Hi Abhishek!
Most of the amateur UAV developers are working with Manual Landing and Takeoffs. Autonomous landing requires very high precision GPS(DGPS,WAAS) and altitude sensors. Landing is not just about decreasing height and ultimately touching down. There is a procedure for landing like joining the circuit at a way point at a certain height, doing the down wind leg, base leg & then final approach. Then and then only you will land where you wanted to.
I have never thought of Autonomous landing and takeoff, but as you have asked, in my opinion you should have a landing circuit which a set of way points at fixed altitudes. You can first experiment with doing just landing approaches and if perfectly done you can experiment with touch down with help of a range sensor for flare.
This site is about autonomous flight. Were you looking for advice on autonomous takeoff and landing? (We've haven't discussed that here yet--it's not a high priority, since it doesn't allow us to do anything we can't already do manually--but perhaps someone has some experience)
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Most of the amateur UAV developers are working with Manual Landing and Takeoffs. Autonomous landing requires very high precision GPS(DGPS,WAAS) and altitude sensors. Landing is not just about decreasing height and ultimately touching down. There is a procedure for landing like joining the circuit at a way point at a certain height, doing the down wind leg, base leg & then final approach. Then and then only you will land where you wanted to.
I have never thought of Autonomous landing and takeoff, but as you have asked, in my opinion you should have a landing circuit which a set of way points at fixed altitudes. You can first experiment with doing just landing approaches and if perfectly done you can experiment with touch down with help of a range sensor for flare.
is this a hand launch or roll out ,what plane are you useing and what is it doing when you try?