Post Processing

[Infamy]

I read an article last week on a site that has now shut down. The main point in the article, the last 20 years has seen little improvement in Metal Detectors (probably why I've just bought a Sovereign). Today GPS meter accuracy can be reduced to mm accuracy for less than $300 using post processing PPK. When I started out in this field $40,000 was the cost of mm accuracy using GPS. The question I pose, are the largest improvements in detectors to be found in the field of post processing?

PS that $40,000 was early 1990s cash.

[Carl-NC]

Probably, at least for a little while longer. For examples, post-processing might be used to push the noise floor down and get more depth. Or by using more of the sweep data to improve the phase-to-noise ratio for better VDI. Or by combining these with MF for better ground or iron reject.

But I also think magnetic induction has fundamental limitations that cannot be overcome. Everyone would like to image a pull tab or a nail and induction just won't get us there. Something else will need to be developed. That gets us to a major difference between GPS and metal detectors: money. How many people use GPS and how many use metal detectors, and where will the R&D money go?

[Jafar]

Probably, at least for a little while longer. For examples, post-processing might be used to push the noise floor down and get more depth. Or by using more of the sweep data to improve the phase-to-noise ratio for better VDI. Or by combining these with MF for better ground or iron reject.

But I also think magnetic induction has fundamental limitations that cannot be overcome. Everyone would like to image a pull tab or a nail and induction just won't get us there. Something else will need to be developed. That gets us to a major difference between GPS and metal detectors: money. How many people use GPS and how many use metal detectors, and where will the R&D money go?

Hi Carl,
the question I want to ask is a little different from the above. I am looking to build a metal detector for high depth and a metal detector for coins. I am confused among the different designs which one to build and the fact that I am looking for an analog metal detector not a digital one. The resolution is not important either. In both cases, more depth is more important to me. And I looked for pulse-gray projects on his page but I did not find any. If they are also good, please provide them. I am waiting for your valuable suggestions.
Warm regards,