FRONT-END PROCESSING FOR MONOPULSE DOPPLER RADAR

FEPMR is standing for Front-End and Doppler Processing for Monopulse Doppler Radar. It is a PCB at the frontier between the RF and the Digital Circuits for the radar AXIR. There are four channels, corresponding to the four squinted beams of the antenna (Right, Left, Up and Down). Each beam channel is processed in phase (I) and quadrature (Q) real baseband signals.

The eight video analog signals are amplified and then converted by 8 ADC (Analog to Digital Converters). Four Texas Instruments (TI(TM)) TMS320C50 dgital signal processors (DSPs) (one for each beam channel) are operating two major algorithms in cascade.

- A flexible FIR (Finite Impulse Response) Digital Filter with complex coefficients is first applied as a Digital Pulse Compressor to provide 16 range bins. AXIR transmitter is using a quadriphase sequence (1 up to 31 sub-pulses). Coefficients for the reference code are optimised by the Radar Manager (project C) to reduce the range side lobes.

- The second part implements three IIR (Infinite Impulse Response) Digital Filters, using also complex coefficients as a Doppler filter. These coefficients are dynamically computed by the Radar Manager (project C) as a function of the tracked target range and Doppler. An output time decimation is provided in accordance with the coherent and non-coherent integration process.

This document was an entry in the 1995 DSP Solutions Challenge, an annual contest organized by TI to encourage students from around the world to find innovative ways to use DSPs. For more information on the TI DSP Solutions Challenge, see TI's World Wide Web site at www.ti.com.

*DISCLAIMER: This document was part of the DSP Solution Challenge 1995 European Team Papers. It may have been written by someone whose native language is not English. TI assumes no liability for the quality of writing and/or the accuracy of the information contained herein.

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