A new method to determine the antenna pointing directly from Altimeter SAR mode data

Chris Ray (isardSAT, United Kingdom)

CoAuthors

Mònica Roca (isardSAT, UK)

Event: 2015 Ocean Surface Topography Science Team Meeting

Session: Instrument Processing: Measurement and retracking (SAR and LRM)

Presentation type: Type Poster

Recently we showed that it is possible to compensate the amplitude variations of the delay-Doppler map that are not related to the sea state and likewise also compensate for a dilation of range that causes a variation along track in the power. With both amplitude compensation (AC) and dilation compensation (DC) the resultant AC/DC delay-Doppler map is much simpler.

Here is presented an application of that simplified delay-Doppler map (or stack).
It is shown that because of the simple shape of the AC/DC delay-Doppler map the antenna pointing can be computed algebraically from the AC/DC delay-Doppler map.
This technique has been validated using simulated data, and then it is used to estimate the bias of the CryoSat star-tracker and compared to other previously presented methods.

This work has been carried out under the ESTEC/ESA contract to develop the Sentinel-6 Poseidon-4 Level 1 Ground Processor Prototype.
 

Poster show times:

RoomStart DateEnd Date
Grand Ballroom Foyer Thu, Oct 22 2015,11:00 Thu, Oct 22 2015,18:00
Chris Ray
isardSAT
United Kingdom
Chris.Ray@isardSAT.co.uk