Differential Global Positioning System (DGPS)
Differential Global Positioning System (DGPS) uses a network of fixed, ground-based reference stations to broadcast the difference between positions indicated by satellite systems and known fixed positions.
Differential Global Navigation Satellite Service (DGNSS)
DGNSS is the internationally accepted means of providing differential GNSS (DGPS at present) corrections and integrity information to maritime users. DGNSS technology has been developed and deployed worldwide and is able to support multiple GNSS systems such as GPS, and GLONASS.
Precise Point Positioning (PPP)
Precise Point Positioning (PPP) is a method that performs precise position determination using a single GPS receiver. This positioning approach arose from the advent of widely available precise GPS orbit and clock data products with centimetre accuracy. The data can be applied to substantially reduce the errors in GPS satellite orbits and clocks, two of the most significant error sources in GPS positioning. PPP is able to provide positioning solutions at centimetre to decimetre level and uses highly precise satellite clock estimates.
Precise Satellite Positioning
A procedure by which satellites are used to locate precise objects or particular points on Earth. VERIPOS specialises in providing the most robust data broadcast services for precise navigation and positioning applications. Our range of satellite reception hardware is designed and manufactured to highest specifications, and includes L-band satellite demodulators, GNSS receivers to track both the GPS and GLONASS satellite constellations plus associated antenna hardware.
Positioning Augmentation Data
Augmentation data relates to satellite navigation signals. VERIPOS software can be configured to any user’s operational needs, and supports all VERIPOS data augmentation services and a wide range of GNSS receivers.
Differential GLONASS Positioning
GLONASS is a Russian Global Navigation Satellite System (Global’aya Navigatsionnaya Sputnikovaya Sistema). The operation of this system is similar to GPS. VERIPOS GLONASS is designed to increase the availability of GNSS observations during periods of local masking, ionospheric scintillation or poor GPS geometry.
Satellite Orbit and Clock Determination System
VERIPOS operates its own satellite orbit and clock determination system (OCDS) which derives real-time corrections for all satellites in the GPS constellation using proprietary algorithms.
Dynamic Positioning (DP) – Position Reference Sensor
Dynamic positioning (DP) is a computer controlled system which automatically maintains a vessel's position and heading by using the propellers and thrusters. Position reference sensors, combined with wind sensors, motion sensors and gyro compasses, provide information to the computer pertaining to the vessel's position and the magnitude and direction of environmental forces affecting its position.
Dynamic Positioning (DP) – DGPS
Differential Global Positioning System (DGPS) is an enhancement to the Global Positioning System that uses a network of fixed, ground-based reference stations to broadcast the difference between the positions indicated by the satellite systems and the known fixed positions. The service consists of four key elements: a Reference Station Network, a Data Transfer Network, a Network Control Centre (NCC) and the user's equipment.
Satellite Augmentation Service
A system that transmits range corrections from orbiting satellites instead of ground-based. Such systems are commonly composed of multiple ground stations, located at accurately-surveyed points. The ground stations take measurements of one or more of the GNSS satellites, the satellite signals, or other environmental factors which may impact the signal received by the users. Using these measurements, information messages are created and sent to one or more satellites for broadcast to the end users. Through the use of these Augmentation Systems an individual GPS receiver is able to correct its own position, offering a much greater accuracy. Typically GPS signal accuracy is improved from some 20 meters to approximately 1.5–2 meters in both the horizontal and vertical dimensions.
This encrypted Commercial Service (CS) will be available for a fee and will offer an accuracy of better than 1m. The CS can also be complemented by ground stations to bring the accuracy down to less than 10cm. This signal will be broadcast in three frequency bands, the two used for the OS signals, as well as at 1260–1300 MHz.