GPS approach
Thread Starter
Joined: Aug 2004
Posts: 164
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From: italy
GPS approach
Hi guys,
I'm new on these type of approaches!!
Somebody can explain me differences between:
Gps approach
Gnss approach
Rnp approach
Rnav approach
Rnp ar approach
Thanks very much for your help
Michelda
I'm new on these type of approaches!!
Somebody can explain me differences between:
Gps approach
Gnss approach
Rnp approach
Rnav approach
Rnp ar approach
Thanks very much for your help
Michelda
Joined: Oct 2009
Posts: 1,270
Likes: 0
From: UK
Hi michelda,
Gps approach = Approach using GPS satellites position updating (uses the USA System of Global Positioning Satellites)
Gnss approach = Approach using Global Navigation Satellite System (can use present GPS and the new European Galileo Sat Nav System of the future) (eg GNSS APP LGW 26L required accuracy = 0.3nm)
Rnp approach = Area Nav Approach using DME/DME, VOR/DME, or Satellite system for position updating with a position accuracy of "X". (X is usually 1 nm)
Rnav approach = Area Nav Approach as above - but not necessarily to the same required accuracy
Rnp ar approach = Not certain - think it might be the Arrival Procedure leading to the RNAV Approach.
Gps approach = Approach using GPS satellites position updating (uses the USA System of Global Positioning Satellites)
Gnss approach = Approach using Global Navigation Satellite System (can use present GPS and the new European Galileo Sat Nav System of the future) (eg GNSS APP LGW 26L required accuracy = 0.3nm)
Rnp approach = Area Nav Approach using DME/DME, VOR/DME, or Satellite system for position updating with a position accuracy of "X". (X is usually 1 nm)
Rnav approach = Area Nav Approach as above - but not necessarily to the same required accuracy
Rnp ar approach = Not certain - think it might be the Arrival Procedure leading to the RNAV Approach.
Joined: Sep 1998
Posts: 1,615
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From: wherever
Oh go on then.
Gps approach = Approach using GPS satellites position updating (uses the USA System of Global Positioning Satellites) Now being phased out and replaced by RNP APRCH
Gnss approach = Approach using Global Navigation Satellite System (can use present GPS and the new European Galileo Sat Nav System of the future) (eg GNSS APP LGW 26L required accuracy = 0.3nm)don't forget the Russian, Chinese and indian systems and see note above
Rnp approach = Area Nav Approach using DME/DME, VOR/DME, or Satellite system for position updating with a position accuracy of "X". (X is usually 1 nm)Includes RNP approach procedures and RNAV (GNSS-based) approach procedures designed with a straight segment, the accuracy normally being 0.3.
GNSS is the primary navigation service that supports RNP APCH procedures. The acceptability of the risk of loss of RNP APCH capability due to satellite failure or loss of onboard monitoring and alerting function must be considered during procedure design.
The missed-approach segment may be based on RNAV or conventional navigation procedure.
RNP APCH navigation specification does not include specific requirements for communication or surveillance.
Rnav approach = Area Nav Approach as above - but not necessarily to the same required accuracyObsolete term now being replaced by RNP
Rnp ar approach = Not certain - think it might be the Arrival Procedure leading to the RNAV Approach.An RNP approach procedure featuring special aircraft aircrew and approach procedure authorization by the regulatory authorities.
It normally applies to airports where there is complex terrain and limited airspace and requires accuracy normally between 0.3 and 0.1.
Only GNSS is the allowed to be the navigation source and achievable actual RNP precision shall be predicted.
The specification excludes specific communication and surveillance requirements.
Gnss approach = Approach using Global Navigation Satellite System (can use present GPS and the new European Galileo Sat Nav System of the future) (eg GNSS APP LGW 26L required accuracy = 0.3nm)don't forget the Russian, Chinese and indian systems and see note above
Rnp approach = Area Nav Approach using DME/DME, VOR/DME, or Satellite system for position updating with a position accuracy of "X". (X is usually 1 nm)Includes RNP approach procedures and RNAV (GNSS-based) approach procedures designed with a straight segment, the accuracy normally being 0.3.
GNSS is the primary navigation service that supports RNP APCH procedures. The acceptability of the risk of loss of RNP APCH capability due to satellite failure or loss of onboard monitoring and alerting function must be considered during procedure design.
The missed-approach segment may be based on RNAV or conventional navigation procedure.
RNP APCH navigation specification does not include specific requirements for communication or surveillance.
Rnav approach = Area Nav Approach as above - but not necessarily to the same required accuracyObsolete term now being replaced by RNP
Rnp ar approach = Not certain - think it might be the Arrival Procedure leading to the RNAV Approach.An RNP approach procedure featuring special aircraft aircrew and approach procedure authorization by the regulatory authorities.
It normally applies to airports where there is complex terrain and limited airspace and requires accuracy normally between 0.3 and 0.1.
Only GNSS is the allowed to be the navigation source and achievable actual RNP precision shall be predicted.
The specification excludes specific communication and surveillance requirements.
Joined: Mar 2011
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From: engineer at large
Quick rule of thumb..
RNP APCH: TF to TF legs only
RNP AR: TF-RF-TF legs
GPS and GNSS are synonymous... GPS is the name of the US based sat system...globally, it is called GNSS. Currently only GPS (US), GLONASS (Russia) are operational...Beidou (China), Galileo (EU), and IRNSS (India) are a long way off, perhaps by 2020.
Interestingly, in the GPS accuracy diagrams, I never paid attention to the outer band at 2200m accuracy, Omega. It wasnt until I visited the Omega Tower, at about 1400feet,the tallest structure in the Southern Hemisphere, in AUS, did that click....
RNP APCH: TF to TF legs only
RNP AR: TF-RF-TF legs
GPS and GNSS are synonymous... GPS is the name of the US based sat system...globally, it is called GNSS. Currently only GPS (US), GLONASS (Russia) are operational...Beidou (China), Galileo (EU), and IRNSS (India) are a long way off, perhaps by 2020.
Interestingly, in the GPS accuracy diagrams, I never paid attention to the outer band at 2200m accuracy, Omega. It wasnt until I visited the Omega Tower, at about 1400feet,the tallest structure in the Southern Hemisphere, in AUS, did that click....
Thread Starter
Joined: Aug 2004
Posts: 164
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From: italy
Thanks very much for your replies.
Another question......
FSIA (seychelles) Rnav(gnss) rwy 13
Rnav (rnp) rwy 13
EDDM (frankfurt) Rnav (gps) rwy 07C
An airline must be authorized for flying these procedure? (entry in AOC certificate)
Do you use same procedures when you fly these approaches?
Michelda
Another question......
FSIA (seychelles) Rnav(gnss) rwy 13
Rnav (rnp) rwy 13
EDDM (frankfurt) Rnav (gps) rwy 07C
An airline must be authorized for flying these procedure? (entry in AOC certificate)
Do you use same procedures when you fly these approaches?
Michelda
Joined: Mar 2011
Posts: 1,407
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From: engineer at large
Not sure what to make of the RNAV (GNSS) RW13 approach to FSIA....didnt find one called "RNP" to compare. (was looking for RNP AR...)
For all intensive purposes, this would be RNP APCH, but an offset approach. with a min of 1870', I would not use this as an example of what to do....
RW31 has a straight in ILS approach, yet the RNAV GNSS is offset as well..
Is this a Jepp design?
For all intensive purposes, this would be RNP APCH, but an offset approach. with a min of 1870', I would not use this as an example of what to do....
RW31 has a straight in ILS approach, yet the RNAV GNSS is offset as well..
Is this a Jepp design?
Joined: Mar 2001
Posts: 4,563
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From: I wouldn't know.
Hmm, weird one. The RNAV (GNSS) Y 13 has on the LIDO map a note that says Straight-In Not Authorized. 1870 is of course only the minimum for a very low GA gradient, shown as circling minimum on the LIDO chart. Since there is a RNAV (RNP) Z 13 approach available which has a 410' minimum that would be my first choice. It requires an RNP of 0.15 and is only available between 5° and 46° C.
Joined: Mar 2011
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From: engineer at large
Concur,
not sure why the offset...I didnt find the RNP track with Jepp, so not sure why it is so different from the GPS track, if it is...so not knowing that I just looked at the 2.5 missed number.
Same with 31, straight in ILS, but offset GPS.....what does LIDO show on this?
not sure why the offset...I didnt find the RNP track with Jepp, so not sure why it is so different from the GPS track, if it is...so not knowing that I just looked at the 2.5 missed number.
Same with 31, straight in ILS, but offset GPS.....what does LIDO show on this?
Joined: May 2006
Aviation Qualifications: CPL
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From: Australia
PBN: what happens when the French get involved with RNP....
A relevant comment considering what they are currently trying to do to the BARO-VNAV criteria......seems a "change it because you don't understand it" mentality applies
Joined: Jun 2001
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From: Australia
As an aside....
The description above does not apply to all countries. In some, the RNP specification excludes satellite-only based position fixes. Satellite fixing as part of a full FMS installation is fine, of course.
The description above does not apply to all countries. In some, the RNP specification excludes satellite-only based position fixes. Satellite fixing as part of a full FMS installation is fine, of course.
Guest
Joined: Apr 2009
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From: On the Beach
Oktas8:
ICAO has, thus far, adopted the U.S. criteria (FAA Order 8260.52) for RNP AR IAPs. The qualification process is quite rigorous and contained in a separate advisory circular (AC 90-101A). (Both the criteria Order 8260.52 and AC 90-101A are posted on the FAA's website.)
In addition to GPS position a minimum of one IRU is required for extraction in the event of a failure of GPS. This is not required to operate to RNP 0.30 minimums so long as the missed approach does not require RNP of less than 1.0 (telescoping missed approach).
As a practical matter thus far all aircraft approved for minimums of less than RNP 0.30 (to as low as RNP 0.10) and/or missed approaches of RNP less than 1.0 all have triple IRUs because the airplanes were designed for oceanic.
Also, RNP AR requires a lot more than GPS and IRUs. The FMS and flight computer redundancy is far greater than with "ordinary" RNAV. TAWS is mandatory as well. Thus, the integrity, alerting, and monitoring is quite rigorous and necessary to achieve a target safety factor of E10-7 that 2XRNP will not be breached.
As an aside....
The description above does not apply to all countries. In some, the RNP specification excludes satellite-only based position fixes. Satellite fixing as part of a full FMS installation is fine, of course
The description above does not apply to all countries. In some, the RNP specification excludes satellite-only based position fixes. Satellite fixing as part of a full FMS installation is fine, of course
In addition to GPS position a minimum of one IRU is required for extraction in the event of a failure of GPS. This is not required to operate to RNP 0.30 minimums so long as the missed approach does not require RNP of less than 1.0 (telescoping missed approach).
As a practical matter thus far all aircraft approved for minimums of less than RNP 0.30 (to as low as RNP 0.10) and/or missed approaches of RNP less than 1.0 all have triple IRUs because the airplanes were designed for oceanic.
Also, RNP AR requires a lot more than GPS and IRUs. The FMS and flight computer redundancy is far greater than with "ordinary" RNAV. TAWS is mandatory as well. Thus, the integrity, alerting, and monitoring is quite rigorous and necessary to achieve a target safety factor of E10-7 that 2XRNP will not be breached.
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From: Al's Diner
As a practical matter thus far all aircraft approved for minimums of less than RNP 0.30 (to as low as RNP 0.10) and/or missed approaches of RNP less than 1.0 all have triple IRUs because the airplanes were designed for oceanic.
Guest
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From: On the Beach
Denti:
As I said only one IRU is required. And, as a practical matter most presently authorized RNP AR airplanes have 3 IRUs.
Yup, the NG is certified for RNP 0.10 as standard level with only two IRS. And for GNSS based CAT I approaches, CAT IIIb is currently in the testing phase.