Wednesday, December 6, 2017

Project Paper 792 - Dec 2017 Update


Project Paper 792 System
Flat-Panel antennas, particularly those with embedded amplifiers, provide the only pathway from an effective 18" aperture from a typical multi-gimbal antenna to as much as a 42" aperture.   The first of these new antennas is the Gogo 2Ku made by ThinKom.

Project Paper 792 provides the form and fit of these second-generation satcom systems building on the baseline from ARINC 791 part 1 and using a common functional definition using ARINC 791 part 2 and Project Paper 848.

Friday, November 17, 2017

Comparing Antenna Performance

While it is possible to get 2x as marketing touts, the ThinKom (2Ku) antenna achieves about 1.5 times the spectral efficiency as a competing 2-axis antenna along typical routes. The ThinKom antenna may perform even better in the tropics, where the elevation angles may be highest.

The ThinKom antenna can operate without any performance reduction due to skew angles that may be encountered in the tropic regions, unlike a 2-axis antenna which may suffer severe degradation.

Theoretically, these same benefits await other flat-panel antennas.  Practically, no other antenna has  made public, legitimate claim to a design matching instantaneous bandwidth, efficiency, robustness, and scan loss, in the same size package.  VICTS weakness is cost, weight, form-factor; all of which electronic phased array may have advantage. 

Monday, November 13, 2017

Defense in Depth


Defense-in-Depth is a security concept that applies successive barriers to unauthorized access.  Aeronautical communication includes a Commercial-off-the-Shelf (COTS) layer, a Network layer, and an Application layer.

Friday, October 27, 2017

Space Shuttle Approach and Landing Test Program

Robert (Bob) Montgomery participated in the Space Shuttle Approach and Landing Test program, conducted by NASA Dryden at Edwards in 1977.  A Boeing Aerodynamicist, Bob conducted wind tunnel test to develop the control modifications as a result of carrying the Space Shuttle, and devised procedures so it could be safely separated.

Monday, October 23, 2017

Google Loon - Floating Nest of Radio Technologies

Google is deploying a High Altitude Platform System (HAPS) in the form of balloons that float around 20 km in altitude above a service area.  Representative link budgets for both the LTE service and the air-ground unlicensed feeder link show that one balloon can deliver about 10 Mbps uplink and 20-25 Mbps downlink, on average, to LTE subscribers in an 80 km coverage area.

Saturday, September 2, 2017

Managing Network Security and QoS: PP848

Air Transport Airplanes are faced with a monumental challenge to upgrade and embrace modern IP radio networks.  Network security has risen mightily to challenge designers, mire down operations, and yet struggles to achieve its goal.  Bandwidth management - Quality of Service - is done piece-meal, blind to real priority and performance goals.  What will bring this all together?

Friday, September 1, 2017

“Otto”, your new First Officer

Will air transport airplanes carrying many people for commercial purposes move to fully autonomous, no human pilot onboard? 

The First Officer will turn into “Otto”, a built-in feature of the next generation air transport airplane, and that the Captain is here to stay.   This is a logical progression from four to three (no Navigator) to two (no Flight Engineer) to one (no First Officer.)

Thursday, August 31, 2017

Antenna Performance along an Airline Route

Aircraft fly from a departure airport to a destination airport along a route that is ideally a great circle connecting the two airports.  Weather and other aircraft traffic, along with other considerations, can lead an airplane across a range of territory when flying the route from day to day.

Airplanes inherently favor flying wings-level while not maneuvering (as opposed to a slip.)  This leads to greatest passenger satisfaction and can avoid troubling issues with fluids.  As a result, the orientation of the airplane changes with respect to satellites operating along the geostationary orbit (GSO). The relative orientation between satellite and antenna leads to beam steering (azimuth, elevation, polarization skew) commands and also has an influence upon the airplane antenna performance.

Skew angle and Elevation angle from various satellite positions, flying Los Angeles to Sao Paulo, Multi-gimbal antenna

Wednesday, August 30, 2017

Choosing an Airline Wireless Internet Service Provider (WISP)

Airlines have been providing passengers radio communication services at their seat since 1937. 

In 2017, airline passengers yearn for free and compelling Wi-Fi Internet access. What should an airline consider when choosing an inflight Wireless Internet Service Provider (WISP)?

Monday, April 17, 2017

Spectral Efficiency - The Fitness of Wireless Communication

Spectral efficiency –the effective data rate that can be achieved from a given slice of spectrum. 

Saturday, April 8, 2017

Designing B-47 Maneuvers

The B-47 was the first swept-wing bomber. Boeing aerodynamicist Robert (Bob) Montgomery stopped by Pease AFB and briefed emerging maneuvers possible with the B-47.

Friday, March 17, 2017

Tom Kraft - Final Clearance

Tom Kraft and Dave Allen share a beer moments after FANS was first certificated by the FAA (1995). 
Not pictured were Tom Twiggs (Boeing project pilot) and 
David Massey-Greene (QANTAS Chief Technical Pilot) on the other end of the table.
Sadly all four are gone
Tom Kraft died yesterday in an accident, at his home looking out on Hood Canal. His tragic passing comes less than a year after retiring from a 30+year career at the FAA, leading air traffic control into the digital age.

Saturday, March 11, 2017

Project Paper 848 Draft 1 Released - Secure Broadband IP Air/Ground Interface (SBAGI)



Draft 1 of ARINC Project Paper 848: Secure Broadband IP Air-Ground Interface (SBAGI) has been released by the AEEC Network Infrastructure and Security (NIS) Subcommittee for industry comments.

Monday, January 23, 2017

TK295, URSS Sochi Runway 02, Sep 27 2016 TC-JLP A319 ATC Intervention in Go-Around

There is a difference in the reported actions (turn left) and the flightradar24.com data (turn right) after commencing a particular missed approach at Sochi in Sep, 2016.  The FR24 data offers a climbing right turn, whereas avherald depicts a left turn direct.  

Friday, January 20, 2017

Monday, January 16, 2017

TK6491 747-400F MyCargo/ACT Airlines, Manas Airport (FRU/UCFM) in Bishkek

Did a false glide slope lead TK6491 astray?  Never have heard of this before.
A 747-400F cargo plane with 4 crew crashed near Manas Airport, in a residential area just past runway 26 at about 07:18 local time (2017 01 16 0117Z).  All aboard and 35 on the ground perished.

Wednesday, January 4, 2017

SU1008 UMKK/KGD Kalingrad A321 VP-BES Runway 24 Departure

An Aeroflot A321departed runway 24 at UMKK Kanlingrad on Jan 03 2017 20:54.

Weather reports include forecast medium braking in wet snow, poor visibility, low ceilings with thunderstorms in the area, and a heavy crosswind.  The airplane ended up on the right side of the runway, about 5,500 feet from the runway threshold.  The crosswind was from the right, so the airplane deviated into the crosswind.

Runway 24 is 8202 feet long at 31 feet MSL.

flightradar24,com ADS-B data for SU1008

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