RALPH FREDERIC ESCHENBACH
Pilots at Oakhill Dr, Redwood City, CA

6529830, Mar 4, 2003

Apr 26, 2001

09/844866

Ralph Eschenbach - Woodside CA

Trimble Navigation Ltd. - Sunnyvale CA

G06F16500

701215, 701213, 34235706, 342358

A method and system that provide WAAS like corrections using a server and processor on a network. For one method, satellite measurement data is collected. Satellite position error corrections are computed using the collected satellite measurement data. The computed satellite position error corrections are stored. The stored satellite position error corrections can then be later retrieved and used by a server and processor coupled to the Internet.

6741935, May 25, 2004

Jan 16, 2003

10/347032

Ralph Eschenbach - Woodside CA

Trimble Navigation Ltd. - Sunnyvale CA

G06F16500

701215, 701213, 34235706, 342358

A method and system are disclosed for providing WAAS like corrections using a server and processor on the Internet. For one method, satellite measurement data is collected. Satellite position error corrections are computed using the collected satellite measurement data. The computed satellite position error corrections are stored. The stored satellite position error corrections can then be later retrieved and used by a server and processor on the Internet.

6373429, Apr 16, 2002

Feb 6, 2001

09/777425

Ralph F. Eschenbach - Woodside CA

Trimble Navigation Limited - Sunnyvale CA

H04B 7185

34235703

A DGPS system using GPS almanac data for determining the locations-in-space and the DGPS corrections for GPS satellites for providing a differentially corrected location of a remote GPS user receiver. A GPS reference receiver determines almanac-based DGPS corrections from the differences between ranges that are measured to GPS satellites and ranges that are calculated to the GPS almanac-based locations-in-space of the GPS satellites from the known location of the GPS reference receiver. The GPS user receiver measures pseudoranges to the GPS satellites. Then, in a first embodiment, the GPS reference receiver radios the DGPS corrections to the GPS user receiver. The GPS user receiver uses almanac-based locations-in-space for the GPS satellites and the almanac-based DGPS corrections for differentially correcting the measured user pseudoranges for providing a differentially corrected user location. In a second embodiment, the GPS user receiver radios the measured user pseudoranges to the GPS reference receiver. The GPS reference receiver uses the measured user pseudoranges, the almanac-based locations-in-space for the GPS satellites, and the almanac-based DGPS corrections for providing the differentially corrected user location.

5108334, Apr 28, 1992

Jun 1, 1989

7/360081

Ralph E. Eschenbach - Redwood City CA
Arthur N. Woo - Cupertino CA

Trimble Navigation, Ltd. - Sunnyvale CA

H04B 126

455314

An antenna is employed to receive a (1540 f0) L1 GPS-satellite signal. In addition, a filter, an (RF) amplifier, a harmonic mixer, and a (sole) local oscillator are employed, the combination configured to mix the seventh harmonic of a 192 f0 local oscillator generated signal with the receive satellite signal to down-convert the frequency of the received GPS-satellite signal to a 196 f0 IF frequency. Further, another filter, an (IP) amplifier, and a mixer are employed, the combination configured to mix the fundamental of the 192 f0 local oscillator generated signal with the 196 f0 GPS-satellite signal to down-convert the frequency of the satellite signal to four f0. Finally, yet another filter and an amplifier are employed, the combination configured to filter and amplify the four f0 GPS-satellite signal.

RE37408, Oct 16, 2001

Sep 15, 2000

9/663669

Peter V. W. Loomis - Sunnyvale CA
Ralph Eschenbach - Woodside CA
Paul Braisted - San Jose CA
Chung Lau - Sunnyvale CA

Trimble Navigation Ltd. - Sunnyvale CA

G01S 502

34235712

A method for fast acquisition, in as little as 6-15 seconds, of signals from a satellite in a Satellite Positioning System (SATPS), such as GPS or GLONASS, that does not require permanent storage of satellite ephemeris information at an SATPS ground station. This SATPS signal acquisition method can be used whenever the "new" station initially powers up or has lost lock on one or more SATPS signals that must be (re)acquired. A reference SATPS station provides the new SATPS station with an estimated reference station location and ephemeris information for one or more identified SATPS satellites visible from the reference station. The new station receives and uses this information to establish carrier frequency ranges to search for the identified SATPS satellite, by limiting the search to a reduced frequency range based upon estimated Doppler shift of SATPS signals received from this satellite. The actual frequency shift may differ from the estimated Doppler shift, due in part to errors in a frequency source used by the new station. When a first SATPS satellite signal is acquired and locked onto by the new station, the error in the new station frequency source is estimated, and the frequency range for searching for an SATPS signal from another satellite is reduced.

6944542, Sep 13, 2005

Mar 12, 2003

10/388278

Ralph Frederic Eschenbach - Woodside CA, US

Trimble Navigation, Ltd. - Sunnyvale CA

G01C021/00, G01S001/00

701220, 701215, 702 94

A position determination system for movable objects or personnel comprising at least one portable position sensor built into a wearable item of a member of personnel having an identification number, or embedded into a movable object having an identification number, and a high accuracy position determination device. The high accuracy position determination device is configured to provide a set of high accuracy initialization data including a set of high accuracy absolute positional data indicative of location of the initialization device, a set of high accuracy velocity/acceleration data indicative of velocity/acceleration of the initialization device, and a set of high accuracy orientation data indicative of orientation of the high accuracy position determination device. The portable position sensor is configured to utilize the high accuracy initialization data to generate and broadcast the positional data of at least one member of personnel having an identification number, or of at least one movable object having an identification number.

6124825, Sep 26, 2000

Apr 15, 1999

9/293514

Ralph Eschenbach - Woodside CA

Trimble Navigation Limited - Sunnyvale CA

H04B 7185, G01S 1300, G08G 504

34235708

The present invention comprises a global positioning system (GPS) based augmented reality (AR) aircraft collision avoidance system. The system of the present invention includes a GPS receiver for receiving GPS signals and determining a present position using the GPS signals. The system of the present invention also includes an automatic dependent surveillance (ADS-B) receiver for receiving an ADS-B signal from an aircraft. The system of the present invention further includes an AR visor coupled to both the GPS receiver and the ADS-B receiver. The AR visor receives the present position from the GPS receiver and receives the ADS-B signal from the ADS-B receiver. Using the present position and the ADS-B signal, the AR visor determines a three dimensional bearing to the aircraft. The AR visor is adapted to be worn by a user. The AR visor is further adapted to display symbology indicating the three dimensional bearing such that the user is made intuitively aware of the three dimensional bearing via the symbology displayed in the AR visor.

7403853, Jul 22, 2008

Aug 9, 2005

11/200919

James M. Janky - Los Altos CA, US
Ralph Frederic Eschenbach - Woodside CA, US

Trimble Navigation, Ltd - Sunnyvale CA

G06F 17/00

701220, 455 24

A position determination system for movable objects or personnel comprising at least one portable position sensor built into a wearable item of a member of personnel having an identification number, or embedded into a movable object having an identification number, and Mobile Initialization Station (MIS). The Mobile Initialization Station (MIS)/Portable Initialization Station (PIS) selected from the group consisting of: {(SATPS)/transceiver unit; (GPS)/transceiver unit; and a TVPS transceiver unit} is configured to provide a set of high accuracy initialization data. The portable position sensor is configured to utilize the high accuracy initialization data to generate and broadcast the positional data of at least one member of personnel having an identification number, or of at least one movable object having an identification number.

5820080, Oct 13, 1998

Mar 14, 1996

8/615837

Ralph F. Eschenbach - Woodside CA

Trimble Navigation Limited - Sunnyvale CA

B64C 1318

244183

A precision equivalent landing system. In one embodiment, a position determining system is coupled to an aircraft. The position determining system generates lateral position information of the aircraft with respect to a landing approach path. An altimeter is also coupled to the aircraft. The altimeter generates vertical position information of the aircraft with respect to the landing approach path. A graphic display disposed within the aircraft concurrently displays a visual representation of the lateral position of the aircraft with respect to the landing approach path and the vertical position of the aircraft with respect to the landing approach path. In so doing, the present invention provides both relative position and altitude of an incoming aircraft with respect to a landing approach path. Thus, the present invention provides a precision equivalent landing system without requiring the equipment and expense associated with ILS or FAA MLS precision landing systems.

4970523, Nov 13, 1990

Mar 27, 1989

7/328870

Paul E. Braisted - San Jose CA
Ralph F. Eschenbach - Redwood City CA

Trimble Navigation, Ltd. - Sunnyvale CA

G01S 502, G01S 352

342418

To reduce error introduced by the local oscillator in the velocity calculations, the receiver has two "tracking channels" and a microcomputer. With numbers required to, simultaneously, lock each of the "tracking channels" each to a respective satellite signal, the microcomputer employs a differential doppler technique to calculate the receiver velocity. The microcomputer calculates a number which represents the difference between the apparent doppler frequency shift of the carrier signal which is transmitted by the first "tracking channel" satellite and which is measured over a specific time period and the apparent doppler frequency shift of the carrier signal which is transmitted by the second "tracking channel" satellite and which is measured over substantially the same time period.