Determination of the absolute position (absolute positioning) is a method of positioning the most basic of GPS was originally planned by the U.S. military to provide navigation services, especially for military personnel and their vehicles. This positioning method, the static and kinematic mode,
With regard to absolute positioning, there are few records to note are:
With regard to absolute positioning, there are few records to note are:
• This method is sometimes also called point positioning method, because positioning can be performed per point without relying on other points
• The position is determined in WGS-84 system to the mass of the earth pust
• To determine the position of the GPS receiver requires only sister, and types of receivers commonly used for this purpose is the type of navigation or sometimes called a type of handheld (hand held).
• Points can be defined its position at rest (static mode) or in motion (kinematic mode),
• Accuracy of position obtained is very dependent on the level of data accuracy and geometry of the satellite.
• Main application of this method is for navigation purposes or other applications that require positioning information that is not too rigorous but available in an instant (real time), such as for purposes of reconnaissance and ground truthing.
• The position is determined in WGS-84 system to the mass of the earth pust
• To determine the position of the GPS receiver requires only sister, and types of receivers commonly used for this purpose is the type of navigation or sometimes called a type of handheld (hand held).
• Points can be defined its position at rest (static mode) or in motion (kinematic mode),
• Accuracy of position obtained is very dependent on the level of data accuracy and geometry of the satellite.
• Main application of this method is for navigation purposes or other applications that require positioning information that is not too rigorous but available in an instant (real time), such as for purposes of reconnaissance and ground truthing.
Determination Method of the absolute position using pseudorange data on the basic principle is a method designed for determination by the management of GPS satellites (DoD, United States). In this case there are two levels of accuracy provided by GPS, which is called SPS (Standard Positioning Service) and PPS (Precise Positioning Service).
SPS is the standard of service provided by GPS in general to anyone at no charge, assuming the use of code-C / A. Given level of accuracy is the precision arrives been deliberately reduced by applying the wisdom of Selective Availability (SA). Typical position accuracy level given in this case is about 100 m (horizontal) with 95% confidence level. While PPS is dikhusukan service to the United States military as well as parties are permitted, through the use of P-code contained on 2 frekuens, L1 and L2. Besides, this PPS also has characteristics of anti-jamming (stronger signal), anti-spoofing, and free from the influence of SA. Given level of accuracy in this case is approximately 21 m (horizontal) with 95% accuracy level.
The level of accuracy can be dramatically improved by using differential positioning method (differential positioning) and also the phase of observation data.
In determining the absolute position on a epok using pseudorange, there are four parameters that must be determined / estimated as follows: • The parameter coordinates (X, Y, Z) • GPS receiver clock error parameter.
Therefore, to determine the absolute position on a epok using pseudorange data required minimum distance of four observation satellites fruit.
Accuracy parameter = DOP x Accuracy pseudorange
In the relationship above, DOP (dilution of precision) is a number that is used to reflect the power of a strong satellite geometry (both), and a great price DOP indicates poor satellite geometry (bad). Based on the estimated parameters, known for several types of DOP, namely:
GDOP = Geometrical DOP (position and wakktu-3D),
PDOP = Positional DOP (position-3D),
HDOP = Horizontal DOP (horizontal position),
VDOP = Vertical DOP (height), and
TDOP = Time DOP (time).
SPS is the standard of service provided by GPS in general to anyone at no charge, assuming the use of code-C / A. Given level of accuracy is the precision arrives been deliberately reduced by applying the wisdom of Selective Availability (SA). Typical position accuracy level given in this case is about 100 m (horizontal) with 95% confidence level. While PPS is dikhusukan service to the United States military as well as parties are permitted, through the use of P-code contained on 2 frekuens, L1 and L2. Besides, this PPS also has characteristics of anti-jamming (stronger signal), anti-spoofing, and free from the influence of SA. Given level of accuracy in this case is approximately 21 m (horizontal) with 95% accuracy level.
The level of accuracy can be dramatically improved by using differential positioning method (differential positioning) and also the phase of observation data.
In determining the absolute position on a epok using pseudorange, there are four parameters that must be determined / estimated as follows: • The parameter coordinates (X, Y, Z) • GPS receiver clock error parameter.
Therefore, to determine the absolute position on a epok using pseudorange data required minimum distance of four observation satellites fruit.
Accuracy parameter = DOP x Accuracy pseudorange
In the relationship above, DOP (dilution of precision) is a number that is used to reflect the power of a strong satellite geometry (both), and a great price DOP indicates poor satellite geometry (bad). Based on the estimated parameters, known for several types of DOP, namely:
GDOP = Geometrical DOP (position and wakktu-3D),
PDOP = Positional DOP (position-3D),
HDOP = Horizontal DOP (horizontal position),
VDOP = Vertical DOP (height), and
TDOP = Time DOP (time).
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