e-survey CORS System Net 20 Plus User manual

CORS System
NET20 Plus User Guide
V2.0
Shanghai eSurvey GNSS Co., Ltd.

SHANGHAI ESURVEY GNSS CO., LTD.
Copyright © Shanghai eSurvey GNSS Co., Ltd. 2022. All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means
without prior written consent of Shanghai eSurvey GNSS Co., Ltd.
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and other eSurvey trademarks are trademarks of Shanghai eSurvey
GNSS Co., Ltd.
All other trademarks and trade names mentioned in this document are the property of their
respective holders.
Notice
The purchased products, services and features are stipulated by the contract made between
eSurvey and the customer. All or part of the products, services and features described in
this document may not be within the purchase scope or the usage scope.
The information in this document is subject to change without notice. Every effort has been
made in the preparation of this document to ensure accuracy of the contents, but all
statements, information, and recommendations in this document do not constitute a
warranty of any kind, express or implied.

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Contents
1Technical Specification..............................................................................................2
1.1 Overview ..............................................................................................................2
1.2 Main features .......................................................................................................2
1.3 Technical Specifications.....................................................................................2
1.3.1 Physical..............................................................................................................2
1.3.2 Environmental....................................................................................................2
1.3.3 Electrical ............................................................................................................2
1.3.4 GNSS.................................................................................................................2
1.3.5 Ports ..................................................................................................................3
1.3.6 Data and Storage...............................................................................................3
2Hardware Structure ....................................................................................................4
2.1 Receiver Appearance..........................................................................................4
2.1.1 Front Panel ........................................................................................................4
2.1.2 Back panel.........................................................................................................5
2.2 Structural drawings / mounting dimensions.....................................................6
3WEB UI.........................................................................................................................7
3.1 Summary..............................................................................................................7
3.2 System Information.............................................................................................8
3.2.1 System Information............................................................................................8
3.2.2 GPS Status........................................................................................................9
3.2.3 Satellites ............................................................................................................9
3.2.4 Data Transmission...........................................................................................10
3.2.5 Data Recording................................................................................................10
3.3 Configuration.....................................................................................................11
3.3.1 Reference Station............................................................................................11
3.3.2 GNSS configuration.........................................................................................12
3.3.3 Tracking satellites............................................................................................12
3.3.4 Network............................................................................................................13
3.3.5 Ntrip Server......................................................................................................14
3.3.6 Recording.........................................................................................................15
3.3.7 Port Configuration............................................................................................16
3.3.8 Alerts................................................................................................................20
3.3.9 Registration......................................................................................................20
3.4 Download ...........................................................................................................21
3.5 System Management.........................................................................................21
3.6 Help.....................................................................................................................22
4Operation...................................................................................................................23
4.1 Power on ............................................................................................................23
4.2 Quick setting......................................................................................................24
5Accessories ..............................................................................................................28

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CAUTION
Ignoring this indication and making an operation error could possibly result in personal injury
orpropertydamage.
Do not perform disassembly which may cause fire, electric shock or burn. Only eSurvey
authorizeddistributorscandisassembledevice.
Do not cover the charger which may causes fire.
Donotusedefectionpowercable,socketorplugwhichmaycausefire, electronic shock.
Donotuse wet charger which maycause fire, electronic shock.
Do not close the instrument to burning gas orliquid
Donotputthebatteryinthefireorhightemperatureconditionwhich may causeexplosion.
Do notuse the batterywhich is notspecified byeSurvey.
DonotusethepowercablewhichisnotspecifiedbyeSurvey.Fire could result.
Do not short circuit of the battery. Fire could result.
When this product encounters disturbance of severe Electrostatic Discharge,perhapsit
willhavesomedegradationofperformancelikeswitching on/off automatically and so on.

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1 Technical Specification
1.1 Overview
NET20 Plus is a high-precision CORS reference station receiver. LINUX system as its
development platform, and it supports for secondary development. It has powerful and
stable function, and can be used in many fields.
1.2 Main features
All aluminum alloy body design, strong and reliable, can cope with all kinds of harsh
outdoor environment
336 (NET20 Plus-T) / 800 (NET20 Plus-H) channels with Multi-constellation GNSS
Superior carrier phase observations of less than 1mm accuracy
Internal battery for more than 12 hours operation.
4G LTE and Bluetooth / WLAN datalink support.
Easy configuration from web UI and remote server.
NTRIP server/caster support.
With IP67 protection
1.3 Technical Specifications
1.3.1 Physical
Weight: 2 KG
Dimension: 222 mm * 164 mm * 79 mm
1.3.2 Environmental
Operating temperature: -30℃- +65℃
Storage temperature: -40℃- +80℃
Humidity: Up to 100% (non-condensing)
1.3.3 Electrical
Input: 9-28V
Power: 2.8W
1.3.4 GNSS
NET20 Plus-H
Channels: 800
Tracking signals:
GPS: L1 C/A, L1P,L1C,L2P, L2C, L5
GLONASS: G1,G2,G3
BeiDou: B1I, B2I, B3I,B1C,B2a,B2b,ACEBOC
Galileo: E1, E5a, E5b, E5 AltBOC, E6
IRNSS: L5
SBAS: L1, L5
QZSS: L1 C/A, L1C, L2C, L5,LEX
L-Band: Atlas H10/H30/Basic

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NET20 Plus -T
Channels: 336
Tracking signals:
GPS: L1 C/A, L2E, L2C, L5
GLONASS: L1 C/A, L2C/A, L3 CDMA
BeiDou: B1, B2, B3
Galileo: E1, E5a, E5b, E5 AltBOC, E6
NAVIC: L5
SBAS: L1CA, L5
QZSS: L1 C/A, L1SAIF, L1C, L2C, LEX
L-Band: OmniSTAR, RTX
Positioning accuracy Table 1-1 Positioning accuracy
Positioning mode
Accuracy
Horizontal
Vertical
Static
2.5mm + 1ppm
5mm + 1ppm
RTK
8mm + 1ppm
15mm + 1ppm
DGPS
0.25m + 1ppm
0.5mm + 1ppm
Initializationtime: ＜10s
Initializationreliability: ＞99.9%
1.3.5 Ports
3 RS232 serial ports (DB9 and 2 LEMO 5pin).
1 RJ45 Ethernet port.
1 power port.
1 USB port.
1 4G LTE antenna port.
1 UHF antenna port.(Optional)
1 EVENT port.
1 1PPS port.
1 SIM card slot.
1 GNSS antenna port.
1.3.6 Data and Storage
 Output data format: NMEA-0183, binary, RINEX,RTCM2.x, RTCM3.x
 Internal memory: 32G
 External storage: TF Card

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2 Hardware Structure
2.1 Receiver Appearance
Figure 2-1
2.1.1 Front Panel
The front panel of NET20 Plus receiver includes four buttons, four LED indicators, and one
OLED display.
Figure 2-2
After switching on NET20 Plus receiver, current time information and GPS status are
displayed in the main interface. The default language is English, and you can press the
left and right arrow keys to obtain the current IP information.
Table 2-1 Function table
Name
Function
Direction
buttons
 To move the cursor up or left, short press the button.
 To return to the previous menu, long press the button.
To move the cursor down or right, short press the button.
Function
button
 To enter the main menu, long press the button.
 To define the direction button ( or ), short press the button.
Power
button
 To turn on/off NET20 Plus, long press the button.
 To confirm your selection, short press the button.
P ower indi cator
After switching on NET20 Plus receiver, the power light is on
Dif ferentia l
tran smission indi cator
Whe n the diffe rentia l data output, the diffe rentia l indi cator bli n ks
evenl y at 1 - sec ond in terval
Blu etooth indi cator
It will be light blue when NET20 Plus is connected via Bluetooth
S tat ic record in g
indi cator
Whe n st art st at ic record in g, st at ic record in g indi cator blinks evenly
at 1 - sec ond in terval

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2.1.2 Back panel
NET20 Plus receiver provides a variety of communication interfaces to facilitate users in
different application scenarios.
Figure 2-3 Back panel Table 2-2 Interface function table
No.
Name
Function
1
PWR
Receiver power supply interface, input voltage DC 9V-28V.
2
USB
USB interface
3
COM1
RS232 serial port
4
COM2
RS232 serial port (Optional RS485 serial port)
5
COM3
DB9 serial port
6
LTE
GPRS antenna interface
7
1PPS
1 Pulse Per Second output
8
EVENT
EVENT input
9
TF & SIM
TF interface & SIM card (standard size) interface
10
RJ45
Wired Ethernet port
11
GNSS
GNSS External receiver antenna connector
12
OSC
Access to external clock

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2.2 Structural drawings / mounting dimensions
(Dimensions in mm)
Figure 2-4

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3 WEB UI
There are two ways to login into the WEB interface, which are Ethernet port login and WIFI
login. The WEB interface content of the two login modes is same.
1. Ethernet port login: Connect the RJ45 network port with the computer host and enter
the IP address in the browser. Enter user name and password in the pop-up dialog box;
the default username is admin and the default password is password.
2. WIFI login: when NET20 Plus WIFI hotspot is enable, the user can log in into the WEB
interface by connecting to its WIFI network. The hotspot name is the serial number of
the receiver. Enter the IP address: 192.168.10.1, a window will pop up, the default
username is admin and the default password is password.
3.1 Summary
After a successful authentication to the WEB interface of NET20 Plus, the main page
contents: Reference information, device version, system version, network parameters,
memory status and so on. It is shown asbelow:
Figure 3-1
Note: The effect of different browsers display may be slightly different, recommend using
Google Chrome or IE.

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3.2 System Information
3.2.1 System Information
The system information screen will display the station name, device model, device serial
number, system version, application version information, built-in OEM board model and
network parameterinformation.
Figure 3-2

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3.2.2 GPS Status
The GPS Status page displays the current NET20 Plus positioning, the base station
coordinates and antenna type.
Figure 3-3
3.2.3 Satellites
This page shows the current satellite signal-to-noise ratio, elevation mask angle, azimuth
and other information. The information of GPS, BEIDOU, GLONASS and GALILEO are
displayedseparately.
Figure 3-4

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3.2.4 Data Transmission
After setting up the data transmission, the user can see the current data transfer status
on the page as shown in figure 3-5. Click [Edit] to directly jump to [Ntrip Server].
Figure 3-5
3.2.5 Data Recording
In this page, the user can see the specific data recording information as shown in figure 3-6.
Click [Edit], the user could modify the parameters like path type, file name, interval, duration
time, etc. as shown in figure3-7.
Figure 3-6

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Figure 3-7
3.3 Configuration
3.3.1 Reference Station
On this page the user mainly can set the reference station, antenna, coordinate system and
station coordinates, as shown in figure3-8.
Figure 3-8
Reference station coordinates: If you do not need known coordinates to start the
reference station, then click on "Load Current Position" to get the reference station
coordinates approximately. However, if you need known coordinates, please input them
according to the appropriateformat.
The web access port is 80. After setting mapping in the router device, then you can access
the NET20 Plus by Internet, enter the ip address and the port, e.g.113.109.179.180:80

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3.3.2 GNSS configuration
This menu is mainly for the satellite systems and the cutoff angle settings, as shown in
figure 3-10.
Figure 3-10
3.3.3 Tracking satellites
In this page, the user can select the satellites they want to track, as shown in figure 3-11.
Figure 3-11

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3.3.4 Network
From Network option, the user can set the device network and FTP server settings as shown
in figure 3-12.
Figure 3-12
DHCP: If the mode DHCP is enable, the NET20 Plus receiver will auto get an IP address,
otherwise it uses the static IP.
WIFI hotspot: If WIFI hotspot option is enable, then you can use other devices equipped
with WIFI to search and connect to the NET20 Plus receiver. The hotspot is named by the
serial number of the receiver. You don’t need to input a password. Access NET20 Plus by
IP address 192.168.10.1. The hotspot only play the role of control and can’t access to
internet.
WIFI Client: When selecting WIFI client, in SSID box input a name of WIFI hotspot can
be used for the search, and in the Password box input the password for connecting to
WIFI hotspot, then submit. After connecting to the connection WIFI, the password can be
seen in system terminal or panel interface (the displayed place will be different in different
versions).
Mobile network: enable Mobile Net to use the SIM card into the NET20 Plus, it supports
4G network. Users can set the user name and password if required.
FTP download: You can set the parameters of the FTP server. If anonymous access is
turned on, it does not require a user name and password to connect to the NET20 Plus. If
anonymous access is turned off, enter the user name and password.

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After using the FTP tool to connect to the NET20 Plus, the data appears as follows:
Figure 3-13
3.3.5 Ntrip Server
In this page, the user can set the NTRIP connection parameters of the reference station:
Figure 3-14
Remarks:
a. The password in this page must match the password of the server NTRIP if itis required.
If the password is not required by the server you can enter any value.
b. When the [Auto Connect] option is chosen, after the network is disconnected, the data
transmission will be automatically connected. If the option is disable will be necessary