ACNOVO GX900 User manual

ACNOVO

ACNOVO
Contents
1 Introduction...............................................................................................................4
1.1 Company Introduction......................................................................................4
1.2 Outstanding Features of ACNOVO GX900 .....................................................4
2 General Information.................................................................................................6
2.1 Outlook of GX900 ............................................................................................6
2.2 Basic Operation.................................................................................................7
2.2.1 Turn on/off..............................................................................................7
2.2.2 Self check................................................................................................7
3 Equipment List..........................................................................................................8
3.1 Packing List of Base .........................................................................................8
3.2 Packing List of Rover .......................................................................................9
4 Setting Up ................................................................................................................10
4.1 Setting Up Base Station ..................................................................................10
4.1.1 Choose a suitable place.........................................................................10
4.1.2 Set up instrument ..................................................................................10
4.1.3 Measure antenna height ........................................................................12
4.1.4 Transmit signal through external radio.................................................12
4.1.5 Transmit signal through internal radio..................................................13
4.1.6 Transmit signal through network..........................................................13
4.2 Setting Up Rover Station ................................................................................13
4.2.1 Connect controller with rover...............................................................13
4.2.2 Rover internal radio ..............................................................................13
4.2.3 Rover network mode.............................................................................13
4.2.4 Rover controller network......................................................................13
4.2.5 Download backup data..........................................................................14
4.3 Static Surveying..............................................................................................14
4.3.1 Baseline network design.......................................................................14
4.3.2 Outdoor surveying ................................................................................15
4.3.3 Download data......................................................................................16
5 WEB UI Control......................................................................................................16
5.1 Connect and register WEB UI ........................................................................16
5.2 Status...............................................................................................................17
5.2.1 Position .................................................................................................17
5.2.2 Datalink.................................................................................................18
5.2.3 Satellites................................................................................................19
5.2.4 Information ...........................................................................................19
5.3 Settings............................................................................................................20
5.3.1 Working mode.......................................................................................20

ACNOVO
5.3.2 Satellites setting....................................................................................24
5.3.3 Device configuration.............................................................................24
5.3.4 NMEA message ....................................................................................25
5.3.5 View logs and configuration set............................................................25
5.4 Download data................................................................................................26
5.4.1 Raw data................................................................................................26
5.4.2 Backup data...........................................................................................26
5.5 Management....................................................................................................27
6 Frequently Use Functions.......................................................................................27
6.1 Device registration..........................................................................................27
6.2 Download static data and Rinex change.........................................................29
6.3 Upgrade firmware...........................................................................................29
6.4 Restore factory settings...................................................................................30

1 Introduction
1.1 Company Introduction
ACNOVO is professional in surveying and mapping industry. Advanced and
high-quality products are our top priority. We try our best to offer prompt and good
service to all our customers. Rich experience and abundant knowledge in this field
guarantee that every decision we made is on the basis of scientific test. We strive to
provide great products and service with reasonable price and believe it’s the key to
have more clients and gain more cooperation.
1.2 Outstanding Features of ACNOVO GX900
Purchasing the right tools for a professional job is essential in today’s competitive
business environment. As the latest GNSS receiver, ACNOVO GX900 distinguishes
itself from other GNSS products. It is more compact and lightweight but integrating
more advanced technology. Even still equipped with magnesium alloy fuselage, the
dimension is only 140x157x76mm and the weight is just 1KG. Many revolutionary
technologies in GX900 makes your survey work more quickly and efficiently. Some
innovation features can be summarized as below:
(1) Board and L-Band
GX900 is compatible with 3 kinds of GNSS board including Trimble BD990,
NOVATEL 729, Hemisphere P328, makes it capable to track GPS, GLONASS,
GALILEO, BEIDOU and can maximize the tracking to observe all visible GNSS
satellites signal, thereby providing maximum performance of accuracy and real-time
measurements. GX900 also supports L-Band function, can get centimeter accuracy
just with one receiver. L-Band is not standard configuration, need to pay for
activation.
(2) Multi-Connectivity
GX900 provides two connecting methods for receiver and controller---Bluetooth
connection and Wi-Fi connection. Data transmission proves to be more stable with
these new connection ways. Besides, GX900 supports “fast connection”, put your
controller close to the receiver, click “fast connection” and it will search and connect
the receiver automatically via Bluetooth when power on.
(3) WEB UI control
The second generation WEB UI control is fully compatible with all devices and all
browsers. It’s more convenient with WEB UI control.
(4) 4G Network
GX900 has advanced 4G module, guarantee 4G network can transmit world-widely. It
enables more convenient and stable network communication.

(5) Tilt Survey
Inserted with high-sensitive E-bubble and brand-new tilt survey algorithm. GX900 is
calibration-free. Immune to magnetic disturbance and free from limitation of tilt
angles. GX900 can measure points where a vertical placement of the pole is not
possible such as house corner.
(6) Dual Batteries
Inserted with 2 smart hot swappable Lithium batteries, GX900 can work maximum of
10hours without stopping. Battery level can be viewed at the press of one button on
battery. The battery is also same as controller.
(7) Alarm System
In UHF model, when base is moved,with low power or no satellites, Rover will alarm
immediately.
All of these innovations will increase your productivity and taking your performance
to a new level.

2 General Information
2.1 Outlook of GX900
Figure 2-1
The indicator status: dark, light or blink... It represents different status of the RTK
equipment:
Power Button
Turn on/off the device. Light when device is turned on. Turn to
red when with low power
Satellites Indicator
Blink when normally receive satellites signals. The times it
blinks, the number of satellite it tracks. Light without blinking
indicates GX900 gets fixed solution
Datalink Indicator
Blink regularly with green color means correction data is
transmitting or receiving normally; blink regularly with blue
color means static data is recording
Wi-Fi Indicator
Light when device used as hotspot or being connected as client
Bluetooth Indicator
Light when device has been connected via Bluetooth

2.2 Basic Operation
2.2.1 Turn on/off
Turn on.
Keep pressing power button for 4seconds, then you will see the power button light up
and beep.
Turn off.
With voice guide: Keep pressing power button for 4seconds, then you will hear voice
guide “power off”, release and one press on the button again will turn the device off.
Without voice guide: Keep pressing power button for 4seconds, release and you can
see all 5 indicators blink simultaneously, one press on the power button again will
turn the device off.
2.2.2 Self check
GX900 has self-checking function when you find some malfunctions like the
indicators are abnormal or receiver can’t work normally or the device cannot connect
via Bluetooth or Wi-Fi, radio mode is not workable or can’t connect to CORS.
Self-checking function covers radio mode check, GSM mode check, Bluetooth mode
check and Wi-Fi mode check. There is voice guide to tell you whether it is OK or not.
When the receiver is turned on, keep pressing the power button for 4seconds, then
you hear “power off”, release and keep pressing the power button again for 4seconds.
You hear “self-check” and then following checking process and the results of each
check.

3 Equipment List
3.1 Packing List of Base
ACNOVO GX900 BASE SET
1. Main body
Name
Type
Description
Picture
Weight
QTY
Receiver
GX900
Mainboard:
1.2KG
(with two
batteries)
1
2. Accessories
Name
Type
Description
Picture
QTY
Lithium Battery
BP-5S
7.2V
3400mAH
2
Charger
CH-04
Battery charger
1
Charger Adapter
DSA-40C
A-12
Power Adapter
for Charger
1
UHFAntenna
QT440A
UHF antenna
1
Connector
RTK
Connect with
Tribrach
1
Tape
MTSP4
3m tape
1
Supporting Pole
25cm FRP
supporting pole
1
Pallet
1
Base Case
YPCC1
Yellow, rigid
plastic carrying
case
1

3.2 Packing List of Rover
ACNOVO GX900 ROVER SET
1. Main body
Name
Type
Description
Picture
Weight
QTY
Receiver
main body
GX900
Mainboard:
1.2KG
(with two
batteries)
1
2. Accessories
Name
Type
Description
Picture
QTY
Lithium
Battery
BP-5S
7.2V
3400mAH
2
Charger
CH-04
Battery
charger
1
Charger
Adapter
DSA-40C
A-12
Power Adapter
for Charger
1
UHF
Antenna
QT440A
UHF antenna
1
Connector
RTK
Connect with
Tribrach
1
Tape
MTSP4
3m tape
1
Bracket
ITM-
AT104
Bracket, with
compass
1
Carrying
Case
YPCC2
Yellow, rigid
plastic
carrying case
1
Carbon
Fiber
Pole
ITM-AP10
(Optional)
No Logo
1

4 Setting Up
4.1 Setting Up Base Station
4.1.1 Choose a suitable place
A suitable place is essential for base station to better receive the satellites and transmit
the UHF signals. A suitable position should comply with following conditions:
(1) Choose a wide open area in order to easy and better receive signal of satellites.
Besides, make sure there is no covering like roof or heavy foliage.
(2) A higher place is better for transmitting the UHF signals. If rover is far away from
base, then the enhanced antenna should be raised by tripod.
(3) Make sure there is no large area of water or objects intensely interfering the
satellite signal.
(4) Check carefully that there are no high-power radio emission objects surrounded.
And make sure there is no power lines around. Need keep at least 200m far from these
objects.
4.1.2 Set up instrument
Mount the instrument to the tripod. Level and center the instrument precisely to
ensure the best performance. You can set up base on random point or on given point.
If you set base on random point, you just choose a position and level the instrument. If
you set base on given point, you can follow below steps:
(1) Leveling and Centering the instrument
a. Setting up tripod
First, extend the extension legs to suitable length, make the tripod head parallel to the
ground and tighten the screws.
b. Make the center of the tripod and the occupied point approximately on the same
plumb line
c. Step on the tripod to make sure if it is well stationed on the ground.
(2) Attaching the instrument on the tripod
Place the instrument carefully on the tripod head and slid the instrument by loosening
the tripod screw.
(3) Roughly leveling the instrument by using the circular vial
a. Turn the leveling screw A and B to move the bubble in the circular vial as below
Figure 4-1 shown, in which case the bubble is located on a line perpendicular to a line
running through the centers of the two leveling screw being adjusted.

Figure 4-1
b. Turn the leveling screw C to move the bubble to the center of the circular vial.
Figure 4-2
(4) Precisely leveling by using the plate vial
a. Rotate the instrument horizontally by loosening the horizontal clamp screw and
place the plate vial parallel to the line connecting leveling screw A and B, and then
bring the bubble to the center of the plate vial by turning the leveling screws A and B.
Figure 4-3
b. Rotate the instrument 900 around its vertical axis and turn the remaining leveling
screw or leveling C to center the bubble once more.
Figure 4-4
c. Repeat the above a&b steps for each 900rotation of the instrument and check
whether the bubble is correctly centered in all directions.

4.1.3 Measure antenna height
The antenna height must be measured when we use GX900 to collect static data or
use it as base station. It’s the “a” show in below Figure 4-5, the height from ground
measured point to phase center, only get this height can we know coordinate of the
ground measured point. There are 3 measuring methods to get the antenna height:
(1) Slant height
Measure the distance from the ground measured point to the middle of mainframe
scale mark. It’s the “d” shown in Figure 4-5.
(2) Pole height
Measure the distance from bottom of device to ground directly. It’s the vertical height
“b” shown in Figure 4-5.
(3) Measuring plate
Measure the distance ground measured point to the upper edge of plate. It’s the “c”
shown in Figure 4-5.
Choose either one measuring method from above. Use measure tape measure the
height you choose. Input the height in software. Then you can get the height from
ground to phase center. The formula is as below:
a=b+L1
b=
22 kc 
b=
22 Rd 
－H
Figure 4-5 (Measure Antenna Height)
4.1.4 Transmit signal through external radio
Fix external enhanced antenna onto the tripod, and use connection cable to connect
external radio with 5-pin port of receiver as shown in Figure 4-6. Plug power cable to
external radio. Then turn on radio. You can set the channel on the external radio

directly. The external serial port baud rate should be same as external radio. The baud
rate for our device is 38400. If you use our radio, you have to set the baud rate to be
38400 for your receiver to match the radio.
4.1.5 Transmit signal through internal radio
For short distance, you can use internal radio to transmit the signal. First, fix the UHF
antenna on GX900 as shown in Figure 4-7. And then select internal radio mode via
controller or WEB UI function. Internal radio covers distance around 5km.
4.1.6 Transmit signal through network
You can also use network (GX900 has 4G module supports 4G network) to transmit
signal. Insert SIM card into the receiver. And select network datalink via controller or
WEB UI function.
4.2 Setting Up Rover Station
Rover station can receive data through different datalink methods--internal radio,
rover network and controller network.
4.2.1 Connect controller with rover
Attached the controller bracket to the pole. If use internal 4G, you need to insert the
SIM card in controller. If use internal radio, then fix UHF antenna. You can connect
the controller with rover through Wi-Fi or Bluetooth as you prefer.
(1) Via Wi-Fi
GX900 can be used as a hotspot, use controller to search the Wi-Fi signal of GX900,
the Serial NO. of GX900 will show on controller, then select it to finish connect.
(2) Via Bluetooth
Use controller to search the Bluetooth signal of GX900, once found, the Serial NO. of
GX900 will show on controller, then select it to finish connect.
4.2.2 Rover internal radio
Fix UHF antenna on rover, then select internal radio mode on controller or via WEB
UI function. You can select radio channel and radio protocol, but make sure the
channel and radio protocol are same as base. On controller, Channel 8 is able to edit.
While channel 1~7 cannot be edited.
4.2.3 Rover network mode
Insert SIM card on rover, then select network mode on controller or via WEB UI
function. Input the CORS account and password, set APN and upload GGA.
4.2.4 Rover controller network
This method means the SIM card is inserted in controller. The controller gets the
correction data and send to device via Bluetooth. It’s less stable compare with device
network.

4.2.5 Download backup data
Once finish surveying, you can download the backup data via WEB UI as shown in
Figure 4-8. The backup data format is “RTK”
Figure 4-8
4.3 Static Surveying
Static surveying requests at least 2 receivers put on 2 points on a baseline. Keep these
receivers in the same position and track at least 4 satellites then get relative distance
of these 2 points. Static surveying provides the highest accuracy achievable and
requires the longest observation times, from less than an hour to five hours or longer.
The static surveying function in GX900 including outdoor surveying and indoor data
post processing.
4.3.1 Baseline network design
(1) Synchronous pattern
As we know, static surveying uses at least two or more than two receivers track same
satellites during same period. And then we can get data of these points. The pattern
that formed by these points called synchronizing pattern. If use three or more than
three receivers, the pattern formed by these points called synchronizing pattern cycle.
As show in Figure 4-9.

Figure 4-9(synchronous pattern)
(2) Asynchronous pattern
If there are too many points in one baseline network, you should connect these
synchronous cycle together and form the asynchronous pattern.
Asynchronous pattern can be connected via three ways as shown in Figure 4-10:
(a) point connecting. Point connecting network is defined as a figure by connecting
two adjacent shapes by only one common point. The advantage of this type is high
efficient ACNOVO, fast extending. But it cannot confirm the high precision
surveying. Therefore, it is not recommended in precise working.
(b) side connecting. Side connecting network is defined as a figure by connecting two
adjacent shapes by their same side. It is widely used in the surveying field due to its
high precision.
(c) point and side connecting. Because every type of network has its own advantage
and disadvantage, we can combine these types to achieve higher efficient ACNOVO
but lower investment in time. Mixed connecting network is common in surveying
work.
Figure 4-10(asynchronous pattern)
4.3.2 Outdoor surveying
(1) Choose suitable points
Suitable points are essential to make sure whole surveying work goes smoothly and
efficiently. The points should be fixed only after you well analyze and collect full
information of the surveying area. Choose these points best suits your accuracy and
surveying purpose. When choose the point in static surveying, you should pay
attention to below:
a. The points should comply with your surveying purpose.
b. The points should also be easy-to-use for other surveying methods.
c. Convenient transportation. So it’s easy for you to set up device.
d. Away from high power radio emission objects, make sure no magnetic field
influence nearby.
e. Away from large water area or mirror building, reduce the multi-path interface.
f. Good ground foundation, so the point can be saved enduringly.

g. Make marks after choose the points, including its position info and sketch for
surroundings.
(2) Setting up devices
After choose the points, you set up the device on these points. Power on the device,
then you can set “Static Mode” via controller software or WEB UI. As shown in
below Figure 4-11.
Figure 4-11
You can define the point name and set interval frequency and input the antenna height
and others. Once working, you can observe the satellite signal status and record the
satellite data in device or in controller.
4.3.3 Download data
Connect GX900 via WEB UI) for data downloading. File name given should comply
with the notes of outdoor surveying made by yourself. Data file name includes points
name, day of year and surveying times. It is easy for you to distinguish. If the file
name is 34661171.F14, the first four numbers “3466” can be defined by yourself. The
later three numbers “117” represent the day of year, which cannot be edited. Last
number means the surveying times, which cannot be edited either. Convert the data to
RINEX format.
5 WEB UI Control
5.1 Connect and register WEB UI
GX900 can work as Wi-Fi Hotspot. You can connect it with phone, controller, PC or
other devices through its Wi-Fi. The default Wi-Fi name is device number, no
password needed.

After connecting the Wi-Fi, input IP”192.168.10.1” into your web browser to turn it
on.
It will pop up a window like Figure 5-1, requests User name and password, default is
as follow: User name: admin Password: password
Figure 5-1
The WEB UI includes Status, Position, Settings, Download and Management.
5.2 Status
In status, you can see current work status of receiver and some basic information.
Such as datalink, satellites and the device information.
5.2.1 Position
In “Position” you can see the system mode, coordinate and satellites.

Figure 5-2
5.2.2 Data link
In “Data link” you can set the channel, frequency and protocol. And you can also do
channel detection in this menu. Below pic shows internal radio data link.
Figure 5-3

5.2.3 Satellites
In “Satellites” you can set the cutoff angle and can see satellites conditions.
Figure 5-4
5.2.4 Information
In “Information”, you are able to check information details about this receiver, such as
firmware version of the receiver, GPS firmware version, UHF mode information,
Network information etc.
Figure 5-5

5.3 Settings
5.3.1 Working mode
In “Working Mode”, you can select different work mode: static, rover and base. In
different mode, you can define different configuration.
(1) Static Mode
As the pic shows, you can input the point name, antenna height, PDOP threshold.
Select antenna measurement method and interval. Last is the auto record, if you
choose “YES”, the data will be collect automatically when the receiver is working.
Figure 5-6
(2) Rover Mode
In rover mode, you can select different data link. There is different configuration in
each data link method. The data link methods are UHF, Network, External and
Bluetooth.
If you choose UHF datalink, you can choose record raw data or not. Select the radio
channel and radio protocol as you prefer. GX900 is compatible with various protocols,
such as: SATEL, PCC-GMSK, TrimTalk 450S, South 9600, TrimMark III(19200),
South 19200, Hi-target 9600, Hi-target 19200.