Beidou Common View Observer

Product Overview

The MS4140 Beidou Common View Observer is a standard time traceability device. It consists of a high-precision antenna, a time comparison device host, and monitoring and data processing software. It can trace back to national standard time, enabling remote time transmission and regeneration (up to 1500 km). Basic functions include receiving and processing navigation system satellite signals using user-provided time and frequency signals as a measurement reference, locally storing and outputting raw observation data and common view data in real time, and ultimately enabling common view time comparison between different users through the exchange of common view data. Supporting software enables device monitoring and the generation and storage of common view files. The MS4140 Beidou Common View Observer comes in a 2U rack-mountable chassis and houses a time and frequency mainboard, Beidou common view receiver, rubidium atomic clock, and power module.

Basic Functions:

1. Civilian code common view timing, with optional military code.

2. An internal rubidium clock provides high-precision timekeeping in the event of external time loss.

3. The front panel includes a display, indicators, and buttons, providing status indication and graphical display functions. It offers both local and remote operation and control capabilities.

4. It features timed processing and output of data results in CGGTTS and RINEX 3.0 formats.

5. It supports 1PPS and 10MHz external reference inputs, and features common-view second output for 10MHz frequency signals.

6. It supports traceability to national time and frequency centers, enabling remote regeneration of national standard time.

7. It supports common-view relay functionality, enabling high-precision time transmission over longer distances.

8. It supports user-friendly host computer software.

9. It features instant fault alarm and reporting, enabling remote and online monitoring of device operating status via the network.

10. It can exchange common-view comparison data via the network interface.

11. It supports dual AC power supplies.

Technical Indicators

Classification	Indicator Item	Indicator Parameter
System Indicators	Common View Accuracy	≤5ns (maximum master-slave station distance 1500km)
	Timekeeping Accuracy	≤1μs/24h, 5μs/72h, 5ms/6m, 10ms/12m
	Position Accuracy	Horizontal error ≤ 1.5 meters, vertical error ≤ 3 meters
1PPS Reference Signal Input	Level	5V TTL
	Impedance	50Ω
	Interface	BNC-K1 channel
10M Reference Signal Input	Amplitude	10dBm±3dBm
	Impedance	50Ω
	Interface	BNC-K 1-channel
RF Input Signal	Frequency	BeiDou, GPS, GLONASS
RF Input Signal	Interface	TNC-K 1-channel
1PPS Output	Level	5V TTL
	Impedance	50Ω
	Time Accuracy	≤50ns
	Interface	BNC-K 4-way
10M Output	Level	10dBm±3dBm
	Frequency Stability	≤1E-11/s, ≤4E-12/10s, ≤1E-12/100s
	Frequency Accuracy	<1E-12 (24h average), <5E-12 (24h hold)
	Phase Noise	<-100dBc/Hz@1Hz; <-125dBc/Hz@10Hz; <-140dBc/Hz@100Hz; <-150dBc/Hz@1kHz; <-155dBc/Hz@10kHz; <-155dBc/Hz@100kHz
	Interface	BNC-K 4-way
B(DC) output	Level	RS422
	Time accuracy	GJB 2991A-2008: ≤200ns
	Interface	Aviation plug 1-way
1PPS+TOD output	Level	RS422
	Time accuracy	≤50ns;
	Format	8 data bits, no parity bit, 1 stop bit, 115200bps, data update rate 1Hz
	Interface	1-way aviation plug
E1 Output	Level	AC Level
	Impedance	75Ω Unbalanced
	Frequency Accuracy	<1E-12 (24h Average), <5E-12 (24h Hold)
	Interface	BNC-K 1 Channel
NTP Output	Voltage Level	Ethernet (Electrical)
	Time Accuracy	(NTP v2, v3 & v4, SNTP, MD5 protocols): ≤1µs
	Interface	Lockable RJ45 Plug (1-way)
PTP Output	Voltage Level	Ethernet (Electrical)
	Time Accuracy	≤100ns
	Interface	Locking RJ45 Aviation Plug 1-way
Common View Data	Data Format	CGGTTS, RINEX3.0
Common View Data	Interface	Locking RJ45 Aviation Plug 1-way
Management Interface	Network Port	RJ-45 1-way
Management Interface	Serial Port	RS232 1-way
Environmental Adaptability	Operating Temperature	-20°C ~ +60°C
Environmental Adaptability	Storage Temperature	-40°C ~ +75°C
Physical Characteristics	Dimensions	430mm450mm88mm Standard Cabinet 2U
Electrical Characteristics	AC Dual Power Supply	AC220V±22V, 50Hz±1Hz
Electrical Characteristics	Stable Power Consumption	≤30W

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