermeasure dispenser testing system units (WCDTs). The disclosed systems and methods may be implemented in one example to allow functions of multiple WCDT units to be simultaneously monitored and controlled in real time via a wireless connection or wireless network connection such as wireless local area network (WLAN) or other short or long range wireless network.

Abstract: Reconfigurable payload systems (RPS) and methods of configuring and using the same are disclosed that may be employed to enable external aircraft payloads to be rapidly interchanged or swapped out together with associated internal equipment within a given aircraft so as to modify or change payload capability of the aircraft, e.g., to meet a particular mission and/or to enable use of future payload types as they are developed. The RPS and associated methods may be implemented to allow multiple different payload systems to be swapped in and out on a given aircraft as required based on needs for a given mission.

Abstract: Reconfigurable payload systems (RPS) and methods of configuring and using the same with operational load envelopes are disclosed that may be employed to enable external aircraft payloads to be rapidly interchanged or swapped out together with associated internal equipment within a given aircraft so as to modify or change payload capability of the aircraft, e.g., to meet a particular mission and/or to enable use of future payload types as they are developed. The RPS and associated methods may be implemented to allow multiple different payload systems to be swapped in and out on a given aircraft as required based on needs for a given mission.

Abstract: Systems and methods are provided for testing aircraft countermeasure dispenser systems (CMDS) by wirelessly monitoring and controlling wireless countermeasure dispenser testing system units (WCDTs). The disclosed systems and methods may be implemented in one example to allow functions of multiple WCDT units to be simultaneously monitored and controlled in real time via a wireless connection or wireless network connection such as wireless local area network (WLAN) or other short or long range wireless network.

Abstract: Systems and methods that may be implemented to provide digital data from a remote information source to multiple local user devices using a multi-layer communication path and a local wireless server node. The multi-layer communication path may, for example, include a relatively long range secure first layer wireless communications path from the remote information source to a local wireless server node, and relatively short range second layer wireless communications path from the local wireless server node to one or more local user devices.

Abstract: Systems and methods are disclosed for locating signal wave (SW) emitter/s using at least one moving signal collection platform. The disclosed systems and methods may be employed in one embodiment to estimate the signal energy transmitted from a grid of locations (such as a map) using collected IQ data (or other raw data representation such as IQ data covariance matrix), and without requiring computation of any intermediate geolocation-observable measurements (such as angle-of-arrival, direction-of-arrival, etc.). In a further embodiment, the disclosed systems and methods may be implemented in a blind manner (i.e., transmitted emitter signal/s are unknown and processed blindly) to geolocate SW emitters using a single SW signal collection platform (e.g., at relatively large standoff distances in some implementations) without relying on a known signal modulation or operation of multiple simultaneous SW signal collection platforms.

Abstract: A system and method for storing and retrieving a sparse matrix from memory of a computing device while minimizing the amount of data stored and costly jumps in memory. The computing device may be an FPGA having memory and processing elements. The method comprises storing non-zero data elements of the matrix in a data array and storing their corresponding column address values in a column index array. To read this stored data from memory, each preceding value of the column index array may be compared with each current value of the column index array to determine if the data array value corresponding with the current column index array value belongs on the next row of the matrix. The method may include pre-ordering the matrix with zero-pad placeholders or creating a row increment pointer array which typically stores fewer values than the number of rows in the matrix.

Abstract: A finite impulse response filter comprises an input formatter, a plurality of sample registers, a plurality of coefficient registers, an arithmetic unit, a multiply accumulate unit, a crosspoint switch, an interpolator, a control unit, and an output formatter. The input formatter separates the in-phase portion of a complex-number discrete-time sample from the quadrature portion. The sample registers store a plurality of discrete-time samples. The coefficient registers store a plurality of coefficients. The arithmetic unit adds two of the discrete-time samples to create a sum. The multiply accumulate unit includes a multiplier that multiplies the sum by a coefficient to create a product, an adder that adds the product to a sum of products, and a register that stores the sum of products. The crosspoint switch allows communication between the first and second plurality of registers and the arithmetic unit and the multiply accumulate unit.

Abstract: A system and method for storing and retrieving a sparse matrix from memory of a computing device while minimizing the amount of data stored and costly jumps in memory. The computing device may be an FPGA having memory and processing elements. The method comprises storing non-zero data elements of the matrix in a data array and storing their corresponding column address values in a column index array. To read this stored data from memory, each preceding value of the column index array may be compared with each current value of the column index array to determine if the data array value corresponding with the current column index array value belongs on the next row of the matrix. The method may include pre-ordering the matrix with zero-pad placeholders or creating a row increment pointer array which typically stores fewer values than the number of rows in the matrix.

Abstract: A system and method for storing and retrieving a sparse matrix from memory of a computing device while minimizing the amount of data stored and costly jumps in memory. The computing device may be an FPGA having memory and processing elements. The method comprises storing non-zero data elements of the matrix in a data array and storing their corresponding column address values in a column index array. To read this stored data from memory, each preceding value of the column index array may be compared with each current value of the column index array to determine if the data array value corresponding with the current column index array value belongs on the next row of the matrix. The method may include pre-ordering the matrix with zero-pad placeholders or creating a row increment pointer array which typically stores fewer values than the number of rows in the matrix.

Abstract: A system for a conjugate gradient iterative linear solver that calculates the solution to a matrix equation comprises a plurality of gamma processing elements, a plurality of direction vector processing elements, a plurality of x-vector processing elements, an alpha processing element, and a beta processing element. The gamma processing elements may receive an A-matrix and a direction vector, and may calculate a q-vector and a gamma scalar. The direction vector processing elements may receive a beta scalar and a residual vector, and may calculate the direction vector. The x-vector processing elements may receive an alpha scalar, the direction vector, and the q-vector, and may calculate an x-vector and the residual vector. The alpha processing element may receive the gamma scalar and a delta scalar, and may calculate the alpha scalar. The beta processing element may receive the residual vector, and may calculate the delta scalar and the beta scalar.

Abstract: Systems and methods that provide clock jitter compensation architectures that improve the performance of direct radio frequency (RF) receivers by injecting a calibration tone into the received radio frequency (RF) signals in order to help identify and then compensate for the clock jitter noise. After injecting the tone, the jitter noise going through the direct RF bandpass sampling receiver is estimated using a narrow bandwidth filter, and the received signals are further processed and demodulated depending on the Nyquist zone of the received signal. The relative modulation factor for the modulation is computed and then applied to the Nyquist zone to de jitter that particular Nyquist zone.

Abstract: Apparatus and methods for tuning the phase of a signal communicated by an electrical conductor by adjustably varying a spacing between the electrical conductor and at least a portion of an electrically conductive ground plane that is disposed in spaced relationship with the electrical conductor.

Abstract: An adaptive wakeup methodology may be implemented to allow an radio frequency identification (RFID) tag to stay synchronized with periodic radio frequency (RF) interrogator polling signal while at the same time optimizing power consumption. A receiver (or transceiver) component of a RFID tag may only be operated when an interrogator polling signal is expected, and in a manner that reduces the amount of time between when the receiver or transceiver is turned on and when the interrogator polling signal is received (i.e., the receive buffer time). At other times, the RFID tag may be placed in a low power consumption sleep state. The amount of time that the RFID tag spends in such a low power sleep state before waking and receiving the following interrogator polling signal may also be optionally adjusted, e.g., to fit characteristics of a given situation and/or to re-synchronize a given aRFID tag with first band transmissions from an aRFIDI.

Abstract: Methods and systems of processing and displaying data that include obtaining and processing time-time data to obtain an in-phase sum of the time-time data, and of providing and utilizing the in-phase sum of the time-time data to generate a graphical display of the Radon sum of the time-time data. The in-phase sum of the time-time data may be provided for display, for example, by outputting a data signal suitable for generating a graphical representation of the in-phase sum of the time-time data, and the output data signal may be utilized to generate a graphical representation of the in-phase sum of the time-time data.

Abstract: Repetitive synchronized signal events may be detected in received raw signal data that contains a signal. The type of signal, element length (or minimum interval) and/or other characteristics of such repetitive synchronized signal events may also be optionally determined. The disclosed methods and systems may be implemented for processing signals in real time as part of a receiver or transceiver system, or may be implemented by one or more computer processing components that are configured to process stored raw signal data or signal data received from another source, such as across a computer network.