15
TUESDAY 13TH MARCH For full conference programme and abstracts, visit the Oceanology website.
NAVIGATION AND POSITIONING
CHAIRED BY: ED DANSON, C&C TECHNOLOGIES LOCATION: SOUTH GALLERY, ROOMS 7/8
AM SESSION 09:15
09:30– 10:00
PM SESSION
Introduction Ed Danson
Keynote address
Nick Ward, The General Lighthouse Authorities of the UK & Ireland 1. Brief history of the development of Navigation & Positioning 2. Present situation, focussing on GNSS and DGNSS, looking at the advantages and disadvantages of those technologies. 3. The international provision of positioning services will be described, from both public and commercial sources. 4. The developments taking place in the maritime sector will be summarised, in particular e-Navigation and the growth of offshore renewables, together with their possible effects on the requirements for and provision of positioning services.
10:00– 10:30
Solar Activity and the effect on positioning systems
Sebastian Schäfer, Norwegian Mapping Authority The ongoing increase of solar activity has a major impact on the performance of global satellite navigation and positioning systems. The main threat is a degraded signal quality due to disturbances in the atmosphere and ionosphere of the Earth. This paper summarizes the solar processes influencing the near-earth space and reviews their general impact on navigation and positioning systems. Furthermore, an example case study, based on data from the Real-Time-Ionosphere-Monitor (RTIM) of the Norwegian Mapping Authority, will be presented illustrating the correlation between the increased solar activity and the measured positioning errors of an RTK network.
10:30– 11:00
Use of GNSS based real-time tidal information in offshore survey applications
David Russell, Technical Sales Manager, VERIPOS High accuracy positioning has been used in the offshore community for several years and is typically based on the precise point positioning (PPP) technique which can deliver accuracies at the decimetre level or better. This has opened up the possibility of using GNSS systems to detect and estimate the variations of the actual sea level from mean sea level which results in a real-time tide observation. This paper will explore the use of PPP for real time tide determination and will present data collected in actual offshore operations showing typical performance that can be achieved.
11:00 – 11:30
11:30– 12:00
Break & Exhibition Dynamic calibration of navigation sensors using GNSS Technology
John Vint, Fugro Surve y AS Over the years there has been a requirement to calibrate navigation (heading and motion) sensors on vessels working in the offshore oil industry and these calibrations are normally required by the oils companies prior to commencement of a project. Historically these calibrations were undertaken using traditional land survey techniques and very labour intensive, but today with a wealth of GNSS satellites, receivers and software the calibration process can be streamlined. This paper covers the techniques and accuracies related to applying GNSS technology to a traditional project task.
12:00– 12:30
AIS for advanced maritime operations
Cato Eliassen, Kongsberg Seatex AS Maritime operations have become more and more complex and several specialised vessels might be involved in the same operation. Cooperation requires communication. Frequencies are difficult to obtain. AIS is a system that became mandatory for all SOLAS vessels in 2004 and has dedicated frequencies for exchange of data between vessels. The system has capabilities outside only exchange of navigational data. Utilisation of the system such as transmission of automatic warnings to approaching vessels and virtual AIS AtoN transmissions reduces the burden on the involved vessels and ensures safer operations.
12:30– 14:00
Lunch & Exhibition
16:00– 16:30
15:00– 15:30
14:30– 15:00
14:00– 14:30
Model-Based Positioning
Valentina Zeiger, University of Kiel Generally, underwater positioning and navigation is a rapidly growing field of research since information about the current position of an underwater object like a diving robot or a marine mammal is very useful for a wide variety of applications. Presently, most acoustic underwater positioning systems use the straight path assumption to determine the distances between transmitter and receiver, e.g. between an underwater vehicle and a surface buoy. This means that distances are calculated from the estimated travel time of an acoustic signal and the speed of sound, which is often assumed to be constant. However, sound waves typically do not follow a straight line through the water due to refraction. Therefore, the estimated distances may differ significantly from the true distances, i.e., the straight path assumption is a major error source concerning acoustic underwater positioning. In this paper, a model-based positioning approach is proposed, which takes into account the acoustic ray bending caused by refraction.
Operational benefits of SPRINT for subsea positioning
Mark Carter, Sonardyne International Ltd SPRINT (Subsea Precision Reference Inertial Navigation Technology) is an acoustically aided inertial navigation system for subsea vehicles. SPRINT provides significant benefits for subsea vehicle positioning: • Extends the operating limits of Ultra-Short BaseLine (USBL) – vendor independent • Improves operational efficiency of Long BaseLine (LBL) • Near continuous output rates • Resilient to acoustic effects such as aeration, noise and Multipath • Uses existing fit ROV sensors (DVL / Depth Sensor) • Reduces operational time and vessel costs • Integrates with ROV station keeping • Effectively zero risk of data loss Results from various offshore projects will be presented showing the benefits of SPRINT being used ‘in the field’.
Improved Safety of Integrated Navigation and Positioning Systems
Tom Ryno, C&C Technologies Inc. This paper describes the technical benefits of building an integrated marine navigation or positioning system around a highly accurate inertial reference sensor. An accurate and stable positioning system requires three key components: heading, motion, and position. An integrated system allows for improved results because most of the timing errors can be removed. Using accurate gyros and accelerometers at the center of the system can provide extended dead reckoning time with predictable accuracies. The INS at the center of this type of system can be added with different positioning sensors such as GNSS, acoustics, or relative position sensors. This paper will discuss the benefits of integrating INS with different positioning sensors and the performance enhancements that can be expected.
Break & Exhibition
New functionality and improved performance of an integrated INS/DGNSS attitude, heading and position sensor
Finn Otto Sanne, Kongsberg Seatex AS A high performance INS/DGNSS sensor requires an optimal integration of inertial sensor data and GNSS measurements. The latest MEMS gyro developments in combination with carefully selected accelerometers are enabling the performance required for demanding survey applications. The paper presents some of the achievements related to MEMS gyro development and results obtained by the MEMS gyro/accelerometer combination integrated with high performance DGNSS measurements.
16:30– 17:00
Acoustic INS aiding NASNet® & PHINS
Sam Hanton, Nautronix Inertial Navigation Systems (INS) are becoming increasingly common as part of subsea positioning spreads, particularly in deeper waters. Typically INS is used to try and compensate for the long standing stability limitations of conventional Ultra-Short Baseline (USBL) acoustic systems and update rates for Long Baseline (LBL) systems, while also providing a short term safety net against total loss of ‘absolute’ positioning systems. The paper discusses the challenges along with the pros and cons of INS aiding using each of acoustic positions and acoustic ranges allowing a ‘sparse’ acoustic solution to provide high quality aiding. Also presented field trial results of integration to demonstrate the performance of each of the aiding methods against high accuracy DGNSS.
17:00 Programmes may be subject to change. Close
Conference programme sponsored by:
Innovative positioning solutions from a leading global signal provider
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100 |
Page 101 |
Page 102 |
Page 103 |
Page 104 |
Page 105 |
Page 106 |
Page 107 |
Page 108 |
Page 109 |
Page 110 |
Page 111 |
Page 112 |
Page 113 |
Page 114 |
Page 115 |
Page 116 |
Page 117 |
Page 118 |
Page 119 |
Page 120 |
Page 121 |
Page 122 |
Page 123 |
Page 124 |
Page 125 |
Page 126 |
Page 127 |
Page 128 |
Page 129 |
Page 130 |
Page 131 |
Page 132 |
Page 133 |
Page 134 |
Page 135 |
Page 136 |
Page 137 |
Page 138 |
Page 139 |
Page 140 |
Page 141 |
Page 142 |
Page 143 |
Page 144 |
Page 145 |
Page 146 |
Page 147 |
Page 148 |
Page 149 |
Page 150 |
Page 151 |
Page 152 |
Page 153 |
Page 154 |
Page 155 |
Page 156