On Mon, 28 Apr 2014 21:24:56 -0700, Tom Van Baak wrote: >> Accounting for the cable delay will only correct the absolute time. >> Imagine a 100m antenna feed line; the receiver could be anywhere within >> 100m of the antenna (even above it or at it). The algorithm that computes >> position >> needs to know this.
>No. Well... Yes! Please read all of what I stated. >What the algorithm computes is position -and- time at the antenna. >It doesn't care where the receiver is, or how long the cable is. >The GPS solution gives the place and time of the antenna only. >And then, >1) If you want to translate the antenna solution to some other physical place, >then apply a dX,dY,dZ correction. >2) If you want to translate the antenna solution to some other physical time, >then apply a dT correction. >For example, >1) If the antenna is on top of a pole but you actually want the true location >of the base of the pole, you apply a spatial correction. >2) If the antenna is on top of your roof but you want the true time at a BNC >jack in your lab, you apply a temporal correction. >The confusion, >The GPS timing receivers most of us use make it easy to apply a temporal >correction, but not a spatial correction. >Consequently, your lab receiver can be configured to pulse the true time at >center of the front panel BNC. >But, your lab receiver cannot be configured to show the true location of the >center of the front panel LCD. >Instead, the LCD is stuck showing the location of your distant antenna. >/tvb >_______________________________________________ >time-nuts mailing list -- [email protected] >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. Bill Beam NL7F _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
