Manuale d’uso / di manutenzione del prodotto OM-20000072 del fabbricante MPC
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OM-20000 072 Rev 0D Modulated Precision Clock (MPC) USER MANUAL.
2 MPC User Manua l Rev 0D Proprietary Noti ce Modulated Precision Cloc k (MPC) User Manual Publication Numb er: OM-2000 0072 Revision Level: 0D Rev ision Da te: 2002/0 3/27 Propriet ary Notice Information in this d ocument is subject to change without notice and does not represent a commitment on the part of NovAtel Inc.
MPC User M anual Rev 0D 3 T able of Co ntents Proprieta ry Notice 2 Software License 8 Warranty P olicy 9 Custo m er Servi ce 10 Notices 11 Foreword 12 Congratulati ons! .............. ................... ............. .................... ...........
4 MPC Us er Manual Re v 0D 5.2.2 Conne ct ................... ................... .................... ................... ................... ... 44 5.2.3 Confi gure Client ............ .................... ................... ................... ...
MPC U ser Ma nual Re v 0D 5 Figures 1 MPC ......... ............. ............. ............. ............. ............. ............. ...... ............. ...... 13 2 Typical MPC Setup ............ ................... .................... ..........
6 MPC U ser Manua l Rev O A 45 Logging Co ntrol ..... ................... ................... .................... ................... ............. 50 46 Set Up Logg ing ........... ................... .................... ................... .......
MPC User M anual Rev 0D 7 Ta b l e s 1 MPC Contr oller Models ......................... .................... ............. ................... ...... 14 2 UDP Message Format ........ ................... .................... ................... .......
MPC U ser Ma nual Re v 0D 8 Software License Softwa re License BY OPENING THE SEALED DI SK P ACKAGE (EN VELOPE) , YOU ARE AGREEING TO BE BOUND BY THE TERMS OF THI S AG RE EMEN T . IF Y OU DO NO T AGR EE TO TH E T E RMS O F TH IS A G RE EMEN T , PRO M P TL Y R ETUR N THE UNOPENED DISK P ACKAGE AND THE ACCOMP AN YING ITEMS TO Nov Atel Inc.
MPC User M anual Rev 0D 9 W arranty Policy Warranty Policy NovAtel Inc . warrants that its Global Positio ning Syst em (GPS) products are free from defects in materials and workmansh ip, subjec t to t.
MPC User M anual Rev 0D 10 Customer Service Customer S ervice EURO4 FIRMWARE UP DATES AND UPGRADES Firmware u pdates are firmware revisions to an ex isting model, which improves basic functionality of the GPS receiver . During the one-year warranty coverage following initial purchase, firmware updates are supplied free o f charge.
MPC User M anual Rev 0D 11 Notices Notices The following n otices apply to MPC. CSA NOTICE Each MPC unit has been tested by a Canadian S tan dards Association (CSA) inspector and fou nd to comply with the s pecial Inspection Requirements of Electrical Equipment.
MPC User M anual Rev 0D 12 Foreword Foreword Congratulations! Congratul ations o n your pur chase of the Mod ulated Preci sion Clock (MPC). NovAtel is an indu stry leader in s tate-of-the-art GPS receiver desi gn.
MPC User M anual Rev 0D 13 Chapter 1 Intr oduction The MPC is a high per formance, high accuracy , G PS receiver with fast data update rates and integrated memory in its hard disk for data log ging. The MPC’ s front panel also features a V acuum Fluorescen t Display (VFD) pan el and keypad f or on the fly configu rations.
14 MPC User Ma nual Rev 0 D Chapter 1 Introduc tion 1.1 Models and Features The MPC is available in several dif ferent firmwar e models whos e configur ations may in clude other additional features. Some possible conf i gurations can be seen in T able 1 .
Introduc tion Chapter 1 MPC Use r Manual Rev 0D 15 1.2 ACCESSORIES AND OPTI ONS The MPC can be used with the f ollowing accessories: • Power cable to connect the MP C to a 1 10 or 220 V AC power s o.
MPC User M anual Rev 0D 16 Chapter 2 Quick St art Setting up the MPC is a straightforward process, whet her yo u are in the field (co llecting dat a) or back at the of fice (configuring the MPC, or trans ferring collected data to you r PC for post-processing ).
Quick S tart Chapter 2 MPC Use r Manual Rev 0D 17 A typical configur at ion would res ult from the following s teps (see also Figur e 2 on Page 16 ): 1. Place the MPC on a desk o r other suitable work surf ace. 2. Connect the o utput of a power source to the Power Input por t on the back of the MPC.
MPC User M anual Rev 0D 18 Chapter 3 MPC Setup Consid erations 3.1 Choose the Ri ght Antenna The recommen ded antenna is from the GPS-60 0 antenna s eries, which ar e ideal for all applications . A Model 60 0 GPSAnte nna provides comparable pe rformance to a ch oke ring ground plane a ntenna while being much lighter and smaller .
MPC Setup Consideration s Chapter 3 MPC Use r Manual Rev 0D 19 CAUTION No warranty is made that th e MPC will meet its perfor mance specifications if a non-NovAtel an tenna is used. 3.2 Rear Panel Functional ity The connections o n the rear panel and their connector typ es are shown on Figur e 3 .
20 MPC User Ma nual Rev 0 D Chapter 3 MPC Se tup Consid erations 3.2.1 10 MHz In and 10 MHz Out There are two BNC con nectors on the back of th e MPC for 10 MHz In and 10 MHz Out.
MPC Setup Consideration s Chapter 3 MPC Use r Manual Rev 0D 21 devic e’ s. Th e MPC’ s defau lt port setting s are [R S232, 9600 B PS, no pa r ity , 8 da t a bits, 1 s top b i t, no handshak ing, and ech o of f].
22 MPC User Ma nual Rev 0 D Chapter 3 MPC Se tup Consid erations 3.2.4 P ower After initial connection of the power source to the receiver and pressing the power switch on the back of the unit (see Figur e 3 on Page 19 ), the Po wer LED on the fro nt of the MP C glows red.
MPC Setup Consideration s Chapter 3 MPC Use r Manual Rev 0D 23 3.2.5 RF Port & Cables The GPS Antenna In connector is bi-direction al in th at it accepts RF signals from the an t enna, and it supplies DC pow er to th e low-n ois e amplif ier ( LNA) of an active antenna.
24 MPC User Ma nual Rev 0 D Chapter 3 MPC Se tup Consid erations 3.3.1 I/O Connectors and Cables Below the VFD screen on the front of the MPC are three BNC female connectors: 10 MHz Out, 1PPS Out and Mark In. 3.3.1.1 10 MHz Ou tput The 10 MHz output provides a high-stability reference 10 MHz frequency that is by default phase locked to GPS time.
MPC User M anual Rev 0D 25 Chapter 4 Using the MPC Before using MPC fo r the first time, ensure that you have follo wed the in stallation instructio ns of Chapt er 2, Quick S tart and Cha pter 3, MP C Setup Co nsiderat ions, star ting on Pa ge 16 .
26 MPC User Ma nual Rev 0 D Chapter 4 Usi ng th e MPC the menu is changed to ‘YES’, then the IP , SUBNET and GA TEW A Y rows will be assigned automatically upon activation. Connect an RJ4 5 cable from your local internet o r intranet wall jack to the Ethernet port on the MPC.
Usi ng th e MPC Chapter 4 MPC Use r Manual Rev 0D 27 The Modems Pr operties dialog will appear as seen in Figur e 7 . Figure 7: Modems Pr operties Click on the Add bu tton to in stall the modem or PP P connection and the Install Ne w Modem dialog will appear as seen in Figur e 8 .
28 MPC User Ma nual Rev 0 D Chapter 4 Usi ng th e MPC button. The modem installation will contin ue as seen in Figur e 9. Figure 9: Modem Installat ion Continued Click in the Selected Ports field and sel ect the PC port th at your MPC will b e connected to from the list.
Usi ng th e MPC Chapter 4 MPC Use r Manual Rev 0D 29 Figure 1 1: Inst alled Modem Properties Select your con nection in the Mode m column and c lick on t he Prop erties butto n.
30 MPC User Ma nual Rev 0 D Chapter 4 Usi ng th e MPC OK but ton. Return to the Control Pan el and select the Network icon as seen in Figur e 13. Figure 13: Network Icon The Network dialog appears as seen in Fi gur e 14 . Figure 14: Ne twork Serv ices Select the Services tab in the Networ k dialog.
Usi ng th e MPC Chapter 4 MPC Use r Manual Rev 0D 31 Figur e 15: Select Ne twork Serv ice Select Remote Access Service and ensure y our operating sys tem install disk is in the PC dis k drive. Click on the Have Disk butto n and the Add RAS Dev ice dialog will appear as seen in Figur e 16 .
32 MPC User Ma nual Rev 0 D Chapter 4 Usi ng th e MPC Figure 18: Network Configuration Check the TCP/IP ch eck box and click in the Allo w Any Authentication Includin g Clear T ext field. Click on the Configure button next to the T C P/IP check box and the RAS Server TCP/IP Configurat ion dialog will appear as seen in Figur e 19 .
Usi ng th e MPC Chapter 4 MPC Use r Manual Rev 0D 33 and End add resses as shown in Fi gur e 19 on Pag e 32 . C lick on the OK button an d the Remote Access Setup dialog will appear with your connectio n port, device and type showing as in Figur e 20 .
34 MPC User Ma nual Rev 0 D Chapter 4 Usi ng th e MPC The Remote Access Admin dialog will appear as seen in Figur e 22 . Figure 2 2: Remote Access Admin on PC From the main menu, s elect Server | S ta.
Usi ng th e MPC Chapter 4 MPC Use r Manual Rev 0D 35 On the taskbar , select Start |Adminis trat ive T ool s (Common) || User Manager for the Us er Manager dialog to appear as seen in Figur e 25 Figure 25: User Manager From its main menu, select User | New User and th e New User dialog w ill appear as shown in Figur e 26.
36 MPC User Ma nual Rev 0 D Chapter 4 Usi ng th e MPC Figure 27: Dialin Information Check the Grant Dialin Permission to User check box an d click in the No Call Back field. Click on the OK but ton. Restart your PC for the new sett ings to tak e effect.
Usi ng th e MPC Chapter 4 MPC Use r Manual Rev 0D 37 Change the DIRECT row status to CONNECT :YE S. Once you have pres sed the ENTE R key , the MPC will attempt to ‘dial in’ to the host computer . If success ful, the IP address will appear in the DST A TUS row if there are no errors, and an error message will appear if there is an error .
38 MPC User Ma nual Rev 0 D Chapter 4 Usi ng th e MPC Figure 32: CONFIG CLIENT Menu Y ou can addedit u sers an d their p rivileges by choo sin g Setup i n the Mod ulate d Precisio n Clo ck home page followed b y the Set Up Users button. See also Section 6.
Usi ng th e MPC Chapter 4 MPC Use r Manual Rev 0D 39 a data li nk capable o f data throu ghput at a r ate of 2400 bits per second or h igher is suf ficient for th e examples shown below . The external d evice is connected to the MPC’ s DGPS port with a user- suppli ed RS232 cable.
MPC User M anual Rev 0D 40 Chapter 5 VFD Menus The front p anel of MPC has a V acuum Fluorescent Di splay (VFD) with 7 interactio n keys. The panel consist of four navigational, a combination edit/enter, a power , and an escape key .
VFD M enus Chapter 5 MPC Use r Manual Rev 0D 41 where you can access any of the main functionality menus and their columns. Figure 34: Op e ning Menu 5.1 Menu Access The menu structure is arranged as columns o f fu ncti onality . Each column may have several pages of related dat a where a page can have up to seven rows.
42 MPC Us er Manual Re v 0D Chapter 5 VFD Menus group in an editable row to be un derlined. Th e left and righ t arrows move the cursor to the groups in the row . The up and down arro ws cycle through a lis t of choices for that gro up value. An e xample of a group val ue that the cursor has been moved t o, is the PP P value sh own in Figur e 36 .
VFD M enus Chapter 5 MPC Use r Manual Rev 0D 43 The information in this column is refresh ed every second unless another column in the menus is b eing edited.
44 MPC Us er Manual Re v 0D Chapter 5 VFD Menus • LON: The current lon gitude in degrees, minu tes, seconds and decimal seconds to 4 decimal places. • HEIGHT : The current mean sea level (MSL ) heig ht in m eter s to 3 decimal places. • # SA TS: The number of GPS satellites currently being tracked.
VFD M enus Chapter 5 MPC Use r Manual Rev 0D 45 • MODEM: CONNECT : YES or NO dependin g on whether there is or is not respectively a con nection via the modem card.
46 MPC Us er Manual Re v 0D Chapter 5 VFD Menus maximum). The MPC allows multiple u sers. Example of clients m a y be the admini strat or who has all privi leges, the use rs wh o have some bu t not all privileges, and guests who have little or no privileges.
VFD M enus Chapter 5 MPC Use r Manual Rev 0D 47 directly with each other . • GA TEW A Y : The address of the device th at will tr an sfer messages out of the local network to the internet. • COMPUTER: Give your MPC a network n ame (8 character s maximum ).
48 MPC Us er Manual Re v 0D Chapter 5 VFD Menus • CFG MODEM HOST The MPC modem is preconfigured for auto-answering as a host. It will iss ue an IP address i n th e ran ge 1 92 .160 .200 to 192.160. 215, and establi s h a P PP co nn ectio n t o the client.
MPC User M anual Rev 0D 49 Chapter 6 Software Programs The MPC software for the Euro4 GPSCard and the VFD are al ready installed. The Modu lated Pr ecision C lock website is accessible on a PC via an internet connection. It is your sourc e for MPC setu p, log ging, sy stem s ummar ies and analysis pl ots.
50 MPC Us er Manual Re v 0D Chap ter 6 Softw are Prog ram s As seen from Fig ur e 43 on Page 49 , there are four o ptions in the Modu lated Pr ecision C lock home page : Logging, s ee Section 6. 1.1, Logging below Setup, see Section 6.1 .2, Setup C onfigur ation on P age 55 Analysis Plots, see Section 6 .
Software Pr ogra ms Chapte r 6 MPC Use r Manual Rev 0D 51 6.1.1.1 Logging Setup Y ou can set up l ogs for up to 5 chann els on your MPC. Select a channel and click o n its button, see Figur e 46 . Figure 46: Set Up Logging First, choose where to send your data.
52 MPC Us er Manual Re v 0D Chap ter 6 Softw are Prog ram s T ab le 2: UDP Mes sage Format Nex t , choos e when t o s end t h e data o r set up a sched ule. Choosi ng CON TINUO US lo gs your data continuously . It will star t a new file every hour that is divisibl e by the Rollover amo unt in the Cho ose Where section.
Software Pr ogra ms Chapte r 6 MPC Use r Manual Rev 0D 53 6.1.1.2 Parsing Responses Click on t he P arsi n g Re sponses button t o go t o the C omman d/Response Syst em Su mmary window as seen in Figur e 47 .
54 MPC Us er Manual Re v 0D Chap ter 6 Softw are Prog ram s There are three ty pes of output in the summary: Cmd A log sum m ary in the form: Cmd: YYYY-MM-DD hh:mm :ss.ss >LOG THISPORT_ c log where YYYY is the calendar year (e. g. 2002) MM is the calendar mon th (01-12) DD is the calendar d ate (01-31) hh.
Software Pr ogra ms Chapte r 6 MPC Use r Manual Rev 0D 55 6.1.1.3 Logging St ats In the L ogging Cont rol windo w , click on the Logging S tats button to bring you to the Logging Statis tics page. An examp le is shown in Figur e 48 . Figure 48: Logging S t atistics Choose a Channel b y clicking on its button.
56 MPC Us er Manual Re v 0D Chap ter 6 Softw are Prog ram s Figure 49: Set Up Configuration 6.1.2.1 Set MPC Name Click on the Gener al Setup button for the Modify Receiver Parameters window to appear as seen in Figur e 50 on Page 56 . Figu re 50: Gener al Recei ver Se tup The Receiver Name is a n ame you give your MPC that is meaningful to you .
Software Pr ogra ms Chapte r 6 MPC Use r Manual Rev 0D 57 ID number which is imbedded in the UDP data str eam (if used), see Sectio n 6.1.1 .1, Lo ggin g Setu p on Page 51 . It uniquely identifies the messages as o riginating from your MPC. Click on the Go butto n to save your changes.
58 MPC Us er Manual Re v 0D Chap ter 6 Softw are Prog ram s Figure 52: Disk Maintenance Click on the Set Auto Cleanup V alues button to save yo ur selection, or click on the Ca ncel button to disregard your changes and retu rn y ou to the m a in Co nfiguration Setup window .
Software Pr ogra ms Chapte r 6 MPC Use r Manual Rev 0D 59 Service if you have any MPC questions or problems. Files that become too large can be selected here and th en deleted by clicki ng on th e Delete Sy stem Log Files button.
60 MPC Us er Manual Re v 0D Chap ter 6 Softw are Prog ram s CONFIGURE PPP PORT An example of the Configure PPP Port window is shown in Figur e 56 . Figure 56: Configure PPP Port First enter the user n ame and password the MPC will us e to ‘connect’ to the PPP host in t he User Name and Pas sword fields .
Software Pr ogra ms Chapte r 6 MPC Use r Manual Rev 0D 61 CONFIGURE MODEM PORT An example of the Confi gure Modem Por t window is shown in Figu re 57 . Figure 57: Configure Modem Port First enter the user na me and password the MPC will use to ‘connect’ to the P PP host in the User Name and Password f i elds.
62 MPC Us er Manual Re v 0D Chap ter 6 Softw are Prog ram s CONFIGURE ETHERNET PORT An example of th e C onfigure Eth e rnet Port win dow is show n in Figur e 58.
Software Pr ogra ms Chapte r 6 MPC Use r Manual Rev 0D 63 SET UP BASE S TATION T o set up your MPC as a base s tation, click on the Set Up Base Station button in the Receiver Setup dial og , see Figur e 59 , to bring you to the List Current Co nfiguration window wh ere you can enter GPS commands.
64 MPC Us er Manual Re v 0D Chap ter 6 Softw are Prog ram s Chapter 1 Figure 60: Current Receiver Configuration Used by MPC’ s inter nal Eur o4 rece iver - do not adjus t! Used by MPC’s internal 10 MHz OCXO - do not adjust! MPC status mes sages t o COM1 .
Software Pr ogra ms Chapte r 6 MPC Use r Manual Rev 0D 65 6.1.2.6 Reload F irmware In the Setu p Confi guration d ialog, s ee Figu r e 49 on Page 56 , click on the ReLoad Firmware button to bring you to the screen shown in Figur e 61 .
66 MPC Us er Manual Re v 0D Chap ter 6 Softw are Prog ram s SELECT USER TO EDIT Click on the Edit but ton in the Set Up Users w indow an d the Edit User wind ow will appear as se en in Figur e 63 . Figure 63: Edit User Check in the privileges check boxes that app ly to the current u ser .
Software Pr ogra ms Chapte r 6 MPC Use r Manual Rev 0D 67 Enter a username an d password for the new user . Then re-enter the password in the Re Enter Pas sword field to ensure you typed it in correctly .
68 MPC Us er Manual Re v 0D Chap ter 6 Softw are Prog ram s Figure 66: Choose V alue to Plot Against Time The default plot shown is the T emperature Vs. T ime pl ot over 5 minutes. Select a value to plot against time in the Choose V alue to Plot field.
Software Pr ogra ms Chapte r 6 MPC Use r Manual Rev 0D 69 Figure 67: Time Plot Example Figur e 68 shows the key that is displayed with each plot. It is a k ey of how the po ints in the plot are portraye d. Figure 68: Time Plot Key All plo ts are disp layed in *.
70 MPC Us er Manual Re v 0D Chap ter 6 Softw are Prog ram s Next choos e the time perio d for your plo t. The choices range fr om 1 ho ur up to a maximum of 7 day s. Click on the GO butt on to gene rate the plot. In the Constellation plots, each co lour represents a satellite PRN.
Software Pr ogra ms Chapte r 6 MPC Use r Manual Rev 0D 71 Figure 71: L1 Car rier to Noise Vs. Eleva tion Figure 7 2: L2 Code Minus Carr ier Vs. El evation.
72 MPC Us er Manual Re v 0D Chap ter 6 Softw are Prog ram s 6.1.4 Download Data In the L ogging Cont rol windo w , click on th e Download Dat a button. T he Download Files window appears as seen in Fig ur e 73 . Figure 73: Download Data Y ou are shown a choice of GPS week but tons.
Software Pr ogra ms Chapte r 6 MPC Use r Manual Rev 0D 73 Each GPS week is shown in the far l eft of the sc reen. There are also thr ee rows for each GPS week that show: date The regular calend ar dat.
74 MPC Us er Manual Re v 0D Chap ter 6 Softw are Prog ram s Figure 76: T ypical File Download Window T o save the file to di sk, choo se the Save Th is File to Disk field.
Software Pr ogra ms Chapte r 6 MPC Use r Manual Rev 0D 75 6.2 MPC Firmware Upgrades & Up dates The MPC includes two distinct processors in its en closure: • a GPS r eceiver (Eur o4 GPSCar d) •.
MPC User M anual Rev 0D 76 Appe ndix A Technica l Specifications A.1 MPC Performance Positi on Accuracy a S tandalone: L1 only 1.8 m CEP L1/L2 1.5 m CE P W A A S : L1 only 1.2 m CEP L 1 / L 2 0.8 m CE P Code Differential 0.45 m CE P Post Proces s ed 5 mm + 1 ppm CE P Time To First Fix 15 minutes (due to OCXO warm-up) Reacquisit ion 0.
T echn ical Speci ficatio ns Appendi x A MPC Use r Manual Rev 0D 77 A.2 MPC Specifications MPC CARDS There are 5 cards in t he MPC Euro4 GPS, Co mputer, Clock, Pow er, and M odem INPUT/OUTPUT CONNECTORS GPS Antenna Inp ut TNC fema le jack, 50 Ω n ominal impeda nce +4.
78 MPC User Manua l Rev 0D Appen dix A T echnic al Spec ifications BACK PANEL 10 MHZ IN Connector BNC female Capture rang e 5 or 10 MHz ± 5 Hz Sensitiv ity +9 dBm to +20 dBm into 50 Ω FRONT PANEL 1.
T echn ical Speci ficatio ns Appendi x A MPC Use r Manual Rev 0D 79 A.3 Port Pi n-Outs T able 3 : MPC COM Port Pin-Outs Connector Pin No. PPP DGPS RS232 RS232 1N / C N / C 2R X D R X D 3T X D T X D 4N.
80 MPC User Manua l Rev 0D Appen dix A T echnic al Spec ifications A.4 Power Cable The power cable supplied with the MPC, connects from the Power In put port on the back of the MPC to an external power s ource (100 to 24 0 V AC).
MPC User M anual Rev 0D 81 Appe ndix B GPS Overview The Global Positioning System (GPS) is a satellite navigation system capable of providing a highly accurate, continuous global navigation service independent of other positioning aids. GPS provides 24-hour, all-weather, worldwid e cove rage with position, velocity and timing info rmati on.
82 MPC User Manua l Rev 0D Appen dix B GPS O verview receiver with at least six satellites in view from any point on earth, at any particular time. The GPS satellite signal identif ies th e satellite .
GPS O verview Appen dix B MPC Use r Manual Rev 0D 83 Figure 80: Illustra tion of GPSCard Height Measureme nt s From the above diagram, and the f ormula h = H + N, to convert heights between the ellipso id and geoid we require the geoid-ellipsoid separation value.
84 MPC User Manua l Rev 0D Appen dix B GPS O verview hairs, the centre of the shad ed area is the "location" of the mean estimate, and the radius of the s haded area is a measure of the u ncertain ty contained in the estimate. Figure 81: Accurac y versus Pr ecision 1 B.
GPS O verview Appen dix B MPC Use r Manual Rev 0D 85 positioning requires eith er a data link between the two stations (if the positioning is to be achiev ed in real-time) or else p ost-processing of t he data collected by the remote station. At least four GPS satellites in view are still required.
86 MPC User Manua l Rev 0D Appen dix B GPS O verview B.4 Differential Positi oning There are t wo types of dif ferential pos itioning algorithms : pseudorange and ca rr i e r pha se .
GPS O verview Appen dix B MPC Use r Manual Rev 0D 87 B.5 Pseud orang e Algorithms Pseudor ange algorithms correlate the pseud orandom code on t he GPS sign al received from a particular satellite, with a version generated within the reference station receiver itsel f.
88 MPC User Manua l Rev 0D Appen dix B GPS O verview effectively cancel the receiver clock offset bi as. Thus, in single-point positioning, receiver clock of fset is not a si gnificant pr oblem. However , in pseudo range dif ferential operation, between-receive r clock of fset is a source of un correlated bias.
GPS O verview Appen dix B MPC Use r Manual Rev 0D 89 B.5.1.2 Sin gle-Point Averaging with the GPSCa rd By averaging man y GPS measurement epochs over several hours, it is p ossible to achieve a more accurate absolute position.
90 MPC User Manua l Rev 0D Appen dix B GPS O verview Figure 83: Sing le-Point Averaging * This graph represents typical results using positio n averaging. This function is useful for obtaining the WGS84 po sition of a point to a reasonable accu racy without having to implement differential GPS.
GPS O verview Appen dix B MPC Use r Manual Rev 0D 91 B.5.2 Dual S t ation Differential Positioning It is the objective of operating in differential mode to either eliminate or gr eatly reduce most of the errors intro duced by the above types of system biases.
92 MPC User Manua l Rev 0D Appen dix B GPS O verview B.5.2.1 The Re ference Station The nucleus of th e differen tial network is the refer en ce station. T o function as a reference station, the GPS receiver antenna must be positi oned at a contro l point whose pos ition is precisely known in the GPS reference frame.
GPS O verview Appen dix B MPC Use r Manual Rev 0D 93 B.6 Carrier-Phase Algorithms Carrie r- phase algorith ms monitor the actual carrier wav e itsel f.
94 MPC User Manua l Rev 0D Appen dix B GPS O verview searching p rocess can more rapi dly and accurately h ome in on the cor rect lane when dual-frequen cy measurements are available. Changes in the geom etr y of the sat ellites aids in ambiguity resolution; this is especially noticeable in L1- only solutions.
MPC User M anual Rev 0D 95 Appe ndix C W AA S Overview The W ide Area Augmentation System (W AA S) is a safe ty- critical system that pro vides a quality of positioning information previo usly unavailable. Th e W AAS improves the accuracy , integrity , and availability of the basic GPS sig n als.
96 MPC User Ma nual Rev 0 D Appen dix C WAAS Ove rview Figure 85: The W AAS Concept C.1 MPC with the W AAS Option The L1L2W model of the MPC is equipp ed with the WAAS/EGNOS opti on. The ability to simultaneousl y track two WAAS satelli tes, and incorporate the W AAS/EGNOS corrections into the position, is availab le in this model.
MPC User M anual Rev 0D 97 Appe ndix D Replacement Part s The following are a list of the repl acement parts available fo r your NovAtel GPS receiver . Should you require as sistance or need to order additional comp one nts, please contact your local NovAtel dealer or Customer Service representative.
MPC User Manua l Rev 0D 98 Index 10 MHz in/out , 20, 24 1PPS , 24 A accessories , 15, 97 accuracy , 76 horizontal , 84 positioni ng , 87–93 reference stat ion , 92 aerial phot ograph , 93 almanac da.
Index MPC User M anual Rev 0D 99 DC , 23, 77 dealer , 10 DGPS , 20, 38 differential corrections , 89, 91–92 operation , 14 posi tionin g , 84, 86–87, 91 dilut ion of preci s ion ( DOP) , 86, 88 di.
100 MP C User Manua l Rev 0D Index navigat ion , 81 NAVSTAR satellites , 81 netw ork configuration , 25–38 I/O , 21 nois e , 87, 93 notices , 11 NovAtel Inc.
Index MPC User M anual Rev 0D 101 T TCXO, see oscillators technical specifications , 76–77, 79–80 temperature , 77 time to first fix (TTFF) , 76 tracking l oops , 93 trigger event , 24 tropos pher.
OM-20000 072 Rev 0D 2002/03 /27.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il MPC OM-20000072 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del MPC OM-20000072 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso MPC OM-20000072 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul MPC OM-20000072 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il MPC OM-20000072, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del MPC OM-20000072.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il MPC OM-20000072. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo MPC OM-20000072 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
