The Javad´s receiver in simulation environment

puchy999

New Member
Our purpose is to calibrate the Javad receiver.
We have the GNSS receivers that use Javad chip inside. We don't know the Javad chip series inside receiver because the original prohibits us to open them.
Our Javad receivers can receive GPS L1/L2, GLONASS.
We would like to test them in lab by simulating the signal with vector signal generator. The signal of simulation can be easily acquired by ordinary handheld Garmin .
While the Javad only viewed but not acquired or locked the satellites. The Javad still works well in all conditions except in simulation lab.
If someone in this forum faced the problem like us, please let us know about the requirement of Javad´s receiver chip. The difference between the ordinary handheld GPS receiver and Javad receiver which we can config the vector signal generator to send the proper signal that Javad receiver can acquire not only view.

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Thanks
 

Sergei Yudanov

New Member
JAVAD GNSS
Requirement is easy - all characteristics of simulated signal should be like original live signal has. To find, what is wrong with simulated signal, it is required to enable various debugging information. This can be done only in Javad lab.

Maybe receiver remembers some info from live sky tracking? Please clear NVRAM before connecting to simulator.
 

puchy999

New Member
Requirement is easy - all characteristics of simulated signal should be like original live signal has. To find, what is wrong with simulated signal, it is required to enable various debugging information. This can be done only in Javad lab.

Maybe receiver remembers some info from live sky tracking? Please clear NVRAM before connecting to simulator.
Thank you. We will try to do as your suggestion.
 

Bryan Enfinger

Active Member
Wow cool equipment ! I remember late 70's when my dad used oscillator scope debugging boards on our 2 PDS 1020 computers we used for survey computations. He had bought both machines at end of life with full set of extra boards for both machines. The machines were very sensitive to overall office temps. I remember when using them, you really had to monitor board temps if using for any length of time. You could punch in command for board temps. I usually did this every 30 min. for checks of temp. Keyboard, paper punch roll for program loading and output for saving data, IBM typewriter also for output of data. The machines were about the size of an average desk. I really enjoyed learning surveying computations and coding on them. Cool machines for the era before PC's.
 
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