CN0566 EVK 14GHz

Question

1. CN0566 EVK Board is Developed X Band, Tx Antenna used Vivaldi 10.5GHz shall we make it 14GHz? what are the steps involved while developing the Antenna. 2. CN0566 EVK Rx Band Width 10 to 11GHz, Instead of Centre Frequency 10.5GHz Can we convert it into 14GHz? is there any modification Required? 3. With this EVK what distance will it capture? 
 
 Thanks & Regards 
 Purna

Jon.Kraft · Accepted Answer

You could operate it at 14 GHz by changing out the LPF and BPF filters. There should be other footprint compatible filters from MiniCircuits that will suppress the lower image and allow through the upper image. So look through this paper, and make the necessary changes: https://www.analog.com/media/en/reference-design-documentation/reference-designs/cn0566.pdf 
 1. Yes, you can connect up a different transmit antenna for 14 GHz 
 2. The integrated phased array antenna panel only operates between about 10 and 11 GHz. However, you can solder in SMP connectors and then use SMP cables to connect up to your own 14 GHz phased array antenna. 
 3. Do you mean comms receive, or radar receive? Many factors impact the range. You would have to run an analysis for your signals and setup--perhaps using the Matlab radar toolkit, etc.)

Jon.Kraft · Answer

Yes, all those files are here: wiki.analog.com/.../overview_setup

Jon.Kraft · Answer

No, I don't have the exact part numbers. You will need to do your own frequency plan and find compatible filters to swap out with the existing ones. I've never tried it, but I think it should be possible. For the LO, you can either use the external LO input, or use a low side LO injection--instead of the existing high side LO freq plan. But you should study this thoroughly before starting any project.

Jon.Kraft · Answer

Just this week, the new batch of Phaser kits arrived at our warehouse. They are now shipping out to fill backorders at Mouser, Digikey, and Newark. I would expect you should have your board in the next week or two. All code is available on our wiki site and github page. See the links in the CN0566 webpage.

Jon.Kraft · Answer

Those that have placed an order for CN0566 on Digikey/Mouser/Newark have had their order completed. We have some units left in the warehouse, but are these are being quickly depleted. If you completed your order on Mouser, you should have it very soon. If not, please contact Mouser.

Jon.Kraft · Answer

You can find videos and example code on this here: www.youtube.com/playlist

Jon.Kraft · Answer

This error is because either your Pluto is not plugged in, or the Pluto firmware is not configured to be dual transmit/receive, or there is an issue with your SD card.

Jon.Kraft · Answer

The array is receive only for a couple of reasons: 1. Many arrays commonly have more receive elements than transmit elements, as receiving an unknown signal generally requires more antenna elements than transmitting a known signal. 2. This board is primarily an educational learning platform, and receiving a signal is much more visually intresting than beamforming a transmit signal and not being able to see where it has gone. 3. Finally, it is less power and cost to receive. It is because the transmit amplifiers use more power and cost more. 
 In reply to your list of questions on 4/18, let me emphasize the second point that I made above. Phaser is a learning/prototyping platform for phased array radar. Many of your questions are just things that need to be learned to get a radar running. I suggest getting a radar textbook and going through chapters, while trying to implement them on Phaser. I think you will learn a lot, and it will prepare you for building your own real radar system. 
 For the questions that do apply to Phaser: 3. You can connect two transmitters, but only one is active at a time. This is a switched transmit system that is used in virtual arrays. 6. Yes, I think that divergence is due to some small timing mismatch between the sample clock and the multi chirp pulses. You can calibrate that mismatch out. Or try increasing the sample rate.

Jon.Kraft · Answer

This error is because you did not install the "Communications Toolbox Support Package for Analog Devices ADALM-Pluto Radio". Please make sure you are following all of the steps here: 
 https://wiki.analog.com/phaser_matlab

pcr · Answer

Now it's working, followed by the below link. 
 Pluto does not start ready led does not Blink - Q&A - Virtual Classroom for ADI University Program - EngineerZone (analog.com)

Jon.Kraft · Answer

We are working on a new device tree to be able to use the Rasp Pi 5, but it will not be ready for a few months. However, it will be much faster to not use the raspberry pi. Instead, connect Pluto to your computer, and connect ethernet from computer to the Phaser's Rasp Pi 4. Then, run Python/Matlab on your computer. 
 https://wiki.analog.com/phaser_matlab#getting_started_and_setup 
 Even so, there will be some delay. In a real radar system, the processing is handled by an FPGA or DSP chip. Phaser is meant only for education and exploration purposes, not for real time radar use.

Jon.Kraft · Answer

Yes, MATLAB works very well with Phaser. See this link for more details: 
 https://github.com/mathworks/Phaser-Control-with-MATLAB/tree/main 
 Regarding question #2, please contact your Mathworks representative for their recommendations. 
 For question 3, follow the setup instructions here: https://wiki.analog.com/phaser_matlab

pcr · Answer

Hi Jon.Kraft,

Phaser Plot : CN0566 & VIVALDI Antenna when both opposite placed, the Angle detecting up to one meter. After increasing the gap more than a meter plot shown 40 degrees constantly even angle is less. Please comment and suggestion. 
 When trying to read the object echo is not detecting in phaser GUI. 
 Can we connect two Tx Antennas at a time & functioning ? 
 After applying 2D FFT in RAW data the 2D array ( 900,num_chirps) is plotted with using of imshow(). Which basis these points are plotting. 
 How to map these values (900,num_chirps) to range and velocity in the range doppler plot, when the target is detected and track the target by printing the range and velocity in this scenario 
 When target is not detected, Plot dividing two parts and receiving unwanted noise, how to eliminate ? as shown in pic.

pcr · Answer

Hi Jon.Kraft, 
 Thank you for your Support. 
 CN0566 EVK Phaser Board Detection is successful up to 100 meters but while testing we are experiencing latency of 3 sec ( Delay ) Detecting the object in GUI. 
 Present this EVK is using the Raspberry Pi4 board instead of that can we use Raspberry Pi5, to minimize the latency or Delay? What are the Challenges of upgrading to Raspberry Pi5 Could you please confirm in this regard? 
 If not upgrading to Raspberry Pi5 Board, what are other ways to reduce the latency or delay in object detection? 
 Thanks & Regards Purna

Jon.Kraft · Answer

You'll need to start a new thread for that product. Actually, each question that you ask should be a new thread.

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CN0566 EVK 14GHz