WHAT WE OFFER


  • s4.jpg
  • s9iiipluss4_-photo1.png
  • s10_photo_01.png
  • s7.png
  • T2_T3_front_img.png

GPS

GPS stands for Global Positioning System , based on Satellite navigation technology. The fundamental techniques of GPS is to measure the ranges between the receiver on land, at sea, in air /space and a few simultaneously observed satellites in space. It was developed by the US DOD under its NAVSTAR satellite program to accurately determine user’s position, velocity and time in a common reference system anywhere and or near the earth on a continuous basis. Through the developments of a few decades, GPS is widely welcomed in many areas, such as navigation, low earth orbit satellite determination, static and kinematic positioning, surveying etc. GPS becomes a necessity for daily life, industry , research and Education. The most important applications are positioning and navigation. It is all weather , space-based navigation system. It includes three major parts:  The space segment consisting of satellites, which broadcast signals; The Control segment steering the whole system, the user segment including the many types of receivers.


APPLICATION INCLUDES:

01.

Geodetic survey, Direct geo referencing for Photogrammetry, Lidar survey, Land survey,  Location of controls for Geographic databases,  Topographic, Route and Construction Surveys, Deformation monitoring,  


02.

​General Purpose Handheld for attitude determination, Aviation, Automobile Navigation, IVHS and Fleet location, Mapping and data collection, Marine, OEM, Space, Timing.

ON-SITE SERVICES

CONTACT US FOR A FREE CONSULTATION.


Typical GPS Observation Methods and required Accuracy

 1 Conventional Static Positioning

It has two or more receiver at two or more stations, simultaneously receive signals from a minimum of four satellites.  Baseline accuracy 5mm+1PPM when base line less than 25 KM using single frequency receiver. Relative long time occupation are needed. Bigger than 15 minutes, 30minutes for dual frequency receivers and single frequency receivers. Improve accuracy by increasing the observation time and not use satellite at low elevation angles(e.g. ) 15 degrees)

2 Rapid Static Positioning

Rapid Static Positioning is an extension of the above conventional static positioning to achieve cm-level accuracies in minutes. It includes one or more receivers at the reference stations but remain fixed during the observation period. One or more receivers that occupy rover stations.

Baseline accuracy 5mm+1PPM when base line is less than 25 KM(less than 10KM for L1 only). Relative short time occupation are needed. 3-5 minutes up to 20  minutes at rover station. Do not use satellite at low elevation angles(e.g. ) 15 degrees.


3 Kinematic Positioning

Kinematic Positioning is a productive and accurate method to establish relative survey control. It includes one or more receivers at the reference stations but remain fixed during the observation period. One or more receivers are rovers and move together with moving objects without signal interruption during observation(stay minutes at the start point).

Accuracy is 1-2 cm, 1ppm.  Short distance is less than 30 km, data rate is at 1-200 Hz.

4 Stop and Go Positioning

Stop and Go Positioning is a quick method for detail surveying, engineering surveying. .It includes one or more receivers at the reference stations but remain fixed during the observation period. One mobile receiver that first occupies that first point for several minutes in order to get a better positioning initialization, then moves from one to the other point for several epochs up to minutes occupation without signal interruption. Its accuracy is 1-2 cm, 1ppm.  Short distance applies.

5 Reoccupation

It includes one or more receivers at the reference stations but remain fixed during the observation period.  One or more mobile receiver occupy points of interest for several minutes for a change of satellite configuration without signal interruption.  Reoccupy the same points in time.

Accuracy is 5-10mm, 1ppm.Short distance applies.

6 Pseudo-Kinematic Positioning

It is the combination of Stop and Go and Reoccupation method.  It observes points for a few minutes(turn off during travel between points). Re-observe the same points under a different satellite geometry, use combined observations to resolve positions and ambiguities.

COMPLETE GPS AND POSITIONING PRODUCT

LIDAR DATA WITH LESS THAN 15 CM ACCURACY, CAMERA GSD 3CM.


STONEX PRODUCT OVERVIEW

DONEC IN VELIT VEL IPSUM AUCTOR PULVINAR

Please review this video for S10A features. 

CONSULTANCY AND ONSITE SERVICES


POWERLINE SURVEY

TRANSPORTATION

FOREST

DATA PROCESSING