1. Satellite clock error

Since the position of the satellite is a function of time, the GPS observations are based on precise measurements, and the information corresponding to the satellite position is transmitted to the receiver via the encoded information of the satellite signals. In GPS positioning, whether it is code phase observation or carrier phase observation, satellite clock and receiver clock are required to maintain strict synchronization. In fact, although GPS satellites are equipped with high-precision atomic clocks (铷 and 铯), there are still unavoidable deviations and drifts between them and the ideal GPS time. The total amount of this deviation is within about 1ms.

Such deviations from the satellite clock can generally be determined by the satellite's master control station, through the continuous monitoring of the operating state of the satellite clock, and provided to the receiver through the satellite navigation message. After the clock correction, the synchronization difference between the satellites can be kept within 20ns.

In relative positioning, the satellite clock difference can be eliminated by observing differences (or differences).

2. Satellite orbit deviation

It is difficult to estimate and deal with orbital deviations of satellites. The main reason for this is that satellites are subject to the complex effects of various perturbations in their operation. It is difficult to measure these forces fully and reliably through the ground monitoring stations and to grasp their role. The law, at present, satellite orbit information is arrived through the navigation message.

It should be said that satellite orbit error is one of the major sources of error in current GPS surveys. The longer the measured baseline length, the greater the impact of this error.

In GPS positioning measurement, there are the following direct methods for processing satellite orbit error:

1) Ignoring the orbit error This method is based on the satellite orbit information obtained from the navigation message and does not consider the actual orbit error of the satellite orbit. Therefore, it is widely used in real-time single-point positioning with low precision.

2) Using the orbit improvement method to process observation data This method involves the introduction of correction parameters that characterize satellite orbital deviations in data processing, and assumes that these parameters are constant in a short time, and is solved together with other knowledge numbers.

3) The method of obtaining the difference of synchronous observations is to use the same observation value of the same satellite to obtain the difference in two or more observation stations. To reduce the impact of satellite orbital errors. Because the same satellite's position error affects the simultaneous observation of different observing stations and has the nature of system error, the above method of obtaining difference can significantly reduce the influence of satellite orbit error, especially when the baseline is shorter, its utility is even less. obvious.

2023 New Hot Sale Fiber Laser Cutting Machine A Series

The imported helical gear design of the reducer can withstand greater torque than the general straight tooth output.
High precision, small product volume, low noise, fully enclosed design, to ensure that the lubricating grease does not leak, and the transmission efficiency is as high as 95%.
The internal components are made of alloy steel, which can cope with various harsh environments.
Laser head structure
1.The Z axis refers to the direction in which the laser head moves up and down
2.Structural composition: 1. Servo motor; 2. Guide rail slider; 3. Mounting seat; 4. Laser head, etc.
3.Structure introduction: It can adapt to different specifications of pipes by adjusting the up and down movement of the laser head.

4.Structural advantages: the mechanism is simple, stable and easy to operate.

The Z-axis can be both follow-up and numerically controlled: in order to solve the problem that the laser focus fluctuates due to the uneven surface of the pipe, which affects the cutting quality, the cutting head (Z-axis) must follow to keep the focus constant. In addition to the follow-up function, the Z axis of the cutting machine also has the same display and control functions as the X and Y axis.

Graphic display: The machine has the functions of analog graphic display and dynamic graphic tracking display for the edited part program, which makes the processing more intuitive and easy to monitor and control.

Multiple alarm functions: The CNC system of the machine has the functions of self-checking, alarming and automatic protection, and also has alarm display and automatic protection for external conditions.

CNC control system: The system adopts an integrated structure, central control and display operation unit structure. The system is based on windows CNC system. The display operation unit provides a good man-machine interface and displays various operation information. The operation panel has function keys for machine tool operation.

Low-voltage electrical system: The low-voltage electrical system is located in the electric control cabinet, which is the interface part of the electrical control of the whole machine. The power supply, relays, circuit breakers, contactors, and servo drive systems required by the electrical control system are installed in the electric control cabinet.

Using high-quality stainless steel cold water circulating pump, large flow, high lift, low noise, long life; stainless steel water tank, pipeline, stainless steel valve will never worry about rust.

The control system adopts LCD full Chinese (or full English) computer controller, CPU automatic control, simple and intuitive operation. The control accuracy is as high as ±0.1℃; it has the function of automatic fault diagnosis, which directly displays the fault point on the screen, prompting the user to deal with it quickly. And the fault signal can be directly transmitted to the CNC numerical control system through the data line to avoid damage to components and equipment.

Provides multiple protection functions, passive alarm terminals, and remote control terminals, which are easy to realize centralized control and monitoring of CNC; among them, the "dual temperature type" precision water cooler provides stable and accurate water temperature control for the laser, and also provides a channel with The water temperature similar to the ambient temperature is used for lens cooling, which solves the problem of damage to the lens caused by condensation when cooled with low-temperature water, and is the best choice for cooling the entire laser equipment.


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GUANGDONG CHITTAK INTELLIGENT EQUIPMENT CO.,LTD , https://www.ctkcutting.com

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