United States Department of Transportation
[PDF-2.50 MB]
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Corporate Publisher:
-
Abstract:This report treats the design of naviggation systems that collect data from two or more on-board measurement subsystems and precess this data in an on-board computer. Such systems are called Multi-sensor Navigation Systems.
The design begins with the difinition of the design requirements and a list of n sensors and c omputers. A Design Procedure is then developed which automatically performs a systematic evaluation of the (sn-1) x c candidate systems that may be formed. This procedure makes sensor sampling limits, data processing constraints, relative computer loading, and environmental distrubances. The performance of the system is determined by its terminal navigation uncertainty and dollar cost. The Design Procedure consits of three design options, three levels of evaluation, and a set of auxiliary data. By choosing from among the design options and the auxiliary data, the designer can tailor the Design procdure to his paricular application.
A design option is develped to answer each of the three following questions: (1) Which candidate system meets the system accuracy specification and has the lowest system cost? (2) For each sensor or computer chain, which is defined as the set of all systems containing that component, what is the system that satifies the accuracy requirements and has the lowest cost? (3) Whic systems satify the design accuracy requirements?
The system evaluation is accomplished using one optimal and two non-optimal technique obtains approximate values of the system's accuracy by assuming measurement schdules that do not satisfy the processing constraint.
The procedure is applicable to a large class of air or space missions for which a nominal trajectory can be defined. To illustrate how the procedure would be used, the design of an aircraft navigation system for operation in the NE corridor is presented. This problem considers the confiuration of a system starting with four candidate sensors and threee candidate computers. The outputs from all three design options are presented and discussed.
-
Format:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type:
