peter-tanner.github.io/_posts/2024-11-25-Chinese-ZHONGKEWEI-ATGM-GNSS-modules-comparison.md

title	author	date	categories	tags
Chinese ZHONGKEWEI ATGM* GNSS modules comparison	peter	2024-11-25 04:00:36 +0800	Electronics	gps gnss cheap comparison ublox

The ZHONGKEWEI ATGM* series of GNSS modules appear to emulate the popular u-blox NEO and MAX series and are (almost) pin compatible.

Model	GPS	BDS	GLONASS	Galileo	QZSS	VCC [V]	Interfaces	Internal SOC	TTFF [s]	Maximum output rate [Hz]	CEP50 [m]	Cost [AUD]
ATGM332D-6N-74	✅	✅	✅	✅	✅	2.7-3.6	UART,I2C,SPI	AT6668	23	10	1.5	5.3287
ATGM336H-6N-74	✅	✅	✅	✅	✅	2.7-3.6	UART,I2C,SPI	AT6668	23	10	1.5	5.3171
ATGM336H-5N31	✅	✅	❌	❌	❌	2.7-3.6	UART1,UART2	AT6558	32	10	2.5	4.6255
ATGM332D-5N31	✅	✅	❌	❌	❌	2.7-3.6	UART1,UART2	AT6558	32	10	2.5	4.1224
ATGM332D-5NR32	✅	✅	❌ (?)	❌	❌	1.8-3.6	UART1,UART2	AT6558R	32	5	2.5	4.0525
ATGM336H-5NR32	✅	✅	❌ (?)	❌	❌	1.8-3.6	UART1,UART2	AT6558R	32	5	2.5	3.8498
ATGM332D-5N11	✅	❌	❌	❌	❌	2.7-3.6	UART1,UART2	AT6558	32	10	2.5	5.9460
ATGM336H-5N11	✅	❌	❌	❌	❌	2.7-3.6	UART1,UART2	AT6558	32	10	2.5	5.0609
NEO-M9N (u-blox)	✅	✅	✅	✅	✅	2.7-3.6	UART,I2C,SPI,USB	UBX-M9140-KB	24	25	2.0	45

These parameters seem to be the same for all ATGM modules:

Key	Value	Note
Cold start sensitivity [dBm]	-148
Tracking sensitivity [dBm]	-162
Protocols	NMEA0183
Battery and RTC	✅
Lockout speed [m/s]	515	Not specified on AT6668?
Lockout altitude [m]	18000	Not specified on AT6668?
Lockout acceleration [g]	4	Not specified on AT6668?

The main differences compared to the NEO-M9N are:

• Significantly lower cost
• Lower maximum output data rate of only 10 Hz
• Slightly higher lockout speed of 515 m/s
• Lower lockout altitude of 18000 m (compared to 80000 m)
• Lacks USB and lacks UBX or any binary output format