EUROCAE ED-88 PDF

PURPOSE AND SCOPE

The Minimum Operational Performance Specification is designed to ensure that airborne receiving equipment approved as complying with it, will be compatible with the ICAO Standards and Recommended Practices in respect of Microwave Landing System (MLS) and Instrument Landing System (ILS) localiser and glide path functions.

This Minimum Operational Performance Specification is also designed to ensure that any incorporated airborne GPS receiving equipment will be compatible with the technical specification for GPS as defined in the document "GPS Standard Positioning Service - Signal Specifications" and in "Technical characteristics of the Navstar GPS", obtainable from SMC/PA 2430, El Segundo Blvd, Suite 4049, LOS ANGELES AFB, CA90245-4687, USA.

This Minimum Operational Performance Specification specifies the particular operational performance requirements applicable to airborne receiving systems with ILS, MLS and GPS functions incorporated within a single equipment. The requirements of this document shall be met by a combined ILS/MLS/GPS receiver when operating in either one of two mutually exclusive modes (ILS/MLS) in addition to the GPS, if included.

A receiver meeting the requirements of this document shall be capable of operating in either ILS or MLS mode and at the same time performing GPS position determination, if GPS is included.

In addition to meeting the requirements of this document, a combined ILS/MLS/GPS receiver shall fully meet the minimum operational performance requirements of EUROCAE ILS, MLS and GPS MOPS when operating in the appropriate mode. Several specific requirements of ED-46B/ED-47B (ILS), ED-36A (MLS) and ED-72A (GPS) are referenced in this document.

The inclusion of ILS, MLS or GPS functions in the receiver is optional. If any function is not present, all the appropriate paragraphs in this document refering to that function may be disregarded.

Mandatory clauses are noted by "shall".

Environmental test requirements have been specified in respect of the parameters which may be particularly susceptible to the effects of environment. Although this document provides a single minimum performance standard for receivers, several alternative environmental categories, as specified in EUROCAE ED-14C/RTCA DO-160C may exist. Those categories applicable to the conditions over which the equipment is declared to operate shall be applicable.

Demonstration of compliance with certain of the requirements of this specification may involve somewhat complex test procedures, e.g . where a scalloping of input signal is required or where performance in the presence of interfering signals is to be demonstrated. Suitable test procedures in respect of these requirements are contained in the appropriate EUROCAE MOPS and are referenced in Chapter 5. Alternative procedures providing equivalent integrity may be used.

This document provides minimum performance specifications for the airborne portion of the MLS, ILS and GPS. Should the MLS, ILS and GPS functions be incorporated into multifunction equipment with additional navigation functions, the requirements of this specification must be met when operating as an MLS or ILS and GPS receiver. The appropriate EUROCAE MOPS shall be used to define the operational performance of the additional function(s) to be incorporated.

This minimum specification does not require the provision of guidance information decoded from the MLS back azimuth ground system. The receiver must be capable of providing all guidance and data information as specified in this document whether or not MLS back azimuth is provided in the ground installation.