High Integrity Carrier Phase Navigation for Future LAAS Using Multiple Civilian GPS Signals

Jaewoo Jung

Abstract:	In near future, there will be two more civilian GPS signals, at 1227.60 MHz and 1176.45 MHz, in addition to the present one at 1575.42 MHz. Of many possible benefits from the three civilian signals, this paper focuses on how to achieve high integrity and continuity local area differen-tial navigation by using multiple combinations of the car-rier wave frequencies of the soon available signals. It also investigates the advantages and disadvantages of the cur-rent location of the third civilian frequency. The carrier frequencies of the three civil signals can be used to form measurements with different wavelengths, both longer and shorter than their own, depending on the specific combination used. By using these combinations in cascade manner, first finding the integer of the signal with the longest wavelength then moving onto a shorter one, the L1 integer can be resolved without using redundant measurements. Since integrity and continuity of dMeren-tial carrier phase navigation depends on the validity of the integer solution, an integer rounding criteria based on wavelength and measurement noise is developed to verify the solution. Analysis of the integer rounding criteria shows that multi-ple levels of integrity and continuity for differential carrier phase navigation are possible, depending on the measure-ment noise level. Sensitivity analysis is carried out to study the effect of receiver noise, multipath delay, iono-sphere delay and change in distance between an user and a reference receiver. The analysis is done over a region of L band since location of the third frequency, although now decided, also affects the performance to some extent. An optimal location for the third frequency, with a constraint that it will be located in Aeronautical Radio Navigation Services (ARNS) band and with assumption that the sec-ond frequency will be located at the L2 frequency, is found using this analysis.
Published in:	Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999) September 14 - 17, 1999 Nashville, TN
Pages:	727 - 736
Cite this article:	Jung, Jaewoo, "High Integrity Carrier Phase Navigation for Future LAAS Using Multiple Civilian GPS Signals," Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999), Nashville, TN, September 1999, pp. 727-736.
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