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 )
Annex 1: Transmission of RF
1. Though same frequency is allocated in some countries, national regulations may specify different
EIRP, spurious emission or other requirements.
2. The DF990 model is designed to meet the FCC standard part 15.245 and is aimed for use in the
America.
3. The regulations are subjected to change from time to time, please contact appropriate authorities for
full and up-to-dated information.
4. Useful websites:
Agency Website
The Code of Federal Regulations, USA http://www.access.gpo.gov/cgi-
bin/cfrassemble.cgi?title=199847
Federal Communications Commission http://www.fcc.gov/
Annex 2: FMCW Theory
Stationary Object
The relation between distance and frequency difference is:
k
c
R
ktf 


2
Where
R: Distance between sensor and object.
c: speed of light in freee space, 3*10
8
m/s
t

: measured time difference
k
: gradient of frequency change.
Where
k
T
B

T: frequency sweeping period of sensor
B
: frequency sweeping bandwidth.
So, distance is given by:
k
fc
R




2