Static observation (1)

Static observation is a commonly used method in geographical surveying and navigation for accurately measuring the coordinates of points. In static observation, a receiver remains stationary at the observation point and collects satellite signal data over a period of time. These satellite signals contain navigation information transmitted by satellites, and by analyzing these signals, the coordinates of the receiver's location can be calculated. Static observation typically requires a longer observation time to enhance measurement accuracy.

The advantage of static observation is its ability to achieve relatively high precision, but the trade-off is the longer observation time required and the need to ensure the stability of the receiver's position during the observation period.

Sites for static should be chosen for their suitability for observations. A good site should have the following characteristics:

A network consists of a set of baselines between network points. The design of the network will affect the results that are obtained from the survey. The following principles are recommended for good network design:

➣ One receiver, the base receiver, is set up over a known point. The other receiver, the rover receiver, is set up over a point whose coordinates are unknown. They collect simultaneous observations at both the base and rover receivers for a certain period of time.

 

 

➣ Two receiver, the base receiver, is set up over a known point. The other receiver, the rover receiver, is set up over a point whose coordinates are unknown. When first unknown point is finish, not remove the base receiver and move the rover receiver to other unknown point.

 

 

➣ One receiver, the base receiver, is set up over a known point. It keeps continuous observation. The other receiver, the rover receiver, is set up over a point whose coordinates are unknown. They collect the observations in unknown point one by one around the base. In this way, it is more efficient, however the network geometry and reliability is poor and precision is not high.

 

Recommended observation time

The recommended synchronization observation time as below. For the PPK base station, the sample interval must set as 1s.

 

Baseline Distance (km)	Approximate Time	Elevation Mask Angle (degree)	Sample Interval (s)
> 50	≥ 4 h	15	10-30
> 30	≥ 2-3h	15	5-15
> 15	≥ 1-2 h	15	5-15
> 5	≥ 30 min	15	1-30

Above are the steps of how to do static observation. In the next blog, we will introduce the methods of SinoGNSS K8 receivers to manage static parameters.