# How is pseudorange calculated?

## How is pseudorange calculated?

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.

## What is pseudorange measurements?

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. Ranges with the same error are called pseudoranges.

What is the difference between pseudorange and carrier phase?

Carrier phase measurements are similar to pseudorange in that they are the difference in phase between the transmitting and receiving oscillators. Integration of the oscillator frequency gives the clock time. The rate of change of phase is frequency. Notice that the phase difference changes as ρ/c changes.

What is pseudorange residual?

Pseudorange residuals are defined as the difference between the estimated range to the satellites and the measured pseudoranges. These residuals contain enough information to provide real-time integrity monitoring of the accuracy of the navigation solution.

### What is the difference between range and pseudorange?

Range (sometimes referred to as true range) is an instantaneous measurement of the distance between the transmit antenna on the SV and receive antenna on the vehicle. Pseudorange is the range that a GNSS receiver measures between the transmit antenna on the SV and its’ receive antenna.

### What is the precision of the pseudorange?

The GPS P2 code pseudorange precisions for Trimble and ComNav are 0.1545 and 0.1027 m, respectively. The precision is nearly the same or lower than that of the C/A code.

What is pseudorange with equations?

Pseudorange. This measurement D= c\Delta 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.

What are the different factors that may cause pseudorange measurement error?

The user’s clock bias is a time-varying term that affects all pseudoranges and is caused by the following factors: Local oscillator drift and bias. Satellite payload filter (analog and digital) propagation delays. Antenna and receiver propagation/processing delays.

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