A Novel Fast Acquisition Method for L2C Code for GPS Based Radio Occulted Systems: A FPGA Based Implementation

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 A Novel Fast Acquisition Method for L2C Code for GPS Based Radio Occulted Systems: A FPGA Based Implementation

Journal Title: International Journal of Engineering Sciences & Research Technology - Year 30, Vol 3, Issue 5

Abstract

 L2C (L2 band carrier) is the second Global Positioning System (GPS) civilian signal to become available over the full constellation. Because of the unusually-long ranging codes used in L2C signal, the search space and the computational complexity for signal acquisition become huge. Software-based GPS (SGR) Receiver helps us processing the GPS signal at the lowest level of GPS raw signal data from the antenna. A software-based GPS receiver consists of a front-end device that converts the radio frequency signal from the antenna to an intermediate frequency in digital format. The signal thus converted is processed by high level programming language to compute position and velocity. The radio occultation (RO) technique, which makes use of radio signals transmitted by the global positioning system (GPS) satellites, has emerged as a powerful and relatively inexpensive approach for sounding the global atmosphere with high precision, accuracy, and vertical resolution in all weather conditions over both land and ocean. Basic measurements for the GPS Radio Occultation are excess carrier phase and carrier Doppler from the GPS satellites because of refraction. To measure these carrier phases and Doppler one has to acquire the signals, first. The time window of occulted signals will be very narrow. So one has to acquire the signal as soon as possible, otherwise we will miss the occultation. Conventional acquisition algorithms usually take 8 to 32 seconds for the acquisition of occulted signals, depending upon the received signal strength and Doppler. This paper aims at reducing the acquisition time in the range of 1 second to few milliseconds. GPS signals are transmitted at L1 as well as L2C frequencies. The paper will be aiming at acquisition of L2C signals

Authors and Affiliations

Anila K*1

Keywords

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EP ID EP127652
DOI -
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