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I would like to know if each PRN will keep a stable relative location of
the GPS constellation (comparing to the location of other satellites).
In other word, if an old satellite with PRN X was decommissioned, will
a new satellite with the same PRN X, which will be launched in the
future into the constellation, be put into a spot that is very close to
its previously held spot? If so we may take advantage of it.
If the answer is yes, I also would like to know how close the new spot
relative to its previously held spot. A few kilometers or a few hundred
kilometers?
Thanks.
Johnson
I think it's better to replace its relative location of the
constellation with its relative location of other satellites at the same
plane.
Johnson
Johnson wrote:
> I would like to know if each PRN will keep a stable relative location of
> the GPS constellation (comparing to the location of other satellites).
> In other word, if an old satellite with PRN X was =A0decommissioned, will
> a new satellite with the same PRN X, which will be launched in the
> future into the constellation, be put into a spot that is very close to
> its previously held spot? =A0 If so we may take advantage of it.
> the GPS constellation (comparing to the location of other satellites).
> In other word, if an old satellite with PRN X was =A0decommissioned, will
> a new satellite with the same PRN X, which will be launched in the
> future into the constellation, be put into a spot that is very close to
> its previously held spot? =A0 If so we may take advantage of it.
I think (but you should give a look at historical data) PRNs can be
assigned independently from the satellite location.
PRN1 for example (if I rememeber well) has been assigned to different
SVs in different location.
You may check for some historical data about the SVs and their PRN
assignment here:
ftp://tycho.usno.navy.mil/pub/gps/gpsb2.txt
Claudio
www.claudegps.altervista.org
claudegps wrote:
>> I would like to know if each PRN will keep a stable relative location of
>> the GPS constellation (comparing to the location of other satellites).
>> In other word, if an old satellite with PRN X was decommissioned, will
>> a new satellite with the same PRN X, which will be launched in the
>> future into the constellation, be put into a spot that is very close to
>> its previously held spot? If so we may take advantage of it.
>> the GPS constellation (comparing to the location of other satellites).
>> In other word, if an old satellite with PRN X was decommissioned, will
>> a new satellite with the same PRN X, which will be launched in the
>> future into the constellation, be put into a spot that is very close to
>> its previously held spot? If so we may take advantage of it.
>
> I think (but you should give a look at historical data) PRNs can be
> assigned independently from the satellite location.
> PRN1 for example (if I rememeber well) has been assigned to different
> SVs in different location.
>
> You may check for some historical data about the SVs and their PRN
> assignment here:
> ftp://tycho.usno.navy.mil/pub/gps/gpsb2.txt
>
>
> Claudio
> www.claudegps.altervista.org
> I think (but you should give a look at historical data) PRNs can be
> assigned independently from the satellite location.
> PRN1 for example (if I rememeber well) has been assigned to different
> SVs in different location.
>
> You may check for some historical data about the SVs and their PRN
> assignment here:
> ftp://tycho.usno.navy.mil/pub/gps/gpsb2.txt
>
>
> Claudio
> www.claudegps.altervista.org
Thank you very much, Claudio,
I have confirmed that the PRNS have no fixed relative location in the
plane: They may change their PRN, and they may change their location,
and they may change their plane.
1. PRN01: Unusable 28 JAN 1993 2000 to 2200 UT for maintenance and
changed the Pseudo Range Number (PRN) from PRN32 to PRN01.
2. PRN01 was at Plane/Slot F6 on 26 NOV 2007; On 24 MAR 2009, PRN01 was
at Plane/Slot B2.
3. PRN05 was at Plane/Slot B5 on 26 NOV 2007; On 17 AUG 2009, PRN01 was
at Plane/Slot E6.
4. PRN07 was at Plane/Slot C5 on 26 NOV 2007; On 15 MAR 2008, PRN01 was
at Plane/Slot A6.
...
> I would like to know if each PRN will keep a stable relative location of
> the GPS constellation (comparing to the location of other satellites).
> In other word, if an old satellite with PRN X was =A0decommissioned, will
> a new satellite with the same PRN X, which will be launched in the
> future into the constellation, be put into a spot that is very close to
> its previously held spot? =A0 If so we may take advantage of it.
> If the answer is yes, I also would like to know how close the new spot
> relative to its previously held spot. A few kilometers or a few hundred
> kilometers?
> Thanks.
> Johnson
> the GPS constellation (comparing to the location of other satellites).
> In other word, if an old satellite with PRN X was =A0decommissioned, will
> a new satellite with the same PRN X, which will be launched in the
> future into the constellation, be put into a spot that is very close to
> its previously held spot? =A0 If so we may take advantage of it.
> If the answer is yes, I also would like to know how close the new spot
> relative to its previously held spot. A few kilometers or a few hundred
> kilometers?
> Thanks.
> Johnson
The PRN number and the satellite position in space are unrelated.
Since PRN numbers can be reassigned from the ground at any time, they
could be anywhere in the constellation. The practice is to keep a PRN
number with a satellite for it's lifetime, but there is no guarantee
that when a satellite dies, it's PRN number will be in the same
orbital slot. Don't count on it being in the same spot!
> the GPS constellation (comparing to the location of other satellites).
> In other word, if an old satellite with PRN X was decommissioned, will
> a new satellite with the same PRN X, which will be launched in the
> future into the constellation, be put into a spot that is very close to
> its previously held spot? If so we may take advantage of it.
>
> If the answer is yes, I also would like to know how close the new spot
> relative to its previously held spot. A few kilometers or a few hundred
> kilometers?
>
> Thanks.
>
> Johnson
>