imo performance standard gps

8/2/2019 IMO Performance Standard GPS

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ANNEX 28RESOLUTION MSC.l1S(73)(adopted on 1D ecem ber 200 0)

ADOPTION OF THE REVISED PERFORMANCE STANDARDS FORSlUPBORNECOMBINED GPSlGLONASS RECEIVER EQUIPMENT

T HE M AR IT IM E SA FET Y CO MM ITT EE ,RECAllJNG Article (28 (b) of the Convention on the In ternational Maritim e

O rg an iz ati on c on ce rn in g th e f un ctio ns o f th e Committee,RECA LLIN G A LSO resolution A .886(21), by which the Assembly resolved t h a t th efunction of adop ting perfonnan ce s t a n d a r d s and technical specifications, as w ell as am endm entsth ereto shall be performed by the M aritim e Safety Com mittee andIor th e Ma rin e E nv iro nm en t

P ro te ctio n C omm itte e, a s a pp ro pria te , o n b eh alf o f th e O rg an iz atio n,RECALLING FURTIlER that, in accordance with resolution A .8IS (19) by which theA ssem bly adopted the IM O policy for the recognition and acceptance of suitable rad ionavigationsy stem s intended for international use to provide ships 'with n av ig atio na l p os itio n- f ixing

throughout their voyages, the G lobal Positioning System (GPS) and the G lobal NavigationSatellite Sy stem (G LONA SS) have been recognized as possible com ponents of th e world-wideradionavigation system,

NOTING that shipborne combined recervmg equipment for the world-w ideradionavigation sy stem offer im proved availability, integrity, accuracy and resistance tointerference,

RECOG NIZIN G the need to im prove the previously ado pted, b y resolu tion M SC .7 4(69),A nnex 1, perform ance standards for shipbom e com bined GPS/GLONASS r ec eiv er e qu ipmen t inorder to ensure the operational reliability of such equipm ent and taking into accou nt th ete ch no lo gic al p ro g re ss a nd e xp er ie nc e g ain ed ,

H AV IN G CO NSID ER ED the recom mendation on the revision of resolu tion M SC.74(69),A nnex 1 m ade by the S ub -C omm ittee o n S afety o f N av ig atio n at its fort y - six th sess ion ,1. ADOPTS the Revised Recommendation on Performance Standards for ShipbomeC omb in ed R ec eiv er E qu ipm en t. s et o ut inth e Annex to t he p r es en t r eso lu ti on ;2 . RECOM:MENDS Governments to ensure that com bined GPS/GLONASS receiverequipment :

(a) if installed on or after 1 July 2003 , c on fo rm to p erfo rm a nc e s ta nd ard s n ot in fe rio rto th os e s pe cif ie d inth e Anne x to th e present r es olu tio n; a nd(b) if insta lled before I July 2 00 3, co nfo rm to p erfo rm an ce stan da rd s n ot in ferio r to

th os e s pe cifie d in A nn ex 1 to r es olu tio n MSC.7 4(6 9).

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ANNEX 28P ag e 2ANNEX

REVISED RECOMMENDATION ON PERFORMANCE STANDARDS FORSHIPBORNE COMBINED GPS/GLONASS RECEIVER EQUIPMENT1 INTRODUCTION1.1 The G lobal Positioning Sy stem (GPS) and G lobal N avigation Satellite Sy stem(GLON ASS) are space-based positioning, velocity and tim e sy stem s. The GPS space segmentwill normally be com posed of 24 satellites in s ix o rb its . The spacing o f s a te ll it es in o rb it w ill bearranged so that a m in im um o f f ou r sa te llite s will be in view to users world-wide, ' W i th a positiond ilu tio n of p re cisio n (PDOP ) ::::.6 . T he G LON ASS space segm ent w ill norm ally be com posed of2 4 sa te llite s p lac ed in 3 o rb ita l p la ne s with 8 satellites in each plane. The spacing of satellites inorbit will be arranged so that a minimum of four satellites will be in view to users world-wide,with a PDOP : s 6.1 .2 A combined receiver, when compared to either the GPS or GLONASS receiver, offersimproved availability , in tegrity , accuracy and resistance to interference; increased ease ofinstallation, and the ability to operate in th e differential GPS mode (DGPS), differentialG LO NA SS m ode (D GL ON ASS) and com bined DGP S and DGLONAS S m ode, w hen available.1 .3 .Receiver equipment capable of com bining individual satellite m easurem ents from G PSand G LON ASS constellations to form a single solu tion is intended for navigational purposes onships with m axim um speeds not exceeding 70 knots. Such equipm ent should, in addition to theg en era l re qu ireme nts c on ta in ed in resolu tion A694(17/, com ply with th e fo llow in g min imumpe rfo rmance requ ir emen ts .1.4 These standards cover the basic requirements of posi tion- f ixing f or n av ig at io n purposesonly an d d o n ot c ov er o th er c om p uta tio na l fa cilitie s w h ic h m a y be in th e equipment. .2 COMBINED GPSlGLONASS RECEIVER EQUIPMENT2.1 The w ords "com bined G PS/G LO NA SS receiver equipm ent" as used in these perform ancestandards include all the com ponents and units necessary for the s~:tem to properly pe rfo rm itsin tended functions . T he e qu ipmen t s ho u ld in clu d e th e f oll ow in g minimum facilities:

.1 antenna capable of receiving both GPS and GLON ASS signals;

.2 combined GPS/G LONASS receiver and processor;

.3 means of accessing t he comput ed l at it ud e /l ong it ud e po si ti on ;

.4 data c on tr ol a nd in te rf ac e; a nd

.5 position display.2.2 T he a nte nn a d esig n s ho uld be s uit ab le f or fitting at a position on the ship which ensures aclear view of th e satellite constellations.

R efe r to Publication lEe 60945.1 :\M SC\ 73 \21 a3 .doc

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ANNEX 28Page 3

3 PERFORMANCE STANDARDS FOR COMBI:SED GPS/GLONASS RECEIVEREQUIPMENT3.1 The combined GPS/GLONASS r ec ei ve r equi pmen t shou ld :

.1.1 be capable of receiving and processing the Standard Positioning Service (SPS)signals of the GPS as modified by Selective Availability (SA) and range codesignals in GLONASS and provide position informafion Jn latitude and longitudeWorld Geodetic System (WGS) 84 co-ordinates in degrees, minutes andthou sandths of minutes. Means m ay be provided to transform the com putedp ositio n in to data compatib le w ith the datum of the n av ig atio na l c ha rt in use.Where this facility exists, th e d is pla y and an y data output sho uld indicate that theco-ordinate conversation is being performed and should identify the co-ordinatesystem inwh ic h th e po sitio n is expressed;

.1.2 operate on the L1 frequency signal and CIA code in GPS and Ll frequency signala nd ra ng e code in GLONASS ;

.1.3 be provided with at least one output from which position information can besupplied to other equipment. The output of position information should be inaccordance with th e relevant international standards;"

.1.4 have static accu racy su ch that the position of t h e a nte nn a is d ete rm in ed to within35 m (95%) in non-differential mode and 10 m (95% ) in d if fe re nti al mode withhorizontal dilution of precision (HOOP) :::: 4 or position dilution of precision(PDOP)~6;

.1.5 have dynamic accuracy such that the position of the ship is determ ined to within35 m (95% ) in non-d ifferential m ode and 10 m (95% ) in d if fe re ntia l mod e withHDOP .:::4 or PDOP ~ 6 under the conditions of sea s t a t e s an d ship 's m otio n likelyto be experienced inships":

.1.6 be capable of selecting au toma ti ca ll y . t he appropriate satellite transmitted signalsfo r determination o f th e s hip 's position with th e re qu ire d a cc ura cy a nd update rate;

. 1 .7 be capable of acquiring satellite sig nals w ith inp ut signals h av in g c arrie r le ve ls inthe range of -130 dBm to -120 dB m. O nce the satellite signals have been acqu iredthe equ ipm ent should continue to operate satisfactorily with s ate llite s ig na lshav ing c arrie r le ve ls d own to -133 dBm;

.1.8 becapablc of a cq u ir in g pos itio n to th e required accuracy, within 30 min, whenthere is no valid almanac data;

.1.9 be capable of acqu iring po sition to the r eq ui re d a cc ur ac y , within 5 min, whenth ere is v alid a lm an ac d ata ;

Publication IEe 61162. R es olu tio n A .6 94 ( 1 7); P ub lic atio ns lEe 6721 - 3 -6 , lEe 6094 5 and lEe 61108-3.

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ANNEX 28Page 4

.1.10 be capable of re-acquiring position to the required accuracy, within 5 min , whenall GPS and GLONASS signals are interrupted for a period of at least 24 h, butthere is no loss of power;

.1.1 J be capable of re-acquiring position to the required accuracy, within 2 min, whensubjected to a power interruption of 60 s;

.1.12 be capable of re-acquiring an irdividual satellite signal and utilizing it ill theposi tion so lu tion within lO s after being blocked for 30 s;

.1.13 generate and output to a display an d digital interrace' a new position solution atleast once every 1 s;

.1.14 have a minimum resolution of position, i.e, latitude and longitude of0 .0 01 m inute s;

.1.15 generate output to the digital interface" course over the ground (COG), speed overthe ground (SOG) and universal time co-ordinated (UTC). Such outputs shouldhave a validity mark aligned with that on the position output The accuracyrequirement for COG and SOG should not be inferior to the relevant PerformanceStandards for Heading" * and SD"ME;***

.1.16 have the facilities to process OOPS and DGLONASS data fed to it, in accordancewith Recommendation ITU-R M .823 and the appropriate RTCM standard; and

.1.17 be capable of operating satisfactorily in typical in terference condit ions .4 PROTECTION

Precautions should be taken to ensure that no permanent damage can result from anaccidental short circuit or grounding of the antenna or any of its input or output connections oran y of the combined GPSfGLONASS receiver equipment input>; or output>; for a duration of5 min.5 FAILURE WARNINGS AND STATUS INDICATIONS5.1 T he equipment should provide an indication if the position calculated is likely to beoutside of the requirements of these performance standards.5.2 The combined GPS/GLONASS receiver equipment should provide as a minimum:

.1 an indication within 5 s ifeither:.1.1 t he speci fi ed HOOP has been exceeded; or

Conforming to Publication lEe 61162 series. R eso lu tio n A .424(X J). Resolution A.824( 19).

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ANNEX 28Page 5.1.2 a new posi ti on has not been calculated for m ore than 1 s.

Under such conditions the last known position and th e tim e of the last valid fix, withexplicit indication of this state, so that no ambiguity can exist, should be output untilnormal operation i s resumed;.2 a warning of loss of position;.3 OOPS and lX}LONASS status indication of:

.3.1 the receipt of DGPS and DGLONASS signals; and

.3.2 whether DOPS and DGLONASS corrections arc being applied to th eindicated ship 's posi tion;

.4 DGPS an d DGLONASS in te gr ity s ta tu s a nd a la rm ; and

.5 DGPS and D GL ON ASS text m essage display .

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