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NAIC Visiting Committee Meeting · March 4-6, 2008 FPGA SPECTROMETER COMMISSIONING Spectrometer description How it will be used Where we are at. What needs.

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Presentation on theme: "NAIC Visiting Committee Meeting · March 4-6, 2008 FPGA SPECTROMETER COMMISSIONING Spectrometer description How it will be used Where we are at. What needs."— Presentation transcript:

1 NAIC Visiting Committee Meeting · March 4-6, 2008 FPGA SPECTROMETER COMMISSIONING Spectrometer description How it will be used Where we are at. What needs to be done More info:http://www.naic.edu/~phil/hardware/pdev

2 NAIC Visiting Committee Meeting · March 4-6, 2008 Description.. what we bought 20 spectrometer boxes purchased from jeff mock … (jeff who??) 1 box can process 1 beam of alfa. 14 boxes allows for 2 simultaneous alfa experiments. 2 boxes for aeronomy, planetary radar 16 fileservers (each with 4 Tbytes of disc). IF mixer chassis IF to base band (I,Q) (dana)

3 NAIC Visiting Committee Meeting · March 4-6, 2008 Description.. 1 box 2 paths each handling 170 MHz Bandwidth A/D.. 12 bit 170 Mhz I Q samplers Digital mixer. Digital low pass filter (decimation ) Optional time domain data: 4,8,16 bits Polyphase filter bank..16 to 8192 channels. I, polA/B, full stokes power computation. Sum spectra. Output 32,16,8 bit spectral data. Box output I/O rate: 80 Mbytes/sec.

4 NAIC Visiting Committee Meeting · March 4-6, 2008 How it will be used Alfa: covers MHz x 7 beams Galfacts: galaxy full stokes –65Mb/sec * 7 = 450 Mb/sec. Palfa search: Upgrade 100 to 300 MHz BW. –32Mb/sec*7= 225 Mb/sec. Aeronomy: IF sampling, time domain data (Tamara) –32,20,10,.. bandwidths. 32 MHz Bw gets plasma line in 1 band –Sampling synced to transmitter pulses and echo return. Planetary Radar: IF sampling, time domain data. (Tamara) –40,20,10,.. Bandwidths with 2,4,8,16 bit samples. –Fir filters for CW, sync filters for ranging. –Digital doppler correction by interpolating, dropping samples. Single Pixel observations: –Use 7*300 MHz bandwidth to cover up tp 2 GHz bw.

5 NAIC Visiting Committee Meeting · March 4-6, 2008 Where we are at. Alfa: –Hardware 14 spectrometer boxes with 7 mixer chassis installed. 14 file servers installed, 7 in use. –Software: Acquires data, writes to disc in pdev or fits format. Aeron: –Test data taken in 32Mhz bw Mode Planetary radar –20 MHz bw data taken on saturns rings.

6 NAIC Visiting Committee Meeting · March 4-6, 2008 What needs to be done. Hardware/FPGA programming: –Resolve radar rfi saturation in PFB butterfly stages. If this is not solved, the lower 170 MHz will be unusable. –Take a closer look at birdies generated internally to the boxes. –Debug sync filters for planetary radar (Tamara) –Debug digital doppler (Tamara). –Single pixel.. Need to widen the downstairs IF/LO to handle 2 GHz bw.

7 NAIC Visiting Committee Meeting · March 4-6, 2008 What needs to be done (software) Integrate running of spectrometer with GUI. –This will take the most time. Fill in all fits header keyword data. Speed up startup configuration of device. Test winking cal, blanking. Automate optimum level setting and configuration for all possible configs. Pulsar users want psrfits format. This is different from the fits files we are generating. Analysis software. Continue developing IDL routines to verify the device operation. Work on system/program documentation (see web site).

8 NAIC Visiting Committee Meeting · March 4-6, 2008 When …. Shooting for may 2008 for galfacts alfa observing. This will also enable any of the other alfa spectral line surveys to use the device. Pulsar fits file format will come after galfacts (since palfa is already taking data). Planetary radar/aeronomy needs FPGA programming and Tamara Hall is leaving. –Till she leaves, radar/aeronomy work gets priority. 2 GHz single pixel still in the design stages.


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