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Selected Q & A: solution and base compatibility

Q:

  1. Hi, what L1 board do you have inside?
  2. Will it work with Emlid base station?

A:

  1. It uses SkyTraq S1216F8-RTK board inside.

  2. Alpha works with EMLID REACH. Visit https://www.polaris-gnss.com/blog/rtk-base-compatibility for details.

You say the Alpha will work with an EMLID REACH as a base station?

The EMLID REACH usually sends out it’s base corrections via it’s built in Radio, which it describes as
a long-range radio (LoRa 868/915 MHz for reliable correction on distances up to 8 km.)

Is there a similar radio which could be used with the Alpha, to receive those signals?

Alpha will work with ublox NEO-M8P and NEO-M8T based RTK base station, which also includes EMLID REACH products

We haven’t had chance to test Alpha working with REACH RS over Lora. If simply Googling for Lora radio solution, some solutions like below readily turns up; we don’t know if the radio will work OK or not though.

https://www.aliexpress.com/store/product/Free-Sample-Long-Range-LoRa-SX1276-915MHz-8000m-Transceiver-Module-E44-TTL-1W-Original-CDSENET-Wireless/2798183_32804251607.html?spm=2114.search0204.3.59.793e778fvAvvuY&ws_ab_test=searchweb0_0,searchweb201602_2_10065_10068_10059_10884_10887_10696_100031_10084_10083_10103_10618_10307,searchweb201603_45,ppcSwitch_5_ppcChannel&algo_expid=2203a426-acbc-4480-9371-ad1f5d568895-9&algo_pvid=2203a426-acbc-4480-9371-ad1f5d568895&priceBeautifyAB=0

https://www.aliexpress.com/store/product/2PCS-LoRa-radio-node-1-0-915-MHz-RFM95-SX1276-wireless-node-module-Hbm0090/316387_32897667355.html?spm=2114.search0204.3.143.793e778fvAvvuY&ws_ab_test=searchweb0_0,searchweb201602_2_10065_10068_10059_10884_10887_10696_100031_10084_10083_10103_10618_10307,searchweb201603_45,ppcSwitch_5_ppcChannel&algo_expid=2203a426-acbc-4480-9371-ad1f5d568895-21&algo_pvid=2203a426-acbc-4480-9371-ad1f5d568895&priceBeautifyAB=0

does it work with this radio?

Have not used that before. Minimum sustained data rate needed is 19200bps using RTCM for base data transmission. If it meets such requirement then likely usable.

We have used:
https://www.digi.com/products/embedded-systems/digi-xbee/rf-modules/sub-1-ghz-modules/xbee-pro-900hp

Have seen customer using:
https://www.digi.com/products/embedded-systems/digi-xbee/rf-modules/sub-1-ghz-modules/xtend-module

which the distance achieved with it?

This will depend signal quality/condition and ionospheric activity level. Expect to use within 30km for normal usage situations. We have gotten 50Km ~ 60Km range at some time of the day. Below customer has gotten 80Km range at some time.

Maximum baseline won’t be a real issue if you can setup your local RTK base to work with RTK rover. You can always use online PPP service to determine your base position then use the locally setup base to work with rover. Mobile base can use below techniques:

https://www.polaris-gnss.com/blog/ntrip-server-for-android-phone

Another related:

https://www.polaris-gnss.com/blog/surveying-at-place-without-internet-or-mobile-phone-coverage

Trimble GNSS Planning has a useful ionospheric index plot under Charts, https://www.gnssplanning.com/ At time when ionospheric index is low, longer baseline operating range can be expected, shorter baseline operating range at time with high index. This ionospheric index characteristic vary from region to region and solar activity throughout the year.

Hello Lee.

  1. Your evidence and explanation for the ionosphere is very similar to one of our GNSS expert comments: “The GNSS RTK receiver works better at night.”
  2. Through this, we will know how to best time the GNSS RTK measurement.
  3. Mobile establishments may use the following techniques:
    https://www.polaris-gnss.com/blog/ntrip-server-for-android-phone
    https://www.polaris-gnss.com/blog/surveying-at-place-without-internet-or-mobile-phone-coverage
    https://www.polaris-gnss.com/shop-product-fullwidth/alpha-rtk-kit[5]?previous_url_id=0
    Very cost effective and very optimal.
    Thanks Lee.
    Mr. Tran