EMALS & JPALS for the JSF

Back to the quotes above/now previous page for minute quotes: [why would not EXPEDITIONARY be similar to CVN JPALS?]

"...can control up to 50 airplanes with one system out to 20 nm...."
&
"...The system would be able to manage 50 different aircraft making different approaches within a radius of 20nm...."
&
for CVN bubbas: "...at 60nm the jet automatically logs into the JPALS queue, receiving more precise data while beginning two-way data-link communication. At 10nm the pilot starts receiving precision data for landing, following visual cues to land on an exact spot...."
&
"...JPALS ground components can be set up within 90 minutes and can offer pilots 50 different possible approaches at multiple airfields within a radius of 20 nautical miles...."

Less salt air.

Back to the quotes above/now previous page for minute quotes: [why would not EXPEDITIONARY be similar to CVN JPALS?]

"...can control up to 50 airplanes with one system out to 20 nm...."
&
"...The system would be able to manage 50 different aircraft making different approaches within a radius of 20nm...."
&
for CVN bubbas: "...at 60nm the jet automatically logs into the JPALS queue, receiving more precise data while beginning two-way data-link communication. At 10nm the pilot starts receiving precision data for landing, following visual cues to land on an exact spot...."
&
"...JPALS ground components can be set up within 90 minutes and can offer pilots 50 different possible approaches at multiple airfields within a radius of 20 nautical miles...."

I didn't think they wanted to pack an extra receiving antenna (they were not small) and a receiver.

Did not notice that 'shore based' notation earlier. However another recent quote says: [any idea of date of your SLIDE?]

"...The mobile version for land applications is based on a single Humvee with four GPS antennas and four UHF antennas...." [how many thingamejigs does the USAF need - it has been demonstrated and will be demonstrated again]

This article about 'the four boxes' seems to not have been posted - so here 'tis: [Perhaps there is a 5th case with aerials? https://www.raytheon.com/news/feature/rtn_jpals ] No one mentions number of aerials or their size neva.

Raytheon, for the first time, performs complete JPALS expeditionary setup and demo
17 May 2019 Pat Host

"Key Points
• Raytheon performed a setup & demonstration of its JPALS expeditionary variant for 1st time during the week of 6 May
• The company eventually wants to demonstrate the system with multiple runways and multiple approaches

Raytheon demonstrated, for the first time, a complete setup and execution of its Joint Precision Approach and Landing System (JPALS) expeditionary variant during the week of 6 May.

A pair of demonstrations took place over two days at Naval Air Station Patuxent River, Maryland, using US Navy (USN) Lockheed Martin F-35C Lightning II Joint Strike Fighter (JSF) aircraft carrier variants. On the first day, Raytheon took JPALS from “zero” to fully operational in 70 minutes.

CJ Jaynes, Raytheon executive technical adviser for precision landing, told Jane’s on 15 May that this included opening the JPALS transit cases, rolling out and setting up GPS antennas, activating the system, aligning it with satellites, and then landing the aircraft.

On the second day, the company set up the system and demonstrated it in 50 minutes. Jaynes said Raytheon usually advertises that JPALS expeditionary can be set up in 60–90 minutes, as even if a user minimised the time required to unpack the system, waiting for the satellites to sync takes the longest amount of time.

JPALS is an all-weather landing system based on differential GPS for land-based and sea-based aircraft, according to the USN. JPALS works with GPS to provide accurate, reliable, and high-integrity guidance for fixed- and rotary-wing aircraft.

The system features anti-jam protection to ensure mission continuity in hostile environments. JPALS is a differential GPS that will provide an adverse weather precision approach and landing capability."

Photo: "Raytheon plans to perform its second demonstration of its Joint Precision Approach Landing System (JPALS) expeditionary version in late 2019/early 2020. Pictured is the system in transit cases. (Raytheon)" [“four avionics racks each 1.5 m tall by 0.8 m wide” https://www.janes.com/article/82763/upd ... als-system ] https://www.janes.com/images/assets/614 ... 734354.jpg

Source: https://www.janes.com/article/88614/ray ... p-and-demo

Then from RAYTHEON hisself comes this 17 Oct 2018 PDF: https://www.raytheon.com/sites/default/ ... _Final.pdf (1.7Mb)

ASLO: http://raytheon.mediaroom.com/2019-04-0 ... ing-system

JPALS Test Aboard USS Abraham Lincoln [CV night landing stress quote] 10 Oct 2018
https://www.youtube.com/watch?v=ey4qs-8TjfY

ScreenGrab: Pilot Lookin' Left at IFLOLS just before arrest - wot a good lad is he.

"F-35 flight approach (prior to trapping) during sunset. Photo by Jeffrey M Sherman" https://www.raytheon.com/sites/default/ ... 6-3302.jpg (1Mb)

ANTENNA doan look too big in this 2002 JPALS ARKYtexture PDF page graphic (of course the PDF is no longer with us):

http://acast.grc.nasa.gov/wp-content/up ... allace.pdf [no see other antennae anywhere]

A pair of demonstrations took place over two days at Naval Air Station Patuxent River, Maryland, using US Navy (USN) Lockheed Martin F-35C Lightning II Joint Strike Fighter (JSF) aircraft carrier variants. On the first day, Raytheon took JPALS from “zero” to fully operational in 70 minutes.

Pax River is not exactly an austere airfield with challenging terrain. It appears the demo was directed at that last 10NM and the precision auto-land.

Not sure where that leaves the human element in validating approaches but deconfliction might not be automatic.

This is challenging terrain: (good place for an airdrop, setup and demo in 90 minutes)

:devil: ANTENNA doan look too big in this 2002 JPALS ARKYtexture PDF page

'cuz you ain't got no frame of reference

From what I've found the newer ground based versions look to have a much smaller antenna.

Thanks to both for the info. Challenging terrain. Sea Level CVN at sea? Cool Cool Cool. Sweetness. Is there a reference URL & date for the boxes/antennae please. Yeah wot about that latest infographic claim?

"60 NAUTICAL MILES (APPROXIMATELY) Jet will automatically log into the JPALS queue, receiving more precise data while beginning two-way data-link communication." https://www.raytheon.com/sites/default/ ... _Final.pdf (1.8Mb)

Did not notice that 'shore based' notation earlier. However another recent quote says: [any idea of date of your SLIDE?]

"...The mobile version for land applications is based on a single Humvee with four GPS antennas and four UHF antennas...." [how many thingamejigs does the USAF need - it has been demonstrated and will be demonstrated again]

As one may imagine their is a lot of JPALS material around the net because it has been going for nearly two decades. The graphics (usually in PDF briefing notes) show all kinds of variations particularly in the shore base. The example noted earlier, saying 'one way data broadcast' is dated Dec 2009 from this PDF example (not available to plebs however it can be attached if required). Front page has this note "This material has been cleared for Public Release by 66ABW/PA; 30 November 2009; Case # 66ABW-2009-1342 Portions approved for Public Release by NAVAIR PR; 21 January 2009 ; Case # SPR 09-917.213; Portions approved for Public Release by MITRE; 30 November 2009; Case # 09-5104; Distribution is Unlimited" TITLE is: Land-Based JPALS Industry Day 8-10 December 2009 http://insidedefense.com/index.php?opti ... 0096_1.pdf (1.4Mb)

I'll guess that 'perhaps' the land based specifications have changed as per the most recent PDF from RAYTHEON cited. ???

Next PDF with the 'one way swimmer' notation is attached & dated June 2008 with some 'different' land based info:

JPALS Program Overview June 2008 CDR Brett Easler, USN
Chief of Naval Operations N885F1; Naval Air Systems Command PMA2135
http://www.jpdo.gov/library/20080618All ... Easler.pdf (not available now of course)

This PDF has a 'deployed man pack prototype' as pictured with an antenna similar to one portrayed recently here.

My guess is that RAYTHEON have developed a better LAND JPALS on their own initiative (considering ARMY/USAF dropped out earlier) so that land/expeditionary JPALS is better than the old land specification, hence two way data link as per:

download/file.php?id=30718 [original Raytheon PDF date Oct 2018]

I could be wrong here, I've only been on the cockpit side as a user of a LAAS based system and not real interested in the nuts and bolts, but to address why only an uplink for expeditionary....

I would think the priority for what is uplinked are the differential GPS refinements to the aircraft GPS receiver position to achieve the stated accuracy. This is what the aircraft mission computer/FMS uses for navigation and displays for the pilot in a map format of some type, as well as steering commands (manual or auto-pilot) to the more precise track. For a ground based system, I'm not sure why there would necessarily be a downlink requirement for something, unlike the boat, that is not constantly changing position. This is only where navigation is concerned.

Of course, there's lots of other useful data which can be uplinked/downlinked between the aircraft and the ground based fixed system, something of the nature of the civil CPDLC system which can be used for communicating with and sequencing and separating traffic, with a format for cockpit display. I can see the desirability of having something like this incorporated into the expeditionary system, particularly in challenging areas where you're fortunate enough to find one way in, let alone 50. Or where Wx precludes the use of certain arrival options.

'ADS-B In' (Automatic Dependent Surveillance-Broadcast) can provide a sophisticated cockpit display view of traffic in the area also with some separation/deconfliction capability, and has probably advanced in quality and capability since I last fooled with it in a cockpit environment. With the F-35's fancy systems for SA, it may not need this, but for other more vanilla aircraft, F-16, V-22, C-130, helos, etc that use JPALS they may need some avionics and display upgrades of this nature. Even the airlines were somewhat lukewarm to this option however, due to $$$....cost of retro-fit.

Just give me an old ADF.

Bah, JPALS is for pussies! Nothing beats opening the canopy and felling the wind on the face!

(disclaimer: The above is a joke)