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BeiDou-3 Satellite Terminal

Published Time：2025-11-20 01:55

Brief： BeiDou-3 satellite terminal

BeiDou-3 satellite terminal

The Model M20C-V31 Beidou Data Transmission Terminal is an integrated device launched by Xiamen Chenmai Smart Technology Co., Ltd., designed for Beidou and 4G communication applications. It supports Beidou RDSS/RNSS and 4G communication functions. The terminal integrates functional modules including a Beidou multi-frequency antenna, radio frequency (RF) unit, baseband unit, and main control unit, enabling RDSS positioning, short message communication, and RNSS navigation and positioning functions. In addition, the Model M20C-V31 Beidou Data Transmission Terminal comes with a built-in 4G module, supporting data transmission via 4G networks.

Moreover, this product is equipped with an integrated RTU chip, thus providing RTU functionality. These features include support for scheduled data collection and reporting, as well as program version upgrades without losing existing configurations, ensuring full compatibility with legacy settings.

RDSS Parameters

Item	Performance Indicator	Remarks
Received Signal Sensitivity	≤ -124.6 dBm	Bit Error Rate (BER) ≤ 1×10⁻⁵; Azimuth: 0°～360°; Elevation: 20°～75°
Transmit ERIP	6 dBW～19 dBW	Azimuth: 0°～360°; Elevation: 20°～75°
Carrier Suppression	≥ 30 dBc
Modulation Phase Error	≤ 3°
Positioning/Communication	Positioning & communication success rate: ≥ 95%	Under no significant interference conditions
Acquisition Time	Cold start first fix time: ≤ 2 s	Timing starts when the RDSS functional unit is powered on
Received Signal Sensitivity	≤ -124.6 dBm	Bit Error Rate (BER) ≤ 1×10⁻⁵; Azimuth: 0°～360°; Elevation: 20°～75°

RNSS Parameters

Item	Performance Indicator	Remarks
Input Frequency Points	RNSS B1 + GPS L1
Data Update Rate	≥ 1 Hz	Default: 1 Hz
Time to First Fix (TTFF)	Cold start: ≤ 35 s	Open area, no significant interference
	Warm start: ≤ 2 s
	Reacquisition time: ≤ 2 s
Positioning Accuracy	Horizontal: ≤ 5 m	Open area
	Vertical: ≤ 10 m
Velocity Measurement Accuracy	≤ 1.0 m/s
Sensitivity	Acquisition: -144 dBm
	Tracking: -159 dBm

Wireless Parameters (Optional)

Item	Performance Indicator	Remarks
Wireless Module	Industrial-grade wireless module
Standards & Frequency Bands	Supports: FDD-LTE, TD-LTE, CDMA2000 1xEV-DO, WCDMA, TD-SCDMA, CDMA1X, GPRS/EDGE	Optional single-mode, multi-mode or full-network communication
Theoretical Bandwidth	FDD-LTE: Downlink 100 Mbps, Uplink 50 Mbps TD-LTE: Downlink 61 Mbps, Uplink 18 Mbps WCDMA: Downlink 42 Mbps, Uplink 5.76 Mbps TD-SCDMA: Downlink 4.2 Mbps, Uplink 2.2 Mbps CDMA2000 1xEV-DO Rev. A: Downlink 3.1 Mbps, Uplink 1.8 Mbps GPRS/EDGE: 171.2 kbps / 384 kbps
Transmit Power	< 24 dBm
Received Signal Sensitivity	< -109 dBm

Hardware System Parameters

Item	Description
CPU	Industrial-grade 32-bit communication processor
FLASH	1024 KB
SRAM	128 KB
SPI Flash	16 MB

Interface Parameters

Item	Details
Serial Ports	1-channel RS232 & 1-channel RS485 interface, built-in 15 KV ESD protection; Serial port parameters as follows: Data bits: 5, 6, 7, 8 bits Stop bits: 1, 1.5, 2 bits Parity: None, Even, Odd, Space, Mark Baud rate: 110～230400 bits/s
Antenna Interface	4G: 1×standard SMA female antenna interface, characteristic impedance 50 Ω
SIM/UIM Card Interface	1×standard user card interface, supports 1.8 V/3 V SIM/UIM cards, built-in 15 KV ESD protection
Application Interface	1-channel tipping-bucket rain gauge interface

Other Parameters

Item	Performance Indicator	Remarks
Operating Voltage	7 V～36 V
Serial Port Type	RS232	Default configuration
	RS485
Serial Port Baud Rate	4800～115200 bps	Default: 115200 bps
Power Consumption	Standby: ≤ 1.2 W	Power supply requirements: At 19 V, output current ≥ 500 mA
	Transmission: ≤ 5 W (transient power, ≤ 200 ms)
Temperature Range	Operating: -25～+70 ℃	(SIM card recommended operating temperature: -20～+60 ℃)
	Storage: -40～+85 ℃
Weight	≤ 450 g	Host weight only, excluding cables

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