Sökning: "gps receiver"

Visar resultat 1 - 5 av 36 uppsatser innehållade orden gps receiver.

1. 1. Evaluation of high rate real time GPS based tsunami warning system

   Master-uppsats, Chalmers tekniska högskola/Institutionen för radio- och rymdvetenskap

   Författare :Jonas Sundström; [2009]
   Nyckelord :GPS; Tsunami; tsunami warning system; real time; high rate GPS;

   Sammanfattning : Jet Propulsion Laboratory (JPL) is transmitting real time stream of GPS measurement over Internet via a UDP socket. It is a high rate stream that sends 1 Hz data from several stations, today the total number is 70 – 80 stations. LÄS MER

3. 2. Detection and localization of wide band interference in the global positioning system L1 band using cross correlation techniques

   Y-uppsats, Luleå tekniska universitet/Systemteknik/EISLAB

   Författare :Oscar Isoz; [2009]
   Nyckelord :GPS; GNSS; TDOA; interference; RFI; cross-correlation; globalpositioning system; navigation;

   Sammanfattning : Society is getting more and more dependent on the usage of globalnavigational satellite systems (GNSS). The signals recieved from thesatellites are very weak and therefore sensitive to interference. If the GNSSsignal gets interfered in an area, there is a potentialrisk for economic damages or even loss of life. LÄS MER

4. 3. INS measurement integration in a GPS software receiver

   Y-uppsats, Luleå tekniska universitet/Rymdvetenskap, Kiruna

   Författare :Jakob Almqvist; [2009]
   Nyckelord :GPS; INS; IMU; MEMS; accelerometers; gyroscopes; navigation; tröghetssensorer; gyroskop; kalman; filter; estimator; multipath; trilateration; pseudorange; ionosphere; fysik;

   Sammanfattning : In open sky conditions a GPS receiver normally performs very well, but in amore challenging environment, such as an urban canyon, the GPS receiver willhave more trouble coming up with an accurate position. In those environmentsthere are few or none satellites visible, and the errors grow due tomultipath and weaker signal strengths. LÄS MER

5. 4. Evaluation and analysis of GPS, EGNOS and UTC timescaleconnections

   D-uppsats, Luleå tekniska universitet/Space Science, Kiruna

   Författare :Dmitry Sidorov; [2009]
   Nyckelord :Space; navigation; satellites; performance; time function; time; GPS; GLONASS; EGNOS; EGNOS Network Time; ENT; GPST; UTC; UTC OP ; UTC IT ; UTC k ; OPMT; IENG; IGS; EGNOS Performance Observatory; EPO; CNES; positioning; velocity; time; geostationary; user level; ENTuser; RIMS; clocks; offsets; accuracy; synchronization; leap seconds; broadcast messages; MT12; message type 12; CGGTTS; hydrogen maser; caesium; atomic clocks; PRN; MJD; standard deviation; observation;

   Sammanfattning : Apart from augmenting existing satellite navigation services, the goal ofEuropean Geostationary Navigation Overlay System (EGNOS) is to provide theEGNOS user with a source of accurate time and its reference to UTC. Theobjective of this project was to develop a method of evaluating thedifference between EGNOS Network time (ENT) and independent estimation of ENT at user level in locations where EGNOS corrections are valid. LÄS MER

7. 5. Improving Reliability of IEEE-1588 in Substation Automation Based on Clock Drift Prediction

   Master-uppsats, Uppsala universitet/Institutionen för informationsteknologi

   Författare :Yin Xiao; [2008]
   Nyckelord :;

   Sammanfattning : An electric substation is a node in the power grid network. It serves the purpose of transmitting and distributing electric energy from power sources to consumers. An electric substation is made of primary equipment and secondary equipment. LÄS MER