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Home > GNSS RTK receiver > All-System All-Frequency GNSS/GPS/RTK 4G Bluetooth Receiver Ntrip Protocol IMU QianXun/CORS/Self-Built Base Station

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All-System All-Frequency GNSS/GPS/RTK 4G Bluetooth Receiver Ntrip Protocol IMU QianXun/CORS/Self-Built Base Station

Name: All-System All-Frequency GNSS/GPS/RTK 4G Bluetooth Receiver Ntrip Protocol IMU QianXun/CORS/Self-Built Base Station
Brand: Dalang Communication
SKU: AK987M
Price: 7.9 USD
Availability: InStock

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Model:AK987M
Working frequency band: BDS/GPS/GLONASS/GALILEO/QZSS
Function：Rover/Base
RTK accuracy：cm-level
IMU: Built-in 6-axis, Deep Coupling Positioning
Output protocol：NMEA0183、RTCM3.X
Data update rate：1Hz - 20Hz (default1Hz)
4G frequency band：LTE FDD:B1/3/5/8 LTE TDD:B34/38/39/40/41
4G protocol：Ntrip
Bluetooth：BT 2.0
Voltage：DC +9V~36V
Power consumption：<3W
Connector：SMA-J*2 / 8-core LEMO ports
Size(mm)：100*61.8*18.75
Weight：180g

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Model specifications:

AK987M+AK700 complete set

AK987M+AK628 complete set

AK987M+AK181 complete set

AK987M+AK161 complete set

AK700+base+TNC-TNC 5m adapter cable

AK700+base+TNC-SMA 5m adapter cable

Single AK987M

Single AK700

Single AK628

Single AK181

Single AK161

M8-8P aviation head cable

Single TNC-SMA 5m adapter cable

Single TNC-TNC 5m adapter cable

Single M90SD strong magnetic base

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Description

丨 Product Introduction

Product Introduction
The AK987M is a GNSS receiver integrating 4G transmission and high-precision integrated navigation positioning. It supports full-system multi-frequency signal reception, features a built-in MEMS IMU and deep coupling algorithm, and is compatible with the Ntrip protocol as well as base stations such as Qianxun and CORS. Equipped with satellite augmentation technology, it can achieve stable positioning even in areas without 4G networks. With a 9-36V wide voltage input and IP65 protection rating, it is adaptable to multiple scenarios and widely used in fields like intelligent driving and precision agriculture.

Core Features
1. Full-system multi-frequency positioning: Covers all constellation signals including BDS/GPS, with 1507 receiving channels.

2. 4G network differential: Supports the Ntrip protocol and is compatible with various network base station services.

3. Deeply coupled navigation: Built-in MEMS IMU enhances positioning continuity in occluded environments.

4. Strong anti-interference performance: 65dBc narrowband anti-interference to cope with complex electromagnetic environments.

5. Multi-interface output: Supports dual output via RS232 and Bluetooth to meet the connection needs of various devices.

6. Wide voltage adaptation: DC 9-36V wide voltage input, suitable for vehicle-mounted and industrial environments.

7. Satellite augmentation: Supports L-Band and other satellite augmentation technologies, covering remote areas without 4G networks.

丨 Specification parameters

Specifications
GNSS module	1	operating frequency	BDS-3: B1I, B1C, B2a, B2b GPS: L1 C/A, L1C, L2, L5 GLONASS: G1, G2 Galileo: E1, E5a, E5b, E6 QZSS: L1C/A, L1C, L2, L5, L6 SBAS: L1C/A (Supports L-Band satellite based enhanced signal)
	2	reception channel	1507 channel
	3	Single point positioning (RMS)	Plane: 1.5m
	3	Single point positioning (RMS)	Elevation: 2.5m
	4	RTK(RMS)	Flat: 0.01m+1ppm
	4	RTK(RMS)	Elevation: 0.015m+1ppm
	5	startup performance	Cold start:<30s
			Hot start:<5s
			RTK initialization:<5s (typical value)
			Lost lock recapture: ≤ 1s
	6	anti-interference capability	Dry to solid ratio (J/S): ≥ 65dBc Supporting interference types: sweep frequency, single frequency, multi tone, narrowband, pulse
	7	Gyroscope performance	Range: ±300°/s
	7	Gyroscope performance	Zero bias instability (Allan variance):5°/h
	8	Performance of accelerometer	Range: ±16g
	8	Performance of accelerometer	Zero bias instability (Allan variance):：50μg
	9	Dead reckoning (DR) accuracy	Distance error: 0.8% (2 σ, connected to odometer)
	10	Speed accuracy (RMS)	0.03 m/s
	11	Timing accuracy (RMS)	20ns
4G module (Network frequency band)	1	LTE FDD	B1/3/5/8
	2	LTE TDD	B34/38/39/40/41 (full frequency band)
	3	GSM/GPRS/EDGE	NA
4G module (Spread speed)	1	LTE FDD (Mbps)	10.3(DL)/5.1(UL)
4G module (Spread speed)	2	LTE TDD (Mbps)	9.1(DL)/3.1(UL)
Bluetooth module	1	Bluetooth version	2.0
	2	operating frequency band	2.4G
	3	Air speed	2Mbps
	4	reference distance	10m
Data format	1	differential data	RTCM3.X
	2	output format	NMEA-0183, RTCM3.X
	3	Data update rate	1Hz-20Hz (default 1Hz)
	4	INS/IMU raw data update rate	100Hz
Power supply	1	voltage	DC +9V~36V
	2	power consumption	＜3W
	3	operating current	≤145mA/12V
	4	indicator light	1NET，1RTK，1BT
Physical parameters	1	size	100mm61.8mm18.75mm
	2	weight	180g
	3	housing material	aluminium
	4	interface	SMA*2/M8-8Paviation connector
Environment	1	Operating Temperature	-30℃～＋70℃
	2	Storage temperature	-40℃～＋85℃
	3	humidity	95% condensation
	4	Protection grade	IP65
	5	seismic resistance	Resist the impact of a 1-meter free fall

丨 product mix

Table 1 M8 Interface Definition

Serial Number	Interface Name	Function Introduction
1	USB-D-	Parameter configuration USB interface D-
2	VCC	power input DC9-36V
3	NC	empty
4	NC	empty
5	RS232-TXD	RTK positioning output RS232-TXD
6	RS232-RXD	RTK positioning output RS232-RXD
7	USB-D+	Parameter configuration USB interface D+
8	GND	Grounding
Antenna interface
1	GNSS	Active positioning antenna, 3.3V, SMA interface
2	NET	4G antenna interface, SMA

Schematic diagram of connecting wires：

Display of the complete set of solutions：

Table 2 Complete Component Description

Number	Name	Quantity	Remarks
1	AK987M terminal	1
2	Connecting line	1	M8 aviation head to type C; DC-DC power supply; DB9 female head
3	GNSS antenna	1	Full system full frequency antenna
4	Coaxial line	1	5mTNC to SMA, 50-3 wires
5	4G antenna	1	SMA connector

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

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AK161：

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