Raytheon Company

Samsung Sdi Co., Inc.

Sentronics Corporation

Gregory Sechong Um

Choong-Hoon Yi

Sun-Hee Yang

Chang-Su Seo

Robert S Hayes

Timothy Schempp

Un-Chol Oh

Won-Pil Lee

Yury N Golubev

Mark Wayne Biggs

Song-Yi Lee

A method of detecting a plasma depletion in the ionosphere includes comparing the large scale ionosphere trend with a local temporal slope of vertical or slant delay. In one example, the local temporal slope of delay is calculated phase data extracted from GPS signals at a GPS receiver, and the large scale trend is determined from broadcast ionosphere grid point delay data.

Method and apparatus for ionosphere depletion detection

A method and apparatus for directly estimating depleted ionosphere delay in a GPS receiver and using the estimate for improved navigation precision in satellite based augmentation systems.

Single frequency user ionosphere system and technique

A triodic rectifier switch includes at least one first diode connected to a data line, at least two second diodes connected to a load capacitor, a resistor having one terminal connected to a scan line and the other terminal connected to a node between the first diodes and the second diodes. The triode rectifier switch further includes at least one reset diode having one terminal connected to a node between the first and second diodes and the other terminal connected to a reset line. The second diodes are serially-connected to each other.

Triodic rectifier switch

A low cost capacitive fingerprint sensor which can be fabricated on various substrates, such as large glass or plastic substrates. The sensor is made by depositing and patterning alternate layers of conductive and insulation materials. A pixel of the sensor is comprised of a pick up pad and a plurality of voltage electrodes symmetrically placed around the pick up pad. The symmetry is such that only when a finger surface ridge is present, the pick up pad registers a signal.

Capacitive circuit array for fingerprint sensing

The present invention discloses a triodic rectifier switch (TRS) having two diodes and one resistor. Each of the two diodes includes first and second electrodes, the first electrode made of a material having a work function of more than 4.5 eV (electron volts), the second electrode made of a material having a work function of less than 4.5 eV, and a semiconductor layer formed between the first and second electrode. The first electrode is made of a material selected from a group including indium tin oxide, Ni, Se, Pt, Os, Ir, Pd, Au, Cu, Ge, Be, Te, and Mo, and the second in electrode is made of a material selected from a group including K, Na, Ca, Li, Mg, In, Ta, Pb, Ag, Al, Zn, Sn, Fe, and Cr. The first and second electrodes may also have multiple layers.

A compact sensor which maps fingerprints for identification purposes. The sensor consists of an array of pixels with each pixel configured with one or more pickup conductive electrodes surrounded by voltage electrodes of different phases. This configuration performs capacitive differencing to eliminate the large background capacitance without the need for complex sensor circuitry. In addition, the readout lines are electrically shielded from the input voltage lines by an intermediate grounded conductive layer, thereby eliminating the parasitic capacitance and allowing the detection of minute capacitance variation of the finger surface.

Growing community of inventors

Torrance, CA, United States of America

Gregory Sechong Um