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IMCA M 229 

 

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Preface 

Reliable  and  robust  methods  of  positioning  are  required  for  safe  vessel  operations  at  offshore  installations.  
The development of dynamic positioning (DP) systems has been gradual over the past 50 years and today, various 

manufacturers’ systems are available around the world. 

Every measurement technology is bound by limitations (i.e. physics) and external factors (e.g. signal obstruction, 
solar activity, weather, sea conditions, range), which makes it difficult for one technology to cover all applications 
with uninterrupted service.  Hence the growth in the use of DP has been accompanied by the development of 

internationally recognised rules, standards and guidelines against which DP vessels are designed, constructed and 
operated.

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The  growth  and  development  of  DP  systems  has  stimulated  the  development  of  DP  position  measurement 
sensors  which  have  become  more  sophisticated  as  technology  has  allowed.  Within  the  relative  position 

measurement equipment range the DP market is familiar with the use of laser and microwave sensors.

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  This 

document describes the Mini RadaScan product, which is part of the range of microwave relative positioning 

systems offered by Guidance Marine (see 

www.guidance.eu.com

). 

IMCA  has  published  IMCA  M  209  – 

RadaScan  microwave  radar  sensor  for  dynamic  positioning  operations

.    This 

document provides an overview of the Mini RadaScan system. 

                                                      

1   IMO MSC Circ. 645 – 

Guidelines for vessels with dynamic positioning systems

 

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IMCA M 103

 – 

Guidelines for the design and operation of dynamically positioned vessels

 

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182 MSF

 – 

International guidelines for the safe operation of dynamically positioned offshore supply vessels

 

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IMCA M 170

 – 

A review of marine laser positioning systems – Part 1: MK IV Fanbeam® and Part 2: CyScan

 

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IMCA M 174

 – 

A review of the Artemis Mark V positioning system

 

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IMCA M 209

 – 

RadaScan microwave radar sensor for dynamic positioning operations

 

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IMCA M 224

 – 

Guidance on RADius relative positioning system

 

Содержание Mini RadaScan

Страница 1: ...Mini RadaScan Microwave Radar Sensor for Dynamic Positioning Operations IMCA M 229 October 2015...

Страница 2: ...onal sections which facilitate work on issues affecting members in their local geographic area Asia Pacific Central North America Europe Africa Middle East India and South America IMCA M 229 This repo...

Страница 3: ...3 Responders 11 8 Operation 13 8 1 Dashboard 13 8 2 Multiple Sensor Multiple Target Operation 14 8 3 Mini RadaScan Interoperability and Compatibility 14 9 Servicing and Maintenance 16 9 1 Software Upg...

Страница 4: ......

Страница 5: ...sophisticated as technology has allowed Within the relative position measurement equipment range the DP market is familiar with the use of laser and microwave sensors 4 5 6 7 This document describes...

Страница 6: ...ors Association IMO International Maritime Organization IP Internet protocol LAN Local area network LED Light emitting diode mrad milli radians OSV Offshore supply vessel PCI Peripheral component inte...

Страница 7: ...itions where the presence of heavy fog heavy rain snow dust or steam could affect the performance of laser systems A typical vessel will utilise a number of sensors simultaneously Therefore each senso...

Страница 8: ...rol the sensor using the dashboard software System components are shown in Figure 1 Figure 1 Mini RadaScan system components Mini RadaScan Responders one or more that are mounted on the fixed platform...

Страница 9: ...ications such as drilling rigs and production platforms Multi targets tracking provides target range and bearing measurements and is also capable of calculating vessel heading It is mainly used in mob...

Страница 10: ...nsor Placement Sensor placement varies with each application therefore the information hereafter is provided as a general guideline On a platform supply vessel PSV the typical mounting position for th...

Страница 11: ...ne should be configured in the Dashboard software Following these guidelines should prevent the sensor detecting any ghost reflections from metallic surfaces which may occur from any microwave based s...

Страница 12: ...y VFD mounting holes and pressure vent I O for the DP system and the dashboard The radar dome is attached to the base by fixing screws while the gasket ensures a tight seal The assembly and disassembl...

Страница 13: ...of light Figure 5 FMCW beat frequency illustration no Doppler shift While DP operations are usually executed at low speed the vessel movements are still significant enough to introduce a non negligib...

Страница 14: ...gnal generated by the transceiver is sampled and processed so that the energy peak can accurately be measured by a sample position i Figure 7 which is then converted to a bearing measurement using the...

Страница 15: ...tracking using the dashboard interface Once a responder has been detected motion tracking is achieved using both range and bearing predictor algorithms These predictors are used to optimise the obser...

Страница 16: ...range of DP operations it is strongly recommended to follow the installation procedure see section 6 3 to optimise the signal quality and achieve the maximum range specified 7 3 2 Power Source The sy...

Страница 17: ...d or a touch screen display During normal operation the sensor updates the dashboard scanner display Figure 10 Figure 10 Mini RadaScan dashboard When a target has been detected the display shows the r...

Страница 18: ...ly Figure 11 Figure 11 Multi responder multi sensor operation As illustrated in Figure 11 a DP operator can track more than one responder at the same time whilst another DP operator can track one or m...

Страница 19: ...esponder right When using multiple targets because of the differing modulation types certain rules must be adhered to A comprehensive guide to the differences between these targets is available 10 10...

Страница 20: ...dashboard can be upgraded in the field using a USB memory stick or by transferring release files on the local network e g marine computer The two step procedure involves Remote installation of the se...

Страница 21: ...rine applications Figure 13 the smaller footprint and mounting requirements of the Mini RadaScan has expanded the range of applications to smaller vessels Figure 13 Suitable vessel applications Platfo...

Страница 22: ...e they must be shielded from one another with a metal screen The screen must be large enough to physically shield the Mini RadaScan sensor from the whole width of the X band antenna The Mini RadaScan...

Страница 23: ...rror in the tangential direction Radial error is more or less constant over a wide operating range For a given bearing error tangential position error is proportional to the distance from the sensor t...

Страница 24: ...s below a threshold the measurement is suppressed and the fix is not supplied to the DP system This threshold is set so that measurements cut out before the errors grow much above the level seen at hi...

Страница 25: ...ncy Various mitigating measures are taken within Mini RadaScan but it remains the fact that operation in this range is the most challenging in terms of range accuracy And in this range sea reflection...

Страница 26: ...e 19 Accuracy scatter plot Standard deviation 0 230 m Figure 20 Accuracy scatter plot Standard deviation 2 06 mrad Both range and bearing errors are quite a lot larger than in the most normal operatin...

Страница 27: ...Frequent Small Errors Table 1 Sea reflection accuracy summary 11 4 2 Sea Reflection Typical Operating Conditions Here are some range and bearing measurements typical of station keeping operations in t...

Страница 28: ...t less than 125 m and 1 accuracy of 0 1 m in range and 1 mrad in bearing are commonly achieved 11 5 Frequently Asked Questions 1 Does Mini RadaScan operate on the same principles as X band radars No A...

Страница 29: ...nstallation 8 What type of DP systems can Mini RadaScan be connected to The Mini RadaScan was designed specifically as a generic DP position reference sensor It supports all the major DP systems and i...

Страница 30: ...w and fog It was also noted that although the unit has a number of moving parts this has caused no issues over a prolonged period of years Members have stated that the need to set up a target responde...

Страница 31: ...60 x 132 x 71 mm Weight 12 2 Sensor Specifications Sensor Technical Details Sensor type FMCW Emission frequency 9 2 9 3 GHz Maximum output power 1 W Operating range 10 m to 600 m Range accuracy 0 25 m...

Страница 32: ...ective 2004 108 EC EMC CE Certified FCC Approved 12 3 Responder Specifications Responder Technical details Emission frequency 9 2 9 3 GHz Power 220V 110V mains adapter Rechargeable battery 30 days Non...

Страница 33: ...ave radar sensor for dynamic positioning operations 7 IMCA M 224 Guidance on RADius relative positioning system 8 IMCA M 199 Guidelines on installation and maintenance of DGNSS based positioning syste...

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