Vijay Nagasamy - Fremont CA Mohammad Usman - Santa Clara CA James Sun - Mountain View CA
Assignee:
VSIS, Inc. - Sunnyvale CA
International Classification:
G06F16500
US Classification:
701213
Abstract:
Systems and methods are disclosed for ionospheric correction in a system employing a single GPS frequency receiver for determining the geographic location of an object on the earth's surface. The receiver receives signals transmitted at the GPS L. sub. 1 frequency from at least first, second and third GPS satellites, the first, second and third satellites having respective orbital positions relative to the receiver such that the total electron count (TEC) contribution to ionoshperic interference to signals transmitted by the respective satellites and received by the receiver is approximately the same. Respective measured distances of the three satellites to the receiver are determined based on the actual signal transmission times. True distances of the respective satellites are then calculated based on the assumption that the TEC contribution to the interference from each satellite is approximately the same.
Ionospheric Correction For Single Frequency Gps Receivers Using Two Satellites
Vijay Nagasamy - Fremont CA Mohammad Usman - Santa Clara CA James Sun - Mountain View CA
Assignee:
VSIS, Inc. - Sunnyvale CA
International Classification:
H04B 7185
US Classification:
34235706
Abstract:
Systems and methods are disclosed for ionospheric correction in a system employing a single GPS frequency receiver for determining the geographic location of an object on the earth's surface. The receiver receives signals transmitted at the GPS L. sub. 1 frequency from at least first and second GPS satellites, the first and second satellites having respective orbital positions relative to the receiver such that the total electron count (TEC) contribution to ionoshperic interference to signals transmitted by the respective satellites and received by the receiver is approximately the same. Respective measured distances of the two satellites to the receiver are determined based on the actual signal transmission times. True distances of the respective satellites are then calculated based on the assumption that the TEC contribution to the interference from each satellite is approximately the same.
"At night we can hear the gunfire," said Mohammad Usman, 49, who was among thousands of residents streaming out of the city, jamming their belongings into cars. "I'm just praying that the bullets will not find its way to my house and hit us. I hope that the bombs will not land nearby and harm us."
Date: May 25, 2017
Category: World
Source: Google
Lucknow encounter staged to polarise votes in UP in BJP's favour: Advocacy group
election. Before the sixth phase of polling the agencies were creating an atmosphere claiming the Prime Minister could be attacked. In the run up to the first phase of polling, a team of the special cell of Delhi police stayed in Sambhal to arrest Mohammad Usman following arrest of two persons in Gujarat.
Date: Mar 08, 2017
Category: World
Source: Google
Bin Laden's death does not need to be proved with a photograph
Mohammad Usman, a shopkeeper in Abbottabad, says the courier who reportedly led the CIA and US special forces to Bin Laden's compound a man called Arshad Khan used to visit the shop with his brother once a week to buy basic household essentials. They also purchased one or two cigarettes for them