1995 TI DSP Solutions Challenge Regional Winners

Territory II (European Division)

• Western Europe
• Eastern Europe
• Eastern Med./Africa/Mid East

Western Europe

Entry Topic: 		"Front-End Processing for Monopulse 
			   Doppler Radar"
University: 		Ecole Francaise d’Electronique et d’ 
			   Informatique (EFREI)
Team Members: 		Pierre-Henry Dezaux, Undergraduate
			Xavier Gilles, Undergraduate
			Sylvain Marques, Undergraduate
Advising Professor: 	Dr. Louis M. Fourdan, Professor

Abstract

Front-End and Doppler Processing for Monopulse Doppler Radar (FEPMR) 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 A/D converters. Four TMS320C50 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 optimized by the Radar Manager (project C) to reduce the range side lobes.

• The second part implements three IIR (Infinite Impulse Response) Digital Filters, also using 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 project is implemented on a Printed Circuit Board (PCB), using four TMS320C50s. In the near future, a single TMS320C82 could probably do the same job within the same real-time specifications because of its improvements.

Eastern Europe

Entry Topic: 		"Audioprocessor for Automobile"
University: 		Tampere Institute of Technology
Team Members: 		Tero Piispala, Undergraduate
Advising Professor: 	Mauri Inha, Senior Lecturer

Abstract

The design for the automobile audioprocessor is based on the TI TMS32OC50. By using this equipment, it is possible to produce an artificial sense of space for listening to music in a car. The special aspects in the car and in the music are considered and reviewed, and on that basis, equipment can be designed.

The user interface software and signal processing software was designed and implemented. The main purpose was to use the equipment for research and development work. PCB for prototype was designed by PADS-software.

The purpose of the designed equipment is to impress an artificial sense of space which will improve listening music in automobile. This will happen by constructing from two of stereo channel four different signals. The signals are delayed in the time domain and there will be added echo which normally is missing in a car.

It is not the purpose to restore the original sense of space but to create new sense of space which is not depending on the limitations of the actual room.

The equipment is mainly designed for research and development work. This can be seen in its I/0-functions and adapters, it has also been designed for expanding the system. However, it is usable in the practical applications.

The power supply is 12V, from which 5V for components is made. The equipment can be switched on by external control signal from the control adapter of the amplifier in car radio.