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Posted by HIPAR on July 21, 2011, 11:11 am
PRN30 has been removed from the broadcast almanac.
PRN01 has been included in the almanac:

******** Week 621 almanac for PRN-01 ********
ID: 01
Health: 063
Eccentricity: 0.2546310425E-003
Time of Applicability(s): 589824.0000
Orbital Inclination(rad): 0.9600353241
Rate of Right Ascen(r/s): -0.7490598364E-008
SQRT(A) (m 1/2): 5180.309570
Right Ascen at Week(rad): -0.1884143710E+001
Argument of Perigee(rad): 2.479846239
Mean Anom(rad): 0.1795769095E+001
Af0(s): -0.9536743164E-005
Af1(s/s): 0.0000000000E+000
week: 621


--- CHAS

Posted by Alan Browne on July 21, 2011, 11:46 am
On 2011-07-21 11:11 , HIPAR wrote:
> PRN30 has been removed from the broadcast almanac.
> PRN01 has been included in the almanac:
> ******** Week 621 almanac for PRN-01 ********
> ID: 01
> Health: 063
> Eccentricity: 0.2546310425E-003
> Time of Applicability(s): 589824.0000
> Orbital Inclination(rad): 0.9600353241
> Rate of Right Ascen(r/s): -0.7490598364E-008
> SQRT(A) (m 1/2): 5180.309570
> Right Ascen at Week(rad): -0.1884143710E+001
> Argument of Perigee(rad): 2.479846239
> Mean Anom(rad): 0.1795769095E+001
> Af0(s): -0.9536743164E-005
> Af1(s/s): 0.0000000000E+000
> week: 621
> --- CHAS

Do you know which vehicle (model, #) this is?

--
gmail originated posts filtered due to spam.

Posted by HIPAR on July 21, 2011, 12:35 pm
> > PRN30 has been removed from the broadcast almanac.
> > PRN01 has been included in the almanac:
> > ******** Week 621 almanac for PRN-01 ********
> > ID: =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 01
> > Health: =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 063
> > Eccentricity: =A0 =A0 =A0 =A0 =A0 =A0 =A0 0.2546310425E-003
> > Time of Applicability(s): =A0589824.0000
> > Orbital Inclination(rad): =A0 0.9600353241
> > Rate of Right Ascen(r/s): =A0-0.7490598364E-008
> > SQRT(A) =A0(m 1/2): =A0 =A0 =A0 =A0 =A0 5180.309570
> > Right Ascen at Week(rad): =A0-0.1884143710E+001
> > Argument of Perigee(rad): =A0 2.479846239
> > Mean Anom(rad): =A0 =A0 =A0 =A0 =A0 =A0 0.1795769095E+001
> > Af0(s): =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0-0.9536743164E-005
> > Af1(s/s): =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 0.0000000000E+000
> > week: =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0621
> > --- =A0CHAS
> Do you know which vehicle (model, #) this is?

Yes, sorry for the brevity of my report.

It's GPS IIF-2 (SVN63) launched into Plane D from the Cape 16 July.
It's transmitting but set unusable during an expected thirty day
commissioning.

NORAD:

Catalog 37753
NAVSTAR 66 (USA 232)

International designation:

2011-036A

Currently, SVN63 is moving through Plane D. Its currently completing
1.974 orbits per day. GPS satellites typically complete 2.006 orbits
per day. So, expect positioning maneuvers during commissioning.

--- CHAS

Posted by Alan Browne on July 21, 2011, 1:01 pm
On 2011-07-21 12:35 , HIPAR wrote:
>>> PRN30 has been removed from the broadcast almanac.
>>> PRN01 has been included in the almanac:
>>> ******** Week 621 almanac for PRN-01 ********
>>> ID: 01
>>> Health: 063
>>> Eccentricity: 0.2546310425E-003
>>> Time of Applicability(s): 589824.0000
>>> Orbital Inclination(rad): 0.9600353241
>>> Rate of Right Ascen(r/s): -0.7490598364E-008
>>> SQRT(A) (m 1/2): 5180.309570
>>> Right Ascen at Week(rad): -0.1884143710E+001
>>> Argument of Perigee(rad): 2.479846239
>>> Mean Anom(rad): 0.1795769095E+001
>>> Af0(s): -0.9536743164E-005
>>> Af1(s/s): 0.0000000000E+000
>>> week: 621
>>> --- CHAS
>> Do you know which vehicle (model, #) this is?
> Yes, sorry for the brevity of my report.
> It's GPS IIF-2 (SVN63) launched into Plane D from the Cape 16 July.
> It's transmitting but set unusable during an expected thirty day
> commissioning.
> NORAD:
> Catalog 37753
> NAVSTAR 66 (USA 232)
> International designation:
> 2011-036A
> Currently, SVN63 is moving through Plane D. Its currently completing
> 1.974 orbits per day. GPS satellites typically complete 2.006 orbits
> per day. So, expect positioning maneuvers during commissioning.

Sounds like they've inserted it slightly high until it 'backs' into
position, then they'll burn a bit and drop it to the correct orbit and
potentially mix that with an effort to make the orbit more circular ( I
didn't look at the almanac to see if it was more elliptical, just seems
to make sense to combine maneuvers to conserve reactive mass for the future)

--
gmail originated posts filtered due to spam.

Posted by macpacheco on July 21, 2011, 12:07 pm
> PRN30 has been removed from the broadcast almanac.
> PRN01 has been included in the almanac:
> ******** Week 621 almanac for PRN-01 ********
> ID: =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 01
> Health: =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 063
> Eccentricity: =A0 =A0 =A0 =A0 =A0 =A0 =A0 0.2546310425E-003
> Time of Applicability(s): =A0589824.0000
> Orbital Inclination(rad): =A0 0.9600353241
> Rate of Right Ascen(r/s): =A0-0.7490598364E-008
> SQRT(A) =A0(m 1/2): =A0 =A0 =A0 =A0 =A0 5180.309570
> Right Ascen at Week(rad): =A0-0.1884143710E+001
> Argument of Perigee(rad): =A0 2.479846239
> Mean Anom(rad): =A0 =A0 =A0 =A0 =A0 =A0 0.1795769095E+001
> Af0(s): =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0-0.9536743164E-005
> Af1(s/s): =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 0.0000000000E+000
> week: =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0621
> --- =A0CHAS

Great !

Two questions:
1 - There's still a limitation of 31 Active PRNs (control segment
limited) ? If true, then PRN30 will be vacant until the next bird gets
decommissioned...
2 - Inclusion in the broadcast almanac doesn't imply activation of L-
band transmitters ?

Marcelo Pacheco

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