RFbeam Microwave GmbH

RSP1 Radar Processor

Datasheet

6.2 I/Q Signal Processing

RSP1 supports I/Q processing by using complex FFT. I/Q Doppler signals are phase shifted by + 90° or

-90°. Those signals appear either in the real(right) plane or in the imaginary (left) plane of the FFT output.

Signal in the center is the DC offset caused by the amplifier and ADC converter and can be ignored.

(see Fig. 8).

Main advantages of using I/Q sensors compared to single channel sensors:

•

Forward / Backward movement differentiation

•

Efficient interference suppression

•

Vibration suppression

Even if directional detection is not required, I/Q processing allows significantly better immunity

suppression.

Doppler I and Q signals in Time domain at RSP1 Radar inputs:

Doppler signals in Frequency domain, processed by RSP1:

Fig. 8: FFT magnitude of forward moving and backward moving objects

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December 11, 2015

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Fig. 7: I/Q signals left: approaching; right receding movement

Q signal

I signal

I signal

Q signal