User's Manual

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MSAN
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008
K-Band FMCW Transceiver DF Modules
Application Note
V1.0
1
ST Electronic
s (Satcom & Sensor Systems) Pte Ltd
1 Ang Mo Kio Electronics Park Road, #06-02, ST Engineering Hub, Singapore 567710
Tel: [phone] Fax: [phone] Email: [e-mail]
Website: www.agilsense.com ( Regn. No.: 199103901W )
Frequency Vs Tuning Voltage
23.95
24
24.05
24.1
24.15
24.2
24.25
24.3
24.35
24.4
0 2 4 6 8 10 12 14
Tuning Voltage
Frequency
Unit 1 Unit 2 Unit 3 Unit 4
Figure 3: FMCW Tuning Slope
Calibration is highly recommended for every unit.
5. FMCW Application and Theory
Introduction
Unlike normal comtinuous wave sensor which transmits signal at a fixed frequency, the FMCW sensor
transmits freqency that are swept at a pre-determined pattern. Due to the time of flight associated with
the distance, there will be a frequency difference between transmitted signal and received reflected
signal. The resulting signal therefore provides information on:
 Distance measurment
 Velocity measuremnt
 Direction of motion recognition
The following section explains the basic operation of FMCW sensor.