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- W1556743500 abstract "Since GPS has become operational the idea of augmentingthe system has been addressed. One idea is the usage ofpseudolites, which are ground-based transmitters. Pseudo-litesbroadcast a GPS-like signal and can be used to en-hancethe accuracy, integrity and availability of GPS. Themajor disadvantages are the „Near-Far Problem“ whichlimits the coverage area and transmitter generated mul-tipathdue to ground reflections and nearby reflectors. Dif-ferentapproaches have been made to overcome theseproblems, e.g. pulsed or unpulsed systems, signals trans-mittedwith a frequency offset from L1 or the usage of al-ternativecodes [8], [6], [10], [11].The Institute of Flight Guidance and Control has devel-opedsuch a pseudolite system since 1995. The system hasbeen successfully demonstrated in flight and driving trials.During these experiments it has become obvious that thetransmitter antenna is a very important part which stronglyaffects the system’s performance. Therefore a researchproject has been launched to find an optimal antenna dia-gramshaping for pseudolite transmitter antennas. The goalwas to find a beam shape which minimizes the Near-Farproblem (i.e. extend the coverage area) and which excludespossible ground reflectors (e.g. hangars, buildings etc.) toprevent multipath.Research activities started with modelling different an-tennatypes like patch antennas, helix antennas and phasedarray antennas using a special software package. Therebyparameters have been identified to shape the antenna pat-tern.Based on these results different antennas have been built to validate the theoretical models. The developed an-tennasare usable with pulsed and unpulsed systems.This paper describes results from antenna diagram simula-tionsas well as measurements from field trials. Differentantenna types will be presented with their advantages anddisadvantages. It will be shown that using the best fit an-tennadiagram, the Near-Far problem will be minimizedand the usable area can be extended." @default.
- W1556743500 created "2016-06-24" @default.
- W1556743500 creator A5044242829 @default.
- W1556743500 date "1999-09-17" @default.
- W1556743500 modified "2023-09-23" @default.
- W1556743500 title "Antenna Diagram Shaping for Pseudolite Transmitter Antennas – A Solution to the Near-Far Problem" @default.
- W1556743500 hasPublicationYear "1999" @default.
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