Introduction to GNSS RAW measurements provided by Android N
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This document introduces RAW GNSS measurements provided by the Android Nougat API. It discusses how the new API allows access to pseudoranges and carrier phase measurements directly from GNSS chips. This level of access was previously only available to GNSS experts and provides opportunities to improve positioning accuracy through sensor fusion and external corrections. The document also addresses challenges in working with the new API and limited hardware support currently from mobile chipset vendors.
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A talk from the Develop Track at AWE USA 2017 - the largest conference for AR+VR in Santa Clara, California May 31- June 2, 2017.
Philipp Nagele (Wikitude): What's Next with Wikitude
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http://AugmentedWorldExpo.com
Continuous Delivery with Jenkins & Kubernetes @ Sky
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Edge optimized architecture for fabric defect detection in real-time
In textile industry, fabric defect relies on human inspection traditionally, which is inaccurate, inconsistent, inefficient and expensive. There were automatic systems developed on the defect detection by identifying the faults in fabric surface using the image and video processing techniques. However, the existing solution has insufficiencies in defect data sharing, backhaul interconnect, maintenance and etc. By evolving to an edge-optimized architecture, we can help textile industry improve fabric quality, reduce operation cost and increase production efficiency. In this session, I’ll share:
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Why textile industry can benefit from edge computing infrastructure
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GeoSLAM is a global leader in 3D mobile mapping technology. Their unique "go anywhere" solutions allow for accurate 3D mapping of indoor, outdoor, and difficult to access environments without GPS. Their flagship ZEB-REVO system rapidly maps spaces in minutes using simple, rugged hardware and user-friendly software. GeoSLAM's technology and strategic partnerships provide solutions for applications across surveying, engineering, facilities management, mining, forestry, and more.
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Philipp Nagele (Wikitude): What's Next with Wikitude
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学校原版美国波士顿大学毕业证学历学位证书原版一模一样
原版一模一样【微信：741003700 】【美国波士顿大学毕业证学历学位证书】【微信：741003700 】学位证，留信认证（真实可查，永久存档）offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原海外各大学 Bachelor Diploma degree, Master Degree Diploma
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留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
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5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
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TIME DIVISION MULTIPLEXING TECHNIQUE FOR COMMUNICATION SYSTEM
Time Division Multiplexing (TDM) is a method of transmitting multiple signals over a single communication channel by dividing the signal into many segments, each having a very short duration of time. These time slots are then allocated to different data streams, allowing multiple signals to share the same transmission medium efficiently. TDM is widely used in telecommunications and data communication systems.
### How TDM Works
1. **Time Slots Allocation**: The core principle of TDM is to assign distinct time slots to each signal. During each time slot, the respective signal is transmitted, and then the process repeats cyclically. For example, if there are four signals to be transmitted, the TDM cycle will divide time into four slots, each assigned to one signal.
2. **Synchronization**: Synchronization is crucial in TDM systems to ensure that the signals are correctly aligned with their respective time slots. Both the transmitter and receiver must be synchronized to avoid any overlap or loss of data. This synchronization is typically maintained by a clock signal that ensures time slots are accurately aligned.
3. **Frame Structure**: TDM data is organized into frames, where each frame consists of a set of time slots. Each frame is repeated at regular intervals, ensuring continuous transmission of data streams. The frame structure helps in managing the data streams and maintaining the synchronization between the transmitter and receiver.
4. **Multiplexer and Demultiplexer**: At the transmitting end, a multiplexer combines multiple input signals into a single composite signal by assigning each signal to a specific time slot. At the receiving end, a demultiplexer separates the composite signal back into individual signals based on their respective time slots.
### Types of TDM
1. **Synchronous TDM**: In synchronous TDM, time slots are pre-assigned to each signal, regardless of whether the signal has data to transmit or not. This can lead to inefficiencies if some time slots remain empty due to the absence of data.
2. **Asynchronous TDM (or Statistical TDM)**: Asynchronous TDM addresses the inefficiencies of synchronous TDM by allocating time slots dynamically based on the presence of data. Time slots are assigned only when there is data to transmit, which optimizes the use of the communication channel.
### Applications of TDM
- **Telecommunications**: TDM is extensively used in telecommunication systems, such as in T1 and E1 lines, where multiple telephone calls are transmitted over a single line by assigning each call to a specific time slot.
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- **Computer Networks**: TDM is used in network protocols and systems to manage the transmission of data from multiple sources over a single network medium.
### Advantages of TDM
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2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
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Introduction to GNSS RAW measurements provided by Android N
- 1. Introduction to GNSS RAW measurements provided by Android N WhereCamp Berlin Lukasz K Bonenberg NGI, University of Nottingham 1
- 2. RAW GNSS? Figure 1: Android Nugat 2
- 3. meaning? 3
- 5. New Android Nugat API v24+ Figure 3 5
- 7. It’s hardware stupid Figure 4 7
- 8. GNSS experts only? Figure 5: Pseudoranges L = Treceiver arrival − T satellite transmission c 8
- 9. Mass market? • Limited hardware at this stage1 • hardware forced to comply from mid 2017 • No battery drain but.. • Duty cycle - problem with clocks • many producers, many implementation • market coverage? 1 • Qualcomm Snapdragon 650, 820 • Broadcom BCM4774 • Intel WCS2x00 9
- 10. Help is here Google released Matlab code showing: • example logger application • the details of obtaining pseudoragnes • calculating position I work on python version 10
- 11. What about API • most devs focus in high abstraction - gms.location • for RAW measurements use android.location • not so easy to use • check Matlab code for implementation details • google . . . 11
- 13. Improved position • using external corrections (DGPS) • reduce errors in urban areas (GNSS shadowing) • use sensor fusion • use carrier phase measurements? • improving on antenna ? 13
- 14. Other? • mass market applications • data collection & analysis • position quality estimation • data fusion • . . . 14
- 15. Live demo 15
- 16. Useful links • Google code • my gitHub with python code • my gitHub with edits to google code • Simon Banville blog • Rokybun blog 16