Do you want to publish a course? Click here

Influence of observation mode and number of GPS receivers in accuracy of calculating coordinates of points

تأثير عدد مستقبلات نظام تحديد المواقع العالمي GPS على دقة تعيين نقاط الشبكات الجيوديزية

1373   1   109   0 ( 0 )
 Publication date 2016
  fields topography
and research's language is العربية
 Created by Shamra Editor




Ask ChatGPT about the research

GPS technology considers the essential tool for establishing geodetic networks. Static method of GPS is used often in observing geodetic network points. Establishing geodetic networks using GPS requires accuracy, consistency and economency. This paper discusses influence of observation mode and number of GPS receivers in accuracy of calculating of coordinates of points. Coordinates of network points are clculated using tow and three GPS receivers and with diferent methods like radial, traverse, network. Comparison between coordinates for network points obtained by several cases is performed. The differences between coordinates indicate accuracy of network method in calculating coordinates when three or more receivers are avlible. When tow receivers are avilable the radial method is the best in accuracy and consistency.


Artificial intelligence review:
Research summary
تناولت هذه الدراسة تأثير عدد مستقبلات نظام تحديد المواقع العالمي (GPS) على دقة تعيين نقاط الشبكات الجيوديزية. تم استخدام طرق مختلفة مثل الطريقة الشعاعية والمضلعية والشبكية لحساب إحداثيات نقاط الشبكة باستخدام جهازي استقبال وثلاثة أجهزة استقبال. أظهرت النتائج أن الطريقة الشبكية تعطي دقة عالية عند استخدام ثلاثة مستقبلات أو أكثر، بينما تكون الطريقة الشعاعية الأفضل عند استخدام جهازي استقبال فقط. تم تحليل البيانات باستخدام برنامج HDS2003 وتم تحويل الإحداثيات إلى النظام المحلي باستخدام معاملات التحويل المناسبة. أظهرت النتائج فروقات طفيفة في الإحداثيات بين الطرق المختلفة، مما يدل على دقة الطريقة الشبكية مقارنة بالطرق الأخرى.
Critical review
دراسة نقدية: تعتبر الدراسة شاملة ومفصلة في تحليل تأثير عدد مستقبلات GPS على دقة تعيين نقاط الشبكات الجيوديزية. ومع ذلك، يمكن تحسين الدراسة من خلال تضمين تحليل أعمق للعوامل البيئية التي قد تؤثر على دقة القياسات مثل التضاريس والتداخلات الجوية. كما يمكن توسيع نطاق الدراسة لتشمل مناطق جغرافية مختلفة لتعميم النتائج بشكل أفضل. بالإضافة إلى ذلك، يمكن تحسين العرض البياني للبيانات لتسهيل فهم النتائج والاستنتاجات.
Questions related to the research
  1. ما هي الطريقة الأكثر دقة في حساب إحداثيات نقاط الشبكات الجيوديزية عند استخدام ثلاثة مستقبلات GPS أو أكثر؟

    الطريقة الشبكية هي الأكثر دقة عند استخدام ثلاثة مستقبلات GPS أو أكثر.

  2. ما هي الطريقة الأفضل من حيث الدقة والموثوقية عند استخدام جهازي استقبال فقط؟

    الطريقة الشعاعية هي الأفضل من حيث الدقة والموثوقية عند استخدام جهازي استقبال فقط.

  3. ما هي العوامل التي تم أخذها في الاعتبار عند تحويل الإحداثيات من نظام GPS إلى النظام المحلي؟

    تم أخذ مصفوفة الدوران، وقيم الانزياح، ومعامل المقياس في الاعتبار عند تحويل الإحداثيات من نظام GPS إلى النظام المحلي.

  4. ما هي التوصيات التي قدمتها الدراسة لتحسين دقة الشبكات الجيوديزية باستخدام GPS؟

    توصي الدراسة باستخدام ثلاثة مستقبلات على الأقل، وإجراء القياسات على المحطات المتجاورة بشكل متزامن، واختيار نقاط الشبكة في مناطق مفتوحة بزاوية ارتفاع لا تقل عن 20 درجة.


References used
LEICK A. , GPS Satellite surveying, John Wiley & Sons, Inc, New York, 1995, 560
SEEMKOOEI ALIREZA AMIRI, Strategy For Designing Geodetic Network With High Reliability And Geometrical Strength. Journal Surveying Engineering, Vol. 127, No. 3, August, 2001, ASCE, 14
GHILANI C. D., WOLF P. R., Adjustment Computations, Fourth Edition, Jhon Wiley& Sons Inc., Hoboken, New Jersey, USA, 2006, 632
rate research

Read More

Lattakia City has faced many negative impacts of the extending crisis that Syria lives, such as defensive arrangements of most governmental facilities, and refuging millions of other Syrian cities citizens. This new situation was reflected on the tra ffic conditions on most streets and roads of city, especially on center streets. In addition it caused many traffic congestions, which led to investigate and analyze the current situation and finding traffic solutions for reducing these congestions on center streets. In this paper, the “moving observer” concept was used to measure travel time and average speed on major and minor collectors in Lattakia center. The vehicle was equipped with a GPS to collect necessary information, a number of trips was executed during daily peak period and free flow speed; then the data was processed and analyzed to generate max, min, and average speeds, constructing LOS for these streets. Study disclosed low values of LOS for some major collectors in the city, and expressed the need to take urgent arrangements to increase LOS on streets. The efficiency of “moving vehicle” concept was proved in implementing traffic studies.
The use of GPS readings has led to a real revolution in Geodesic sciences and their applications. Now, the possibility of replacing the conventional methods used in measuring elevations by using GPS technology which is a good method to get the 3D poi nts providing that the GPS measures the helical elevations. In order to measure the Physically important elevations such as the ortho-metric elevation, there must be an accurate specimen that gives the Geoids of the helix ( Geoids separation ) .In some parts of the world ( as in the case of our study ), there are only universal Ganoids .Those ganoids are calculated as series to reach a certain defined degree. The difference in the elevation ref. surfaces and the surface of the global geoids affects the optimized elevation of the GPS, but if we deal in this paper with the deviations in elevations, there will be no problem . The importance of this paper starts here , as we can get the possibility of taking the deviations in elevations by using The GPS tech that does not exceed /500m/ distance along with improving the results by using EGM2008 model. The results of the deviations in elevation taken by GPS, the Universal Geoids specimen /EGM 2008 / the direct engineering and triangular settlements, will be compared so that we reach some recommendations that increase accuracy in work and save time and efforts.
This article reviews the structure of an integrated navigation system made up of unit inertial sensors manufactured by MEMS technology, a GPS Receiver unit, magnetic compasses manufactured by MEMS technology, and a high barometric sensor. The integra ted system is built using an Extended Kalman Filter (EKF). This reviewing is performed with the use of a closed-loop system that has simple integration namely the Loosely Coupling Integration. After conducting several air tests to collect real navigational data, antipersonnel navigational data has been used to do the integrated navigation system analysis with EKF environment in the software Matlab. It has been noticed after the analysis that the complementary horizontal navigation system error does not exceed 50 m. With deliberate withholding of GPS data for different periods in order to test the performance of the integrated navigation system in case of withholding the GPS signal, we have found that the integrated navigation system achieves good accuracy, where the horizontal error does not exceed 200 m value when the withholding GPS data for 120 seconds. This can be considered as small and acceptable values compared with the horizontal error value for inertial navigation unit stim300 when operating independently of up to 8200 m.
When fine-tuning pretrained models for classification, researchers either use a generic model head or a task-specific prompt for prediction. Proponents of prompting have argued that prompts provide a method for injecting task-specific guidance, which is beneficial in low-data regimes. We aim to quantify this benefit through rigorous testing of prompts in a fair setting: comparing prompted and head-based fine-tuning in equal conditions across many tasks and data sizes. By controlling for many sources of advantage, we find that prompting does indeed provide a benefit, and that this benefit can be quantified per task. Results show that prompting is often worth 100s of data points on average across classification tasks.
Bacteriological critical control points (CCPS) for automatic ice cream industry were identified based on the primary ingradients of such industry, processing stages and working environment. Three thousand samples were analyzed during two productio n seasons. There were four critical control points in the company in which the study was conducted, Pasteurization (mix) stage, cold (tanks) stage, freezing stage, and hardning (tunnel) stage. The end-product did not coincide with the Syrian standard because of these critical control point, which contributed by 15%, 25%, 35% and 25% respectively, meanwhile the remaining pointes, such as the used water, choclate, air and workers were not critical control points under the production conditions of the investigated company.
comments
Fetching comments Fetching comments
Sign in to be able to follow your search criteria
mircosoft-partner

هل ترغب بارسال اشعارات عن اخر التحديثات في شمرا-اكاديميا