Monopulseradar
Transcript of Monopulseradar
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MONOPULSE RADAR
PHANI RAHUL G K CHAITANYA DONEPUDI
H.P
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INTRODUCTION
Basic operating principle Tracking radars Techniques of target detection Examples of monopulse radar systems
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
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RADIO DETECTION AND RANGING
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
•OBJECT DETECTION SYSTEM
•USES ELECTROMAGNETIC WAVES TO IDENTIFY TARGET CHARACTERISTICS
•RADAR CAN FUNCTION UNDER CONDITIONS IMPERVIOUS TO OPTICAL AND INFRARED SENSORS
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RADAR FUNCTIONS
NORMAL RADAR FUNCTIONS1. Range (from pulse delay)
2. Velocity (from Doppler frequency shift)
3. Azimuth and Elevation (from antenna pointing)
SIGNATURE ANALYSIS and INVERSE SCATTERING
1. Target size (from magnitude of return)
2. Target shape and components (return as a function of direction)
3. Moving parts (modulation of the return)
4. Material composition
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
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SLANT RANGE
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
DISTANCE TO TARGET = DT (SLANT RANGE) D
T
N
W
E
S
ANTENNA ROTATIONO
P
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AZIMUTH ANGLE
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
DT
N
W
E
S
ANTENNA ROTATIONO
P
PITRUENORTH AT
AZIMUTH ANGLE = AT
AT = NOPI
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ELEVATION ANGLE
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
DT
N
W
E
S
ANTENNA ROTATIONO
P
H.P
PI
ANGLE OF ELEVATION = ET
ET = 0PPI
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TRACKING RADAR
Measures the coordinates and provides data to determine target path
Tracking can be performed in range, angle and doppler
Classified into two typesContinuous tracking radar Track-While-Scan radar
Acquisition radar designates targets to the tracking radar
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
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TRACKING RADAR
TRACKING RADAR
MISSILE TRACKIN
G
MISSILE
GUIDANCE
INSTRUMENTATIO
N RADARS
SPACE APPLICATI
ONS
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
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TRACKING RADAR
Error signal generating methods1. Sequential lobing
2. Conical scan
3. Simultaneous lobing (monopulse)
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
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SEQUENTIAL LOBING Two lobes are required to
track in each axis, each lobe must be sequentially switched four pulses are required
The radar measures the returned signal levels
The voltages in the two switched position should be equal
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
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SEQUENTIAL LOBING
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
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CONICAL SCAN
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
•The antenna is continuously rotated at an offset angle.
• Redirection of beam Rotating feed Nutating feed
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CONICAL SCAN
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
All target returns have the same amplitude (zero error signal)
Thus, no action is required
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CONICAL SCAN
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
B A
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DISADVANTAGES
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
Sequential lobing1) Angle accuracy can be no better than the size of the antenna
beamwidth. 2) Variation in echo strength on a pulse-by-pulse basis changes the
signal level thereby reducing tracking accuracy3) The antenna gain is less than the peak gain in beam axis
direction, reducing maximum range that can be measured
Conical scan4) The antenna scan rate is limited by the scanning mechanism
(mechanical or electronic)5) Sensitive to target modulation6) Mechanical vibration and wear and tear due to rotating feed
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SIMULTANEOUS LOBING
With a single pulse angular coordinates can be obtained
Maximum unambiguous range is limited only by PRF
Monopulse is free of mechanical vibrations
Errors due to amplitude fluctuation of target echoes are greatly reduced
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
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MONOPULSE BLOCK DIAGRAM
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
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SUM AND DIFFERENCE PATTERNS
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
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HYBRID JUNCTIONS
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
Hybrid T junction
Hybrid ring (‘RAT’ race junction)
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AMPLITUDE AND PHASE COMPARISON MONOPULSE
A total of four hybrid junctions generate sum, azimuth and elevation difference channel
Range information is extracted form the output of the sum channel after amplitude detection
The angular error signal is obtained by comparing echo amplitudes which actuates a servo mechanism to position the antenna
The angle of arrival is determined by comparing the phase difference between signals from two separate antennas
Antennas of phase comparison are not offset from the axis
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
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COMPARISON OF TRACKERS In phase comparison four antennas are placed in awkward
direction and its side lobe levels are high Sequential lobing suffers more losses with complex antenna
and feed system Amplitude comparison has high SNR It has higher precision in target tracking due to the absence
of target amplitude fluctuations Angle error in two coordinates can be obtained by a single
pulse Conscan integrates no of pulses and then extracts angle
measurement but vice versa in monopulse
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
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NIKE AJAX GUIDANCE SYSTEM
First missile guidance system to employ monopulse technique
Developed in 1953
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
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PATRIOT AIR DEFENCE SYSTEM
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
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CONCLUSION
It is used if extreme accuracy is needed Its improved interference immunity,
resolution, radar signal processing and angular accuracy made it imperative in all modern missile tracking/guidance systems
"MONOPULSE RADAR " by Phani Rahul G K and Chaitanya Donepudi
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