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Baseline

The basic configuration of InSAR is shown in figure D.1.

There are different representations for the baseline, see Figure D.2.

Conversions between baseline representations:

 - - - - - -

The baseline parameters can be computed when the statevectors of the points M, S and P (master ,slave and point on surface) are known. (The distance between the points x and y is denoted by ; and the sharp angle between two vectors x and y by .)

 (D1)

 (D2)

Now the perpendicular baseline has to be computed. The definition states that is positive if the slave satellite is to the right of the slant range line of the master. Which yields for a mountain an increasing phase from foot to summit(?) We had some trouble finding a simple expression to find out the correct sign but at the moment we do something like the following.

 (D3)

 (D4)

 (D5)

 (D6)

 (D7)

 (D8)

 (D9)

 (D10)

 (D11)

 (D12)

 (D13)

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Leijen 2009-04-14