Emlid REACH RX Manuel de l'opérateur

REACH RX

USER DOCUMENTATION

Firmware version 1.4

Emlid Flow app version 8.4 or newer

June 15, 2023

Table of contents

1 Before you start 3

1.1 Powersupplyandoperation .............................. 3

1.2 ConnectingtoReachRX ................................. 4

1.3 UpdatingReachRXﬁrmware .............................. 5

1.4 Placement ......................................... 5

2 Quickstart 6

2.1 HowRTKworks ...................................... 6

2.2 WorkingwithNTRIPservice............................... 7

2.3 Working with Reach RS2+ base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.4 Working with third-party base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3 Tutorials 13

3.1 Preparing ground control points for PPK UAV mapping . . . . . . . . . . . . . . . 13

3.2 Getting Reach coordinates on Android devices via Bluetooth . . . . . . . . . . . 14

4 Reference 16

4.1 Firmwareﬂashing..................................... 16

4.2 Howtoﬁndserialnumber................................ 16

1 Before you start

1.1 Power supply and operation

Overview

Reach RX has 2 LEDs—Battery LED and Status LED. The Battery LED indicates the battery

charge level and is located above the power button. The Status LED indicates the operating

states of the receiver. The power button is used to turn on and oﬀ the receiver and to check

the battery charge level.

Checking battery charge level

You can check the battery charge level with a short press on the power button. Possible

statuses of the Battery LED are the following:

RX is turned oﬀ

31–100% Solid green

11–30% Solid yellow

1–10% Solid red

0% Blinking red

RX is turned on

31–100% Solid green

11–30% Solid yellow

0–10% Blinking red

RX is charging

100% Solid green

31–99% Blinking green

11–30% Blinking yellow

1–10% Blinking red

Charging Reach RX

Reach RX has a built-in Li-Ion battery providing up to 16 hours of autonomous work when

operating as an RTK network rover. You can power and charge Reach RX over the USB Type-C

cable supplied with the receiver using power supplies like a power bank or USB wall adapter.

Operating receiver

You can check the operating state of the receiver by watching its Status LED. Possible statuses

of the Status LED are the following:

Oﬀ Reach RX is turned oﬀ.

“Breathing” white Reach RX is loading.

Solid light Reach RX is operating. This state can be represented by 3 diﬀerent

colors: white, yellow, and green.

1.2 Connecting to Reach RX

Downloading Emlid Flow

To manage Reach RX, download the Emlid Flow app on your iOS or Android mobile device.

Powering on Reach RX

To power up your Reach RX, follow the steps below:

1. Press the Power button once to display the current charge level. If it’s low, charge the

receiver from a USB wall charger or a power bank using the supplied USB Type–C cable.

2. Hold the power button for a couple of seconds to turn the unit on.

3. Wait until the loading is over, and the Status LED becomes solid white. Learn more

about the Reach RX operating states in the Power supply and operation guide.

Now you can connect to your Reach RX using Emlid Flow.

Connecting to Reach RX

To connect to your Reach using Emlid Flow, follow the steps

below:

1. Enable Bluetooth on your mobile device.

2. Open Emlid Flow and ﬁnd your Reach from the list of

available devices. Once you connect to the receiver, the

Status LED will blink 2 times.

The app will automatically connect to your Reach if no

other receivers are available in the list of devices.

Troubleshooting:

•If your Reach RX has not been detected, make sure that

Bluetooth is turned on and all the permissions are enabled

on your device.

•Some Android devices have the Battery optimization setting

enabled by default. Make sure you disabled it for Emlid

Flow to avoid disconnection.

1.3 Updating Reach RX ﬁrmware

Updating Reach RX ﬁrmware requires a PC or Mac and uses Reach Firmware Flash Tool.

Please, refer to the guide in our oﬃcial online documentation.

1.4 Placement

Clear sky view without any obstacles

Reach needs to have a clear sky view 30°above the horizon. There should be no obstacles

that could block the view like buildings, trees, cars, humans, laptops, etc.

Take a look at 2 pictures below. The left picture demonstrates desirable conditions for Reach

location. The right one is an example of bad surrounding conditions such as the reduced

view of the sky, possible obstructions or vegetation nearby.

Examples of good environments for Reach placement: ﬁeld, top of the hill, rooftop.

Examples of bad environments for Reach placement: indoors, urban area, forestry area.

No electronics nearby

Electronic devices may produce RF noise that could aﬀect the reception of the GNSS signal.

Keep all electronics as far as possible from Reach.

2 Quickstart

2.1 How RTK works

Overview

RTK is a technique used to improve the accuracy of a standalone GNSS receiver. Traditional

GNSS receivers, like the one in a smartphone, could only determine the position with 2–4

meters (7–13 feet) accuracy. RTK can give you centimeter accuracy.

GNSS receivers measure how long it takes for a signal to travel from a satellite to the receiver.

Transmitted signals travel through the ionosphere and atmosphere and are slowed down

and perturbed on the way. For example, travel time on a cloudy day and in clear sky conditions

would be diﬀerent. That is why it is diﬃcult for a standalone receiver to precisely determine

its position. RTK is a technology that solves this issue.

Our YouTube channel has a video that will show you how RTK technology works.

High real-time precision

Two receivers are used in RTK. One of them is stationary, another moves freely. They are

called base station and rover.

The base’s mission is to stay in one place and send corrections to a moving receiver. Rover

uses that data to achieve centimeter precise position. Any number of rovers can connect to

one base if their input settings match the base’s output.

Corrections over NTRIP

You do not necessarily need a second unit for RTK all the time. Usually, there are local services

that share base corrections over the Internet. This technology is called NTRIP.

NTRIP is a good option for areas with strong 3G/LTE coverage and a vast network of NTRIP

bases nearby. In other cases, using the second receiver as a local base station has two advantages:

•autonomy in remote areas as there’s no need in the Internet connection;

•independency from local providers, no additional fees by NTRIP service.

2.2 Working with NTRIP service

Overview

With the help of Emlid Flow, you can easily conﬁgure your Reach RX to receive corrections

from an NTRIP service over Bluetooth. The app uses the internet connection on your phone

or tablet to access network corrections and send them to Reach RX over Bluetooth.

In order to access NTRIP services, you need to register and get a subscription. The cost and

coverage area depends on your NTRIP service provider.

Workﬂow

You can conﬁgure an NTRIP connection on your Reach before the survey. However, to make

sure it receives RTK corrections, you need to provide it with a clear sky view.

Emlid Flow allows you to add an NTRIP proﬁle and apply it for correction input at once. To

conﬁgure correction input on your Reach RX, follow the steps below:

1. Connect to your receiver using Emlid Flow.

2. Tap Correction input and conﬁgure your Reach RX to receive network corrections over

Bluetooth.

3. Tap Add proﬁle and ﬁll in the information from your NTRIP provider.

To ﬁnd out which mount point suits you better, check the website of your NTRIP provider.

Make sure that the baseline doesn’t exceed 60 km (37 mi).

If your NTRIP provider requires information about receiver’s position, such as VRS

service, enable Send receiver’s position to the provider.

4. Tap Save. In a few seconds, your Reach RX will start receiving corrections.

You can add a required number of NTRIP proﬁles and choose between them right on the

Correction input screen later.

Before surveying, make sure your Reach has a clear sky view of at least 30°above the horizon.

There should be no obstacles that could block the view like buildings, trees, cars, humans,

laptops, etc. Learn more about Reach RX placement in the Placement guide.

Viewing results

When you completed your RTK setup, you can watch the current solution status in the top

right corner of the Emlid Flow app or watch the Status LED on your Reach RX:

White SINGLE means that Reach has found a solution relying only on the satellite signals.

In this case, the precision is usually at the meter level.

Yellow FLOAT means that Reach receives corrections from the base station but needs

more time to calculate the solution. In this case, the precision is usually at

the submeter level.

Green FIX means that Reach using the base corrections calculated a solution with

a centimeter precision.

Reach RX gets a ﬁxed solution withing a short period of time. In good environments, it will

take a few seconds. In tough conditions, it may take a little longer. Once the rover gets FIX,

you are all set for surveying.

You can also ﬁnd the current solution status as well as your real-time position on the Status

screen.

2.3 Working with Reach RS2+ base

Overview

With the help of Emlid NTRIP caster, you can combine Reach RS2+ as a base and Reach RX

rover in one setup and pass corrections from Reach RS2+ to Reach RX over the internet.

Make sure that you can provide internet access for both receivers. You can learn more about

Emlid Caster in our oﬃcial online documentation.

Get access to NTRIP credentials

First, you need to get your NTRIP credentials for both Reach RS2+ base and Reach RX rover.

Follow the steps below:

1. Go to caster.emlid.com.

2. Sign up or sign in using your Emlid account.

Once you sign up, you will access the page with NTRIP credentials for both base and rover,

which are generated automatically. From this moment, you can use these credentials to

connect your base and rover to a mount point.

Connect base to a mount point

To connect your Reach RS2+ base to a mount point, follow the steps below:

1. Activate the mount point you want to use by switching on the toggle.

2. Connect to your base via Emlid Flow, go to Base output, and set it up to send corrections

over NTRIP using the obtained credentials (Address, Port, Password, Mount point).

Make sure you conﬁgured your base to output corrections via NTRIP. Once you successfully

connect your base, you will see the ONLINE notiﬁcation next to the mount point name.

Connect your rover to a mount point

1. Access the rover’s credentials. Once you activate the mount point for the base, you

will see it in the rover’s credentials.

2. Connect to your rover via Emlid Flow, go to Correction input, and set it up to get corrections

over NTRIP using the obtained credentials for the rover (Address, Port, Username,

Password, Mount point).

Make sure you conﬁgured your rover to receive corrections from the base via NTRIP. If you

want to add more rovers, repeat the steps above.

Once you successfully connect your rover, you will see the ONLINE notiﬁcation and the number

of the connected rovers in the My rovers section.

To ensure successful corrections transmitting, double-check the credentials you entered on

both base and rover. When you set up and connected both base and rover to the mount

point, you are all set for the survey.

Before surveying, make sure your Reach has a clear sky view of at least 30°above the horizon.

There should be no obstacles that could block the view like buildings, trees, cars, humans,

laptops, etc. Learn more about Reach RX placement in the Placement guide.

When you completed your RTK setup, you can watch the current solution status in the top

right corner of the Emlid Flow app or watch the Status LED on your Reach RX. Learn more

about solution statuses in the Viewing results section.

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