Description

 

GPSDO GPS Disciplined Oscillator GPS Disciplined Clock 10MHz GPS Frequency Standard Square Wave

Description:
GPS can realize the determination of position. Its principle is to determine the distance between the receiver and a certain satellite by calculating the propagation time difference between the signal sending time and the receiving time. By measuring the position relationship with different satellites, the geographic location of the receiver is determined. In this process, it is very important to determine the precise time of signal emission. It can be said that the accuracy of GPS positioning directly depends on the accuracy of the clock on GPS satellite. In order to ensure the accuracy of the clock, a very precise atomic clock is used on the satellite and is corrected by the ground station every day. The on-board clock also corrects the relativistic time changes caused by the high-speed movement of the satellite by calculating relativity errors. Theoretically, through such a series of methods, the GPS satellite clock can be accurate to about 14 nanoseconds.

The signal sent by GPS carries the time stamp of the exact time when the signal was transmitted. Because of the high accuracy of the on-board clock, the long-term characteristics of the time stamp of this signal are very stable. However, considering the influence of interference, propagation attenuation and multipath effects in the signal propagation, its short-term stability is not high. Although ordinary oscillators can generate very high-precision signals in a short time, they will drift with the passage of temperature, working time and other environmental factors-that is, its long-term stability not good. GPS tame clock is just such a device that combines the advantages of the two.

GPS disciplined clocks are mostly used as reference source for precision measuring instruments, and some are used in daily life.

Color Screen Display:
* Real-time GPS signal strength
* Date and time (default time zone UTC+8)
* Real-time latitude and longitude display

Frequency Accuracy:
* Less than 1e-8, up to 1e-10

Frequency Stability:
* Short-term frequency stability is less than 3e-10
* Long-term frequency stability is less than 2e-10, as shown in the figure below.

Picture: Allan Variance Graph

Reference Oscillator:
* 10MHz SC cutting constant temperature crystal oscillator (OCXO)

GPS Receiver:
* Using high-precision 4-mode (for GPS, Galileo, GLONASS, Beidou) receiver, timing accuracy <30ns, positioning accuracy <5m/16.4ft.

Power Supply & Power Consumption:
* This product uses a 6V-9V optional wide power adapter for power supply, the maximum input power is 9W. Due to the characteristics of the reference oscillator, the power consumption at first startup is about 5W, and the power consumption after stabilization is always less than 3W.
             
Front Panel:


Indicators:
After the GPS disciplined clock is powered on, the meanings of these two lights on and off are as follows:
* FREQ LOCK: Off; GPS LOCK: Flash – Please insert GPS antenna.
* FREQ LOCK: Always on (flash); GPS LOCK: On – It is calibrating frequency.
* FREQ LOCK: Off; GPS LOCK: On – Frequency has been calibrated.
* FREQ LOCK: On; GPS LOCK: Off – Product failure.
* FREQ LOCK: Off; GPS LOCK: Off – Product failure.

Display Area:
* Current GPS signal, date and time, latitude and longitude are displayed here.


Rear Panel:
* 10MHz OUT: A 10MHz frequency output BNC interface.


Output square wave, peak-to-peak value is about 1.2V when impedance is 50Ω, and the peak-to-peak value is about 2.5V when the output is 1MΩ.

Picture: 10MHz Square Waveform

The rise and fall time is about 1ns.

Picture: 10MHz Square Wave Rising Edge


Picture: 10MHz Square Wave Falling Edge

Package Included:
- 1 x Set of GPS Disciplined Clock