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5 SUMMARY AND FURTHER RESEARCH 
The potential benefits of redundant inertial observations 
for airborne surveying have been analyzed and the the- 
ory for their processing has been presented for skewed re- 
dundant IMUs and for dual IMUs configurations. A test 
flight with a dual IMU redundant configuration with two 
Northrop-Grumann's LN-200 IMU has been realized and 
presented. The consistency of the two data sets has been 
analyzed and proven. Future research will concentrate on 
the processing of the dual LN-200 data set according to the 
theory discussed in this paper. 
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ACKNOWLEDGEMENTS 
The research reported in this paper has been funded by 
the Spanish Ministry of Science and Technology, through 
the OTEA-g project of the the Spanish National Space Re- 
search Programme (reference: ESP2002-03687). IG's Nort- 
hrop Grumman LN-200 IMU has been funded by the Cata- 
lan Department of Universities, Research and Information 
Society (DURSI) under the PIR1999 programme. 
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