Small illustration of why the path length difference changes more for the case of a longer baseline, which is why an interferogram made with a longer baseline has more fringes in the range dimension.

1. Dept. of Geography / Remote Sensing Laboratories
Page 1
Why does a longer baseline mean more
interferometric fringes in the range direction?
Adrian Schubert, 02.11.2015

2. Dept. of Geography / Remote Sensing Laboratories
Page 2
dr
dr
Small baseline: increase in dr from near to far range

3. Dept. of Geography / Remote Sensing Laboratories
Page 3
dr increase
Small baseline: increase in dr from near to far range

4. Dept. of Geography / Remote Sensing Laboratories
Page 4
Large baseline: increase in dr from near to far range
dr
dr

5. Dept. of Geography / Remote Sensing Laboratories
Page 5
Larger baseline  bigger increase in dr as we
move from near to far range
 (phase cycles) as we go from
near to far range
dr increase
dr increase
Large baseline: increase in dr from near to far range