Sunnyvale, CA, United States

Applied Signal Technology

appsig.com
Sunnyvale, CA, United States

Applied Signal Technology is a provider of advanced intelligence, surveillance and reconnaissance products, systems, and services, established in 1984 in Sunnyvale, California. Its 2009 revenue was $202.6 million with a profit of $22.9 million. Its current President and CEO is William B. Van Vleet III. AST serves the defense, intelligence, homeland security, and select commercial markets.Its products are used to scan and filter cell phone, ship-to-shore, microwave, and military transmissions and evaluate them for relevant information.In December 2010, AST agreed to be acquired by military contractor Raytheon for $490 million. Wikipedia.


Time filter

Source Type

A system and method for determining geo position of a target by an aircraft, including: (a). electronically receiving navigation data related to the aircraft and multilateration information related to the target; (b). electronically calculating a locus of emitter positions (LEP) curve from the received navigation data and multilateration information; (c). repeating steps (a) and (b), as the aircraft moves toward or away from the target; (d). electronically accumulating, in a computer storage medium, the calculated LEP curves; and (e). electronically determining a position that is closest to all the accumulated LEP curves to establish a position of the target.


Patent
Applied Signal Technology | Date: 2010-04-30

A digital filter-decimator-tuner is configured to receive a complex signal input x_(k )and output a complex USB signal yu_(k )and a complex LSB signal yl_(k). It includes a USB processing path coupled to receive x_(k )and output yu_(k), the USB processing path including a USB FIR filter configured to receive a portion of the x_(k )signal and output a first USB intermediate filtered signal, a decimator configured to decimate the first USB intermediate filtered signal and output a second USB intermediate signal, a USB tuner configured to receive the second USB intermediate signal and a USB tuning signal and output a third USB intermediate signal, and a USB equalization filter configured to receive the third USB intermediate signal, and output yu_(k); and a parallel LSB processing path coupled to receive x_(k )and output yl_(k). The USB and LSB processing paths may be implemented by the same hardware in one embodiment.


A method for target detection includes: receiving input data via an input signal; generating a histogram from the received data by a processor; rank-ordering the received data based on power or amplitude of the received input signal; comparing the ranked data received in a current time period to the ranked data received in a previous time period to calculate a Bivariate Conditional Exceedance function (BCEF); utilizing the calculated BCEF to estimate a Gumbel Copula parameter; accumulating a log-likelihood statistic from the estimated Gumbel Copula parameter and the generated histogram; comparing the log-likelihood statistic with a threshold value; and determining a detection of the target, when the log-likelihood statistic is below the threshold value.


Patent
Applied Signal Technology | Date: 2011-10-31

A system for correcting for an angle of rotation between a linearly polarized target signal and a dual-polarized antenna having vertical and horizontal outputs includes receiving a time series of signals from the vertical and horizontal outputs of the receive antenna, applying the vertical signals simultaneously to a data buffer and to a spectrum domain converter block to yield, respectively, spectral Xv(n) and Xv(k) signals, applying the horizontal signals simultaneously to a data buffer and to a spectrum domain converter block to yield, respectively, spectral Xh(n) and Xh(k) signals, detecting the angle of rotation, applying the angle of rotation and the Xv(k) and Xh(k) signals to a polarization rotation correction block to obtain polarization corrected frequency data, and applying the detected angle of rotation and the Xv(n) and Xh(n) signals to a polarization rotation correction block to obtain polarization corrected time data.


Patent
Applied Signal Technology | Date: 2010-05-04

A method and apparatus provide digital frequency channelization of a digitally sampled input stream having a first bandwidth. The method and apparatus are implementable in software, firmware or hardware and convert a first set of real samples from the input stream into a first plurality of complex samples with a first functional block performing filtering, decimation and tuning functions, convert the first plurality of complex samples into a first pair of consecutive USB and a first pair of consecutive LSB complex samples with a second functional block performing filtering, decimation and tuning functions, and convert the first pair of consecutive USB and the first pair of consecutive LSB complex samples into a two pairs of complex USB and LSB complex samples with a pair of third functional blocks performing filtering, decimation and tuning functions, and apply the two pairs of complex USB and LSB complex samples to a string of n pairs (for n greater than or equal to one) third functional blocks each performing filtering, decimation and tuning functions.


Patent
Applied Signal Technology | Date: 2011-06-27

A magnetic signal noise reduction and detection system has inputs configured to receive data from a first total field scalar magnetometer, data from a vector magnetometer, and data from a position, velocity and heading sensor, a signal processor configured with a pre-processor system, an adaptive noise cancellation system and a detection system, the pre-processor system configured to carry out initial processing of data received. The pre-processor is configured to convert data to the frequency domain and pass the converted data to the adaptive noise cancellation system. The adaptive noise cancellation system is configured to carry out multivariate regression on the converted data to reduce detected noise. The detection system is configured to detect magnetic anomalies and output information in real time about the magnetic anomalies to a user interface.


Patent
Applied Signal Technology | Date: 2013-03-15

A system and method for determining a correspondence between an Abis signaling channel and an air channel frequency designator. A monitoring instrument may be connected to multiple E1 circuits, monitoring messages sent on Abis signaling channels. By repeatedly observing channel activation messages (135) preceding channel assignment messages (145) of interest, or channel assignment messages (145) following channel activation messages (135) of interest, the instrument may infer a correspondence between an Abis signaling channel and an air channel frequency designator.


A method for determining geo-position of a target by an aircraft includes: receiving navigation data related to the aircraft including aircraft attitude information; receiving multilateration information related to the target including an angle to the target; calculating an axis for a cone fixed to the aircraft, based on the received aircraft attitude information; calculating a central angle for the cone from the received angle to the target; generating two vectors orthogonal to the cone axis; calculating a cone model from the axis, the central angle and the two vectors; and intersecting the cone model with an earth model to obtain a LEP curve, wherein the LEP curve is used to determine the geo position of the target.


Patent
Applied Signal Technology | Date: 2014-12-30

A system and method for characterizing a received radio frequency (RF) signal. In one embodiment, the system includes an antenna, a tuner, a sampler, a memory, and a processing unit connected to the memory, the processing unit being configured to receive a first sequence of samples from the sampler, perform a fast Fourier transform (FFT) operation, take the absolute value of a shifted complex frequency spectrum, perform a first filtering operation, perform a logarithmic operation, and perform an edge detection process to form an array of carrier centers and an array of carrier bandwidths. The processing unit is further configured to form, for each energy band identified as a result of the edge detection process, estimates of carrier characteristics and estimates of modulation characteristics.


An inspection system (10) and method for determining the elemental makeup of contents of an article includes a localizer (28) for identifying at least one region of interest of the article (52; 62a-c) from data representative of contents of the article, the at least one region of interest (52; 62a-c) having a cross-sectional area or a volume that is less than the entire cross-sectional area or the entire volume of the article, an associated particle imaging device (12) that produces an output that is indicative of the elemental makeup of contents of the article, a data selector (32) for selecting a portion of the output of the associated particle imaging device (12) that corresponds to respective identified regions of interest (52; 62a-c), and an analyzer (30) for analyzing the portions of the output of the associated particle imaging device (12) selected by the data selector (32) to determine the elemental makeup of contents of the article in each identified region of interest (52; 62a-c).

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