Technical Provisions for Mode S Services and Extended Squitter

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DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris (x) Technical Provisions for Mode S Services and Extended Squitter Comm-C. A 112-bit interrogation containing the 80-bit MC message field. This field is used by the uplink extended length message (ELM) protocol. Comm-D. A 112-bit reply containing the 80-bit MD message field. This field is used by the downlink ELM protocol. Data link capability report. Information in a Comm-B reply identifying the complete Mode S communication capabilities of the aircraft installation. Downlink. A term referring to the transmission of data from an aircraft to the ground. Mode S air-to-ground signals are transmitted on the 1 090 MHz reply frequency channel. Frame. The basic unit of data transfer at the link level. A frame can include from one to four Comm-A or Comm-B segments, from two to sixteen Comm-C segments, or from one to sixteen Comm-D segments. General Formatter/Manager (GFM). The aircraft function responsible for formatting messages to be inserted in the transponder registers. It is also responsible for detecting and handling error conditions such as the loss of input data. Ground Data Link Processor (GDLP). A ground-resident processor that is specific to a particular air-ground data link (e.g., Mode S) and which provides channel management, and segments and/or reassembles messages for transfer. It is connected on one side (by means of its data circuit terminating equipment (DCE)) to ground elements common to all data link systems, and on the other side to the air-ground link itself. Ground-initiated Comm-B (GICB). The ground-initiated Comm-B protocol allows the interrogator to extract Comm-B replies containing data from one of the 255 transponder registers within the transponder in the MB field of the reply. Ground-initiated protocol. A procedure initiated by a Mode S interrogator for delivering standard length (via Comm-A) or extended length (via Comm-C) messages to a Mode S aircraft installation. Horizontal Integrity Limit (HIL). The radius of a circle in the horizontal plane (i.e., the plane tangent to the WGS-84 ellipsoid), with its center being the true position, which describes the region which is assured to contain the indicated horizontal position. Draft Horizontal Protection Limit (HPL). The radius of a circle in the horizontal plane (i.e., the plane tangent to the WGS-84 ellipsoid), with its center being the true position, which describes the region which is assured to contain the indicated horizontal position. Note. — The terms HPL and HIL (Horizontal Integrity Limit) are used interchangeably in various documents. Mode S broadcast protocols. Procedures allowing standard length uplink or downlink messages to be received by more than one transponder or ground interrogator, respectively. Mode S packet. A packet conforming to the Mode S subnetwork standard, designed to minimize the bandwidth required from the air-ground link. ISO 8208 packets may be transformed into Mode S packets and vice versa. Mode S Specific Protocol (MSP). A protocol that provides a restricted datagram service within the Mode S subnetwork. Mode S specific services. A set of communication services provided by the Mode S system which are not available from other air-ground subnetworks and therefore not interoperable. Packet. The basic unit of data transfer among communications devices within the network layer (e.g., an ISO 8208 packet or a Mode S packet). DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris Glossary (xi) Required Navigation Performance (RNP). A statement of the navigation performance accuracy necessary for operation within a defined airspace. Segment. A portion of a message that can be accommodated within a single MA/MB field in the case of an SLM, or a single MC/MD field in the case of an ELM. This term is also applied to the Mode S transmissions containing these fields. Standard Length Message (SLM). An exchange of digital data using selectively addressed Comm-A interrogations and/or Comm-B replies. Subnetwork. An actual implementation of a data network that employs a homogeneous protocol and addressing plan and is under the control of a single authority. Timeout. The cancellation of a transaction after one of the participating entities has failed to provide a required response within a pre-defined period of time. Traffic information service — broadcast (TIS-B). The principle use of TIS-B is to complement the operation of ADS-B by providing ground-to-air broadcast of surveillance data on aircraft that are not equipped for 1090 MHz ADS-B OUT as an aid to transition to a full ADS-B environment. The basis for this ground surveillance data may be an air traffic control (ATC) Mode S radar, a surface or approach multilateration system, or a multi-sensor data processing system. The TIS-B ground-to-air transmissions use the same signal formats as 1090 MHz ADS-B and can therefore be accepted by a 1 090 MHz ADS-B receiver. Uplink. A term referring to the transmission of data from the ground to an aircraft. Mode S ground-to-air signals are transmitted on the 1030 MHz interrogation frequency channel. Vertical Protection Limit (VPL). The vertical geometric position integrity containment region defined by the vertical distance centered on the reported vertical position within which the true vertical position lies. _____________________ Draft DRAFT - Working Paper ASP TSGWP11-01 for review by the TSG during the meeting in June 2011 in Paris
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