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Methods and systems for distinguishing arinc 743 from arinc 743a protocols

a technology of arinc 743 and protocol, applied in the field of methods and systems for distinguishing arinc 743 from arinc 743a protocols, can solve the problems of adversely affecting avionic devices, and improper scale of outputted gps data

Active Publication Date: 2008-03-20
HONEYWELL INT INC
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  • Claims
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Benefits of technology

[0003]The present invention provides an apparatus and method for automatically adjusting for data protocol discrepancies. The apparatus includes a unit that receives a signal from GPS receiver. The signal is formatted according to a transmission protocol. The unit includes a fir

Problems solved by technology

However, if the GPS installation has been upgraded to use the ARINC 743A protocol, but the GPS installation is still reporting itself as using the ARINC 743 protocol, the outputted GPS data is improperly scaled.
Improperly scaled FOM data can adversely affect avionic devices, such as an Enhanced Ground Proximity Warning System (EGPWS).

Method used

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  • Methods and systems for distinguishing arinc 743 from arinc 743a protocols
  • Methods and systems for distinguishing arinc 743 from arinc 743a protocols
  • Methods and systems for distinguishing arinc 743 from arinc 743a protocols

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Embodiment Construction

[0010]FIG. 1 illustrates a block diagram of an example environment 18 formed in accordance with an embodiment of the present invention. The environment 18 includes a plurality of satellites 22 and an aircraft 20 having a Global Positioning System (GPS) receiver 28 and a Terrain Awareness Warning System, such as an Enhanced Ground Proximity Warning System (EGPWS) 26 or another system that uses GPS information received by the GPS receiver 28 from the plurality of satellites 22. In one embodiment, the EGPWS 26 includes an automatic adjustor 30.

[0011]The automatic adjustor 30 analyzes the data sent from the GPS receiver 28 and scales certain GPS data if it determines there is a discrepancy between the expected protocol from the GPS receiver 28 and the actual protocol used to transmit the data. More specifically, the auto adjustor 30 uses Figure of Merit (FOM) information and Dilution of Precision (DOP) data for the Horizontal channel to back compute User Equivalent Range Error (UERE). A...

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Abstract

An apparatus and method for automatically adjusting for data protocol discrepancies. The apparatus includes a unit that receives a signal from GPS receiver. The signal was formatted according to a transmission protocol. The unit includes a first component that estimates User Equivalent Range Error (UERE) based on the received signal and adjusting at least one value of the received signal based on the estimated UERE and one or more predefined scale factor and a second component that uses the adjusted at least one value.

Description

BACKGROUND OF THE INVENTION[0001]Global Positioning Systems (GPS) units transmit GPS data using the Aeronautical Radio, Inc (ARINC) 743 or 743A protocols. These protocols are nearly identical except for the scaling of the Figure of Merit (FOM) terms. Currently, avionics system require the GPS installation (unit) to specify which type of ARINC protocol is used. However, if the GPS installation has been upgraded to use the ARINC 743A protocol, but the GPS installation is still reporting itself as using the ARINC 743 protocol, the outputted GPS data is improperly scaled. Improperly scaled FOM data can adversely affect avionic devices, such as an Enhanced Ground Proximity Warning System (EGPWS).[0002]Therefore, there is a need to easily and cheaply determine the protocol type of GPS data.BRIEF SUMMARY OF THE INVENTION[0003]The present invention provides an apparatus and method for automatically adjusting for data protocol discrepancies. The apparatus includes a unit that receives a sign...

Claims

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Application Information

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IPC IPC(8): G01S5/14G01S19/15G01S19/09G01S19/20G01S19/23
CPCG01S19/09G01S19/23G01S19/20G01S19/15
Inventor CONNER, KEVIN J.JOHNSON, STEVE C.ISHIHARA, YASUO
Owner HONEYWELL INT INC
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