C L A S I F I C A T I O N
Enhanced Position Location Reporting System
(EPLRS) Positioning Capability
Gary Fielke
数据库招聘信息>jboss默认端口Electronic Warfare and Radar Division
Defence Science and Technology Organisation
DSTO-TN-0762
ABSTRACT
The Enhanced Position Location Reporting System (EPLRS) is a  network of wireless tactical radios that distributes digital data between many mobile users. In addition, EPLRS has a position reporting capability allowing mobile users to determine their position based on time difference of arrival measurements from multiple reference radio units.
EPLRS has the potential to be used in Unmanned Aerial Vehicles as a navigation system backup to GPS. This report details a number of EPLRS position tests conducted at DSTO Edinburgh and the outcome of these tests with a view to UAV usage.
APPROVED FOR PUBLIC RELEASE
position和location的区别DSTO-TN-0762
Published by
Defence Science and Technology Organisation
PO Box 1500
Edinburgh South Australia 5111
Telephone: (08) 8259 5555
Fax: (08) 8259 6567
© Commonwealth of Australia 2007
AR-013-931
June 2007
APPROVED FOR PUBLIC RELEASE
Enhanced Position Location Reporting System
(EPLRS) Positioning Capability一键上的网站
EXECUTIVE SUMMARY
The Enhanced Position Location Reporting System (EPLRS) is a  network of wireless tactical radios that distributes digital data between many mobile users. EPLRS also has a position reporting capability allowing mobile users to determine their position based on time difference of arrival measu
rements from multiple reference radio units.
A series of EPLRS position tests were conducted in and around the DSTO Edinburgh site. Using up to 5 EPLRS reference units with good reference station geometry resulted in an average bias of 32 ± 27 m. With poor reference station geometry, the average bias increased to 60 ± 61 m, although this was based on a very small data set. Due most likely to building obscuration and multipath, there were a number of inconsistencies in the positioning results.
The EPLRS position reporting capability has the potential to be used as a backup to GPS, in such platforms as Unmanned Aerial Vehicles (UAVs). An EPLRS Micro-Light unit has been used in a UAV for extending tactical communication range and could be utilised for position determination also.
Integrating the EPLRS position solution into the avionics of the UAV will allow switching between GPS and EPLRS for the source of position data depending on the environment and system requirements. This option could allow navigation of the UAV in a GPS-denied environment or whilst deploying GPS denial payloads.
Contents
ACRONYMS vii
冒泡排序原理及例子
1.INTRODUCTION 1
2.EPLRS 1
2.1Introduction 1
2.2Position Location 3
2.3Position Data 3
2.4Gumstix 3
3.EPLRS POSITION TESTS AND RESULTS 5
3.1Tests 5
3.2Results 7
3.3Gumstix Test 8
3.4Results Summary 9
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3.5Operational Issues 9
4.SUMMARY 10
5.ACKNOWLEDGEMENTS 11
6.REFERENCES 11
APPENDIX A:EPLRS POSITION PLOTS 12
Table 1: EPLRS Test Results 7
Figure 1: Vehicle Mounted and Micro-Light EPLRS 2
Figure 2: EPLRS Micro-Light installed in UAV 2
Figure 3: Gumstix Module 4
Figure 4: Proposed Air-to-Ground Communications over EPLRS for EPLRS Position 5
Figure 5: EPLRS Reference Unit sites (S1-5) and Mobile Unit sites (V1-3) 6
DSTO-TN-0762
Figure 6: EPLRS and Gumstix Test Setup 8 Figure 7: V1 EPLRS Position Error with 5 reference units (1 of 2) 12 Figure 8: V1 EPLRS Position Error with 5 reference units (2 of 2) 13 Figure 9: V1 EPLRS Position Error with 4 reference units 14 Figure 10: V1 EPLRS Position Error with 3 reference units 15 Figure 11: V2 EPLRS Position Error with 5 reference units 16 Figure 12: V3 EPLRS Position Error with 5 reference units 17 Figure 13: 4 km offset EPLRS Position Error with 5 reference units 18 Figure 14: 4 km offset EPLRS Position Error with 4 reference units 19 Figure 15: 4 km offset EPLRS Position Error with 3 reference units 20 Figure 16:Dynamic Tests with 5 reference RS units 21

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