Many application domains rely heavily on location-based services, especially with higher demands for positioning accuracy in mobile devices. These include areas such as autonomous driving, smart transportation, smart mining, smart ports, smart agriculture, aviation and maritime, geographic data collection, and high-precision measurements, all of which are heavily dependent on satellite navigation positioning.
In satellite positioning and navigation applications, GPS requires precise time measurement when calculating position and velocity information, including the time information of satellite and local clocks. Local clocks typically use crystal oscillators, with less stringent accuracy requirements than satellite clocks. The clock offset and clock drift can be eliminated as a common term for positioning speed measurement error. The clock signal output from the local oscillator directly affects receiver performance, significantly impacting the capture and tracking performance of satellite positioning and navigation signals, especially in harsh operating environments such as vibration and high dynamics.
During satellite navigation positioning, when the GNSS receiver receives signals, the crystal oscillator is subject to various external interferences, causing certain fluctuations in output frequency and phase. When the fluctuations are significant, it can cause the receiver loop to lose lock, resulting in the loss of satellite signals.
The tracking loop error of the GNSS receiver mainly includes thermal noise σtPLL, crystal oscillator noise, and dynamic stress error θe. Additionally, the crystal oscillator noise is further divided into phase noise σv and jitter θA caused by short-term stability.
(Formula 1)
The phase noise and short-term stability of the crystal oscillator are mainly determined by the frequency stability, frequency slope, and G-sensitivity of the crystal oscillator. As Formula 1 shows, the frequency stability, frequency slope, and G-sensitivity of the crystal oscillator will have a significant impact on the performance of the PLL tracking loop of the satellite receiver, which is the main factor causing the loss of lock in the GNSS receiver loop. Therefore, when selecting a crystal oscillator for the GNSS receiver, it is crucial to focus on these parameters.
In the multitude of crystal oscillators, TCXO can provide a persistent, stable, and accurate clock signal for GNSS receivers, with high stability (in the range of 10-7 to 10-6), resistance to temperature changes, low G-sensitivity, low noise, ensuring good start-up characteristics, low power consumption, and long-term reliable operation of GNSS devices.
Dapu Technology has independently developed high-precision temperature compensation algorithms and holds a leading position in terms of the number of domestic and foreign invention patents in the segmented field. It has developed high-precision temperature compensation chips (TCXO-IC) and TCXO fully automated production testing system, with key indicators such as frequency stability, phase noise, short-term stability, frequency slope, and G-sensitivity all leading the industry, making them an excellent fit for satellite positioning and navigation applications.
Currently, DAPU has a full range of TCXO products, including high frequency, high precision, low phase noise, low power consumption, wide temperature range, miniaturization and other series, with stronger international competitiveness and better cost performance.
DAPU TCXO Advantages:
Frequency Range:
10MHz~70MHz
High Frequency Stability:
±0.05ppm@-40℃~+85℃ (5032/7050)
±0.28ppm@-40℃~+85℃ (1612/2016/2520/3225)
Low Phase Noise:
-145dBc/Hz@1KHz typ.
Low Power Consumption:
5mA (5032/7050)
1.5mA (1612/2016/2520/3225)
Wide Temperature Range:
-40~+85℃
-55~+85℃
-40~+105℃
-55~+105℃
Frequency Slope VS Temp. :
±0.1ppm/℃ @-40~+85℃
Low G-Sensitivity:
<1.5ppb/g
Miniaturization:
1.6*1.2*0.65mm (1612)
2.0*1.6*0.7mm (2016)
2.5*2.0*0.8mm (2520)
3.2*2.5*0.9mm (3225)
Cost-Effective: DAPU TCXO adopts self-developed temperature-compensated chip (TCXO-IC) and fully automated production testing system, not only improving product yield and production efficiency, but also significantly reducing costs.
Quality Assurance: DAPU TCXO has been certified by multiple well-known high-precision positioning module manufacturers and has entered their supply chain.
Delivery Guarantee: DAPU TCXO has achieved mass production with a shipment volume exceeding tens of millions, and has been applied in various industries.
For more details, feel free to contact us!
Email: sales@dptel.com
Website: www.dptel.com
Telephone: +86-0769-88010888
Mobile: +86-180-6899-8889