Abstract: In one aspect, a method includes performing a mapping on bits to form a complex data symbol, applying a frequency rotation mask to the complex data symbol based on a polynomial phase, performing an inverse discrete Fourier transform (IDFT) after applying the frequency rotation mask, applying a time domain window after performing the IDFT, converting digital data to analog data after applying the time window and transmitting the analog data as an analog signal.

Abstract: In one aspect, a method includes performing a mapping on bits to form a complex data symbol, applying a frequency rotation mask to the complex data symbol based on a polynomial phase, performing an inverse discrete Fourier transform (IDFT) after applying the frequency rotation mask, applying a time domain window after performing the IDFT, converting digital data to analog data after applying the time window and transmitting the analog data as an analog signal.

Abstract: A method for comparing a first print image having a first set of minutiae to a second print image having a second set of minutiae, wherein at least a second subset of minutiae from the second set is mated to a first subset of minutiae from the first set, the method that includes the steps of: selecting (350) a first pair of minutiae from the first subset and a second pair of corresponding mated minutiae from the second subset; generating (350) a first segment based on the first pair of minutiae and a second segment based on the second pair of minutiae; generating (360) a first cross-section profile based on the first segment and a second cross-section profile based on the second segment; and computing (365) at least one similarity measure that is indicative of the similarity between the first cross-section profile and the second cross-section profile.

Abstract: A method for comparing a first print image having a first set of minutiae to a second print image having a second set of minutiae, wherein at least a second subset of minutiae from the second set is mated to a first subset of minutiae from the first set, the method that includes the steps of: selecting (350) a first pair of minutiae from the first subset and a second pair of corresponding mated minutiae from the second subset; generating (350) a first segment based on the first pair of minutiae and a second segment based on the second pair of minutiae; generating (360) a first cross-section profile based on the first segment and a second cross-section profile based on the second segment; and computing (365) at least one similarity measure that is indicative of the similarity between the first cross-section profile and the second cross-section profile.

Abstract: The programmable interface gives a Block Floating Point processor the capability of performing various real-time signal algorithms on collected radar data in an external batch memory. Normally, Block Floating Point processors are not capable of accommodating data having varying exponent scales such as the data received from a batch memory in a radar system. The programmable interface solves the exponential normalization process using two data paths, an instruction processor, a microcode processor, a pre-shift control and an address generator. Data flow instructions are passed from the instruction processor to the microcode processor which executes the particular instruction's timing sequence. The first data path passes data from the batch memory to the array processor and contains a pre-shifter to normalize the batch memory-stored data. The second data path passes the processed data from the processor to the batch memory.

Abstract: Apparatus for generating an output digital signal that approximates the value of a predetermined mathematical function lying in the X-Y plane at a point defined by an input digital signal. The mathematical function is approximated by a plurality of linear least-mean-square line segments each of which includes a central point, R, and a slope, S, with the desired point being defined by the equation F(X) approximates R+S.DELTA.X, where .DELTA.X is the X distance between the central point R and the desired point. R, S and .DELTA.X are precalculated and stored in PROM lookup tables and combined as stated in the above equation.

Abstract: The processing unit includes at least one complex multiplier having hour multiplying circuits for multiplying the real and imaginary components of two complex vectors and combining the products to produce a complex output vector. Representing the input complex vectors by (A+jB) and (C+jD) the output complex vector becomes (AC-BD)+j(BC+AD). The combining circuits can be switched so that one of the input complex vectors is conjugated and the output complex vector becomes (AC+BD)+j(BC-AD). Thus, the present processing unit can provide the dot product of two complex vectors or the like.

Abstract: A directional main antenna and N omnidirectional auxiliary antennas connected to each supply an m-sample batch of signals to apparatus for developing a weighting vector 2 through Batch Covariance Relaxation apparatus, which weighting vector is then used to weight the signals from the auxiliary antennas and the weighted outputs are summed with the signal from the main antenna to suppress undesired sidelobe interferences. The processor includes apparatus performing complex vector dot product multiplication, dividing apparatus, apparatus for adding or subtracting to provide the recursive updating of vectors and memories for storing the various signals between operations.

Abstract: Digital scaling apparatus adapted to receive a plurality of digital signals each composed of a plurality of bits which first encodes each of the digital signals in accordance with the number of left shifts possible in each signal without losing any data, and then compares the encoded signals to select the largest digital signal, which selected encoded signal is used as a command to shift all of the digital signals an amount necessary to left justify the largest digital signal.

Abstract: An adaptive antenna array including a main antenna and at least one auxiliary antenna with a plurality of weight adjusting channels and circuitry for adjusting the gain of each channel periodically switched into each channel, and each channel further including memory means for continued gradient control during period that the circuit is connected to other channels.

Abstract: A method and apparatus for suppressing carrier leakage components in a system for modulating a carrier with a selected signal wherein the carrier and a quadrature component of the carrier are weighted and summed with the modulated carrier to produce a component substantially equal and opposite in phase to the leakage component so that the summing substantially cancels or suppresses the leakage component.

Abstract: An adaptive antenna array including a main antenna and an auxiliary antenna with a steepest descent controller for deriving the optimal feedback gain to guarantee stable and rapid convergence of the weights comprising the weight vector w(t) to form a null in the direction of interference while having minimal effect on the main beam.

Abstract: The present invention involves the use of an adaptive power injection apparatus with an existing antenna having a radiation pattern characterized by a relatively narrow main beam and a plurality of low level sidelobes for the purpose of enhancing the performance of the main antenna in a jamming evironment. The said apparatus consists of an adaptive subarray constrained to maintain a null in the direction of the main beam of the existing antenna. More specifically, the said adaptive array is composed of several individual antennae having relatively wide-beam patterns and combined with the existing antenna through individual IF stages all identical to the IF stage of the existing antenna, individual phase shifters which provide phases necessary for maximum reception from the direction of the main beam of the existing antenna and individual adjustable weights.

Abstract: A system for measuring the minimum miss distance and direction in three planes of a missile trajectory with respect to a target. Space diverse sequential range measurements are made from a plurality of pulse radar sensors mounted on the target. The range measurements are position identified in pairs of data transmitted to a data processor. The data processor adds time data and utilizes a nonlinear conjugate directions algorithm to solve for the minimum miss distance vector with a high degree of accuracy in a relatively short time period.