1. Four Channel Ultrasonic Receiver Presented by: Chen Jia Team members: Brian Markus Danny Viselman

2. Overview Design and create a Four Channel Ultrasonic Receiver, capable of receiving signals between 30 kHz and 50 kHz. Capable of receiving a chirp ① signal as well as a constant frequency signal (Beacon). Will work with Team B’s Ultrasonic Transmitter.

3. Chip Chirp A chirp is a signal in which the frequency increases ('up-chirp') or decreases ('down-chirp') with time ②. Demonstration https://www.youtube.com/watch?v=5TGCFGs QIx0

4. System Design Level 0 Level 1

5. System design (cont.)

6. One Channel Breadboard

7. Single Channel

8. Transmitter

10. PCB Layout Last years’ 2 Channel Ultrasonic Receiver PCB

11. Signal Processing Four different signal into the ADC On-board oscillator set 35kHz to receive constant frequency from team B The external oscillator to receive the chirp from the transmitter Signal leaves the IF port of the mixer then passes through a low-pass filter and digitally processed by the DUE and o/p to the USB

12. Testing/Evaluation Figure 1 - Output of the mixer time domain and frequency domain, as well as the 33.5 kHz oscillator waveform O/p of the mixer time domain Oscillator waveform O/p of the mixer Frequency domain

13. Testing/Evaluation Figure 2 - Time and frequency output of receiver system (blue and pink, respectively) and transmitted signal from transmitter (yellow) Time o/p of receiver Signal Transmitted signal Frequency o/p

14. Testing/Evaluation Figure 3 - Transmitted signal (yellow), received signal (pink) and beat frequency output (blue) at a distance of 53 cm Transmitted signal Beat frequency o/p at 53 cm Received signal

15. Measured data plot in Matlab (Transmitted)

16. Measured data plot in Matlab (Received waveform)

17. Blue: beat frequency (o/p) Purple: FFT distance = 53 cm

18. Measured data plot in Matlab (Beat waveform)

19. Q & A