EZField - How to use the Semi-kinematic mode

The semi-kinematic mode allows to perform surveys that are productive, reliable and accurate to the centimeter. Semi-kin insures 3D post-processed centimeter accuracy with roving L1 receivers. In semi-kinematic, EZField monitors the signal quality and manages the required initialization procedures (initialization is required to secure post-processed centimeter accuracy with L1 receivers).

At any time, when recording a file, you can access the List tab to view the recorded features and their status (Closed or Opened).

You can filter the table displayed with the drop-down list .

 

When you select an object from the table you can:

 Open it

a. Open a site to modify its name or code.

b. Open a line or polygon to complete it.

 Navigate to it (refer to How to navigate article for more details).

 Delete it.

To record a Site:

 Enter a Site number. You can define an Auto Increment value with File > Preferences > Kinematic.

 If desired, you can enter a Code (Pcode) for the site.

 Enter the Antenna Height (Ant.H.) if different from the one proposed (Ant. H. entered for the file is proposed).

 You can define a Duration in terms of Epochs or Seconds (use the & Up option to record the minimum Duration you’ve set and, if the user stays longer at the site, all additional epochs/seconds will be used when you process the site).

 Sites recorded with a duration of 20 seconds or more can be used as known sites for a quick (20 seconds) re-initialization whenever a Loss of lock alarm happens.

 Click on the Start Recording button to record a point.

 To save the site, click on Commit. You can set the Auto Commit option with File > Preferences > Kinematic to save automatically the site once the set duration has been reached.

To record a line or a polygon:

 Select if you want to record a Line or a Polygon.

 Select if you want it to be Continuous (vertices are added automatically according to the file data interval) or Discrete (vertices are added manually with the Add Vertex button). At any time, when recording a line or a polygon, you can switch it from Continuous to Discrete and vice versa.

 Enter a Name for your line or polygon.

 If desired, you can enter a Code.

 Click the Start button to start recording the line or polygon.

 Click the Pause (or Resume) button to pause the line or polygon.

 Click the Add Vertex button to add vertices into your line or polygon. You can define a duration for manually added vertices with File > Preferences > Kinematic.

 Click the Stop button (when a line or polygon is started, the Start button changes for Stop) to stop recording the line or polygon.

Once initialized, you can record sites (points), lines and polygons.

 

The post-processed accuracy (X, Y, H)  will be at a centimeter level until a Loss of Lock happens.

 

If a Loss of Lock happens, you will need to reinitialize to maintain centimeter post-processed accuracy. If a Loss of Lock alarm happens, EZField will bring back the Init tab so you can re-initialize.

It gives you a choice between 3 modes of initialization:  

 Set your rover antenna on a known site (point) for 20 seconds;

 Fix your rover antenna on the EZBar for 2 minutes.

An EZBar allows to separate the base antenna center and the Rover antenna center at a distance of exactly 20 cm.

 Set your rover antenna on an unknown site for 15 minutes (the required time to establish its precise coordinates)

 

Using the drop-down menu, select the initialization Mode of your choice and place your Rover antenna over the site or on the EZBar.

EZBar mounted at the base site (must be exactly 20 cm)

According to the mode of initialization selected, some information may need to be entered.

 

Click on Initialize Now… to start the initialization. You can use the Auto Commit option found in File > Preferences > Kinematic to save automatically the site once the initialization is completed.

 

As explained above, once initialized, you can record sites, lines and polygons.

The Site tab allows you to record sites while the Line tab allows to record lines or polygons.

To start the Semi-kinematic mode, click on the Semi-kin icon.

You can set configurations specific to the mode of operation, refer to the article called Configure Alarms for more details. To secure centimeter accuracy in post-processing, it is highly recommended to set the Loss of Lock Alarm at 5, the PDOP alarm at 6 and the mask angle at 15.

The Settings tab allows to configure the survey file.

 You can name the File or use the default file name proposed (for details, refer to Automatic file naming convention and Automatic file naming for multiple field crew articles).

 Define the data rate (the recording Interval).

 Enter the Antenna Height (Ant.H.), normally it is the rod height.

When you are ready to start recording your file, click on .  It will be stored into the folder My Documents/Effigis/EZField/Surveys.

The first step in semi-kinematic mode is to initialize the survey. Therefore, the Init tab is brought up.

At any time, when recording a file, you can access the Monitor tab.

 

The Monitor tab give the following information:

 The Start time.

 The number of Epochs recorded.

 Cycle slips, if any (LL: Loss of lock observed so far).

 The satellite code (PRN) along with the number of epochs recorded. The Cont. row shows the number of consecutive epochs without cycle slip for each observed satellites while the Total row shows the total number of epochs recorded for every observed satellite.

 The Elapsed time since the file has been started.

When you finished your survey and want to stop it, click on .

When the file has been stopped, you can go back to the main menu (operation modes) by clicking on .

Article: 000091

Related Products: EZField

Last Update: 2017-11-06 19:50:42

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