Post Processed Kinematic Survey Method | Working, Features, Advantages & Disadvantages of PPK

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In this article, we will discuss post processed kinematic.


  1. Introduction  

Post processed kinematic (PPK) may be defined as a GPS correction that is utilized in surveying to correct the location data after it is gathered and posted.

Real-time kinematic (RTK) is similar technology of GPS correction as same as PPK but works real-time corrections to the data and images. PPK method is mostly utilized in drone mapping and land surveying.

PPK techniques successfully collect approximate location information as another method for traditional methods, i.e., ground control points (GCP).

This article discusses the working and advantages of PPK surveying in the construction industry.


Post processed kinematic


  2. Working of PPK Surveying  

For performing, PPK surveying needs at least two Global Navigation Satellite System (GNSS) receiver units to attain cm-level precision of computation. One unit is unchanged, which is the reference receiver called the “base,” and the other is a moving receiver called the “rover.” In this method, more than one receiver can be utilized for this survey.

During the performance, the base station and the rover units record raw GNSS data. This raw data includes all measurements without any computation. While performing so, there is no requirement for a good and stable connection between the rover and the base station.

The data gathered is stored in the survey controller or recipient until the fieldwork is done. This data is processed with the help of utilizing software, and the corrections are given to the data.

In modern drone mapping technologies, PPK auto-adjusted drones are utilized, which work as PPK receivers. With the use of PPK, these drones click many geotagged pictures of the areas over several passes.


  3. Features of PPK Surveying  

The features of Post Processed Kinematic are as follows:

a. As there is no need to have a connection between the rover and the base station.

2. This method is best for survey areas with obstructions like trees, buildings, etc.

b. Post Processed Kinematic surveys are utilized for mapping or surveying the points where many centimeters of precision are needed.

c. Post Processed Kinematic surveying decreases the requirement for ground control points (GCP), reducing field preparation time.

d. In PPK, the rover moves and gathers the location coordinates without any problem related to its connection with the base station. Hence, the technique permits having longer baselines of up to 100 km.


  4. Advantages of PPK Surveys  

Here are a few advantages of Post Processed Kinematic are as follows:

a. PPK data recording time at the site is quicker than RTK’s real-time recording because main calculations and error corrections are performed post-survey.

b. The PPK system does not require the surveying team to maintain the connection between the base station and rovers.

c. It is more flexible and can be employed in more challenging environments.

d. Even though the PPK survey is performed quickly, it demands more time to post the data and implement GPS corrections.


  5. Disadvantages of PPK Surveys  

Here are a few disadvantages of Post Processed Kinematic are as follows:

a. Post-processed kinematic drones are kept to Beyond Visual Line of Sight (BVLOS) activities.
b. If signals are lost, then it can result in a loss of correction data with the potential for inaccurate gaps during the flight.
Read Also: Photogrammetry
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