Deluo TRISTAR25 Manuel D’Utilisation

 

 

 

29

 

 

 

In applications where the GPS receiver reported position, velocity, and time needs to be 

logged, the TISTAR25 supports logging capability directly by storing the data in the on-board 

memory. The logged data may be retrieved later. 

 

The logged information consists of: 

 

! 

GPS time (WNO, TOW), with 1 second resolution. 

! 

Position in ECEF coordinate, with 1 meter resolution. 

! 

Velocity, with 1 meter/sec resolution. 

! 

Navigation mode (2D, 3D). 

! 

DGPS used indicator 

 

All data logging commands and each logged data output is sent with message header, 

message body, and message footer protocol as described in section 4.2.   

 

The TISTAR25 can log up to 5000 sets of data.     

 

 

 
4.3.1.1 LogConfig Set   

 

This command configures the logging function.   

 

1 

Message ID = 0x81   

Unsigned byte 

 

2 

Command 

LogConfig = 0x10 

Unsigned byte 

 

3 ~ 4  Configuration 

 

Unsigned 16bit integer 

 

5 ~ 6  delta_Tmin 

0 ~ 65535 

Unsigned 16bit integer 

sec 

7 ~ 8  delta_Tmax 

0 ~ 65535 

Unsigned 16bit integer 

sec 

9 ~ 10  delta_D 

0 ~ 65535 

Unsigned 16bit integer 

meter 

 

The data logging function stores receiver position, velocity, time and status information 

according to the following algorithm:   

 
delta_Tmin : Time interval to check if data logging is required; must be > 0. 
delta_Tmax : Maximum time interval beyond which data must be logged. 
delta_D : Maximum distance beyond which data must be logged. 
 
distance = current_position – last_logged_position 
elapsed_time = current_time – last_logged_time 
if ((elapsed_time < (delta_Tmin - 1)) or (delta_Tmin == 0)) return and do not record PVT data 
if ( ((elapsed_time > (delta_Tmax - 1)) and (delta_Tmax > 0)) 
      or ((distance > (delta_D - 1)) and (delta_D > 0) )) record PVT data