Simple PDW Pipeline

This is a Holoscan pipeline that shows the possibility of using Holoscan as a Pulse Description Word (PDW) generator. This is a process that takes in IQ samples (signals represented using time-series complex numbers) and picks out peaks in the signal that may be transmissions from another source. These PDW processors are used to see what is transmitting in your area, be they radio towers or radars.

siggen.c a signal generator written in C that will transmit the input to this pipeline.

BasicNetworkOpRx

This uses the Basic Network Operator to read udp packets this operator is documented elsewhere.

PacketToTensorOp

This converts the bytes from the Basic Network Operator into the packets used in the rest of the pipeline. The format of the incoming packets is a 16-bit id followed by 8192 IQ samples each sample has the following format: 16 bits (I) 16 bits (Q)

FFTOp

Does what it says on the tin. Takes an FFT of the input data. Also shifts data so that 0 Hz is centered.

ThresholdingOp:

Detects samples over a threshold and then packetizes the runs of samples that are above the threshold as a “pulse”.

PulseDescriptiorOp

Takes simple statistics of input pulses. This is where I am most excited for future work, but that is not the point of this particular project.

PulsePrinterOp

Prints the pulse to screen. Also optionally sends packets to a BasicNetworkOpTx. The transmitted network packets have the following format: Each of the following fields are 16bit unsigned integers id low bin high bin zero bin sum power max amplitude average amplitude