RFbeam Microwave GmbH

RSP1 Radar Processor

Datasheet

5 Performance data

5.1 Overview

RSP1 is working at an internal clock frequency of 32MHz.

Radar I and Q signals pass a programmable gain amplifier (A=1 to 16). A 12Bit differential ADC running

at a 500kHz clock converts the amplified signals. I and Q channels are acquired quasi parallel with a time

shift of 2us.

Complex 256pt fixpoint FFT runs in parallel to the data aqcuisition. Time signal passes a Hanning

window and is then processed by the FFT.

Acquisition is interrupted only by a 300us windowing calculation time. All other signal processing is

performed in parallel to the data acquisition.

5.2 Internal Timing

Sampling timing depends on setting of parameter S03 (sampling rate). This results in following FFT

resolutions and measuring speed ranges:

Parameter S03 (hex)

fs (sampling freq.)

df (resolution)

max. speed

remark

01 … 08

S03 value * 1280Hz

5Hz to 40Hz

4.5km/h to 116km/h

allows direct readout of frequency

09

11.254kHz

44Hz (1km/h)

127km/h

allows direct readout of speed in km/h

0A

22.528kHz

88Hz (2km/h)

255km/h

allows direct readout of half speed

Fig. 5: Acquiring and processing executes in parallel. A small gap (t3) occurs during windowing

= 256 * 1/fs = 11.4ms … 200ms (with fs = 22.5kHz … 1280kHz)

= 7.7ms

FFT

= 2ms

Logarithmic result conversion

= 0.3ms

Hanning window calculation

ADC Sampling of both channels is performed quasi-parallel with a maximum time shift of 2us max.

5.3 Response time

Response time on parameter requests on sampling rate fs (parameter S03):

= 11.4ms * A03 value

(S03 = 0A)

= 200ms * A03 value

(S03 = 01)

Update time on result parameters and digital outputs depend on sampling rate fs (parameter S03), on

and immunity value (parameter A03) and on FFT avaraging (parameter S02).

= 11.4ms * A03 value

(S03 = 0A, S02 = 00)

or 22.8ms * A03 value (S02 = 01)

(S03 = 01, S02 = 00)

or 400ms * A03 value

(S02 = 01)

See also chapter 8.4 Sampling Rate and Frequency Resolution

© RFbeam Microwave GmbH www.rfbeam.ch

December 11, 2015

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