PFB (Polyphase Filter Bank) Test

Purpose

This test verifies the operation of the polyphase filter bank firmware by generating a specific ADC data pattern and verifying the channelized data output against a predefined filter response. The software requests the LMC data type “channelised data”, and captures this using the DAQ receiver.

NOTE: This test only operates on the first TPM in a station.

NOTE: For data acquisition to function correctly, the network interfaces on the TPM must be working, as well as the link to the LMC destination. The LMC destination must be configured to route traffic to the server running the tests. For all tests the simplest option is for the CSP and LMC destinations to be the same network interface, routing all traffic to the server running the tests.

Methodology

  1. DAQ receiver is configured and initialised with the required UDP port and network interface.

  2. Start JESD test pattern generator with predefined data pattern

  3. An LMC snapshot of channelised data is requested from the TPM

  4. For each antenna, channel and polarisation, the amplitude in the course channel is compared to an expected value, calculated from the predefined filter response for the 16 tap filter.