Top-Rated Free Essay
Preview

Acars Via Iridium

Satisfactory Essays
701 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Acars Via Iridium
ACARS via Iridium Iridium is a large satellite constellation that consists of 66 low-earth orbiting (LEO), cross-linked satellites operating as a fully meshed network providing truly global coverage (including oceans, airways and polar regions). Iridium satellites are in a near-polar orbit at an altitude of 485 miles. The network is composed of 66 active satellites that fly in six orbital planes, each with 11 satellites per plane. Satellites circle the earth once every 100 minutes. ACARS is an Aircraft Communication Addressing and Reporting System otherwise known as Digital DataLink System. ACARS was first developed in the 1970’s. It is a point-to-point service that either sends air-to-ground messages or receives ground-to-air messages from the cockpit. ACARS via Iridium now gives Flight Departments the capability to communicate with the aircraft in their fleet all over the globe. ACARS is now a viable option via Iridium. Until now ACARS was only available by 2 different mediums. ACARS via Very High Frequency (VHF) communication is only available through line of site. ACARS via Inmarsat (Satcom) is only available over the populated continents and does not provide communications over polar routes. The cost of Iridium service is far less than that of Satcom and is available over oceans whereas VHF is not. This allows aircraft to access various services provided by ACARS Service Providers. Aircraft can now send a number of automatic reports (OOOI, engine oil pressure, position reports, fuel, and etc) using ACARS via Iridium. Pilots can request relevant information pertaining to flight safety and receive necessary in-flight updates. Some of the data services include: Text-based and Graphical Weather, Flight Planning and Clearances, Text Messaging, Position Reporting, Automatic Terminal Information Services (ATIS), Terminal Weather Information for Pilots (TWIP), and OOOI messages (Out of the gate, Off the ground, On the ground, and Into the gate). New flight safety services such as Controller Pilot Data Link Communications (CPDLC) and Future Air Navigation System messaging (FANS) are currently undergoing live tests to help improve flight times and routes for Air Transportation. Typical ACARS messages are only 100 to 200 characters in length. Such messages are made up of a one-block transmission from (or to) the aircraft, constrained to be no more than 220 characters within the body of the message. Iridium’s Short Burst Data Service (SBD) has the network transport capability to transmit short data messages between field equipment and a centralized host computing system. ACARS blocks are 238 bytes maximum; segmenting and distributing them across multiple SBD messages is not necessary. Each ACARS block is encapsulated in a unique SBD message. ACARS requires ARINC-429 Interface, compliant with ARINC 741 characteristics for satellite communication systems. Standardized nature of the ARINC 429 digital data bus allows Satcom Data Unit (SDU) to interface with wide variety of ACARS capable hardware. Air-to-ground messages are originated from the Control Display Unit (CDU), which is located in the cockpit of the aircraft. The pilot will initiate his request through the CDU, where the Data Management Unit (DMU) will pass the ACARS requested message onto the Iridium Satcom Data Unit (SDU). The SDU encapsulates each ACARS block into an SBD message and sends the SBD message to the Iridium gateway. The SBD messages are received by the Iridium gateway, converted back into ACARS blocks, then passed on to the chosen DataLink Service Provider (DSP) through the service provider gateway. Conversely, ground-to-air messages from the data provider are passed through the service provider gateway as ACARS message blocks. Once received by the Iridium gateway, they are encapsulated as SBD messages and delivered to the aircraft. Once the SDU has received an uplink SBD message, it removes SBD-specific information and passes the remaining data to the DMU as an ACARS message block via the ARINC 429 data bus. The DMU then interprets and displays the ACARS data via the CDU. ARINC (Aeronautical Radio, Incorporated) and SITA (Society of International Telecommunications Aeronautics) are the two DSPs available to the airlines. ACARS messaging allows the airlines to identify abnormal flight conditions and automatically send real-time messages to an airline, thereby enabling airlines to improve their aircraft performance.

You May Also Find These Documents Helpful

  • Powerful Essays

    It 242 Final Project

    • 1213 Words
    • 5 Pages

    Now with Satellite communications it will let the company have long distance network communication and connectivity. There will be LAN’s at each location which will best benefit with a Cat-5 which will support 100BaseTx which will allow for a fast Ethernet network able to get speeds of up to 100Mbps. This allows for packet switching, latency, and there channel capacity will be more proficient. The packet switching will allow for optimized use of the channel capacity available in digital telecommunication networks. With packet…

    • 1213 Words
    • 5 Pages
    Powerful Essays
  • Good Essays

    The Global Positioning System involves the use of transmission of at least 4 radio wave signals from a "constellation" of 24 earth-orbiting satellites at one time.…

    • 654 Words
    • 3 Pages
    Good Essays
  • Good Essays

    It 242 Week 8 Assignment

    • 686 Words
    • 3 Pages

    Satellite signals are similar to microwave which require a direct line of sight to ensure proper transmission. Satellites require that a satellite is in geosynchronous orbit of the earth and receiver must be locked on satellites orbit at all times to maintain connection. Satellites can cover large areas since they are in high orbit they can relay signals through other…

    • 686 Words
    • 3 Pages
    Good Essays
  • Powerful Essays

    ET2530 Research Paper

    • 1184 Words
    • 4 Pages

    The role of satellite networks in global communications is growing at an unprecedented pace. From direct broadcast satellite (DBS) television, to satellite phones, to credit card transactions, to the Internet, corporations and consumers are embracing these new services and placing demands on bandwidth. With this demand have come expectations in terms of basic service costs, hardware costs, and ease-of-use. These expectations have forced the industry to examine its traditional ways of operating in order to make satellite services as accessible and convenient as its terrestrial competitors.…

    • 1184 Words
    • 4 Pages
    Powerful Essays
  • Powerful Essays

    IT 205 week 2

    • 482 Words
    • 2 Pages

    These are the little divices that help you send or receive information but do not have all the components…

    • 482 Words
    • 2 Pages
    Powerful Essays
  • Powerful Essays

    36th CAB Commo SOP Draft

    • 11184 Words
    • 57 Pages

    (1) Advanced System Improvement (ASIP) Single Channel Ground and Airborne Radio System (SINCGARS) is a FM frequency hopping secure radio. The BDE HQs operates three nets to maintain communications with the DIV HQs: DIV CMD, O&I, and A&L nets. The BDE HQs also maintains communications with adjacent unit HQs over these nets and subordinate unit HQs on the BDE CMD, O&I, A&L nets, and monitors adjacent and subordinate unit nets as required. During ground movement ASIP SINCGARS is the primary means of communication. Retransmission is primarily a function of the maneuver battalion and may require augmentation by C/449 as the Brigade signal company.…

    • 11184 Words
    • 57 Pages
    Powerful Essays
  • Good Essays

    While as emails, texts ,faxes, letters will be used for any other inquiries like tech meetings, trainings and if a piece of equipment needs repairing. Also spreadsheets are used as a communication method by providing information like stock level of…

    • 512 Words
    • 3 Pages
    Good Essays
  • Powerful Essays

    The Navy Multiband Terminal (NMT) Program is the next generation maritime military satellite communications terminal. The NMT Program is the required Navy component to the Advanced Extremely High Frequency (AEHF) Program for enhancing protected and survivable satellite communications to Naval forces. NMT multiband communication capabilities will communicate via two way Ka-Band on Wideband Global Satellite Communication (SATCOM) (WGS) and shipboard and submarine terminals to communicate with X-Band using the Defense Satellite Communications System (DSCS) and WGS. NMT will operate in the Extremely High Frequency (EHF)/AEHF Low Data Rate (LDR), Medium Data Rate (MDR), and Extended Data Rate (XDR) communication modes and will sustain the Military Satellite Communication (MILSATCOM) architecture by providing connectivity across the spectrum of mission areas to include land, air and naval warfare, special operations, strategic nuclear operations, strategic defense, theater missile defense, and space operations and intelligence (1). The NMT system will replenish and improve on the capabilities of both the Military Strategic and Tactical Relay (MILSTAR) system and WGS system by equipping the warfighters with assured, jam resistant, secure communications. The AEHF system will provide crosslinks within the constellation as well as between AEHF satellites and MILSTAR satellites in the backwards-compatible mode. Mission requirements specific to Navy operations, including threat levels and scenarios, are contained in the AEHF ORD. NMT will be a FORCEnet enabler by providing critical protected bandwidth for war fighter information services (3).…

    • 2130 Words
    • 9 Pages
    Powerful Essays
  • Satisfactory Essays

    Communication satellites work non-stop 24 hours a day to keep the entire world linked together. Until recently NASA had been the only one's launching satellites, but now many private companies are benefiting from what a satellite can do. Once a satellite becomes geosynchronous, rotates with the earth orbit, a satellite is ready to work. It then beams messages to a ground station, the ground station receives these messages by using a device called a transponder. Which interrupts the message and then distributes it. By doing this satellite stations can than transport telephone service, data, or television transmissions to almost anywhere. These communication satellites are used for things like an overseas phone call or beaming 150 channels into your living room.…

    • 694 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    The London Ambulance Service (LAS) is world’s largest free ambulance service covering an area of more than 600 square miles with a population of 7 million people. On any given day, LAS transported more than 5,000 patients and handled more than 2,000 telephone calls. LAS employed over 2,700 people, including an operational staff of roughly 2,000 people.…

    • 587 Words
    • 3 Pages
    Good Essays
  • Better Essays

    Space Race Research Paper

    • 1983 Words
    • 8 Pages

    Satellites have benefited our everyday lives. "Communication satellites are responsible for instantaneous television coverage of events all over the globe, for the speed of international banking and finance, for the almost-immediate delivery of vast amounts of information, and for international e-mail and telephone service to all parts of the Earth." ("Neal 186") When a person watches television, the television is sent from the station to a satellite and to a local provider. Without satellites, a person would be able to only watch local stations, but with satellites a person can watch a television program from anywhere in the world, talk to anyone, or even send e-mail.…

    • 1983 Words
    • 8 Pages
    Better Essays
  • Good Essays

    * Shipment tracking: This allows users to establish an account and obtain real-time information about cargo shipments. They may also create and submit bills of lading, place a cargo order, analyze charges, submit a freight claim, and carry out many other functions. In addition, customers can track shipments down to the individual product and perform other supply chain management and decision support functions. The application uses encryption technology to secure business transactions.…

    • 923 Words
    • 4 Pages
    Good Essays
  • Powerful Essays

    Srs for Online Job Portal

    • 1872 Words
    • 8 Pages

    The purpose of this document is to describe all external requirements for online job portal. It also describes the interfaces for the system.…

    • 1872 Words
    • 8 Pages
    Powerful Essays
  • Satisfactory Essays

    mashawer case study

    • 386 Words
    • 2 Pages

    1. What kinds of applications are described in this case? What business functions do they support?…

    • 386 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    VANET Analysis

    • 813 Words
    • 4 Pages

    The OBU is mainly comprised of a resource command processor (RCP), and resources include a read/write memory employed to save and retrieve information, a user interface, a specific interface to connect with the other OBUs and a network device for short-range wireless communication on the basis of IEEE 802.11p wireless technology. The OBU connects to the RSU or to other OBUs via a wireless link and is held accountable for the communications among the other OBUs or with the RSUs. It can also accommodate a transmission service to the AU and transmits data in place of other OBUs on the network. The foremost purposes of the OBU in VANET are wireless radio access, ad-hoc and geographical routing, network jam control, secure information transmissionand information…

    • 813 Words
    • 4 Pages
    Good Essays