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RADAR
Course coordinator: Arpan Deyasi
3/12/2021 1
Arpan Deyasi, India
3/12/2021 2
Arpan Deyasi, India
electromagnetic based detection system that works by
radiating em waves and then studying the echo or the
reflected back waves
What is RADAR?
RADAR: RAdio Detection And Ranging
3/12/2021 3
Arpan Deyasi, India
Block
Diagram
of
RADAR
Transmitter
Antenna
Target
Target Detection
and Ranging
Receiver
Range to Target
3/12/2021 4
Arpan Deyasi, India
Technical Parameters
Range
Distance between Radar and target is called Range (R )
of the target
2
ct
R =
3/12/2021 5
Arpan Deyasi, India
Pulse Repetition Frequency
Technical Parameters
Radar signals are transmitted at every clock pulse.
The duration between the two clock pulses should be chosen in
such a manner that the echo signal corresponding to present
clock pulse will be received before the next clock pulse.
The time interval between the successive clock pulses is called
pulse repetition time (TP)
Reciprocal of pulse repetition time is called pulse repetition
frequency
Pulse repetition frequency (fP) is nothing but the frequency at
which Radar transmits the signal
3/12/2021 6
Arpan Deyasi, India
Technical Parameters
Maximum Unambiguous Range
Select the duration between the two clock pulses in such a
manner that echo signal corresponding to present clock
pulse will be received before the next clock pulse starts
True range of the target can be obtained and it is defined
maximum unambiguous range of the target
2 2
P
un
P
cT c
R
f
= =
3/12/2021 7
Arpan Deyasi, India
Technical Parameters
Minimum Range
If time required for the echo signal to receive at Radar after
the signal being transmitted from the Radar becomes
equals to pulse width, then corresponding range is defined
as minimum range
min
2
c
R
τ
=
3/12/2021 8
Arpan Deyasi, India
Radar Range Equation
Pt: amount of power transmitted by the Radar transmitter
Pdi: power density, at a distance, R from the Radar with
isotropic antenna
2
4
t
di
P
P
R
π
=
3/12/2021 9
Arpan Deyasi, India
Radar Range Equation
If isotropic antenna is replaced by directional antenna
with gain G
2
4
t
dd
PG
P
R
π
=
Pdd: power density, at a distance, R from the Radar with
directional antenna
3/12/2021 10
Arpan Deyasi, India
Radar Range Equation
Pde: power density of echo signal at RADAR
σR: cross-section of RADAR
2
4
dd R
de
P
P
R
σ
π
=
3/12/2021 11
Arpan Deyasi, India
Radar Range Equation
Pr: received power by RADAR
σe: effective aperture of receiving antenna
r de e
P P σ
=
3/12/2021 12
Arpan Deyasi, India
Radar Range Equation
r de e
P P σ
=
2
4
dd R
r e
P
P
R
σ
σ
π
=
2 2
4 4
t R
r e
PG
P
R R
σ
σ
π π
=
3/12/2021 13
Arpan Deyasi, India
Radar Range Equation
( )
2 4
4
t
r R e
PG
P
R
σ σ
π
=
( )
0.25
2
4
t
R e
r
PG
R
P
σ σ
π
 
=  
 
 
3/12/2021 14
Arpan Deyasi, India
Radar Range Equation
σe: effective aperture of antenna
2
4 e
G
πσ
λ
=
3/12/2021 15
Arpan Deyasi, India
Radar Range Equation
( )
0.25
2 2
4
4
t e
R e
r
P
R
P
πσ
σ σ
λ
π
 
=  
 
 
( )
0.25
2
2
1
4
t
R e
r
P
R
P
σ σ
π λ
 
=  
 
3/12/2021 16
Arpan Deyasi, India
Radar Range Equation
For Pr = Pmin, R = Rmax
( )
0.25
2
max 2
min
1
4
t
R e
P
R
P
σ σ
π λ
 
=  
 
3/12/2021 17
Arpan Deyasi, India
Radar Range Equation
Thermal noise power
0
i B r
N k T B
=
Figure of Merit
( )
( )
i
o
SNR
F
SNR
=
3/12/2021 18
Arpan Deyasi, India
Radar Range Equation
0 0
/
/
i i
S N
F
S N
=
0
0
i
i
S N
F
S N
=
3/12/2021 19
Arpan Deyasi, India
Radar Range Equation
0
0
i
i
S N
S F
N
=
0 0
0
B r
i
S k T B
S F
N
=
0 0
0
B r
r
S k T B
P F
N
=
3/12/2021 20
Arpan Deyasi, India
Radar Range Equation
( )
0.25
2 0
max 2
0 0 min
1
4
t
R e
B r
P N
R
Fk T B S
σ σ
π λ
 
 
=  
 
 
 
 
0
min 0
0 min
B r
S
P Fk T B
N
 
=  
 
3/12/2021 21
Arpan Deyasi, India
Classification of RADAR
based on the signal type with which Radar can be operated
Pulse Radar
Continuous Wave Radar
3/12/2021 22
Arpan Deyasi, India
Classification of RADAR
operates with pulse signal
Pulse Radar:
based on the type of the target it detects
Basic Pulse Radar MTI Radar
3/12/2021 23
Arpan Deyasi, India
Classification of RADAR
Basic Pulse Radar
operates with pulse signal for detecting stationary targets
uses single Antenna for both transmitting and receiving
signals with the help of Duplexer
duration between the two clock pulses should be chosen
in such a way that the echo signal corresponding to the
present clock pulse should be received before the next
clock pulse
3/12/2021 24
Arpan Deyasi, India
Moving Target Indication Radar
Classification of RADAR
operates with pulse signal for detecting non-stationary
targets
uses single Antenna for both transmitting and receiving
signals with the help of Duplexer
uses the principle of Doppler effect for distinguishing
the non-stationary targets from stationary objects
3/12/2021 Arpan Deyasi, India 25
Classification of RADAR
operates with continuous signal
CW Radar:
based on the modulation scheme
Unmodulated CW Radar FM CW Radar
3/12/2021 Arpan Deyasi, India 26
Classification of RADAR
Unmodulated Continuous Wave Radar
operates with continuous signal (wave) for detecting
non-stationary targets
also called CW Doppler Radar
measures only the speed of the target
3/12/2021 Arpan Deyasi, India 27
Classification of RADAR
Frequency Modulated Continuous Wave Radar
operates with frequency modulated continuous signal
measures not only the speed of the target but also
the distance of the target from the Radar
3/12/2021 28
Arpan Deyasi, India
Applications
 Controlling the Air Traffic
 Sensing the remote places
 Ship safety
 Military applications

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RADAR Fundamentals

  • 1. RADAR Course coordinator: Arpan Deyasi 3/12/2021 1 Arpan Deyasi, India
  • 2. 3/12/2021 2 Arpan Deyasi, India electromagnetic based detection system that works by radiating em waves and then studying the echo or the reflected back waves What is RADAR? RADAR: RAdio Detection And Ranging
  • 3. 3/12/2021 3 Arpan Deyasi, India Block Diagram of RADAR Transmitter Antenna Target Target Detection and Ranging Receiver Range to Target
  • 4. 3/12/2021 4 Arpan Deyasi, India Technical Parameters Range Distance between Radar and target is called Range (R ) of the target 2 ct R =
  • 5. 3/12/2021 5 Arpan Deyasi, India Pulse Repetition Frequency Technical Parameters Radar signals are transmitted at every clock pulse. The duration between the two clock pulses should be chosen in such a manner that the echo signal corresponding to present clock pulse will be received before the next clock pulse. The time interval between the successive clock pulses is called pulse repetition time (TP) Reciprocal of pulse repetition time is called pulse repetition frequency Pulse repetition frequency (fP) is nothing but the frequency at which Radar transmits the signal
  • 6. 3/12/2021 6 Arpan Deyasi, India Technical Parameters Maximum Unambiguous Range Select the duration between the two clock pulses in such a manner that echo signal corresponding to present clock pulse will be received before the next clock pulse starts True range of the target can be obtained and it is defined maximum unambiguous range of the target 2 2 P un P cT c R f = =
  • 7. 3/12/2021 7 Arpan Deyasi, India Technical Parameters Minimum Range If time required for the echo signal to receive at Radar after the signal being transmitted from the Radar becomes equals to pulse width, then corresponding range is defined as minimum range min 2 c R τ =
  • 8. 3/12/2021 8 Arpan Deyasi, India Radar Range Equation Pt: amount of power transmitted by the Radar transmitter Pdi: power density, at a distance, R from the Radar with isotropic antenna 2 4 t di P P R π =
  • 9. 3/12/2021 9 Arpan Deyasi, India Radar Range Equation If isotropic antenna is replaced by directional antenna with gain G 2 4 t dd PG P R π = Pdd: power density, at a distance, R from the Radar with directional antenna
  • 10. 3/12/2021 10 Arpan Deyasi, India Radar Range Equation Pde: power density of echo signal at RADAR σR: cross-section of RADAR 2 4 dd R de P P R σ π =
  • 11. 3/12/2021 11 Arpan Deyasi, India Radar Range Equation Pr: received power by RADAR σe: effective aperture of receiving antenna r de e P P σ =
  • 12. 3/12/2021 12 Arpan Deyasi, India Radar Range Equation r de e P P σ = 2 4 dd R r e P P R σ σ π = 2 2 4 4 t R r e PG P R R σ σ π π =
  • 13. 3/12/2021 13 Arpan Deyasi, India Radar Range Equation ( ) 2 4 4 t r R e PG P R σ σ π = ( ) 0.25 2 4 t R e r PG R P σ σ π   =      
  • 14. 3/12/2021 14 Arpan Deyasi, India Radar Range Equation σe: effective aperture of antenna 2 4 e G πσ λ =
  • 15. 3/12/2021 15 Arpan Deyasi, India Radar Range Equation ( ) 0.25 2 2 4 4 t e R e r P R P πσ σ σ λ π   =       ( ) 0.25 2 2 1 4 t R e r P R P σ σ π λ   =    
  • 16. 3/12/2021 16 Arpan Deyasi, India Radar Range Equation For Pr = Pmin, R = Rmax ( ) 0.25 2 max 2 min 1 4 t R e P R P σ σ π λ   =    
  • 17. 3/12/2021 17 Arpan Deyasi, India Radar Range Equation Thermal noise power 0 i B r N k T B = Figure of Merit ( ) ( ) i o SNR F SNR =
  • 18. 3/12/2021 18 Arpan Deyasi, India Radar Range Equation 0 0 / / i i S N F S N = 0 0 i i S N F S N =
  • 19. 3/12/2021 19 Arpan Deyasi, India Radar Range Equation 0 0 i i S N S F N = 0 0 0 B r i S k T B S F N = 0 0 0 B r r S k T B P F N =
  • 20. 3/12/2021 20 Arpan Deyasi, India Radar Range Equation ( ) 0.25 2 0 max 2 0 0 min 1 4 t R e B r P N R Fk T B S σ σ π λ     =           0 min 0 0 min B r S P Fk T B N   =    
  • 21. 3/12/2021 21 Arpan Deyasi, India Classification of RADAR based on the signal type with which Radar can be operated Pulse Radar Continuous Wave Radar
  • 22. 3/12/2021 22 Arpan Deyasi, India Classification of RADAR operates with pulse signal Pulse Radar: based on the type of the target it detects Basic Pulse Radar MTI Radar
  • 23. 3/12/2021 23 Arpan Deyasi, India Classification of RADAR Basic Pulse Radar operates with pulse signal for detecting stationary targets uses single Antenna for both transmitting and receiving signals with the help of Duplexer duration between the two clock pulses should be chosen in such a way that the echo signal corresponding to the present clock pulse should be received before the next clock pulse
  • 24. 3/12/2021 24 Arpan Deyasi, India Moving Target Indication Radar Classification of RADAR operates with pulse signal for detecting non-stationary targets uses single Antenna for both transmitting and receiving signals with the help of Duplexer uses the principle of Doppler effect for distinguishing the non-stationary targets from stationary objects
  • 25. 3/12/2021 Arpan Deyasi, India 25 Classification of RADAR operates with continuous signal CW Radar: based on the modulation scheme Unmodulated CW Radar FM CW Radar
  • 26. 3/12/2021 Arpan Deyasi, India 26 Classification of RADAR Unmodulated Continuous Wave Radar operates with continuous signal (wave) for detecting non-stationary targets also called CW Doppler Radar measures only the speed of the target
  • 27. 3/12/2021 Arpan Deyasi, India 27 Classification of RADAR Frequency Modulated Continuous Wave Radar operates with frequency modulated continuous signal measures not only the speed of the target but also the distance of the target from the Radar
  • 28. 3/12/2021 28 Arpan Deyasi, India Applications  Controlling the Air Traffic  Sensing the remote places  Ship safety  Military applications