Method and apparatus for adding data attributes to e-mail messages to enhance the analysis of delivery failures
The present invention enables servers to send dummy e-mail messages to one another in order to receive status of e-mail identifications. The protocol layer is extended to include a user field to indic... Read More
Inventors: Kubik, Joseph; Ullmann, Lorin Evan;, Assignee: International Business Machines Corporation (Armonk, NY) |
Power resource management system
The present invention disclosed and claimed herein compromises a power management system for managing power distribution between an operating system and a recharging operation of a battery. A positive... Read More
Inventors: Armstrong, II, Gene L.;, Assignee: Benchmarq Microelectronics, Inc. (Carrollton, TX) |
Dual conversion transmitter
It is therefore an object of the present invention to provide an inexpensive transmitter. It is another object of the present invention to provide a transmitter implemented with a filter which does no... Read More
Inventors: Ohmagari, Shinichi; Yamamoto, Osamu;, Assignee: NEC Corporation (Tokyo, JP) |
GPS synchronized frequency/time source
Generally speaking, the GPS-based frequency/time source of the present invention provides an accurate, traceable low-cost frequency/time reference. In particular, the invention includes a GPS receiver... Read More
Inventors: Osterdock, Terry N.; Westcott, David C.; Hua, Quyen D.;, Assignee: Stellar GPS Corporation (San Jose, CA) |
Single-chip GPS receiver digital signal processing and microcomputer
OF THE PREFERRED EMBODIMENT FIG. 1 illustrates a GPS digital integrated circuit (IC) embodiment of the present invention, referred to herein by the general reference numeral 10. The IC 10 carries out... Read More
Inventors: Lau, Chung Y.; Martin, Kreg A.; Lake, Gary W.;, Assignee: Trimble Navigation Limited (Sunnyvale, CA) |
Sync acquisition and tracking circuit for DS/CDMA receiver
It is therefore an object of the present invention to provide a precision sync acquisition and tracking circuit for a direct sequence spread spectrum receiver. According to the present invention, ther... Read More
Inventors: Kaku, Tomoya; O'Regan, Sean;, Assignee: NEC Corporation (JP) |
Channel-independent equalizer device
OF THE DISCLOSURE The present invention is primarily intended for use in cellular communication systems, although it will be understood by those skilled in the art that the present invention can be u... Read More
Inventors: Dent, Paul W.;, Assignee: Ericsson Inc. (Research Triangle Park, NC) |
Method and apparatus for increasing receiver immunity to interference
The process of the present invention adjusts the gain of a receive circuit, thereby improving a receiver's immunity to interference. The circuit has an LNA which amplifies the received signal. The rec... Read More
Inventors: Hutchison, IV, James A.; Wheatley, III, Charles E.; Wieck, Chris P.;, Assignee: QUALCOMM Incorporated (San Diego, CA) |
Voice activity detector
What is claimed is: 1. A voice activity detector for detecting the presence of speech in an input signal which comprises a noise component, said detector comprising: (a) means for storing an estimate ... Read More
Inventors: Barrett, Paul Alexander;, Assignee: British Telecommunications public limited company (London, GB2) |
GPS receivers and garments containing GPS receivers and methods for using these GPS receivers
The present invention provides a GPS receiver having multiple GPS antennas which are coupled to one digital memory or several digital memories in order to store digitized signals which are obtained th... Read More
Inventors: Krasner, Norman F.;, Assignee: SnapTrack, Inc. (San Jose, CA) |
Method and apparatus for determining the location of an object which may have an obstructed view of the sky
This invention concerns apparatus and methods for computing the location of a submerged or other remote object which may have an obstructed view of the sky using a global positioning system (GPS) rec... Read More
Inventors: Krasner, Norman F.;, Assignee: SnapTrack, Inc. (San Jose, CA) |
Hysteresis-free anti-saturation circuit
It is accordingly an object of the present invention to avoid saturation over a wide range of received signal strengths. Another object of the invention is to avoid saturation without loss of receiver... Read More
Inventors: Ou, Waho;, Assignee: Oki Electric Industry Co., Ltd. (Tokyo, JP) |
GPS receiver utilizing a communication link
OF THE INVENTION This invention concerns apparatuses and methods for computing the position of a mobile, or remote, object in a manner that results in the remote hardware having very low power dissip... Read More
Inventors: Krasner, Norman F.;, Assignee: SnapTrack, Inc. (San Jose, CA) |
Antenna switching technique for improved data throughput in communication networks
What is claimed is: 1. An apparatus for improved data throughput in a communication network; said apparatus comprising: an antenna; a dummy load; a radio frequency receiving-transmitting circuit; a mo... Read More
Inventors: Reynolds, Jim;, Assignee: Trimble Navigation Limited (Sunnyvale, CA) |
Method and apparatus for eliminating ionospheric delay error in global positioning system signals
The present invention utilizes a semi-codeless technique to obtain ionospheric delay measurements by utilization of some knowledge of the E (or Y) code. An algorithm that makes use of some knowledge o... Read More
Inventors: Milton, Kevin; Meyer, Ron;, Assignee: Rockwell Science Center, Inc. (Thousand Oaks, CA) |
Wireless communication system for adapting to frequency drift
OF THE PREFERRED EMBODIMENTS FIG. 1 illustrates a wireless communication system of the present invention and referred to by the general reference number 10. The system 10 includes a remote transceive... Read More
Inventors: Farrer, Leland M.; Chan, Joseph S.; Garry, Jr., Robert F.; Glorioso, Charles A.; Krasner, Norman F.;, Assignee: Whisper Communications, Inc. (Sunnyvale, CA) |
Reduction of time to first fix in an SATPS receiver
The invention focuses on initial acquisition (at the time of power-up), reacquisition (after loss of lock) and identification of visible SATPS satellites by an SATPS station that includes an SATPS sig... Read More
Inventors: Loomis, Peter V. W.; Eschenbach, Ralph; Braisted, Paul; Lau, Chung;, Assignee: Trimble Navigation Ltd. (Sunnyvale, CA) |
Method and circuit for achieving frequency conversion
The present invention was made so as to solve the above problems and has as an object thereof to provide a frequency conversion method and a frequency conversion circuit which enlarge the frequency di... Read More
Inventors: Ikeda, Yuka; Kanai, Yasunori;, Assignee: Shinko Electric Industries, Co., Ltd. (Nagano, JP) |
Method and apparatus for determining time for GPS receivers
The present invention discloses a method and apparatus for acquiring timing signals for use in a Global Positioning System (GPS) receiver. In an embodiment of the present invention, the GPS receiver i... Read More
Inventors: Krasner, Norman F.;, Assignee: SnapTrack, Inc. (San Jose, CA) |
Method and apparatus for tracking a communication signal in a wireless communication system
OF THE PREFERRED EMBODIMENT An improvement for tracking a mobile communication signal which operates in a code division multiple access wireless communication system is presented. This approach emplo... Read More
Inventors: He, Rong;, Assignee: Motorola, Inc. (Schaumburg, IL) |
Method and arrangement for antenna selection control in a radio receiver
Starting from this prior art, it is the object of the invention to specify a method and an arrangement of the type mentioned at the beginning which method and which arrangement, respectively, on the b... Read More
Inventors: Euscher, Christoph; Pillekamp, Klaus-Dieter;, Assignee: Siemens Aktiengesellschaft (Munich, DE) |
Apparatus and method for receiving position and control signals by a mobile machine
I claim: 1. An apparatus for receiving position and command signals by a mobile machine, comprising: a base station adapted to receive GPS signals, and transmit at least one of a DGPS signal and a com... Read More
Inventors: Gudat, Adam J.;, Assignee: Caterpillar Inc. (Peoria, IL) |
Fixed wireless loop system that ranks non-assigned PN codes to reduce interference
The foregoing and other problems are overcome and the objects and advantages are realized by methods and apparatus in accordance with embodiments of this invention. Disclosed is a method for operating... Read More
Inventors: Nieczyporowicz, Leon L; Stephenson, Philip L; Giallorenzi, Thomas R; Steagall, Robert W;, Assignee: L-3 Communications Corporation (New York, NY) |
Processing a spread spectrum signal in a frequency adjustable system
In one aspect, the invention features processing a spread spectrum signal sampled at a selected sampling rate. The sampled signal is received, despread, and accumulated at a center frequency lower tha... Read More
Inventors: Ramberg, Erik A.; Froelich, Robert K.; Fulton, Forrest F.;, Assignee: CellNet Data Systems, Inc. (San Carlos, CA) |
Method and apparatus for evaluating a received signal in a wireless communication utilizing long and short term values
It is therefore an object of the invention to provide a dual stage method and apparatus for accurately evaluating a received signal by providing a mobile station with a concise and consistent measure ... Read More
Inventors: Willhoff, Steven J.; Meche, Paul S.; Mayes, John S.; LaBauve, Lance Miguel; Pyle, Mark Bruce;, Assignee: Nortel Networks Corporation (Montreal, CA) |
Method and system for using altitude information in a satellite positioning system
The present invention provides various methods and apparatuses for determining a position of a mobile satellite positioning system (SPS) receiver with the use of altitude information. In one example o... Read More
Inventors: Sheynblat, Leonid;, Assignee: SnapTrack, Inc. (San Jose, CA) |
CDMA synchronous acquisition circuit
The present invention has been implemented to overcome the above problems of the prior art, and has an object to provide a CDMA synchronous acquisition circuit which can surely remove DC offset compon... Read More
Inventors: Yanagi, Shuzo;, Assignee: NEC Corporation (Tokyo, JP) |
GPS receiver and method for processing GPS signals
This invention concerns apparatus and methods for computing the position of a mobile, or remote, global positioning system (GPS) receiver with very low received signal levels. As illustrated in FIGS.... Read More
Inventors: Krasner, Norman F.;, Assignee: SnapTrack, Inc. (San Jose, CA) |
Method and apparatus for acquiring satellite positioning system signals
The present invention provides various methods and apparatuses for reducing the acquisition time of signals from SPS satellites. In an example of a method of the present invention, an approximate loca... Read More
Inventors: Krasner, Norman F.;, Assignee: SnapTrack, Inc. (San Jose, CA) |
Automatic cellular phone tracking
These needs are met by the invention, which provides a system that may be local or global for automatically tracking the movements of a plurality of cellphone subscribers from one cellzone to another.... Read More
Inventors: Schipper, John F.;, Assignee: Trimble Navigation Limited (Sunnyvale, CA) |
Cell Phones 
