User's Manual

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Band Microwave Motion Sen
sor Module
HB170 Users Manual
V1.0
0
ST Electronics (Satcom & Sensor Systems) Pte. Ltd.
29 New Industrial Road, ST Electronics Paya Lebar Building, Singapore 536213
Tel: [phone] Fax: [phone] Email: [e-mail]
Website: www.ag
ilsense.com (
Regn
:
199103901W
)
Annex 2: Doppler Equation
Where
F
d
= Doppler frequency
V = Velocity of the target
F
t
= Transmit frequency
c = Speed of light (3 X 10
8
m/sec)
 = The angle between the target moving direction and the axis of the module.
If a target is moving straight toward or away from HB100 (F
t
= 10.525 GHz) The formula is
simplified to:
F
d
= 19.49V (Velocity in km/hour) or 31.36V (V in mile per hour)
Conversion factors for other frequencies are shown below:
Frequency Fd (V in Km/hr) Fd (V in mph)
9.35 GHz 17.31V 27.85V
10.525 GHz 19.49V 31.36V
10.587 GHz 19.60V 31.54V
 Cos
c
F
2VF
t
d






