Couple of questions on RECEIVER SPEED, CLOCK BIAS-POSITIONING, ACCURACY of GPS.

[Fida Hasan]

Hi,
I was just wondering if anyone helps me answering the following questions. Maybe they are fundamental but are lurking in my mind. Maybe they are dumb, :) whatever; will appreciate much your answer.

1. Does SPEED (120km/hr) of GPS receiver has any direct impact on the timing estimation and therefore time accuracy (precision) of a GPS receiver? (Only sole speed, not considering any signal reception issue due to the change of the ambient due to the speed.)

2. As long as we have 4 satellites with good geometry, a receiver supposed to estimate the clock bias successfully. So, with 4 satellite coverage whether any receiver bias can affect the positioning accuracy by anyway?
I heard that it cannot, then any low-end consumer grade receiver's performances should be same as high-end receivers under the condition of 4 satellites, isn't it?

Thanks in Advance!

[Piso Mojado]

Post by Fida Hasan
Hi,
I was just wondering if anyone helps me answering the following questions. Maybe they are fundamental but are lurking in my mind. Maybe they are dumb, :) whatever; will appreciate much your answer.
1. Does SPEED (120km/hr) of GPS receiver has any direct impact on the timing estimation and therefore time accuracy (precision) of a GPS receiver? (Only sole speed, not considering any signal reception issue due to the change of the ambient due to the speed.)
2. As long as we have 4 satellites with good geometry, a receiver supposed to estimate the clock bias successfully. So, with 4 satellite coverage whether any receiver bias can affect the positioning accuracy by anyway?
I heard that it cannot, then any low-end consumer grade receiver's performances should be same as high-end receivers under the condition of 4 satellites, isn't it?
Thanks in Advance!

Ya' got way too much time on your hands, dude.

[Ed Pawlowski]

Post by Fida Hasan
Hi,
I was just wondering if anyone helps me answering the following
questions. Maybe they are fundamental but are lurking in my mind.
Maybe they are dumb, :) whatever; will appreciate much your answer.
1. Does SPEED (120km/hr) of GPS receiver has any direct impact on the
timing estimation and therefore time accuracy (precision) of a GPS
receiver? (Only sole speed, not considering any signal reception issue
due to the change of the ambient due to the speed.)

At typical road speeds you won't see a measurable difference. Once you
pass the speed of light, the clock becomes unreliable.

Post by Fida Hasan
2. As long as we have 4 satellites with good geometry, a receiver
supposed to estimate the clock bias successfully. So, with 4 satellite
coverage whether any receiver bias can affect the positioning accuracy
by anyway?
I heard that it cannot, then any low-end consumer grade receiver's
performances should be same as high-end receivers under the condition
of 4 satellites, isn't it?

Yep.

[John Henderson]

Post by Ed Pawlowski
At typical road speeds you won't see a measurable difference. Once you
pass the speed of light, the clock becomes unreliable.

Is that because its hands can't go backwards?

John

[Frank]

Post by John Henderson

Post by Ed Pawlowski
At typical road speeds you won't see a measurable difference. Once you
pass the speed of light, the clock becomes unreliable.

Is that because its hands can't go backwards?
John

Has something to do with entropy.