摘要:

ABSTRACTA technique known as SERIES (Satellite Emission Range Inferred Earth Surveying), is a method by which radio signals from artificial satellites already in earth orbit can be exploited for positioning and navigation. The existing satellites of choice are those of the Global Positioning System (GPS). The SERIES technique makes it possible to perform simultaneous pseudo ranging to multiple NAVSTAR‐GPS satellites without knowledge of the codes usually required to make use of these satellites. The accuracy achievable with the SERIES system in a dynamic environment is at the meter level when operated in a differential mode with a single base station which may be several hundred km away. To achieve real time operation, it is necessary to cross‐link the base station receiver output to the dynamic vessel which determines its position and velocity relative to the geodetic position of the base. The demands upon the cross‐link communications are very modest at an average rate of only one byte per second. Since the technique has no requirement for a knowledge of the GPS codes, it is possible to use both of the P‐code channels at L1 and L2 to accomplish the ionospheric calibrations which are essential for achieving one meter accuracy over distances of several hundred kilometers. The conditions under which the SERIES technique will function are compatible with all civilian needs but are not useful in military operations because of electronics‐countermeasures already developed.By the use of a pair of receivers on a single vessel, it is possible to configure an angular orientation measurement system using the NAVSTAR satellites as the frame of reference and with an accuracy of 0.1 degree or better without any mov

ISSN:0028-1522    

DOI:10.1002/j.2161-4296.1984.tb00862.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

ABSTRACTFiber‐optic gyroscopes hold the potential of lower unit manufacturing costs and high reliability resulting from the lack of moving parts. Fiber gyroscopes have been proposed for a number of navigation, guidance and control system applications.The basic principles of operation and the various mechanizations of fiber‐optic gyroscopes will be covered. The state of the art in fiber optic gyroscopes will be reviewed in terms of elimination of errors. The additional developments required to achieve fiber‐optic gyroscopes suitable for strapdown applications will be exp

ISSN:0028-1522    

DOI:10.1002/j.2161-4296.1984.tb00863.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

ABSTRACTDiscussed is a timing emulation and operating system which predicts loading for microprocessors and enables efficient generation of software found in such applications as the Global Positioning System. The timing emulator is applied to two classes of user equipment, a conventional fast‐multiplexed design and a fully integrated processor featuring continuous state feedback into the spread‐spectrum demodulation and tracking loops. Timing data are developed for five representative microprocessors ranging from 8/8 to 32/32 register/bus widths. The advanced integrated processor requires augmentation of the 32/32 processor with a math coprocessor. The emulator is used to develop speed requirements on the co‐processor. Lastly, the software development system is described. This contains a multi‐tasking operating system and matrix library written in the language “C” which may be easily adapted to a range of radio‐naviga

ISSN:0028-1522    

DOI:10.1002/j.2161-4296.1984.tb00864.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

ABSTRACTAs the NAVSTAR Global Positioning System (GPS) begins moving beyond the initial development stage, potential air navigation users are going to have a considerable range of choices for set designs. This paper describes three of the main receiver architecture approaches: multichannel, sequential, and multiplex (MUX). These major options are compared according to functional capabilities, effects of dynamics on navigation accuracy, and relative cost. Oscillatorg‐loading effects are addressed. The most appropriate choice for a given military or civil air navigation application likely involves a judicious combination of the various basic set architectures. A general familiarity with NAVSTAR/GPS is assume

ISSN:0028-1522    

DOI:10.1002/j.2161-4296.1984.tb00865.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

ABSTRACTThis paper describes the Joint Tactical Information Distribution System (JTIDS) Navigation Function and the Global Positioning System (GPS), emphasizing their technical similarities and differences. Based on these, the paper discusses the operational benefits, performance, and design approaches for combining the navigational and time data from these two systems. Both JTIDS and GPS are time synchronous, spread spectrum systems which provide high accuracy navigation data through the use of time‐of‐arrival measurements and pseudo‐ranging techniques. Both are subject to Geometric Dilution of Precision (GDOP) effects, though under different conditions; and both are highly resistent to interference, though to different degrees. JTIDS is more a tactical or local system, while GPS is global in nature. Exchanging data between the two systems, under certain constraints, therefore has the potential of great performance and operational benefits with respect to system availability, under a variety of operational scenarios and interference conditions. These benefits and proposed methods for combining the data from the two systems are described in the

ISSN:0028-1522    

DOI:10.1002/j.2161-4296.1984.tb00866.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

ABSTRACTThe GPS User Equipment is being designed for use on various platform types (aircraft, surface ships, submarines, land vehicles and manpack) with the integrated components of the user equipment (UE) being developed as separate modules. GPS UE can be integrated on board a platform to varying levels. The system enhancements available to the individual platform are dependent on the complement of GPS UE selected and the degree to which it is being integrated onto the platform. This paper describes the GPS UE capability options available to aircraft platforms. The capability options are described as generic options (i.e., not specific to any aircraft). For each option, three topics are addressed: the benefits, possible equipment configuration and implementation issues. These topics are addressed independent of particular aircraft.

ISSN:0028-1522    

DOI:10.1002/j.2161-4296.1984.tb00867.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

ISSN:0028-1522    

DOI:10.1002/j.2161-4296.1984.tb00868.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY