Instrukcja obsługi AZUS2. AzusRTN is not associated with any controller and postprocessing...

GeoDigitalGNSS

Contents: I. Introduction…………………………………………………………2

II. Survey ……………………………………………………………...3

III. Receiver Settings……………………………………………………5

IV. Rapid Static…………………………………………………………9

V. RTN ……………………………………………………………….10

VI. RTK………………………………………………………………...12

VII. Preprocessung….………………………………………………...…17

VIII. Postprocessing (introduction)..……………………….…………….20

IX. AzusRTN Technical Specification………………….…….……..…22

X. Notes and Detailed Advice.…..…………………………………….25

XI. Final Remarks…………………………………………. ….…….…26

Attachments as a bonus to the purchased receiver: 1) RTN and RTK by controller RTK_PowerGPS (ver. 1.0) 2) AzusRTN postprocessing RS (Rapid Static) ver. 1.1.1

AzusRTN User manual

wersja 1.1.2

by Dr Eng. Ryszard Pażus 2018-07-15

_______________________________________________________________ Instrukcja obsługi odbiornika AzusStar+

GeoDigitalGNSS Ryszard Pażus, http://www.geodigitalgnss.pl

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I. Introduction 1. AzusRTN is a satellite receiver designed for surveying using the RTN (Real Time Network)

method.

The manual does not describe other possible applications, such as follows: RTK, for

GIS (Geographic Information Systems), PPK, Moving Base RTK, Mapping,

Robotics, Precision Farming.

A full documentation of possibilities other than those described in this manual can be

found in the description of EMLID, the manufacturer of the Reach RTK module, used

in the AzusRTN receiver.

For other applications than surveying, an alternative is the receivers and modules

offered by EMLID, designed for navigation needs, mainly for drone users.

Unfortunately, without the required necessary know-how for surveyors as the end

users..

Users of the Reach RTK module have a very numerous forum, thoroughly describing

all doubts (run in English).

2. AzusRTN is not associated with any controller and postprocessing software. It is assumed,

however, that the most popular controller will be an Android application and postprocessing

will, in turn, require a laptop or a desktop computer with Windows.

3. The attached examples use the Open Source Initiative software (RTKLIB, EMLID) and the

legacy software. This is because the goal is to show the solution to the task. In small

companies with a specific profile, comprehensive software is not necessary (includes

modules that are useless for the company).

4. For the description of RTN and RTK surveying, the following sources were used:

EMLID, the producer of the Reach RTK module used in AzusRTN,

RTKLIB by Tamoji TAKASU (Research and Development of Precise Positioning

Technology by Global Navigation Satellite System) distributed as the Open Source

clause Initiative BSD2.

GNNS Solutions, Ashtech - Magellan, currently Spectra Precision-Trimble.

PowerGPS software from SkyRaster as an example of the controller on Android.

CSRS-PPP Online Computation

http://www.geodigitalgnss.pl/

https://www.ngs.noaa.gov/PUBS_LIB/NGSGuidelinesForRealTimeGNSSNetworks.pdf

https://www.ngs.noaa.gov/PUBS_LIB/NGSGuidelinesForRealTimeGNSSNetworks.pdf

https://docs.emlid.com/reachm-plus/

https://emlid.com/

https://community.emlid.com/

https://docs.emlid.com/reach/

http://www.rtklib.com/rtklib.htm

https://opensource.org/licenses/bsd-license.php

https://opensource.org/licenses/bsd-license.php

ftp://ftp.ashtech.com/Spectra-precision/Legacy/Land Survey/GNSS Solutions/software/3.80.8/

http://powergps.pl/

http://www.nrcan.gc.ca/earth-sciences/geomatics/geodetic-reference-systems/tools-applications/10925#ppp

http://www.nrcan.gc.ca/earth-sciences/geomatics/geodetic-reference-systems/tools-applications/10925#ppp



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II. Survey

1. 2. You are required position of the receiver site (or a specific point) without significant

obstructions, interfering the reception of satellite signals. For example, when choosing a

place for a point in Poland, it should be remembered that from the northern part of Poland

there is a dead zone without GPS and GLONASS satellites.

3. The height of the phase center from the receiver base equals

0.080 m

This height should be taken into account when measuring over the measuring point.

The antenna used is not present in the collections of antennas

calibrated by calibration services. Here, the calibration was done

by the manufacturer. The accuracy of the phase centre is +/- 2mm

with the elevation mask 12o.

4. Power on the receiver lit LED signal. The flicker color sequence of the

LED is described on the EMLID pages. The diode in AzusRTN is a fiber optic derivation of a tri-color RGB diode (red, green, blue). After the

initial start-up sequence of the Reach View application, the most

important LED signals are: synchronization of the oscillator (white

color), Wi-Fi in AP mode (green) or in client mode (blue).

5. When turned on, the receiver tries to connect to known Wi-Fi networks

that have been declared in memory. If he cannot find any, he will create

his own AP (Access Point, host), often called a hotspot, although the

term 'hotspot' is rather the area within the AP's access point. Other words

for the host are Wi-Fi, router, etc.

6. AzusRTN will create a Wi-Fi hotspot the first time you start it. In the list of Wi-Fi networks on your smartphone, tablet, computer (laptop) will

appear a network called azusrtn ?? (e.g., azusrtn22: 66: ac). The network

will be displayed as 'Murata Manufacturing'. The network password for


https://docs.emlid.com/reach/led-status/



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the receiver is azusrtn ?? (the example on the smartphone in the Fing application is the

password: azusrtn22).

7. The description of the ReachView application is also on the manufacturer's website of the

Reach module (Introduction). The ReachView application also plays the role of a controller,

but it is not practical for the surveyors. The reason is the lack of transformation into: spatial

reference system, cartographic projectiom and taking into account the geoid (or quasigeoid)

model for determining orthometric (or normal) heights. We get only optional: geocentric coordinates XYZ or φ, λ, h (ellipsoidal) at WGS84 for the observation epoch.




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III. Receiver settings

1. We have nine tabs 'Menu' button and the Settings for the configuration of the

receiver.

2. In the 'Settings', at the beginning, is the information about which version of the application

is installed and (important) whether it is a stable version or a trial version. For our purpose,

test versions is not recommended.

In the further part of this tab, we have the option of generating a report on the current

configuration. It is important in querying problems in the case of technical support.

We can also change the user name and password and, if necessary, return to the initial

settings (default).




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3. In the Logging tab, we have a full list of our logins with a record of observation files that we

can download for further elaboration.

If before the survey we performed some tests and trials, it is good to temporarily switch 'On' to 'Off' which will separate the saved files and place the starting point. We

leave the file deletion for later. If you accidentally click on the delete icon, you can

delete the "Delete" command until you disconnect the connection with the receiver.

Selecting the formats of saved files is done through the drop-down menus:

4. In the Wi-Fi / Bluetooth fold, we should enter the AP access points that we will use during

the measurement with our receiver.




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For example:

5. Optionally, because this is not a necessary step to start the survey, we open

the 'New project' in the 'Survey' fold.




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IV. Rapid Static

1. The Rapid Static (RS) procedure of the survey is the simplest and most accurate

measurement that we can make with the AzusRTN receiver. If there are not too many

obstacles that cover the open horizon, a short session, about 20 minutes, will suffice to

obtain accurate results. If there are more of them, the measuring session needs to be extended. Horizontal coordinate accuracy is then on the order of a few, at most a dozen or so

millimeters. Accuracy in height is limited by the geoid model (quasigeoid). To obtain such

results, postprocessing is required according to the enclosed instructions.

2. Performing a measurement is a simple activity. After setting the receiver over the designated

point, we measure the height to the antenna reference point and add 80mm to the phase

center of the antenna (ARP + 0.080m) and switched ‘on’ the receiver for the duration of the

session, after which the receiver is switched ‘off’. 3. The required configuration is:

In the 'RTK settings' we set: ‘Static’, ‘Continuous’ recording, elevation mask 12o for our antenna, parameter of acceptable interference SNR <35, satellite systems: GPS,

GLONASS, GALILEO and SBAS, frequency 1Hz

In 'Logging', we record observations in the UBX binary format. RINEX does not

provide the possibility of a more detailed analysis if there are any disturbances in the

session.

4. Postprocessing is described in the apendix. As a result, we receive a report with an

assessment of the accuracy of the point determination, assuming the VRS faultless. and separate VRS accuracy evaluation. The accuracy of VRS is based on the PPP (Precise Point

Positioning) method, the Canadian CSRS-PPP system, i.e. our accuracy towards reference

stations as relative is better.




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V. RTN 1. RTN survey requires a controller that is a program that meets the requirements of the

procedure. There are many such programs, including free of charge.

2. The manual describes only the procedure using ReachView and, for example, the SkyRaster

PowerGPS controller.

3. An example of a RTN survey using ReachView. Location with a tree from the south side.


http://powergps.pl/

http://powergps.pl/



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4. An example of a RTN survey using RTK PowerGPS software (description of individual

screen shots is in the manual here):


http://powergps.pl/instrukcja



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VI. RTK

1. An example of AzusRTN as 'rover', in which the fixed point 'base' is far away from the area

being surveyed. The available IGS reference station is located approx. 20 km away. This is

an example for the purpose of this manual. In practice, this method can be used for reference

stations much closer to the measuring points.

2. For ‘RTK Settings’:

choose the closest reference station, here is JOZ2 IGS network, or in the 'Correction input' to take the network address and port, select from the drop-down menu JOZ2

station (in the application is JOZ200POLO)




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We have an fixed solution (fix) for a 20 km vector, which is rather rare, i.e. it is not

necessary to draw far-reaching conclusions.

Recording of the measurement is available in the 'Logging' tab.




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The same on the smartphone as a controller. 'Status' shows that our 'rover' with 29

satellites in the observation field can refer to 21 references (the screen does not show

all)

3. In turn, the same example using PowerGPS apps Without the description, I attach

screenshots:




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The coordinates of this reference point (SPXE) is 488794.866, 628134.543 so

compatibility (delta): 0.002m and 0.015M




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VII. Preprocessing

The program for preprocessing is taken from EMLID or RTKLIB. It is

recommended to download from EMLID, where the program is updated.

2. Pre-processing example:

We enter the file of our observations in binary .ubx format


https://docs.emlid.com/reach/common/tutorials/gps-post-processing/

https://github.com/tomojitakasu/RTKLIB/tree/rtklib_2.4.3



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As' Options' we choose: RINEX version, name of the point consisting of four alphanumeric characters (RINEX Name), select required items exactly as in the example (Satellite Systems, types of observations, frequency only L1, 'Iono Corr', 'Leap Sec ',' Marker Name ',' Delta N '(height above point to ARP + 0.080m) ->'

OK ':

-> Convert

Z naszego pliku binarnego *.UBX utworzą się pliki tekstowe, jak tutaj w przykładzie,

dla punktu o nazwie SPYC:




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• RINEX obs. starts with such a header (example SPYC point):

The program presets the initial settings. The next sessions will only require changes in the names of points and heights above the measuring point.

Only short post-processing remains, described in a separate chapter. This post-

processing is required due to the necessity of: converting to a spatial reference system, including mapping projection, converting the height to the altitude system

applicable in a given area. The module manufacturer has for some time ensured that these

conversions will be implemented in the new version of the Reach firmware (EMLID).

3. It is recommended that immediately after generating the RINEX file send observations for pre-checks to the Canadian CSRS-PPP system. The system is free, open to all interested

parties. The only condition for using it is to clearly document this source of origin. Our goal

is formal control of the measurement performed using the PPP method, i.e. without

reference to the reference stations. Accuracy is irrelevant here, because postprocessing

decides about it.




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VIII. Postprocessing (introduction)

1. Postprocessing is described in appendix.

2. The most commonly used reference station systems:

3.

4.




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5. International GNSS Service (IGS)




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6. US National Geodetic Survey (CORS)

7. Others, not listed here.




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IX. AzusRTN Technical Specification

1. The receiver module uses REACH RTK GNSS firmware EMLID, based on studies

RTKLIB (An Open Source Program Package for GNSS Positioning) Japanese p. Tamoji

Takasu.

72 channels: GPS L1, GLONASS G1, Galileo E1, SBAS, BeiDou B1, QZSS L1 - the manufacturer of the card is a Swiss company U-blox SA,

Frequency: 0.1Hz, 1Hz, 5Hz, 10Hz, 14Hz

data storage with a capacity of 2GB

communications: Wi-Fi, Bluetooth, optional radio communication port for USB devices that meet the criteria of formal-legal,

interface: port USB, UART, event

internal power supply: Li-Ion battery capacity of 7.2V 5.2Ah

temperature / storage from -20 ° C to + 65 ° C

dustprotected / waterproof IP67 (usb socket IP65)

2. Dimensions / weight: (12 x 12cm) x 8,5cm / 800g (including antenna)

3. The receiver is placed on a pole with a 5/8 "screw or on a base for mounting in a universal type tribrach.

4. Antenna


http://www.rtklib.com/

http://www.rtklib.com/



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ARP (Antenna Reference Point) = 0.080m

Stabilność centrum fazowego PCV (Phase Center Variation) +/-2mm (1 sigma)

Zależność PCV od azymutu (phi) jest bardzo mała i nie przekracza wielkości 0.7mm

High phase center stability PVC (Phase Center Variation) +/- 2mm (1 sigma)

azimuth dependence of PVC (phi) does not exceed 0.7mm

enhanced multipath signal exclusion (multipath)

down quickly gain control near the ground

interference rejection filtered by dielectric filter




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5. Receiver clock (oscillator) in terms of precision of 2-3 nanoseconds, which for example one

of the receivers shows the red line (sigma - report the Canadian system CSRS-PPP). Time is

synchronized with the GPS system or the internet via Wi-Fi when the receiver is turned on.

6. The receiver is a precision instrument designed to work in difficult terrain conditions. Like any such type of instrument, it requires proper care. The interior of the receiver does not contain any elements that require servicing. Only the battery life can be limited and after some time, it is assumed that after several years of intensive use, it will require replacement. It is recommended to periodically recharge the battery every few weeks if the receiver is not used.

7. The receiver is powered by a battery placed inside the receiver. The voltage drop of this battery to the minimum acceptable level is signaled by sound (squeaking); after which (about 10 minutes) the receiver switches off automatically. A fully charged battery lasts about 25 hours of measurement.

Charging the battery signals the LED in orange. The full charge cycle of a fully discharged battery takes about 9 hours. Turning off the LED indicates the end of the

charging cycle. The flickering of the diode informs about the disconnection of

charging without full charge (exceeding the charging time to more than 16 hours).

8. W komplecie jest zasilacz do ładowania akumulatora (ładowarka jest wewnątrz odbiornika). Opcjonalnie można ładować z gniazda zapalniczki samochodowej.

9. Manual and configuration files for post-processing programs in electronic form (CD or USB

memory stick).

10. The receiver is supplied without a transport box and does not require such a box for

transport.


https://geodigitalgnss.pl/image/public/4accf4a0-f326-11e7-a92f-525400d183e6_hd_2018-01-06-21-43-46.jpg?tag=173207



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X. Notes and detailed advice

1. Sessions for a RS (Rapid Static) method are most conveniently surveyed in a time group that

is easy to post-process in one adjustment by generating a VRS, one or more, covering the

entire measurement period.

2. Ordering VRS from the services is very simple. From the header of the RINEX file of our

point, we copy approximate coordinates. For this position, the service will automatically

generate virtual observations from measurements made at the reference stations.

3. VRS stations should be generated at least from a period longer than about 1.5 hours with an

interval of 1 second. By using EUREF and IGS, VRS stations are created from the almost 24-hour period because the reference stations are with an interval of 30 seconds. There is

also a need for extending our sessions.

4. The accuracy of our heights is determined, first of all, by the accuracy of the geoid model

(area diversified).

XI. Final remarks

1. The necessary condition for obtaining correct results from surveying is to meet the

instructions described in this manual.

2. The producer of the AzusRTN receiver does not bear any responsibility regarding the

quality of measurements resulting from changes in the technical conditions of receiving

GNSS signals caused by:

operational degradation of the GNSS (systems) by its owner (operational degradation),

deterioration of ionospheric and tropospheric conditions,

improper geometry of the satellites resulting from terrain obstacles,

the influence of local electromagnetic interference,

effect of signal multitrack,

inadequate post-processing and coordinate transformation procedures,

non-compliance with applicable technical standards regarding surveying.


Instrukcja obsługi AZUS2. AzusRTN is not associated with any controller and postprocessing...

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