丨 Product Introduction
1. Built in advanced full system full constellation GNSS module.
2. Supports BDS, GPS, GLONASS, Galileo, and QZSS.
3. Can be used as a base station or mobile station.
4. Adopt on-board standard 9-36V wide voltage input.
5. Adopt industrial grade 2W wireless transmitter module.
丨 Specification parameters
|
Specification parameters
|
|
GNSS module
|
1
|
working frequency
|
BDS: B1I B2I B3I B1C B2a B2b
GPS: L1 C/A L1C L2P (Y) L2C L5
GLONASS: L1 L2
Galileo: E1 E5a E5b E6
QZSS: L1 L2 L5 L6
|
|
2
|
Receiving channel
|
1408 channel
|
|
3
|
Single point positioning
(RMS)
|
Plane: 1.5m
|
|
Elevation: 2.5m
|
|
4
|
DGPS(RMS)
|
Plane: 0.4m+1ppm
|
|
Elevation: 0.8m+1ppm
|
|
5
|
RTK(RMS)
|
Flat: 0.008m+1ppm
|
|
Elevation: 0.015m+1ppm
|
|
6
|
Observation accuracy (RMS)
|
BDS
|
GPS
|
GLONASS
|
Galileo
|
|
7
|
B1I/B1C/L1C/L1 C/A/E1/G1 pseudorange
|
10cm
|
10cm
|
10cm
|
10cm
|
|
8
|
B1I/B1C/L1C/L1 C/A/E1/G1 carrier phase
|
1mm
|
1mm
|
1mm
|
1mm
|
|
9
|
B3I/L2P (Y)/L2C/G2 pseudorange
|
10cm
|
10cm
|
10cm
|
10cm
|
|
10
|
B3I/L2P(Y)/L2C/G2
|
1mm
|
1mm
|
1mm
|
1mm
|
|
11
|
carrier phase
|
10cm
|
10cm
|
10cm
|
10cm
|
|
12
|
B2I/B2a/B2b/L5/E5a/E5b pseudorange
|
1mm
|
1mm
|
1mm
|
1mm
|
|
13
|
Time accuracy (RMS)
|
10ns
|
|
14
|
Speed accuracy (RMS)
|
0.03m/s
|
|
15
|
cold boot
|
＜10s
|
|
16
|
Initialization time
|
<5s (typical value)
|
|
17
|
Initialize reliability
|
＞ 99.9%
|
|
Radio module
|
1
|
frequency range
|
410-470MHz
|
|
2
|
Channel spacing
|
12.5KHz
|
|
3
|
Working mode
|
half-duplex
|
|
4
|
Frequency stability
|
1.5ppm
|
|
5
|
modulation mode
|
CSS
|
|
6
|
Airborne baud rate
|
12Kbps
|
|
7
|
Protocol type
|
LoRa
|
|
8
|
Serial port baud rate
|
4800/9600/19200/38400/115200bps
|
|
9
|
Maximum data transmission and reception size per second
|
1000Byte
|
|
10
|
Receive current
|
50mA
|
|
11
|
Emission current
|
＜2A
|
|
12
|
Transmission power
|
33dBm±1.5dB
|
|
Interface
|
1
|
Radio interface
|
SMA ports
|
|
2
|
GNSS antenna interface
|
SMA ports
|
|
3
|
Data/power interface
|
8-core LEMO ports
|
|
Data format
|
1
|
Differential data
|
RTCM3.X
|
|
2
|
output format
|
NMEA-0183, RTCM3.X
|
|
3
|
Data update rate
|
1Hz-20Hz(default 1Hz)
|
|
power supply
|
1
|
Voltage
|
DC +9V～36V
|
|
2
|
power waste
|
＜3W
|
|
3
|
indicator light
|
1power，1PPS，1RTK
|
|
Physical
parameters
|
1
|
size
|
100mm*61.8mm*18.75mm
|
|
2
|
weight
|
180g
|
|
3
|
Shell material
|
aluminium
|
|
Environmental
Specifications
|
1
|
working temperature
|
-30℃ ～ +70℃
|
|
2
|
Storage temperature
|
-55℃ ～+85℃
|
|
3
|
humidity
|
95%condensation
|
|
4
|
Protection grade
|
IP66
|
|
5
|
Seismic resistance
|
Resist the impact of a 1-meter free fall
|
Table 1 M8 Interface Definition
|
M8-8P Male Interface Description
|
|
No.
|
Interface Name
|
Function Description
|
|
1
|
VCC
|
Input voltage 9-36V (typical value 12V), current 3A
|
|
2
|
RADIO-D-
|
Radio serial port USB D-
|
|
3
|
RADIO-D+
|
Radio serial port USB D+
|
|
4
|
RS232-RXD
|
GNSS module RS232 RXD
|
|
5
|
RS232-TXD
|
GNSS module RS232 TXD
|
|
6
|
CAN-
|
NC
|
|
7
|
CAN+
|
NC
|
|
8
|
GND
|
Mainboard GND
|
|
LED Indicator Interaction
|
|
1
|
PWR
|
Power indicator, solid red when operating normally
|
|
2
|
RTK
|
Differential positioning indicator, solid blue in FIX state
|
|
3
|
PPS
|
Positioning indicator, green light flashes, provides an output pulse per second (1PPS) signal with adjustable pulse width and polarity
|
|
Antenna Interface Definition
|
|
1
|
GNSS Antenna
|
SMA female, primarily receives GNSS antenna signals, antenna power supply 5V
|
|
2
|
Radio Antenna
|
SMA male, primarily receives/transmits 410-470MHz antenna signals
|
Structural diagram of connecting cables：
Complete scheme display：
Table 2 Complete Component Description
|
No.
|
Product Name
|
Function Description
|
|
1
|
Connection Cable
|
8-pin aviation connector to Type-C; DC-DC power
DB9 female connector
|
|
2
|
Receiver
|
Built-in GNSS module and Radio module
|
|
3
|
Radio Antenna
|
433±20MHz antenna
|
|
4
|
GNSS Antenna
|
All-system, all-frequency antenna
|
|
5
|
Coaxial Cable
|
5m TNC to SMA, 50-3 cable
|
antenna parameters：
  |
|
Electrical
Characteristics
|
1
|
Frequency Range
|
GPS: L1, L2, L5
BDS: B1I, B2I, B3I, B2a, B2b
GLONASS: L1, L2, L3
Galileo: E1, E5b, E5a, E6
QZSS: L1, L2, L5, L6
IRNSS: L5
L-BAND
|
|
2
|
Output Standing Wave
|
≤2.0
|
|
3
|
Antenna Axial Ratio
|
≤3dB
|
|
4
|
Maximum Gain
|
5.5dBi
|
|
5
|
Phase Center
|
±2mm
|
|
6
|
Impedance
|
50Ω
|
|
7
|
Polarization Mode
|
RHCP
|
|
LNA
Specifications
|
1
|
LNA
|
L1:38±2dB
L2:38±2dB
|
|
2
|
VSWR
|
≤2.0
|
|
3
|
Noise Figure
|
≤1.8dB
|
|
4
|
In-band Flatness
|
1dB
|
|
5
|
Operating Voltage
|
3.3～12V
|
|
6
|
Operating Current
|
≤45 mA
|
|
7
|
Differential Transmission Delay
|
≤5ns
|
|
Structural Characteristics
|
1
|
Antenna Size
|
Φ159*61mm
|
|
2
|
Weight
|
≤380g
|
|
3
|
Connector Type
|
TNC
|
|
4
|
Thread Specification
|
Unified National Coarse (UNC) 5/8''×11 (Imperial)
|
|
5
|
Mounting Method
|
centering rod mounting
|
|
Environmental Conditions
|
1
|
Operating Temperature
|
-40℃～+85℃
|
|
2
|
Storage Temperature
|
-55℃～+85℃
|
|
3
|
Humidity
|
95% non-condensing
|
  |
|
Antenna
Characteristics
|
1
|
Operating Frequency
|
GPS: L1C/A, L1C, L2P, L2C, L5
BDS-2: B1I, B21, B31
BDS-3: B1I, B31, B1C, B2a, B2b
GLONASS: G1, G2, G3
Galileo: E1, E5b, E5a, E5AltBoC, E6c
QZSS: L1C/A, L2C, L5, L1C
SBAS: L1C/A
IRNSS: L5
|
|
2
|
Antenna Specifications
|
GPS, Bei Dou，GLONASS,GALILEO
|
|
3
|
Frequency Range
|
1165-1278/1559-1612MHz
|
|
4
|
V.S.W. R
|
≤2.0
|
|
5
|
Axial Ratio
|
Elevation angle 90 degrees: ≤3
Elevation angle 15 degrees: ≤5
|
|
6
|
Gain
|
Elevation angle 90 degrees: ≥6
Elevation angle 20 degrees: ≥0 (plane)
|
|
7
|
Front to back power
|
±60 degrees: ≥15dB
|
|
8
|
Phase Center (mm)
|
<2
|
|
9
|
Impendence
|
50Ω
|
|
10
|
Polarization
|
RHCP
|
|
LNA
|
1
|
LNA GAIN
|
38±2dB
|
|
2
|
V.S.W. R
|
＜2
|
|
3
|
Noise Figure
|
＜1.5
|
|
4
|
DC Voltage
|
3.3~18V
|
|
5
|
Current
|
＜35 mA
|
|
Mechanical
Structure
|
1
|
Component Name
|
SPEC
|
|
2
|
Antenna Connector
|
TNC / SMA
|
|
3
|
Antenna Dimensions
|
Φ120*38mm
|
|
4
|
weight
|
313.8g
|
|
5
|
PCB board
|
FR4
|
|
Environmental Characteristics
|
1
|
Operating Temperature
|
-40℃~+85℃, 10%~95% RH
|
|
2
|
Storage Temperature
|
-55℃~+100℃, 10%~95% RH
|
|
3
|
Vibration
|
Sine sweep @1.5mmAM
10~55Hz each Axis
|
|
picture
|
1
|
picture
|
|
|
|
Electrical
Characteristics
|
1
|
Operating Frequency
|
GPS: L1, L2, L5
BDS: B1I, B2I, B3I, B2a, B2b
GLONASS: L1, L2, L3
Galileo: E1, E5b, E5a, E6
QZSS: L1, L2, L5, L6
IRNSS: L5
|
GPS: L1, L2, L5
BDS: B1I, B2I, B3I, B2a, B2b
GLONASS: L1, L2, L3
Galileo: E1, E5b, E5a, E6
QZSS: L1, L2, L5, L6
IRNSS: L5
|
|
2
|
Frequency Range
|
1170-1278/1559-1612MHz
|
1170-1278/1559-1612MHz
|
|
3
|
V.S.W. R
|
≤2.0
|
≤2.0
|
|
4
|
Axial Ratio
|
Elevation at 90 degrees: ≤ 3,
Elevation at 15 degrees: ≤ 5
|
At elevation angle 90 degrees:
≤3, at elevation angle 15 degrees: ≤5
|
|
5
|
Gain
|
Elevation at 90 degrees: ≥ 6 dB,
Elevation at 20 degrees: ≥ 0 dB
|
At an elevation angle of 90 degrees:
≥6, at an elevation angle of 20 degrees: ≥0 plane
|
|
6
|
Phase Center
|
<2mm
|
<2
|
|
7
|
Impendence
|
50Ω
|
50Ω
|
|
8
|
Polarization
|
RHCP
|
RHCP
|
|
9
|
Out-of-Band Suppression
|
1268+100MHZ≥50db,
1170-100MHZ≥50db，
1602+100MHZ≥50db,
1561-100MHZ ≥50db.
|
1268+100MHZ≥50db,
1170-100MHZ≥50db，
1602+100MHZ≥50db,
1561-100MHZ ≥50db.
|
|
LNA
|
1
|
LNA GAIN
|
38±2dB
|
38±2dB
|
|
2
|
V.S.W. R
|
＜2
|
＜2
|
|
3
|
Noise Figure
|
＜2.0
|
＜2.0
|
|
4
|
DC Voltage
|
3.3~16V
|
3.3~16V
|
|
5
|
Current
|
＜35 mA
|
＜35 mA
|
|
Mechanical
Structure
|
1
|
Part Name
|
SPEC
|
SPEC
|
|
2
|
Antenna
|
FPC
|
FPC
|
|
3
|
Antenna Dimensions
|
Φ45.6*40mm
|
Φ62.1*25mm
|
|
4
|
Product Weight
|
25.8g
|
25.4g
|
|
5
|
Coaxial line
|
RG316 / RG1.13(customizable)
|
RG316 / RG1.13(customizable)
|
|
6
|
Line length
|
L=150mm / L=250mm(customizable)
|
L=150mm / L=250mm(customizable)
|
|
7
|
RF Output Interface
|
SMA-J / IPEX / MCX / MMCX(customizable)
|
SMA-J / IPEX / MCX / MMCX(customizable)
|
|
8
|
Antenna Housing
|
ABS+PC
|
ABS+PC
|
|
9
|
PCB Board
|
FR4
|
FR4
|
|
Environmental
Characteristics
|
1
|
Operating Temperature
|
-40℃~+85℃, 10%~95% RH
|
-40℃~+85℃, 10%~95% RH
|
|
2
|
Storage Temperature
|
-40℃~+85℃, 10%~95% RH
|
-40℃~+85℃, 10%~95% RH
|
|
3
|
Humidity
|
Sine sweep
@1.5mmAM 10~55Hz each Axis
|
Sine sweep
@1.5mmAM 10~55Hz each Axis
|
|
4
|
Vibration Resistance
|
95％ No-condensing
|
95％ No-condensing
|
AK181：
AK161：
Packaging and Delivery：
High-Precision GNSS Receiver for Surveying and UAV Applications
The DALANG AK977K is a high-performance GNSS receiver with a built-in multi-system, multi-frequency GNSS module that supports BeiDou, GPS, GLONASS, Galileo, QZSS, and SBAS signal tracking. Delivering excellent multi-frequency, multi-constellation tracking capabilities, it maintains high-precision positioning even in complex environments. Ideal for surveying, precision agriculture, UAVs, and autonomous robots, it is the perfect choice for professional high-precision applications.
Real-Time High-Precision Positioning Engine
Utilizing advanced GNSS technology and supporting RTK centimeter-level positioning, it achieves horizontal accuracy of 8mm+1ppm and elevation accuracy of 15mm+1ppm. With a cold start time of <10 seconds, initialization time of <5 seconds, and initialization reliability of >99.9%, it ensures fast acquisition of stable and accurate positioning data.
Industrial-Grade Design
Features 9-36V wide voltage input and integrates a 2W industrial-grade data transmission module supporting the 410-470MHz frequency band with LoRa protocol. Equipped with SMA antenna interfaces and an 8-pin LEMO data/power interface, it boasts an aluminum alloy shell, IP66 rating, and resistance to 1-meter free fall impact, making it suitable for harsh field environments.
Product Advantages
-
Full-System, Full-Frequency Support
Supports all major satellite navigation systems for global high-precision positioning
-
High-Power Data Radio
2W industrial-grade wireless module for longer transmission distance and better anti-interference capability
-
Exceptional Positioning Performance
Centimeter-level RTK positioning, fast initialization, high reliability
-
Easy Integration
Standard interface design, compatible with mainstream flight control systems for easy integration
Providing a reliable high-precision positioning solution for your surveying, agricultural, or UAV projects. Contact us today for a professional customized solution!
About Us
DALANG is a dedicated manufacturer of high-performance GNSS modules and RTK positioning solutions, serving industries such as UAV navigation, precision agriculture, and geospatial mapping. With a clear focus on accuracy, reliability, and integration flexibility, we support both standard and custom applications across global markets. Our product lines are engineered to meet the evolving demands of real-time positioning with support for multiple GNSS constellations, including GPS, GLONASS, BDS, and Galileo.
Our production facility spans 2,500㎡ and includes advanced SMT lines, in-house R&D labs, and full functional testing for every unit shipped. With a team of 30+ GNSS engineers, we design and manufacture over 200,000 GNSS receivers and modules annually. Certified to ISO9001:2015, and compliant with CE and RoHS standards, we follow a strict quality assurance process from prototyping through mass production. We also provide firmware updates, system integration support, and full lifecycle product documentation.
Trusted by partners in over 30 countries, DALANG delivers fast, scalable manufacturing with personalized technical support. Our streamlined collaboration model—covering inquiry, consultation, prototyping, and delivery—ensures efficiency from first contact to deployment. Whether you're sourcing off-the-shelf GNSS hardware or launching a customized solution, DALANG is your dependable partner for accurate, cost-effective positioning systems.
FAQ
1. Who are we?
We are DALANG, a specialized manufacturer of GNSS modules and RTK positioning systems based in China, with a focus on high-precision solutions for UAVs, surveying, and smart agriculture.
2. How can we guarantee quality?
All products undergo strict multi-stage quality control, including SMT production, functional testing, and 100% final inspection. We are ISO9001:2015 certified and follow international compliance standards such as CE and RoHS.
3. What can you buy from us?
You can purchase GNSS receivers, RTK modules, base stations, antennas, flight control positioning systems, and other GNSS-related components and accessories.
4. Why should you buy from us not from other suppliers?
We combine strong in-house R&D, flexible OEM/ODM support, industrial-grade quality assurance, and fast global delivery. Our expertise in GNSS RTK ensures stable, accurate, and scalable solutions tailored to your specific use case.
5. What services can we provide?
We offer OEM/ODM customization, technical consulting, firmware support, prototyping, and global after-sales service. Our team works closely with international clients to ensure efficient communication and long-term support.
