GPS time info @ 2 Hz?

nes9966

Hello,
Per livox_ros_driver, the output frequency of GPRMC/GNRMC time information of GPS shoulf be set to 1Hz.
After review, my GPS signal is at 2Hz.  What issues will this cause? and can topic be modified?

Livox Support

If according to the specifications of the livox ros driver, the output frequency of GPS GPRMC/GNRMC time information should be set to 1Hz, but your GPS signal is actually 2Hz, it may cause the following problems:

1. Data inaccuracy: Due to the ROS driver expecting to receive time information once per second, but GPS sends time information twice per second, it may lead to data inaccuracy. This may cause issues with the timing processing and data parsing of your application.

2. Data loss: ROS drivers may only process the first time information per second and ignore the second time information. This may result in the loss of the second time information, leading to inaccurate timestamp calculation of GPS signals by your application.

3. Frequency mismatch: If the application relies on 1Hz time information and assumes that the data arrives at 1Hz frequency, it may cause a mismatch between the data and the expected frequency of the application at 2Hz, which may affect data processing and analysis.

The question of whether the theme can be modified depends on the capabilities of the GPS device and driver you are using. Some GPS devices may allow users to modify the output frequency through configuration, but others may not be able to change the frequency. Therefore, if your device supports frequency modification, you can try adjusting it to 1Hz to meet the requirements of the livox ros driver. Otherwise, you may need to consider using other GPS devices that are compatible with a 1Hz output frequency to avoid potential issues.

nes9966

It looks like I will need to consider a different device.  Per the manufacturer, it only outputs at 2 Hz.
Thank you for your response.