DM227 Beidou-III regional one-line communication positioning module

DM227

TheDM227Beidou-3regionalone-waycommunicationpositioningmodule(hereinafterreferredtoas"DM227module")isaone-waycommunicationpositioningmoduleforBeidou-3developedbasedonthe"Dolphin-3"basebandchipindependentlydesignedbyChangshaJinwei.ItcanachieveBeidou-3regionalshortmessagecommunicationandiscompatiblewiththeRDSScommunicationfunctionofBeidou-2.ThemodulecanalsoreceivetheB1IandB1CfrequencypointsofRNSSandc..

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Product features

Fully support the regional short message application of the Beidou-3 system
Supports 1000-character communication Passes network testing Meets the power requirements for Beidou transmission
Support multiple detection interfaces of the one-stop connection type
Supports power detection one-wire antenna and voltage detection one-wire antenna. Supports wide voltage range from 5V to 32VDC for power supply. Can flexibly achieve the design of split-type terminal.
Strong anti-interference capability
It has the function of suppressing adjacent-frequency signal interference such as WIFI, Bluetooth and 4G, resulting in more stable performance.
High integration and easy to use
35mm × 35mm small size, SMT stamp holes, facilitating integrated installation

Technical Index

performance index	Performance of RDSS	Receiving frequency point	Receive the outgoing signals from S1I and S2C, with the frequency range: 2491.75 MHz ± 8.16 MHz
		Receive sensitivity	S1I: When the signal power is -127.6 dBm, the bit error rate is: ≤ 1×10-5
			S2C: 24kbps information frame, bit error rate: ≤ 1×10-5 (signal power - 123.8 dBm)
			S2C: 16kbps information frame, bit error rate: ≤ 1×10-5 (signal power - 127.5 dBm)
			S2C: 8kbps information frame, bit error rate: ≤ 1×10-5 (signal power - 130dBm)
		Number of receiving beams	Beidou-2: 10; Beidou-3: 14
		First capture time	≤2s
		Transmitting frequency point	Lf0：1615.68 MHz±4.08MHz
			Lf1 ：1614.26 MHz±4.08MHz
			Lf2 ：1618.34 MHz±4.08MHz
		Output power of the one-line connection	-2dBm~2dBm
		Accuracy of transmission frequency	≤5×10^-7
		Phase error of transmitted signal modulation	≤3°
		Short message communication capacity	The maximum length of a single message for Beidou-2 is 120 Chinese characters.
			The maximum length of the regional message for Beidou-3 is 1,000 Chinese characters.
	RNSS performance	Receiving frequency point	B1I、B1C、L1C（GPS）
		positional accuracy	Horizontal distance ≤ 6m (95%, HDOP ≤ 4), Elevation ≤ 8m (95%, VDOP ≤ 4)
		test precision	0.2m/s（1σ）
		positioning time	Cold start ≤ 45 seconds, hot start ≤ 15 seconds
		Recapture time	≤5 seconds (95%, satellite signal interruption for 30 seconds)
		receive sensitivity	Capture ≤ -135 dBm; Tracking ≤ -145 dBm
		Timing accuracy	≤200ns
	Performance requirements for the one-line connection interface	Feed output range	+5V~+32VDC
		External antenna receiving gain	30dB~40dB
		External antenna transmission gain	35dB~37dB（5W power amplifier）
	Power characteristics	Receiving working voltage: +3.6V to +5.5V. Recommended: 3.7V
		Input voltage for the one-line antenna: +5V to +32V
	Power dissipation	Operating power consumption: ≤ 320mA @ +3.7V
physical property	Structure size		35mm×35mm×3.5mm
	Encapsulation mode		SMD Postmark hole
	Weight		≤12g
environmental index	Operating temperature		-40℃~+85℃
	Storage temperature		-40℃~+85℃