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u-blox RCB-F9T, Руководство по интеграции

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RCB-F9T - Integration manual

3 Receiver functionality

This section describes the RCB-F9T operational features and their configuration.

3.1 Receiver configuration

The  RCB-F9T  is  fully  configurable  with  UBX  configuration  interface  keys.  The  configuration
database  in  the  receiver's  RAM  holds  the  current  configuration,  which  is  used  by  the  receiver
at  run-time.  It  is  constructed  on  start-up  of  the  receiver  from  several  sources  of  configuration.
The  configuration  interface  and  the  available  keys  are  described  fully  in  the  RCB-F9T  Interface
description [

2

].

The configuration interface has changed from earlier u-blox positioning receivers. There
is some backwards compatibility, however, users are strongly advised to adopt the
configuration interface described in this document. See legacy UBX-CFG message fields
reference section in the RCB-F9T Interface description [

2

].

Configuration interface settings are held in a database consisting of separate configuration items.
An item is made up of a pair consisting of a key ID and a value. Related items are grouped together
and  identified  under  a  common  group  name:  CFG-GROUP-*;  a  convention  used  in  u-center  and
within this document. Within u-center, a configuration group is identified as "Group name" and the
configuration item is identified as the "item name" under the "Generation 9 Configuration View" -
"Advanced Configuration" view.

The UBX messages available to change or poll the configurations are the UBX-CFG-VALSET, UBX-
CFG-VALGET, and UBX-CFG-VALDEL messages. For more information about these messages and
the configuration keys see the configuration interface section in the RCB-F9T Interface description
[

2

].

3.1.1 Changing the receiver configuration

All  configuration  messages,  including  legacy  UBX-CFG  messages,  will  result  in  a  UBX-ACK-ACK
or  UBX-ACK-NAK  response.  If  several  configuration  messages  are  sent  without  waiting  for  this
response then the receiver may pause processing of input messages until processing of a previous
configuration message has been completed. When this happens a warning message "wait for cfg
ACK" will be sent to the host.

3.1.2 Default GNSS configuration

The RCB-F9T default GNSS configuration is set as follows:

• GPS: L1C/A, L2C
• GLONASS: L1OF, L2OF
• Galileo: E1B/C, E5b
• BeiDou: B1I, B2I
• QZSS: L1C/A, L2C

SBAS  is  also  supported  but  not  enabled  in  the  default  GNSS  configuration.  SBAS  is  not
recommended for timing applications.

UBX-19003747 - R04

 

3 Receiver functionality

Page 7 of 54

Early production information

Содержание RCB-F9T

Страница 1: ...high accuracy timing board Integration manual Abstract This document describes the features and application of RCB F9T a multi band GNSS timing board o ering nanosecond level timing accuracy www u bl...

Страница 2: ...t to intellectual property rights Reproduction use modi cation or disclosure to third parties of this document or any part thereof without the express permission of u blox is strictly prohibited The i...

Страница 3: ...e evaluation 17 3 3 Interfaces 17 3 3 1 UART interface 17 3 4 Prede ned PIOs 18 3 4 1 RESET_N 18 3 4 2 TIMEPULSE 18 3 5 Antenna supervisor 18 3 5 1 Antenna voltage control ANT_OFF 18 3 5 2 Antenna sho...

Страница 4: ...y 43 4 2 1 VCC Main supply voltage 43 4 2 2 RCB F9T VCC_ANT Antenna power supply 44 4 3 Antenna 44 4 4 EOS ESD precautions 45 4 4 1 ESD protection measures 45 4 4 2 EOS precautions 46 4 4 3 Safety pre...

Страница 5: ...existing and new users should read this section to understand the new messages employed Most of the following sub sections should be familiar to existing users of u blox positioning products however...

Страница 6: ...with its di erential timing mode In di erential timing mode correction data is exchanged with other neighboring ZED F9T timing receivers via a communication network In di erential timing mode the RCB...

Страница 7: ...in u center and within this document Within u center a con guration group is identi ed as Group name and the con guration item is identi ed as the item name under the Generation 9 Con guration View A...

Страница 8: ...how often the message is output For periodic output messages the rate relates to the event the message is related to For example the UBX NAV PVT navigation position velocity and time solution is rela...

Страница 9: ...2 messages are not supported by this standard To modify the RTCM input output settings see the con guration section in the u blox RCB F9T Interface description 2 3 1 5 2 List of supported RTCM input...

Страница 10: ...into Survey in mode CFG TMODE MODE SURVEY_IN the following items are required Con guration item Description CFG TMODE MODE Receiver mode disabled survey in or xed CFG TMODE SVIN_MIN_DUR Survey in min...

Страница 11: ...PE1005_UART1 Output rate of the RTCM 3X TYPE1005 message on port UART1 RTCM base station message CFG MSGOUT RTCM_3X_TYPE1077_UART1 Output rate of the RTCM 3X TYPE1077 message on port UART1 RTCM GPS MS...

Страница 12: ...and their details can be seen in Table 6 and Table 7 below Platform Description Portable default Applications with low acceleration e g portable devices Suitable for most situations Stationary Used i...

Страница 13: ...algorithm uses a constant altitude to compensate for the missing fourth SV When a SV is lost after a successful 3D x min four SVs available the altitude is kept constant at the last known value This i...

Страница 14: ...rse over ground from position at very low speed The output of the low speed course over ground lter is published in the UBX NAV PVT message headMot eld UBX NAV VELNED message heading eld NMEA RMC mess...

Страница 15: ...B F9T Integration manual Figure 2 Position publication in static hold mode Figure 3 Flowchart of the static hold mode UBX 19003747 R04 3 Receiver functionality Page 15 of 54 Early production informati...

Страница 16: ...0 1 m s then the course over ground value becomes inaccurate too In this case the course over ground value is frozen i e the previous value is kept and its accuracy is degraded over time These frozen...

Страница 17: ...Outside The position lies outside of the geofence with the con gured con dence level Unknown There is no valid position solution or the position uncertainty does not allow for unambiguous state evalu...

Страница 18: ...EA and or UBX protocol The RCB F9T active antenna supervisor block diagram is shown in the Figure 1 The antenna supervisor is monitoring active antenna current consumption and based on that antenna op...

Страница 19: ...enabled by default in the RCB F9T 3 5 2 Antenna short detection ANT_SHORT_N To set short circuit detect ON CFG HW ANT_CFG_SHORTDET 1 Result MON RF in u center Antenna status OK Antenna power status O...

Страница 20: ...riod receiver will re test the short condition by enabling ANT_OFF LOW If a short is not present it will report antenna condition is ok GNTXT 01 01 02 ANTSTATUS OK 25 MON RF in u center Antenna status...

Страница 21: ...ance activity In order to protect customers against the impact of such outages u blox runs at least two instances of the AssistNow Online Service on independent machines Customers have a choice of req...

Страница 22: ...line Service uses a simple stateless HTTP interface Therefore it works on all standard mobile communication networks that support internet access including GPRS UMTS and Wireless LAN No special arrang...

Страница 23: ...after the other If the communication link is fast and or the receiver is busy trying to acquire new signals it is possible that the internal bu ers will over ow and some messages will be lost In order...

Страница 24: ...section below If this value is not provided the server assumes an accuracy of 300 km Must be in range 0 to 6000000 tacc Numeric seconds Optional The timing accuracy see the Time parameters tacc and la...

Страница 25: ...lient should establish an accurate sense of time itself e g by calibrating its system clock using a local NTP service and then modify the time data received from the service as appropriate 3 7 Clocks...

Страница 26: ...lites but can also be supplied to the receiver via the UBX MGA GPS UTC aiding message By contrast when the receiver has chosen to use the GLONASS time base as its GNSS system time conversion to GPS ti...

Страница 27: ...in the confirmedDate and confirmedTime ags in the UBX NAV PVT message If these ags are set the time validity can be con rmed by using an additional independent source meaning that the probability of...

Страница 28: ...to 0 and e ectively ignored Which master clock the UTC time is referenced to is output in the message UBX NAV TIMEUTC The preferred variant of UTC time can be speci ed using CFG NAVSPG UTCSTANDARD con...

Страница 29: ...the system the rst ambiguous date will be in 2124 Therefore u blox 9 receivers using Protocol Version 24 and above regard the date information transmitted by GLONASS BeiDou and Galileo to be unambiguo...

Страница 30: ...inst a reference timing source In order to get the best timing accuracy with the antenna a xed and accurate position is needed If relative time accuracy between multiple receivers is required do not m...

Страница 31: ...select an appropriate UTC version itself based on the GNSS con guration using in order of preference USNO if GPS is enabled SU if GLONASS is enabled NTSC if BeiDou is enabled and nally European if Ga...

Страница 32: ...e of the generated pulse as soon as receiver has calculated a valid time from a received signal Only used if the corresponding item is set to use another setting in locked mode user delay The cable de...

Страница 33: ...mitigate it Threat u blox solution Over air signal integrity Spoo ng detection mitigation Jamming detection mitigation GNSS receiver integrity Secure boot Secure rmware update Table 11 u blox security...

Страница 34: ...the receiver detects that the noise has risen above a preset threshold the receiver reports Warning If in addition there is no current valid x the receiver reports Critical The monitor has four state...

Страница 35: ...between di erent GNSS the most important step in parsing a UBX RXMSFRBX message is to identify the form of the data This should be done by reading the gnssId eld which indicates which GNSS the data w...

Страница 36: ...10 1 2 2 GPS L2C For GPS L2C signals each reported subframe contains the CNAV message as described in the GPS ICD The ten words are arranged as follows Figure 12 GPS L2C subframe words 3 10 1 3 GLONAS...

Страница 37: ...rds are arranged as follows Figure 13 GLONASS subframe words In some circumstances especially on startup the receiver may be able to decode data from a GLONASS SV before it can identify the SV When th...

Страница 38: ...E5 bl bQ signals both transmit the I NAV message but in di erent con gurations The UBX RXM SFRBX structures for them are as follows 3 10 1 5 1 Galileo E1 C B For Galileo E1 C B signals each reported...

Страница 39: ...ileo E5 bI bQ signals each reported subframe contains a pair of I NAV pages as described in the Galileo ICD Galileo pages can either be Nominal or Alert pages For Nominal pages the eight words are arr...

Страница 40: ...he structure of the eight words will be slightly di erent as indicated by the Galileo ICD 3 10 1 6 SBAS For SBAS L1C A signals each reported subframe contains eight 32 data words to deliver the 250 bi...

Страница 41: ...ssage GNSS Signal gnssId sigId numWords period GPS L1C A 0 0 10 6s SBAS L1C A 1 0 8 1s GPS L2CL 0 3 10 12s GPS L2CM 0 4 10 12s Galileo E1 C 2 0 8 2s Galileo E1 B 2 1 8 2s Galileo E5 bl 2 5 8 2s Galile...

Страница 42: ...ssible See Multiple GNSS assistance Hot start In hot start mode the receiver was powered down only for a short time 4 hours or less so that its ephemeris is still valid Since the receiver does not nee...

Страница 43: ...6 TP1 O Time pulse1 LVCMOS 7 TP2 O Time pulse2 LVCMOS 8 GND Ground Table 14 RCB F9T pin assignment 4 2 Power supply The u blox RCB F9T timing board has two power supply pins VCC and VCC_ANT 4 2 1 VCC...

Страница 44: ...recommends using an active antenna with RCB F9T If an active antenna needs to be implemented in an application case it is recommended that an OEM active antenna module be used that meets our speci ca...

Страница 45: ...d voltage whereas bipolar semiconductors are more susceptible to thermal overstress The following design guidelines are provided to help in designing robust yet cost e ective solutions To avoid overst...

Страница 46: ...0950 1 In addition to external limited power source only Separated or Safety Extra Low Voltage SELV circuits are to be connected to the module including interfaces and antennas For more information ab...

Страница 47: ...self One reason is that the frequency band above 1 GHz is not well regulated with regards to EMI and even if permitted signal levels are much higher than GNSS signal power Notably all types of digital...

Страница 48: ...frequency The main sources are wireless communication systems such as LTE GSM CDMA WCDMA Wi Fi BT etc Measures against out of band interference include maintaining a good grounding concept in the des...

Страница 49: ...ng an antenna patch connect ground of the device When handling the RF pin do not come into contact with any charged capacitors and be careful when contacting materials that can develop charges e g pat...

Страница 50: ...0x2005000c E1 0 UTC UTC time reference Table 16 RCB F9T speci c UART baud rate antenna supervisor and time pulse 1 default con gurations B Glossary Abbreviation De nition ANSI American National Stand...

Страница 51: ...on manual Abbreviation De nition SBAS Satellite based Augmentation System SV Space Vehicle a satellite UBX u blox QZSS Quasi Zenith Satellite System UBX 19003747 R04 Appendix Page 51 of 54 Early produ...

Страница 52: ...on doc no UBX 19003606 3 Radio Resource LCS Protocol RRLP 3GPP TS 44 031 version 11 0 0 Release 11 For regular updates to u blox documentation and to receive product change noti cations please registe...

Страница 53: ...dvance information R02 18 Jun 2019 tkoi Early production information R03 16 Jan 2020 tkoi Early production information Updated type number R04 25 Feb 2020 jhak Updated minimum and maximum gains in Ant...

Страница 54: ...m E mail info_cn u blox com Support support_cn u blox com Regional O ce China Chongqing Phone 86 23 6815 1588 E mail info_cn u blox com Support support_cn u blox com Regional O ce China Shanghai Phone...

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