Application of crystal oscillator in GPS clock system

YXC扬兴晶振

Application of crystal oscillator in GPS clock system [Copy link]

The Global Positioning System (GPS) is a system that provides positioning, navigation and timing services through satellites. GPS consists of multiple orbiting satellites, ground control stations and user equipment. Since its introduction, GPS has quickly attracted many users with its accurate and convenient positioning function.

Among the key components of the GPS system, the temperature compensated crystal oscillator (TCXO) plays an important role. The temperature compensated crystal oscillator (TCXO) is a type of active crystal oscillator that adds a temperature compensation circuit to an ordinary crystal oscillator. Its working principle is to reduce the impact of the change in the crystal oscillator output frequency caused by the change in the surrounding temperature through the additional temperature compensation circuit to meet the stability requirements within a wide temperature range. The frequency stability after compensation can reach the order of 10^-7 to 10^-6. Because the temperature compensated crystal oscillator has the characteristics of ultra-high precision and high stability, it can provide a highly stable clock signal for the GPS system.

Application of Temperature Compensated Crystal Oscillator in GPS Clock System

Provide high-precision clock: GPS receivers require high-precision, stable clock signals to parse and process GPS signals. Temperature-compensated crystal oscillators (TCXOs) can provide this high-precision clock, ensuring that GPS receivers can accurately measure signal transmission time and thus calculate precise locations.

Eliminate errors: GPS signals are subject to various interferences during transmission, such as electromagnetic interference and temperature changes. TCOs can reduce frequency drift caused by temperature changes and improve signal accuracy through their temperature compensation mechanism. In addition, TCOs can also shield false pulse signals and significantly improve the accuracy of the receiver.

Ensure signal synchronization: There are multiple components inside a GPS receiver that need to work together. A low-jitter temperature-compensated crystal oscillator can provide a stable clock signal to ensure signal synchronization between components. This synchronization is critical to maintaining high performance and stability of the entire navigation system.

Long-term stability: GPS systems need to operate stably for a long time. The high stability and low noise characteristics of the temperature-compensated crystal oscillator enable it to provide a stable clock signal over a long period of time, ensuring the reliability of the GPS system.

Based on the GPS system's stringent requirements for clock signals, the domestically produced high-precision crystal oscillator TCXO series - the YSO510TP series - is mainly aimed at applications such as satellite navigation, radar, base stations, and wireless communications.

The features of YXC TCXO temperature compensated crystal oscillator YSO510TP series are as follows:

Frequency stability up to ±0.28ppm, ensuring high signal quality and precise frequency (±2.5ppm)

Wide frequency range: 10MHz~52MHz

Multiple voltage options: 1.8V, 2.5V, 3V, 3.3V

Miniature size: 2.0 x 1.6mm, 2.5 x 2.0mm miniature size options are available for circuit designs with limited PCB space

Support CMOS/Clipped Sine Wave output mode