John M Dolan

US Patent:

8559971, Oct 15, 2013

Filed:

Apr 5, 2011

Appl. No.:

13/080229

Inventors:

Michael A. Garcia - Herndon VA, US
Robert Mueller - Herndon VA, US
John W. Lambert - Herndon VA, US
John M. Dolan - Herndon VA, US

Assignee:

Exelis, Inc. - McLean VA

International Classification:

H04W 64/00
H04W 4/02
H04L 29/08

US Classification:

4554561, 340 81, 342387

Abstract:

A technique for determining the position of a mobile device includes receiving at the mobile device a set of time-slotted messages from a respective set of reference devices. Each of the time-slotted messages contains a slot ID indicating the assigned time slot in which it was broadcast. The slot ID is used to determine the time of transmission of each of the time-slotted messages received at the mobile device, and the position of the mobile device is determined via multi-lateration based on the time of flight of the time-slotted messages and known positions of the reference devices. According to another approach, the mobile device receives a set of ADS-B messages from a respective set of SBS ground stations. The time of transmission of each of the ADS-B messages is supplied in the ADS-B message itself or in a subsequent message and used to determined the position of the mobile device.

US Patent:

20120262339, Oct 18, 2012

Filed:

Apr 15, 2011

Appl. No.:

13/087809

Inventors:

Michael A. Garcia - Herndon VA, US
Robert Mueller - Herndon VA, US
John W. Lambert - Herndon VA, US
John M. Dolan - Herndon VA, US

Assignee:

ITT MANUFACTURING ENTERPRISES, INC. - Wilmington DE

International Classification:

G01S 1/24

US Classification:

342387

Abstract:

A technique for determining the position of a mobile device includes receiving messages from respective mobile reference devices. Each of the messages is broadcast beginning at one of several predetermined message start opportunity (MSO) times that have known timings relative to a reference time. Each of the messages contains a MSO value identifying the MSO time at which transmission of the message started. The MSO value is used to determine the time of transmission of each of the messages received at the mobile device, and the position of the mobile device is determined via multi-lateration. According to another approach, the mobile device receives a set of ADS-B messages from a respective set of mobile reference devices. The time of transmission of each of the ADS-B messages is supplied in the ADS-B message itself or in a subsequent message and used to determine the position of the mobile device.

US Patent:

20200355832, Nov 12, 2020

Filed:

Jul 24, 2020

Appl. No.:

16/937890

Inventors:

- McLean VA, US
John DOLAN - Chantilly VA, US

International Classification:

G01S 19/03
G01S 5/12
G01S 5/06

Abstract:

In one implementation, a method includes receiving versions of a message from a first satellite-based receiver and a second satellite-based receiver that both received a radio frequency (“RF”) transmission of the message, the message comprising a self-reported position of a transmitter of the message. The method also includes determining a time difference between a first arrival time of the RF transmission of the message at the first satellite-based receiver and a second arrival time of the RF transmission of the message at the second satellite-based receiver. The method further includes determining a measure of the likelihood that the self-reported position of the transmitter is valid based on the time difference between the first and second arrival times. The method still further includes transmitting an indication of the measure of the likelihood that the self-reported position is valid.

US Patent:

20200088887, Mar 19, 2020

Filed:

Sep 19, 2018

Appl. No.:

16/135558

Inventors:

- McLean VA, US
John DOLAN - Chantilly VA, US

International Classification:

G01S 19/23
G01S 19/02

Abstract:

In one implementation, a method includes receiving a number of instances of a message that includes a self-reported position of a transmitter of the message from a corresponding number of satellite-based receivers that each received an RF transmission of an instance of the message. The method also includes determining the number of satellite-based receivers that received an instance of the message and selecting a validation technique based on the number of satellite-based receivers that received an instance of the message. If the number of satellite-based receivers that received an instance of the message is one, a propagation-based validation technique is selected. The method further includes determining a measure of the likelihood that the self-reported position of the transmitter is valid using the selected validation technique, and transmitting an indication of the measure of the likelihood that the self-reported position is valid.

US Patent:

20180196140, Jul 12, 2018

Filed:

Jan 11, 2017

Appl. No.:

15/403398

Inventors:

- McLean VA, US
John Dolan - Chantilly VA, US

International Classification:

G01S 19/03

Abstract:

In one implementation, a method includes receiving versions of a message from a first satellite-based receiver and a second satellite-based receiver that both received a radio frequency (“RF”) transmission of the message, the message comprising a self-reported position of a transmitter of the message. The method also includes determining a time difference between a first arrival time of the RF transmission of the message at the first satellite-based receiver and a second arrival time of the RF transmission of the message at the second satellite-based receiver. The method further includes determining a measure of the likelihood that the self-reported position of the transmitter is valid based on the time difference between the first and second arrival times. The method still further includes transmitting an indication of the measure of the likelihood that the self-reported position is valid.

US Patent:

20180198516, Jul 12, 2018

Filed:

Jan 11, 2017

Appl. No.:

15/403383

Inventors:

- McLean VA, US
John Dolan - Chantilly VA, US

International Classification:

H04B 7/185
H04B 17/391
G01S 19/03

Abstract:

In one implementation, a method includes receiving simulated RF transmission data indicative of anticipated RF transmissions from a plurality of transmitters, wherein individual anticipated RF transmissions carry corresponding messages, and simulated position data indicative of an anticipated position of each of the plurality of transmitters. The method further includes modeling characteristics of a communications channel expected between a satellite-based receiver and at least some of the transmitters, wherein the satellite-based receiver is configured to define one or more beams for receiving anticipated RF transmissions. The method additionally includes determining a likelihood of the receiver successfully extracting one or more components of a message from one of the anticipated RF transmissions based on at least the simulated RF transmission data, the simulated position data, and the modeled characteristics of the communications channel.