RFbeam Microwave GmbH

RSP1 Radar Processor

Datasheet

4 RSP1 Architecture

4.1 Data Acquisition

An internal, programmable differential amplifier allows gains from 1 to 16.

RSP1 works with 2 12Bit ADCs, sampling rate is selectable between 1'200Hz up to 22.5kHz in 10 steps.

This corresponds to maximum speeds from 13km/h to 250km/h.

4.2 Data Processing

Processing is based on a complex FFT and on an adaptive noise threshold. Many parameters allow

adjusting and optimizing the performance for many different applications.

Advantages of FFT

FFT stands for Fast Fourier Transform, that allows signal processing in the frequency domain (see

details on http://en.wikipedia.org/wiki/Fft).

Processing of the Quadrature Doppler signals is performed by a complex FFT. Using FFT results in much

better performance than using simple comparator designs or time domain processing.

The RSP1 FFT implementation leads to sophisticated movement and speed detectors:

•

Better S/N (21dB with 256pt FFT) → 2 to 3 times larger detection range

•

Inherent object speed detection

•

Reliable distiction between approaching / receding objects

•

Efficient interference suppression through complex FFT (fluorescent light, rain, vibrations …)

•

Narrowband filtering of known interference frequencies

•

Selective and adaptive noise threshold capability

RSP1 Hardware Architecture

The processor architecture allows data acquisition and processing in parallel. Only a few external

components are needed thanks to the high integration level including EEPROM and precision clock

generator.

Fig. 4: RSP1 simplified block diagram

© RFbeam Microwave GmbH www.rfbeam.ch

December 11, 2015

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Timer & Event System

ADC

Flash

EEPROM

5 x Out

4 x In

Control

Debug

digital

serial

analog

VCO

DMA

RAM

CPU

I/O

Sensor I

Sensor Q

Ref In

Hold Pot

Sens. Pot

12 Bit

A = 1 .. 16

ADC

ADC