if i have 2 sensors, sensor1 and sensor2, that sample a signal on complementary points so that sensor2 samples always between sensor1s sampling points. can I achieve the doubled sampling rate with the combination of both ? so with merging both samples, although they are aliased individually.
Yes; what you describe doesn't mathematically look any different than a single sampler at twice the rate. But they sensors need to sense the same, band-limited thing!
Actually, that's how some very high-speed ADCs work.
If you're not actually doing GS/s, getting a faster ADC would probably be easier than staggering multiple ADCs.