multipath_errors - Multipath error Multipath error is due...

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1 Multipath error Multipath error is due to reflected signal Code multipath error bounded by ½ chip Carrier phase multipath bounded by ¼ wavelength Hardware solutions: – Choke ring antennas – Polarized antennas Software solutions: – Narrow correlator spacing – Filtering
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2 Hardware/antenna solution for multipath Ground plane antenna Choke ring antenna (shown at right) Trough depth is tuned to quarter wavelength Presents high impedance to signals arriving from below horizontal Circular polarization Satellite transmits right hand circularly polarized wave First reflected wave is left hand circularly polarized Antenna is optimized for right hand polarization Multi-antenna spatial processing
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3 Multipath error in time domain 0 2 4 6 8 10 -1 -0.5 0 0.5 1 0 2 4 6 8 10 -1 -0.5 0 0.5 1 GPS code with no noise and no multipath With multipath signal at amplitude 0.1 of main signal and delay of 0.2 chip If we correlate on the leading edge of the main signal, can we eliminate multipath entirely? Why or why not?
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This note was uploaded on 01/15/2012 for the course EEL 6935 taught by Professor Staff during the Fall '08 term at University of Florida.

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multipath_errors - Multipath error Multipath error is due...

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