6.101 design presentation · 6.101 design presentation helmuth naumer and mark theng. active sonar...
TRANSCRIPT
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6.101 Design Presentation
Helmuth Naumer and Mark Theng
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Active Sonar Tracking System
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Ideal End Result
Angle
Distance
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Quick Background Information● Linear Array Beamforming
● I/Q signals
● Windowed Pulse
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Introduction to Beamforming
Path LengthDifference
θ
Antenna Spacing
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I/Q Signals
In Phase and Quadrature
Phase Manipulation
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Pulse Design
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Pulse Design
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System Overview
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CompleteSystem Architecture
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BeamformingArray
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Voltage ControlledPhase Shifter
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All-PassFilter
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Voltage ControlledAmplifier
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Signal Conditioning
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Sound
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System Overview (Recap)
No feedback!
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Angle Sweep (Triangle Wave Generator)
Thresholding → Square Wave
Integrator
Min/Max more important than frequency
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Timer
Current Source
ThresholdingCharge on cap measures time
OUT
TICKNeed to prevent partial reset
← Reset
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Timer
Current Source
ThresholdingCharge on cap measures time
IN
OUT
← Reset
OUT
TICK
Pulse Extender
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Sampling
Drawing takes 2ms
Angle changes by 10mV -- acceptableTimer changes by 0.26V -- not acceptable
Need to sample timer voltage before drawing
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Sampler
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Sampler
Body Diode
Doesn’t work!
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SamplerIN
OUT
Ensure current only flows in one direction
Current
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Drawing
Angle
Distance
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Drawing Circles
90° Phase Shift
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Challenges● Noisy Signals
○ Interference and false echoes● Mathematical Precision
○ Accurate phase shifts for beamforming● Small Voltages
○ 5V USB power supply
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Timeline
4/16 4/23 4/30 5/7Single Microphone
Beamforming PCB/Stretch Goals
Final Debugging/ Checkoff
Distance reading only
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Thank You!
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Voltage ControlledPhase Shifter
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Trigger Generator
RC Timer
BJT Buffer
IN
OUT