Raytheon Company

Patrick M Sain

Andrew M Hautzik

Jon E Maenpa

Peter A Bellus

An electrical system includes a signal security detection system performing a method of determining a security of an interconnect. An interconnect extended between a first device and a second device. The interconnect has at least one conductive pathway aligned along a direction between the first device and the second device. A light source is configured to transmit a light through the interconnect and an optical detector is configured to receive the light passing through the interconnect. A processor records a first optical signature of the interconnect based on the light received at the optical detector at a first time, records a second optical signature of the interconnect based on the light received at the optical detector at a second time, and validates the second optical signature against the first optical signature to determine a security of the interconnect.

Method of creating an electronically readable optical fingerprint to protect an electrical interconnect

This invention discloses a method for enhancing a Global Navigation Satellite System (GNSS), such as Global Positioning System (GPS), location calculation by supplying carrier phase corrections within a GNSS receiver used with a multiple element Controlled Reception Pattern Antenna (CRPA) receiver. GNSS carrier phase measurements should be compensated for receiver hardware and directionally dependent antenna errors to obtain desired accuracies for high precision GNSS positioning applications. One technique successfully employed in Fixed Reception Pattern Antenna (FRPA) GPS sensors applies a simple directionally dependent set of correction factors to the measurement outputs. For the complex case of a GNSS receiver employing a CRPA and dynamic beam steering, however, the multiplicity of combinations of antenna element outputs makes the FRPA compensation technique impractical. Compensation of carrier phase measurements is a problem not addressed in previous GPS CRPA beam steering sensors.

System and method for correcting global navigation satellite system carrier phase measurements in receivers having controlled reception pattern antennas

Global Navigation Satellite System (GNSS) pseudorange measurements are compensated for receiver hardware and directionally dependent antenna errors to obtain desired accuracies for high precision GNSS positioning applications using a multiple element controlled reception pattern antenna (CRPA). Pseudorange errors are calibrated and stored in a sky map by azimuth, elevation, radio frequency (RF) channel, and frequency. Corrections are applied in real time to each pseudorange measurement by applying a combination of the stored errors. The coefficients of the errors in the combination are computed as a function of steering vectors and CRPA filter weights. This implements a generalized pseudorange correction able to compensate a GNSS CRPA sensor for channel dependent errors such as group delay for both the case of uniform weights for all frequencies and the more complex case of frequency-dependent weights.

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Torrance, CA, United States of America

Patrick M Sain