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