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Eric B. Rodal

Bio: Eric B. Rodal is an academic researcher. The author has contributed to research in topics: Assisted GPS & Voltage-controlled oscillator. The author has an hindex of 4, co-authored 4 publications receiving 250 citations.

Papers
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Patent
04 May 1998
TL;DR: In this paper, a GPS/GSM receiver combination for receiving GSM and GPS signals using an RF GPS integrated circuit for downconverting the GPS signal is presented, including a synthesizer for generating LO signals, first and second downconverters for using the LO signals for down-converting GPS signal, and a sampler for providing in-phase and quadrature phase sampled output signals representative of the GPS signals.
Abstract: A GPS/GSM receiver combination for receiving GSM and GPS signals using an RF GPS integrated circuit for downconverting the GPS signal. The GPS integrated circuit includes a synthesizer for generating LO signals, first and second downconverters for using the LO signals for downconverting the GPS signal, and a sampler for providing in-phase and quadrature phase sampled output signals representative of the GPS signal. The synthesizer includes a multi-mode divider for providing substantially the same first LO frequency at about the midpoint of the L1 and L2 GPS frequencies when either of a standard GSM reference frequency or historically common GPS reference frequency is selected. A standby mode in the integrated circuit is controlled by a power logic circuit using a power supply input as a logic control signal. The GSM/GPS receiver combination includes a GSM reference oscillator and a microprocessor system including a GSM frequency correction code for correcting the GSM reference frequency based upon a frequency correction beacon (FCB) signal received in the GSM signal. The GSM-based correction is then used for correcting the GSM reference frequency in order to center a frequency search for acquiring the GPS signal.

124 citations

Patent
04 May 1998
TL;DR: In this paper, a GPS receiver and an RF GPS integrated circuit are presented, which includes a synthesizer for generating LO signals, first and second downconverters for using the LO signals for downconverting the GPS signal, and a sampler for providing in-phase and quadrature phase sampled output signals representative of the GPS signals.
Abstract: A GPS receiver and an RF GPS integrated circuit for receiving a GPS signal. The GPS integrated circuit includes a synthesizer for generating LO signals, first and second downconverters for using the LO signals for downconverting the GPS signal, and a sampler for providing in-phase and quadrature phase sampled output signals representative of the GPS signal. The synthesizer includes a multi-mode divider for providing substantially the same first LO frequency at about the midpoint of the L1 and L2 GPS lo frequencies for either of two reference frequencies. The RF GPS integrated circuit uses an entirely on-chip voltage controlled oscillator (VCO) having a resonator for generating the LO signals and an entirely on-chip filter for filtering a first intermediate frequency signal.

53 citations

Patent
13 Mar 1992
TL;DR: In this paper, a voltage controlled oscillator (VCO) comprised of a differential pair of transistors that have respective positive feedback paths with phase-lead networks cross-coupled is presented.
Abstract: An embodiment of the present invention is a voltage controlled oscillator (VCO) comprised of a differential pair of transistors that have respective positive feedback paths with phase-lead networks cross-coupled. Each positive feedback path on each side has two different phase-lead branches. The two phase-lead branches have the same phase differences on each side of the differential pair, in order to maintain a symmetry that improves common-mode noise rejection on a voltage control differential input. Current-steering is used to control the mixture of currents that arrive at the bases of the differential transistor pair from the respective two different phase-lead branches, and thereby changing the frequency of the VCO.

37 citations

Patent
13 Sep 1994
TL;DR: In this article, a GPS receiver downconverter combines on a single integrated circuit, a first super-heterodyne mixer, a voltage controlled oscillator, a phase locked loop, a pair of quadrature mixers and a quantizer with outputs operable at twenty-five MHz and 2.5 MHz.
Abstract: A GPS receiver downconverter combines on a single integrated circuit, a first super-heterodyne mixer, a voltage controlled oscillator, a phase locked loop, a pair of quadrature mixers and a pair of quantizers with in-phase and quadrature-phase sampler outputs operable at twenty-five MHz and 2.5 MHz. Emitter-coupled logic and special low-voltage bipolar semiconductor technology are combined for 3.3 volt operation at under one hundred milliwatts.

36 citations


Cited by
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Patent
04 Oct 2000
TL;DR: In this paper, the authors propose an inventive navigation device that provides the user with a navigated route, together with information concerning the favorite facilities and events surrounding the route, which satisfy the preferences in a selected user profile.
Abstract: In a navigation device in accordance with the invention, user profiles may be stored and used to navigate a user who may be driving in a vehicle, on foot, or in other mode of transportation. Each user profile corresponds to one of the user's personae. For example, the user business profile corresponding to the user's business persona may be different from the user personal profile corresponding to the user's personal persona. For instance, the user business profile may include fine-dining type restaurants for business meetings while the user personal profile may instead include fast-food type restaurants for personal dining. The inventive navigation device provides the user with a navigated route, together with information concerning the favorite facilities and events surrounding the navigated route, which satisfy the preferences in a selected user profile. In accordance with an aspect of the invention, blockages may also be established using the device to avoid selected areas, e.g., high crime areas, in the navigated route, or to block transmission of selected information concerning, e.g., uninteresting facilities and events, to the inventive navigation device.

470 citations

Patent
11 Mar 2014
TL;DR: In this paper, a location-tagged data provision and display system for personal communication devices (PCD) with electromagnetic communication capability has been proposed, where 10 PCD requests maps and location tagged data from data providers and other for display on the PCD.
Abstract: A location tagged data provision and display system. A personal communication device (PCD) with electromagnetic communication capability has a GPS receiver and a display. The 10 PCD requests maps and location tagged data from data providers and other for display on the PCD. The data providers respond to requests by using searching and sorting schemes to interrogate data bases and then automatically transmitting data responsive to the requests to the requesting PCD.

427 citations

Patent
09 Jul 1999
TL;DR: In this article, a location-tagged data provision and display system for personal communication devices (PCD) with electromagnetic communication capability has been proposed, where a PCD requests maps and location tagged data from data providers and other for display on the PCD and the data providers respond to requests by using searching and sorting schemes to interrogate data bases and then automatically transmitting data responsive to the requests to the requesting PCD.
Abstract: A location tagged data provision and display system. A personal communication device (PCD) with electromagnetic communication capability has a GPS receiver and a display. The PCD requests maps and location tagged data from data providers and other for display on the PCD. The data providers respond to requests by using searching and sorting schemes to interrogate data bases and then automatically transmitting data responsive to the requests to the requesting PCD.

392 citations

Patent
27 Apr 2001
TL;DR: In this paper, a GPS system that can operate in different modes depending on the network facilities and bandwidth available, the GPS information that can be acquired, or user or system requirements.
Abstract: The present invention discloses a GPS system (100) that can operate in different modes depending on the network facilities and bandwidth available, the GPS information (114) that can be acquired, or user or system requirements. The modes comprise standalone mode, where a mobile communications device (104) computes the position of the device, an autonomous mode, where the mobile communications device (104) transmits the computed position to a server (108), application (110), or PSAP (112) in a communications network, a network aided mode, where the network aides the mobile communications device (104) in determining the position of the device, a network based mode, and other modes.

330 citations

Patent
21 Oct 1999
TL;DR: In this paper, a location-tagged data provision and display system for personal communication devices (PCD) with electromagnetic communication capability has been proposed, where a PCD requests maps and location tagged data from data providers and other for display on the PCD and the data providers respond to requests by using searching and sorting schemes to interrogate data bases and then automatically transmitting data responsive to the requests to the requesting PCD.
Abstract: A location tagged data provision and display system. A personal communication device (PCD) with electromagnetic communication capability has a GPS receiver and a display. The PCD requests maps and location tagged data from data providers and other for display on the PCD. The data providers respond to requests by using searching and sorting schemes to interrogate data bases and then automatically transmitting data responsive to the requests to the requesting PCD.

286 citations