What is the difference between range and pseudorange (pseudo range) in GNSS applications? (2024)

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What is the difference between range and pseudorange (pseudo range) in GNSS applications? ›

Pseudorange is the range that a GNSS receiver measures between the transmit antenna on the SV and its' receive antenna. It differs from the true range due to many physical effects. (Please refer to FAQ11129 for a complete list of effects that are considered when calculating changes in the pseudorange).

The pseudorange is an approximation of the distance between a satellite and a GNSS receiver. A GNSS receiver will attempt to measure the ranges of (at least) four satellites as well as their positions when their positional data were transmitted.

The code pseudorange measurement provides an approximate range estimate between the receiver and the satellite, and can easily be used for a positioning solution through trilateration. On the contrary, carrier phase measurement is far more difficult to implement desp...

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Code pseudo range positioning works on the simple idea that each GNSS receiver has a copy of the codes each satellite transmits (remember that each satellite, apart from GLONASS, have unique codes) and that the receiver can compare the code it receives with the code it has on board to determine the difference between ...

If it were possible imagine a tape measure stretched out between the two antennas, this measurement is the true range. Pseudorange is the range that a GNSS receiver measures between the transmit antenna on the SV and its' receive antenna. It differs from the true range due to many physical effects.

These pseudoranges and pseudorates are used to calculate the GPS receiver position and velocity, which are introduced to the estimation process. Since pseudo-GPS measurements are used, any GPS satellite can be chosen from the GPS constellation.

This measurement D = c Δ T is what we know as pseudorange or pseudodistance and it is an "apparent range" between the satellite and the receiver that does not match with its geometric distance due to, among other factors, synchronism errors between receiver and satellite clocks.

Pseudorange and delta-range are the basic measurements that a GPS receiver provides in an integrated GPS/inertial system. Usually the delta-range measurement is treated as an instantaneous velocity measurement in the Kalman filter integration of the two systems.

It represents a measurement of the distance between emitter and receptor given in cycle units of the carrier frequency. So, the observable is obtained by shifting the generated signal carrier phase to match it with the received carrier phase from the satellite.

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Unlike true range, which would account for the exact distance without any distortions, pseudorange includes various errors such as signal delays in the ionosphere and troposphere, and inaccuracies in the receiver's clock. This makes it a 'pseudo', or false, measure of range, hence the name pseudorange.

The pseudoranges of each satellite are obtained by multiplying the speed of light by the time the signal has taken from the satellite to the receiver. As there are accuracy errors in the time measured, the term pseudo-ranges is used rather than ranges for such distances.

GLONASS (Global Navigation Satellite System), Russia.

A pseudometric (aka. pseudo-distance) is a metric except that maybe x≠y but d(x,y)=0.

The first pseudo-random code is called the C/A (Coarse Acquisition) code. It modulates the L1 carrier. It repeats every 1023 bits and modulates at a 1MHz rate. Each satellite has a unique pseudo-random code. The C/A code is the basis for civilian GPS use.

Pseudo ranging uses time parameter as its main constituent. 3. Which is the main parameter used in pseudo ranging? Explanation: The position of an object in GPS using pseudo ranging can be done by the calculation time of travel of the signal.