Azimuth and Elevation with 3rx antenna radar

[lucasvgomes]

Hello,
Is there any function in the SDK that I can use to retrieve the Azimuth and Elevation angle from the radar data?
I know the SDK has the Range-angle image algorithm, but I didn't find any example that uses this algorithm. Is it possible to use Range-angle image for this? Is there any example that uses this algorithm?

Thanks,

Lucas

[Neo_Lu]

Hi, Lucas

Can we know which type of Radar device and the SDK you are using? 

We can solve the problem smoothly with your feedback.

Thanks,

Neo Lu

[lucasvgomes]

Hello Neo Lu,

I am using the 60Ghz Radar BGT60TR13 and downloaded the last RDK version 3.2.1.202205180921

[Neo_Lu · Accepted solution]

Hi, Lucas

Thank you for the information.

The Azimuth and Elevation angle can be retrieved by the Range-angle image algorithm.

1. There three antennas three antennas in an L shape for detecting azimuth and elevation angle, as shown in the picture:

2. The demo code provided by SDK, python script for example, can detect one of azimuth and elevation angle by enabling RX2&RX3 or RX1&RX3, so we can get both azimuth and elevation angle by switching these two Combinations, the part of the code is shown below, full demo can be found in folder :

Radar Development Kit\3.2.1.202205180921\application\RDK-TOOLS-SW.zip\RDK-TOOLS-SW\SDK\apps\py\examples\range-angle-map.py

"'rx_mask': 5, # activate RX1 and RX3"

if __name__ == '__main__':
    num_beams = 27         # number of beams
    max_angle_degrees = 40 # maximum angle, angle ranges from -40 to +40 degrees

    config = {
        'sample_rate_Hz': 1_000_000,       # 1MHZ
        'rx_mask': 5,                      # activate RX1 and RX3
        'tx_mask': 1,                      # activate TX1
        'if_gain_dB': 33,                  # gain of 33dB
        'tx_power_level': 31,              # TX power level of 31
        'start_frequency_Hz': 60e9,        # 60GHz 
        'end_frequency_Hz': 61.5e9,        # 61.5GHz
        'num_chirps_per_frame': 128,       # 128 chirps per frame
        'num_samples_per_chirp': 64,       # 64 samples per chirp
        'chirp_repetition_time_s': 0.0005, # 0.5ms
        'frame_repetition_time_s': 0.15,   # 0.15s, frame_Rate = 6.667Hz
        'mimo_mode': 'off'                 # MIMO disabled
    }

Hope that will help you.

Thanks,  

Neo Lu

[lucasvgomes]

Hi Neo Lu thanks for the reply,

I see. My implemmentation needs to be done in C, but I see the SDK has similar algorithms with similar interfaces for C from those used in this python example.
So I need to configure the radar to receive from a pair of antennas read a frame and calculate one of the angles, and then reconfigure the radar changing the pair of receive antennas, read another frame to get another angle.
I shouldn't configure the radar to receive from all 3 antennas, is that correct?

Thank you,
Lucas

[Neo_Lu]

Hi, Lucas

C has similar algorithms and interfaces as python in the SDK.

The functions about angle calculation like "ifx_anglemonopulse_scalar_run()" and "ifx_anglemonopulse_vector_run()" contain only parameters of two antennas.

So it's not supported by SDK to receive from all 3 antennas in single testing cycle.

Thanks,

Neo Lu

[lucasvgomes]

Got it,

Thank you very much!