EMALS & JPALS for the JSF

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spazsinbad

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Unread post20 May 2021, 04:45

Navy Declares IOC for Joint Precision Approach and Landing System
19 May 2021 Seapower Staff

"PATUXENT RIVER, Md. – The U.S. Navy declared initial operational capability for the Joint Precision Approach and Landing System (JPALS) on May 4, signaling the system is ready to provide precision approach and landing capabilities to tactical carrier aircraft at sea in support of naval aviation operations worldwide, the Naval Air Systems Command said in a May 18 release....

...The initial operational capability (IOC) was declared by Rear Adm. Gregory Harris, director, Air Warfare Division, N98, Office of the Chief of Naval Operations, following the successful installation, integration and flight certification of the first JPALS production unit aboard USS Carl Vinson (CVN 70) in December 2020. After the flight certification, the JPALS team continued working with the Navy’s operational test community to demonstrate that the F-35C could effectively conduct at-sea precision approaches to the flight deck, and that adequate manning, training and sustainment infrastructure were in place to support and sustain JPALS operations while globally deployed. The JPALS IOC declaration is the culmination of many years of system development and testing activities that began in 2008....

...JPALS has been supporting F-35B deployments on LH-class amphibious assault ships with an early operational capability since 2016, and will now provide the all-weather, precision navigation, approach and landing capability for all F-35C deployments on CVNs as well. JPALS will also support future operations with the Navy’s unmanned MQ-25A Stingray aboard CVNs."

Source: https://seapowermagazine.org/navy-decla ... ng-system/
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Unread post26 May 2021, 04:53

General Atomics EMALS and AAG Systems Aboard Ford Reach Over 8,000 ‘Cats and Traps’ Milestone
25 May 2021 Seapower Staff

"SAN DIEGO — General Atomics Electromagnetic Systems (GA-EMS) announced in a May 24 release that the Electromagnetic Aircraft Launch System (EMALS) and Advanced Arresting Gear (AAG) system aboard the USS Gerald R. Ford (CVN 78) achieved the Navy’s target of 8,000 successful aircraft launches and recoveries during the ship’s 18-month post-delivery test and trial (PDT&T) period.

“The last 18-months have been very exciting and challenging. We are proud of the record number of critical “firsts” EMALS and AAG achieved during this period to bring the systems into real-time operational readiness,” said Scott Forney, president of GA-EMS. “Navy leadership set a clear goal of completing 8,000 catapult launches and arrestments during PDT&T. EMALS and AAG met and exceeded that goal with a 100% safety record.”..."

Photo: "An F/A-18F Super Hornet, assigned to Air Test and Evaluation Squadron (VX) 23, lands on USS Gerald R. Ford’s (CVN 78) flight deck in early 2020. Ford was conducting aircraft compatibility testing to further test its Electromagnetic Aircraft Launch Systems (EMALS) and Advanced Arresting Gear (AAG). U.S. NAYV / Mass Communication Specialist Seaman Jesus O. Aguiar" https://seapowermagazine.org/wp-content ... anding.jpg (1.4Mb)


Source: https://seapowermagazine.org/general-at ... milestone/
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madrat

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Unread post26 May 2021, 13:16

Sounds like they got a lot of the kinks worked out.
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Unread post02 Jun 2021, 20:40

in this thread post page 25 is a PDF: download/file.php?id=29728 (PDF 85Kb) about first ACLS landing/history: viewtopic.php?f=22&t=14115&p=413050&hilit=automatic#p413050

[ http://www.tsretirees.org/memory/Femiano.doc ] [NO LONGER THERE SO above 2 PDF page at URL made from .DOC]

GIF from Naval Aviation News Nov 1957 below: https://www. history.navy. mil/research/histories/naval-aviation-history/naval-aviation-news/back-issues/ 1950/1957/november.html
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Unread post21 Jul 2021, 16:38

Raytheon’s JPALS System Operational On Two Aircraft Carriers
21 Jul 2021 Martin Manaranche

"The Joint Precision Approach and Landing System, also known as JPALS, made by Raytheon Intelligence & Space, a Raytheon Technologies business, is now deployed on two international platforms. JPALS system operational on the UK’s QNLZ and Italy’s Cavour. Raytheon Intelligence & Space press release

The system will be used to perform joint operations with the U.S. Marine Corps aboard the UK Royal Navy’s HMS Queen Elizabeth. It is also installed on the ITS Cavour, an Italian aircraft carrier, the flagship of the Marina Militare, to support their F-35 squadron.

JPALS, a differential GPS precision landing system, guides aircraft onto carriers and amphibious assault ships in all weather and surface conditions. The system is being deployed on all U.S. Navy aircraft carriers and amphibious assault ships. All F-35 aircraft are equipped with JPALS capability, and the system is currently being used on the F-35B and F-35C.

“The Cavour JPALS is the first system to be permanently installed on a foreign ship.” “JPALS will add significant mission capabilities for our international allies and partners who are flying the F-35.”
Denis Donohue, vice president of Communications & Airspace Management Systems at Raytheon Intelligence & Space.


The system has completed flight testing and Category I and II certifications in preparation for deployments.

Photo: "Raytheon Intelligence & Space picture." https://www.navalnews.com/wp-content/up ... System.jpg


Source: https://www.navalnews.com/naval-news/20 ... -carriers/
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steve2267

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Unread post21 Jul 2021, 17:12

If GPS goes down, I probably won't be able to find my way to the corner store no'more. :doh:

Will Lightnings still be able to land? I do not recall backup modes for JPALS being discussed anywhere. Shirley must have some alternate means to help the Lightnings back in the bottle? Differential, ground (sea) based GPS from one (possibly more) ships?
Take an F-16, stir in A-7, dollop of F-117, gob of F-22, dash of F/A-18, sprinkle with AV-8B, stir well + bake. Whaddya get? F-35.
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Unread post21 Jul 2021, 17:27

:doh: :mrgreen: BOYoBOYoBOY. Someone needs to read up on JPALS. :devil: :drool:
Landing guidance with pinpoint accuracy https://www.raytheonintelligenceandspac ... ucts/jpals
"Joint Precision Approach and Landing System, or JPALS, is a software-based, high-integrity differential GPS navigation and precision approach landing system that guides aircraft onto carriers and amphibious assault ships in all weather and surface conditions. It uses an anti-jam encrypted datalink to communicate between the aircraft and an array of GPS sensors, antennas and shipboard equipment...."

Precision without precedent
https://www.raytheonintelligenceandspac ... -precedent

Expeditionary JPALS: Delivering Precision Landing Capabilities Anywhere
https://www.youtube.com/watch?v=pPi-X1QRDyI

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steve2267

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Unread post21 Jul 2021, 17:47

What happens if the GPS satellite constellation goes down or is seriously degraded? Is eJPALS able to operate autonomously -- separate from the satellite constellation?

Shirley must have asked this question?

But I see no mention of such a capability in the cute promo vids and brochures.

Differential GPS implies using the GPS satellite constellation. Yet if I have four known geo-positions (mo bettuh), whose location coordinates I know with high precision, possibly in a different (local) coordinate system, I can see how the maths would enable me to determine XYZ and V of landing objects. Then I leverage the GPS hardware for my own navigational devices.
Take an F-16, stir in A-7, dollop of F-117, gob of F-22, dash of F/A-18, sprinkle with AV-8B, stir well + bake. Whaddya get? F-35.
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Unread post21 Jul 2021, 17:51

Within 200 nautical miles of a ship the SHIPBORNE GPS provides the coverage required to increasing accuracy when close.

Outside the GPS constellation of satellites is used to get within that SHIPBORNE coverage. There is now a new military GPS constellation of less hackable saddleITES (yes I know). So there is that. You would have to read this thread methinks?

GPS Block III https://en.wikipedia.org/wiki/GPS_Block_III [scroll down for Military M-CODE]
&
https://news.satnews.com/2021/06/17/spa ... 5-june-17/

Page 1 this thread: download/file.php?id=13298 & download/file.php?id=13287

Page 2 dis dread: download/file.php?id=14765

Page 5 da thred: download/file.php?id=17478

Image
Image
Image
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Unread post21 Jul 2021, 18:24

Obviously an enema could try to hack GPS satellites or the GPS system, or jam their signals. I do believe these threats are taken seriously and have been and continue to be addressed. I am thinking in terms of GPS satellites -- the constellation itself, being physically attacked / degraded / destroyed. Likely? Probably not. Possible? I think so. I am thinking anti-satellite weapons, nukes, sharks with friggin lazerbeams (ok, well not sharks).

If the satellites stop working (for whatever reason), can eJPALS still function?
Take an F-16, stir in A-7, dollop of F-117, gob of F-22, dash of F/A-18, sprinkle with AV-8B, stir well + bake. Whaddya get? F-35.
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Unread post21 Jul 2021, 18:33

I have not kept up with the EXPEDITIONARY JPALS for the LAND aircraft - there is info about this aspect in this forum - look for 'expeditionary'. I'll guess aircraft can pickup the 'datalinks' at some range to land but at 0330 here I have had it.
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Unread post21 Jul 2021, 18:39

If the satellites stop working (for whatever reason), can eJPALS still function?


from page 30:

outlaw162 wrote:Without the satellites, it doesn't matter what boxes they have on the CVN or the ashore installation....no JPALS.

And yes, it would not be easy to take out (disrupt) the required number of satellites to make the constellation useless, they're way up high in the sky......but evidently someone thinks this is or will be possible in the future. :shock:

Always good to have a Plan B, then C, then D etc. etc.


also from page 30:

spazsinbad wrote:
outlaw162 wrote:No GPS -> no JPALS, encrypted or not. SF-PALC concept is not so much re-inventing the wheel, but seems to be more in the category of thinking outside the box the wheel comes in. I think they may be thinking in terms of SAT killers....but no worries, we now have the vaunted Space Force. Anyway back to my fallout shelter....ah I can hear "Waltzing Matilda" on the hand cranked turntable now. :D

I think you missed the relative GPS from the ashore installation similar to the CVN broadcast. I'll guess this is not easily disrupted but then 'what do I know'. Shirley whatever box JPALS is in there is a breakout function that will be demoed.


Ah, optimism based on belief.....

page 29:

The system must also be able to be setup and operated in a GPS-denied environment, says the USAF....

Interesting. This could imply a concept like the old TLS (Transponder Landing System). The TLS also has off-axis runway approach capability, but I don't believe it's capable of curved RF (radius-to-fix) turn approaches like GPS, so that last turn to lineup takes a bit of finesse. The big limitation is you can only have one aircraft at a time on the approach, but the advantage is no GPS required and ILS-equivalent accuracy. And it's basically self contained between the aircraft and ground facility with a single transponder code involved.

We did a number of simulator tests (day and night) on TLS around 2008 to see what combinations of off-axis angle and distance from threshold to establish wings level were optimum for transport category, using the most adverse winds and austere runway lighting. I'm sure a fighter aircraft type would allow increased off-axis angle and decreased distance from the threshold to intersect the centerline combos. Might actually be a good fit, and it can also be aligned with the runway CL if terrain conditions permit.
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Unread post21 Jul 2021, 22:57

Salute!

I gotta see the Ops Requirement that dictates use of GPS. As with others here, we know the GPS sats can and will be prime targets for any peer or near-peer adversaries. Differential GPS is harder to implement than a very precise ILS system. Just look at the Space X landings on a barge! I do not think they are using GPS except to backup the booster's original inertial alignment and subsequent nav position. Get close and then use the beacon on the barge, huh? Easy peasey.

I simply cannot unnerstan a system that can be dramatically improved upon an encrypted TACAN or similar that is based on the CV or another member of the task force. That will get you very close to the boat and then you intercept an encrypted ILS sort of system that is inertially stabilized to provide a very accurate glide path and centerline ( not inertial position in Earth coordinates, but ones on the boat you are going to land on - that sucker becomes the center of the universe in all respects). Sheesh, we are talking 1960's technology that is relatively immune to GPS interference by the enema and can be carried withya anywhere.

We could also use a space stabilized laser homing system with detector or transmitter on either platform. Very secure and accurate.

Oh well, guess you have to have a long program and mucho $$$ to develop, test and field a system that can be spoofed easily once the balloon goes up.

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Unread post22 Jul 2021, 02:55

Some may recall my complaints earlier about my 'internet access being slow betimes' - this is a time and it is slow, slow.

Nice to see USAF has alternatives to JPALS & problematic saddleITES (yes I know). When the sky is falling with broken GPS satellites then I guess not much matters because the USN carriers will be SUNK also - therefore no need for JPALS eh. Meanwhile when GPS III saddelTights (yes I know) are online then not only will the F-35C be able to 'eyes closed arrest in sea state 5' but also the MQ-25A. IF NO DECK then off to find the nearest USAF/other airfield if possible notwithstanding.
Portable, Rapid-Install Precision Lander Enables Remote Operations
19 Sep 2019 Inside GNSS

"...M-Code Receivers:
In August of this year [2019], Raytheon received security certification for new GPS modules and receivers from the GPS Directorate. The new modules and receivers give military aircraft, ships, ground vehicles and weapon systems secure and reliable access to modernized GPS.

Raytheon’s military-code common GPS module was certified, along with its ground-based GPS receiver, or GB-GRAM, and the avionics GPS receiver, or GRAM-S/M. GB-GRAM and GRAM S/M are jointly developed with Trimble Inc., while General Dynamics provides cryptographic capabilities for the modules.... JPALS will be modified once M-Code comes on line."

Source: https://insidegnss.com/portable-rapid-i ... perations/
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Unread post22 Jul 2021, 06:03

To take out JPALS would be an impractical task. You're not going to get close enough to jam it, and navigation satellites fly too high for ASAT missiles.
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