GXY CORE DRILLING RIG Gxy Drilling Rig,Core Drilling Rigs,Core Drilling Rig Companie,Gxy Core Drilling Rig JIANGSU XI TEC ENVIRONMENTAL&DRILLING EQUIPMENT COMPANY CO.LTD , https://www.nbxitecdrilling.com
Quick Detail:
1. GXY drilling has large input power and output torque. Its drilling capacity is strong. Its capacity of dealing with accidents is good. It has an oil pressure feeding structure and its labour intensity is low.
2. The drill is suitable in the mountain area because it can be carried easily for light weight.
3. The drill and the pump are transmitted separately, improving the output torque and avoiding the accidents in the hole.
4. Oening the clinostat, it is easy to lift and loose the drill.
Description:
1. GXY is a spindle type drill. It can be used in engineering geological exploration, survey and exploration of solid mineral deposit, blasting engineering hole, inspecting hole of various concrete stucture, etc.
2. According to various layer, it can be drilling with diamond bit, hard alloy bit, auger bit, etc.
3.The drill is suitable in the mountain area because it can be carried easily for light weight.
4.The drill is convenient for maintenance and repair for simple structure and reasonable layout.
5. Opening the clinostat, it is easy to lift and loose the drill.
Most of the NB-IoT services that have been commercially available in the industry are based on fixed-location access. Terminals with mobile service requirements need to obtain positioning information through GPS. However, the GPS module consumes a large amount of power and cannot meet the requirements of the NB-IoT service for low power consumption. Therefore, in the R14 phase, the 3GPP protocol introduces two positioning technologies - E-CID and OTDOA. This technology can support a large number of R13 terminals on the live network, with a positioning accuracy of up to 50 meters, meeting the current mainstream business needs.
GPS positioning error is 10 to 20 meters. The accuracy of NB-IoT positioning 50 meters is still far from GPS. And for practical applications, the experience gap is very obvious. For example, sharing a bicycle allows the user to find a car within a range of 50 meters and find a car within a range of 10 meters. The experience gap is huge. Therefore, if you want to replace GPS, NB-IoT positioning requires higher precision.
Moreover, if the positioning accuracy of the NB-IoT is within 10 meters, in addition to replacing the GPS, it can also be used for indoor positioning. There is no good solution for the current indoor positioning. GPS has no signal indoors. The current mainstream wifi, iBean, etc. require a large number of stations, data collection and other preliminary work. The NB-IoT has a signal indoors and does not need to be stationed. If the accuracy is acceptable, it will become a strong indoor positioning technology.
Can NB-IoT positioning accuracy be improved? The answer is certainly yes. The OTDOA used by NB-IoT is a positioning technology based on arrival time. The positioning accuracy of this technology is closely related to the signal bandwidth. The wider the bandwidth, the higher the accuracy. The NB-IoT is a narrowband system with a narrow bandwidth of only 180KHz, which limits its positioning accuracy.
To this end, we propose a way to use signals from adjacent multiple carrier frequencies, combined together, to become a wideband positioning signal for operation. In this way, the bandwidth of the positioning signal is widened and the accuracy is increased. It is verified by experiments that when the positioning signals of four carrier frequencies are combined and calculated, the positioning accuracy can reach 5 meters. This accuracy is sufficient to replace GPS and is also sufficient for indoor positioning applications.
On the base station side, there are generally multiple carrier frequency configurations, and the requirements of multiple carrier frequencies can be met. On the terminal side, since the number of OFDM symbol CP points in the physical layer must be an integer, the sampling rate of the system is at least 1.92 MHz. The 1.92MHz sampling rate can accommodate at least 8 carrier frequencies within the bandwidth. That is to say, the terminal hardware will receive data of multiple carrier frequencies. Using adjacent positioning signals to operate together, no hardware modification is required, and terminal cost is not increased.
The verification system uses two devices, one analog base station and one analog terminal, and uses the round-trip time method to determine the distance between the two devices. The device uses four carrier frequency positioning signals for positioning operations. The experimental results show that the distance measurement error is less than 5 meters. Based on this, it can be inferred that the positioning using this method can also achieve similar accuracy. In this experiment, the experimental distance is only 20 meters due to the hardware power of the device. However, since the location accuracy of the arrival time method is not related to the distance, the conclusion is not affected.
Conclusion, using multi-carrier aggregation method for positioning can effectively improve the positioning accuracy to 5 meters. Such precision is sufficient to replace GPS, so that terminals with mobile service requirements do not need to install GPS modules, saving cost and reducing power consumption. In addition, this technology can also be used for indoor positioning, making the application range of NB-IoT more extensive.