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|Title:||Estimation of tropospheric time delay over Delhi|
Banerjee, P K
Reddy, B M
|Abstract:||The total zenith tropospheric time delay has been estimated at Delhi (lat. 28°38´14´´) and also a mapping function has been applied to find the corresponding time delay at various elevation angles ranging from 1 to 90°. Three methods used for calculating the time delay are Saastamoinen-Davis model, integrated precipitable water vapour (IPWV) estimates and the two-parameter model. The first two methods involve numerical integration of the radiosonde profiles right from ground (216 m, Delhi) to a height of 10 km (above this height the humidity becomes nil at our latitude), whereas the two –parameter model uses only the history of profiles. It has been found that the total time delay varies from a minimum of 7.79 ns in the month of December to a maximum of 8.54 ns in July. Also it was observed that the mapping function cannot be used below 5° elevation angle as it overestimates below this and that the function is insensitive to any season changes.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.19(1) [February 1990]|
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