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DCA1000EVM: The "Codes" label in raw data is read from the DCA1000EVM by an Ethernet port

Tuan Trinh
Prodigy 135 points
Part Number: DCA1000EVM
Hi TI Customer Support, 
I have a question about the label in raw data that is read from the DCA1000EVM by an Ethernet port.
I built a user app in Python programming to capture raw data from an AWR1243BOOT using a DCA1000EVM capture card by Ethernet port. I collected successful raw data but I do not understand what the "Codes" unit of raw data is in the y-axis in the below figure. 
(The figure below shows the raw data received from Chirp 1 of the RX1 antenna).
Regards,
BlushBlushBlush
Tuan Trinh The
  • +1
    TI__Expert 3171 points

    Hello Tuan,

    Maybe easiest to understand by thinking about how the radar works:  a frequency chirp is sent at a certain power, and then reflected back.  The reflected back signal is mixed at the receiver with the chirp being generated on the device, resulting in a fixed frequency tone for a stationary reflector, at a certain power (i.e. amplitude).  This tone is sampled by the ADC on the device.  The larger the reflection, the larger the mixed-down tone will be in amplitude, and hence the ADC-sampled version of this tone will occupy higher codes.  

    Regards,

    James