Real time software based L1 C/A GPS receiver

2017 ◽  
Author(s):  
Bilal Beldjilali ◽  
Belkacem Benadda
Keyword(s):  
Real Time ◽  
Gps Receiver

A Real Time Vehicle Collision Sensor and Reporting System Using Load Sensor, GSM and GPS Technology

2013 ◽  
Vol 718-720 ◽  
pp. 1740-1745
Author(s):  
Tulu Muluneh Mekonnen ◽  
De Ning Jiang ◽  
Yong Xin Feng
Keyword(s):  
Real Time ◽  
Pressure Sensor ◽  
Reporting System ◽  
Electronic Device ◽  
Text Message ◽  
Sensor System ◽  
Gps Receiver ◽  
Gps Technology ◽  
Vehicle Collision ◽  
Load Sensor

Vehicle collision sensor system and reporting accident to police is an electronic device installed in a vehicle to inform police man in case of accident to track the vehicles location. This system works using pressure sensor, GPS and GSM technology. These technology embedded together to sense the vehicle collision and indicate the position of the vehicle or locate the place of accident in order to solve the problem immediately (as soon as possible).For doing so AT89S52 microcontroller is interfaced serially to a GSM modem, GPS receiver, and pressure sensor. A GSM modem is used to send the position (Latitude and Longitude) of the vehicle, the plate of the vehicle and the SMS text from the accident place. The GPS modem will continuously give the data (longitude and latitude) and Load sensor senses the collision of the vehicle against obstacles and input to microcontroller. As load sensor senses the collision, the GSM start to send the plate of the vehicle, text message and the position of the vehicle in terms of latitude and longitude in real time.

scholarly journals Vertical Measurement Accuracy of Mapping-Grade Global Positioning Systems Receivers in Three Forest Settings

2008 ◽  
Vol 23 (2) ◽  
pp. 83-88 ◽  
Author(s):  
Michael G. Wing ◽  
Aaron Eklund
Keyword(s):  
Real Time ◽  
Measurement Accuracy ◽  
Gps Receiver ◽  
Gps Receivers ◽  
Positioning Systems ◽  
Young Forest ◽  
Open Canopy ◽  
Time Differential ◽  
Closed Canopy ◽  
Differential Corrections

Abstract Elevation or height differences are necessary measurements for many forest operation activities. We rigorously examined the vertical measurement performance of five mapping-grade GPS receivers in three forest settings representing open-sky,young-forest, and closed-canopy conditions. The mapping-grade GPS receivers collected data simultaneously at each of the three forest settings and had different hardware and data-collection configurations, including internal and external antennas, and real-time differential corrections. We evaluated the influence of forest setting and postprocessed differential corrections on all GPS receiver measurements, including those that were collected with real-time differential corrections. We also compared the effect of 1-, 30-, and 60-point averaging intervals on vertical measurement accuracy. We found average vertical accuracies for unprocessed GPS receiver measurements of 0.9, 1.7, and 2.8 m in the open-sky, young-forest, and closed-canopy settings, respectively. The influence of data postprocessing was inconsistent under closed canopy and resulted in average vertical GPS accuracies of 0.2, 0.4, 3.3 m in open-canopy, young-forest, and closed-canopy settings, respectively. Different point averaging intervals did not result in statistically significant differences in vertical accuracies for either unprocessed or postprocessed GPS data.

GPSIM: A Personal Computer-Based GPS Simulator System

1999 ◽  
Vol 52 (1) ◽  
pp. 126-135 ◽  
Author(s):  
D. Ibrahim
Keyword(s):  
Real Time ◽  
Personal Computer ◽  
Electronic System ◽  
Route Guidance ◽  
Gps Receiver ◽  
Positioning Systems ◽  
Global Positioning ◽  
Computer Based ◽  
Marine Navigation ◽  
Positional Data

Global Positioning Systems (GPS) are now in use in many applications, ranging from GIS to route guidance, automatic vehicle location (AVL), air, land, and marine navigation, and many other transportation and geographical based applications. In many applications, the GPS receiver is connected to some form of intelligent electronic system which receives the positional data from the GPS unit and then performs the required operation. When developing and testing GPS-based systems, one of the problems is that it is usually necessary to create GPS-compatible geographical data to simulate a GPS operation in real time. This paper provides the details of a Personal Computer (PC)-based GPS simulator system called GPSIM. The system receives user way-points and routes from Windows-based screen forms and then simulates a GPS operation in real time by generating most of the commonly used GPS sentences. The user-specified waypoints are divided into a number of small segments, each segment specifying a small distance in the direction of the original waypoint. The GPS sentence corresponding to the geographical coordinates of each segment is then sent out of the PC serial port. The system described is an invaluable testing tool for GPS-based system developers and also for people training to learn to use GPS-based products.

scholarly journals Determining slack tide with a GPS receiver on an anchored buoy

2014 ◽  
Vol 18 (7) ◽  
pp. 2599-2613
Author(s):  
M. Valk ◽  
H. H. G. Savenije ◽  
C. C. J. M. Tiberius ◽  
W. M. J. Luxemburg
Keyword(s):  
Real Time ◽  
Gps Receiver ◽  
Tidal Channels ◽  
Salt Intrusion ◽  
Tidal Propagation ◽  
Novel Method ◽  
Field Campaigns ◽  
Flood Flow

Abstract. In this paper we present a novel method to determine the time of occurrence of tidal slack with a GPS receiver mounted on an anchored buoy commonly used to delineate shipping lanes in estuaries and tidal channels. Slack tide occurs when the tide changes direction from ebb to flood flow or from flood to ebb. The determination of this point in time is not only useful for shipping and salvaging, it is also important information for calibrating tidal models, for determining the maximum salt intrusion and for the further refinement of the theory on tidal propagation. The accuracy of the timing is well within 10 min and the method – able to operate in real time – is relatively cheap and easy to implement on a permanent basis or in short field campaigns.

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