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Copy file name to clipboardExpand all lines: docs/configure_base.md
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The Base Menu allows the user to select between Survey-In or Fixed Base setups.
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[](https://cdn.sparkfun.com/assets/learn_tutorials/1/8/5/7/SparkFun_RTK_Express_-_Base_Menu.jpg)
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[](https://cdn.sparkfun.com/assets/learn_tutorials/1/8/5/7/SparkFun_RTK_Express_-_Base_Menu.jpg)
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*Base Menu Options*
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[](https://cdn.sparkfun.com/assets/learn_tutorials/1/4/6/3/RTK_Surveyor_-_WiFi_Config_-_Base_Config1.jpg)
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*Controlling the type of Base from WiFi AP Config*
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## Mode
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In **Survey-In** mode, the minimum observation time and Mean 3D Standard Deviation can be set. The defaults are 60s and 5m as directed by u-blox. The device will wait for the position accuracy to be better than 1 meter before a Survey-In is started. Don't be fooled; setting the observation time to 4 hours or an initial positional accuracy of 0.3m is not going to significantly improve the accuracy of the survey - use [PPP](https://learn.sparkfun.com/tutorials/how-to-build-a-diy-gnss-reference-station#gather-raw-gnss-data) instead.
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In **Fixed** mode, the coordinates of the antenna need to be sent. These can be entered in ECEF or Geographic coordinates. Whenever a user enters Base mode by pressing the SETUP button the GNSS receiver will immediately go into base mode with these coordinates and immediately begin outputting RTCM correction data.
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[](https://cdn.sparkfun.com/assets/learn_tutorials/1/8/5/7/SparkFun_RTK_Express_-_Display_-_Survey-In.jpg)
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*RTK Facet in Survey-In Mode*
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Once the device has been configured, pressing the Setup button will change the device to Base mode. If the device is configured for *Survey-In* base mode, a flag icon will be shown and the survey will begin. The mean standard deviation will be shown as well as the time elapsed. For most Survey-In setups, the survey will complete when both 60 seconds have elapsed *and* a mean of 5m or less is obtained.
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[](https://cdn.sparkfun.com/assets/learn_tutorials/1/8/5/7/SparkFun_RTK_Express_-_Display_-_FixedBase-Xmitting.jpg)
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*RTK Facet in Fixed Transmit Mode*
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Once the *survey-in* is complete the device enters RTCM Transmit mode. The number of RTCM transmissions is displayed. By default this is one per second.
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The *Fixed Base* mode is similar but uses a structure icon (shown above) to indicate a fixed base.
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## NTRIP Server
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**NTRIP** is where the real fun begins. The Base needs a method for getting the correction data to the Rover. This can be done using radios but that's limited to a few kilometers at best. If you've got WiFi reception, use the internet!
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*Settings for the NTRIP Server*
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[](https://cdn.sparkfun.com/assets/learn_tutorials/1/4/6/3/RTK_Surveyor_-_WiFi_Config_-_Base_Config2.jpg)
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*Configuring NTRIP Server settings via WiFi Config AP*
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This is a powerful feature of the RTK line of products. The RTK device can be configured to transmit its RTCM directly over WiFi to the user's mountpoint. This eliminates the need for a radio link.
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Once the NTRIP server is enabled you will need a handful of credentials:
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*NTRIP Server Connected!*
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With these credentials set, RTK device will attempt to connect to WiFi, your caster of choice, and begin transmitting the RTCM data over WiFi. We tried to make it as easy as possible.
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[](https://cdn.sparkfun.com/assets/learn_tutorials/1/8/5/7/SparkFun_RTK_Express_-_Display_-_FixedBase-Casting.jpg)
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*RTK Facet in Transmit Mode with NTRIP Enabled*
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If the NTRIP server is enabled the device will first attempt to connect over WiFi. The WiFi icon will blink until a WiFi connection is obtained. If the WiFi icon continually blinks be sure to check your SSID and PW for the local WiFi.
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Once WiFi connects the device will attempt to connect to the NTRIP mount point. Once successful the display will show 'Casting' along with a solid WiFi icon. The number of successful RTCM transmissions will increase every second.
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[](https://cdn.sparkfun.com/assets/learn_tutorials/1/4/6/3/RTK_Surveyor_-_Device_Configuration_-_NTRIP_Server_Broadcasting_Bytes_v11.jpg)
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Every second a few hundred bytes, up to ~2k, will be transmitted to your mount point.
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Note: During NTRIP transmission WiFi is turned on and Bluetooth is turned off. You should not need to know the location information of the base so Bluetooth should not be needed. If necessary, USB can be connected to the USB port to view detailed location and ZED-F9P configuration information.
*The most common settings on the RTK Device WiFi AP Config*
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## Measurement Frequency
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Measurement Frequency can be set by either Hz or by seconds between measurements. Some users need many measurements per second; the RTK Facet supports up to 20Hz with RTK enabled. Some users are doing very long static surveys that require many seconds between measurements; RTK Facet supports up to 8255 seconds (137 minutes) between readings.
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Measurement Frequency can be set by either Hz or by seconds between measurements. Some users need many measurements per second; RTK devices support up to 20Hz with RTK enabled. Some users are doing very long static surveys that require many seconds between measurements; RTK devices support up to 8255 seconds (137 minutes) between readings.
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Note: When in base mode, measurement frequency is set to 1Hz. This is because RTK transmission does not benefit from faster updates, nor does logging of RAWX for PPP.
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Note: When in **Base** mode, measurement frequency is set to 1Hz. This is because RTK transmission does not benefit from faster updates, nor does logging of RAWX for PPP.
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## Dynamic Model
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The Dynamic Model can be changed but it is recommended to leave as *Portable*. For more information, please refer to the [ZED-F9P Integration Manual](https://cdn.sparkfun.com/assets/learn_tutorials/1/8/5/7/ZED-F9P_IntegrationManual__UBX-18010802_.pdf).
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## Constellations Menu
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[](https://cdn.sparkfun.com/assets/learn_tutorials/2/1/8/8/SparkFun_RTK_ExpressPlus_Receiver_Constellations.jpg)
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*Enable or disable the constellations used for fixes*
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## Constellations Menu
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The ZED-F9P is capable of tracking 184 channels across four constellations and two bands (L1/L2) including GPS (USA), Galileo (EU), BeiDou (China), and GLONASS (Russia). SBAS (satellite-based augmentation system) is also supported. By fault, all constellations are used. Some users may want to study, log, or monitor a subset. Disabling a constellation will cause the ZED to ignore those signals when calculating a location fix.
From this menu a user can control the output of various NMEA, RTCM, RXM, and other messages. Any enabled message will be broadcast over Bluetooth *and* recorded to SD (if available).
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Because of the large number of configurations possible, we provide a few common settings:
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* Reset to Surveying Defaults (NMEAx5)
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* Reset to PPP Logging Defaults (NMEAx5 + RXMx2)
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* Turn off all messages
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* Turn on all messages
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* Turn off all messages (serial command only)
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* Turn on all messages (serial command only)
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## Reset to Surveying Defaults (NMEAx5)
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## Turn off all messages
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This will turn off all messages. This is handy for advanced users who need to start from a blank slate.
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This will turn off all messages. This is handy for advanced users who need to start from a blank slate. This setting is only available over serial configuration.
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## Turn on all messages
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This will turn on all messages. This is a setting used for firmware testing and should not be needed in normal use.
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This will turn on all messages. This is a setting used for firmware testing and should not be needed in normal use. This setting is only available over serial configuration.
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[](https://cdn.sparkfun.com/assets/learn_tutorials/1/8/5/7/SparkFun_RTK_Express_-_Messages_Menu_-_NMEA.jpg)
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**Note:** The message report rate is the *number of fixes* between message reports. In the image above, with GSV set to 4, the NMEA GSV message will be produced once every 4 fixes. Because the device defaults to 4Hz fix rate, the GSV message will appear once per second.
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Each message rate input controls which messages are disabled (0) and how often the message is reported (1 = one message reported per 1 fix, 5 = one report every 5 fixes). The message rate range is 0 to 20.
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## ESF Messages
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The ZED-F9R, found only on the Express Plus, supports additional External Sensor Fusion messages. These messages show the raw accelerometer and gyroscope values of the internal IMU.
The RTK Facet has a 0.96" high-contrast OLED display. While small, it packs various situational data that can be helpful in the field. We will walk you through each display.
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### Power On/Off
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[](https://cdn.sparkfun.com/assets/learn_tutorials/2/1/8/8/SparkFun_RTK_Facet_-_Display_On_Off.jpg)
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*RTK Facet Startup and Shutdown Screens*
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Press and hold the power button until the display illuminates to turn on the device. Similarly, press and hold the power button to turn off the device.
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### Rover Fix
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[](https://cdn.sparkfun.com/assets/learn_tutorials/2/1/8/8/SparkFun_RTK_Facet_-_Main_Display_Icons.jpg)
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*Rover with location fix*
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Upon power up the device will enter either Rover mode or Base mode. Above, the Rover mode is displayed.
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***MAC:** The MAC address of the internal Bluetooth module. This is helpful knowledge when attempting to connect to the device from your phone. This will change to a Bluetooth symbol once connected.
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***HPA:** Horizontal positional accuracy is an estimate of how accurate the current positional readings are. This number will decrease rapidly after first power up and settle around 0.3m depending on your antenna and view of the sky. When RTK fix is achieved this icon will change to a double circle and the HPA number will decrease even further to as low as 0.014m.
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***SIV:** Satellites in view is the number of satellites used for the fix calculation. This symbol will blink before a location fix is generated and become solid when the device has a good location fix. SIV is a good indicator of how good of a view the antenna has. This number will vary but anything above 10 is adequate. We've seen as high as 31.
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***Model:** This icon will change depending on the selected dynamic model: Portable (default) Pedestrian, Sea, Bike, Stationary, etc.
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***Log:** This icon will remain animated while the log file is increasing. This is a good visual indication that you have an SD card inserted and RTK Facet can successfully record to it.
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### Rover RTK Fix
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[](https://cdn.sparkfun.com/assets/learn_tutorials/1/8/5/7/SparkFun_RTK_Express_-_Display_-_Rover_RTK_Fixed.jpg)
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*Rover with RTK Fix and Bluetooth connected*
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Once NTRIP is enabled on your phone or RTCM data is being streamed into the **Radio** port the device will gain an RTK Fix. You should see the HPA drop to 14mm with a double circle bulls-eye as shown above.
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### Base Survey-In
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[](https://cdn.sparkfun.com/assets/learn_tutorials/1/8/5/7/SparkFun_RTK_Express_-_Display_-_Survey-In.jpg)
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*RTK Facet in Survey-In Mode*
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Pressing the Setup button will change the device to Base mode. If the device is configured for *Survey-In* base mode, a flag icon will be shown and the survey will begin. The mean standard deviation will be shown as well as the time elapsed. For most Survey-In setups, the survey will complete when both 60 seconds have elapsed *and* a mean of 5m or less is obtained.
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### Base Transmitting
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[](https://cdn.sparkfun.com/assets/learn_tutorials/1/8/5/7/SparkFun_RTK_Express_-_Display_-_FixedBase-Xmitting.jpg)
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*RTK Facet in Fixed Transmit Mode*
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Once the *survey-in* is complete the device enters RTCM Transmit mode. The number of RTCM transmissions is displayed. By default this is one per second.
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The *Fixed Base* mode is similar but uses a structure icon (shown above) to indicate a fixed base.
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### Base Transmitting NTRIP
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If the NTRIP server is enabled the device will first attempt to connect over WiFi. The WiFi icon will blink until a WiFi connection is obtained. If the WiFi icon continually blinks be sure to check your SSID and PW for the local WiFi.
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[](https://cdn.sparkfun.com/assets/learn_tutorials/1/8/5/7/SparkFun_RTK_Express_-_Display_-_FixedBase-Casting.jpg)
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*RTK Facet in Transmit Mode with NTRIP*
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Once WiFi connects the device will attempt to connect to the NTRIP mount point. Once successful the display will show 'Casting' along with a solid WiFi icon. The number of successful RTCM transmissions will increase every second.
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Note: During NTRIP transmission WiFi is turned on and Bluetooth is turned off. You should not need to know the location information of the base so Bluetooth should not be needed. If necessary, USB can be connected to the USB port to view detailed location and ZED-F9P configuration information.
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