Changes between Version 35 and Version 36 of Other/Summer/2024/pD


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Timestamp:
Jul 30, 2024, 2:41:54 PM (4 months ago)
Author:
samcheung
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  • Other/Summer/2024/pD

    v35 v36  
    5555[[Image(Periodogram.png, 700px, align=center)]]
    5656
     57https://github.com/Autoraem/PlantDoctor
     58Currently, this system is a periodogram estimator. This system first removes the DC offset (subtract the mean of the signal in each frame) then applies a FFT to the input signal with a Blackman-Harris windowing function. This returns a frequency spectrum. There will also be a CFO (carrier frequency offset) that will be removed by subtracting the max of the frequency spectrum and shifting all FFT values over. Afterwards, two separate bandpass filters are applied only allowing the region of interest (+/- 100kHz-200kHz) to show. Then we find peaks in this region  which then becomes our estimate. To remove the effect from noise, we perform an averaging function.
    5759
     60We still need to do temperature interpolation and improve SNR and BER.
    5861==== WEEK SIX ====
    5962[https://docs.google.com/presentation/d/1IVHxp37dLoeeXByd_AVcU_r4t5fZpaF5VpObRvP3WJ0/edit?usp=sharing Weekly Presentation]\\
    … …  
    6972//Progress: // We fixed a small broken plexiglass chamber that we will use to store plants. Instead of breaking the entire panel, we chose to glue another sheet of plexiglass on top of it to prevent further cracking. This chamber will serve as a mockup for the remainder of the summer but the long-term goal is to build a large chamber with controls for humidity, temperature, and light.
    7073
     74We also did a live demo!
    7175
    7276==== WEEK EIGHT ====
    … …  
    7680[[Image(Plant Week 8 .png, 425px, align=center)]]
    7781
     82==== WEEK NINE ====
     83Digital sensors time
    7884== References ==
    7985(1) A. Bletsas, P. N. Alevizos and G. Vougioukas, "The Art of Signal Processing in Backscatter Radio for μW (or Less) Internet of Things: Intelligent Signal Processing and Backscatter Radio Enabling Batteryless Connectivity," in IEEE Signal Processing Magazine, vol. 35, no. 5, pp. 28-40, Sept. 2018, doi: 10.1109/MSP.2018.2837678.