M. Koundinya,thank you for your article about two frequency GPS. From my reading I think that crucial, or a crucial benefit of a dual frequency is that that the delay from the path delay ionosphere can be estimated. The satellite radio waves are delayed through the app ionosphere by an amount closely related to their frequency so if you have two frequencies of radio waves on the same satellite you can make a good estimate of what they honestly it to Leah each of them is. This delay has been the bane of precision positioning in navigation. having an L1 and L5 signal emanating from the same satellite gives you a very precise estimate of that delay in this much better idea of your actual pseudo ranges or actual distance from you to each satellite.RTK and perhaps PPP, infusion of GPS with that I am you Gyro and accelerometer Dana Hall very promising to the proof is in the implementations..l I look forward to reading more of your articles.Thank you