Issue with non-spherical harmonic fit to antenna response

Question

Issue with non-spherical harmonic fit to antenna response

Closed this issue a year ago · 4 comments

For some reason, when lmax=0 for nec.fit_antenna_response(), the antenna gain response at az=360 equals 0.

Answer 1 · 2023-07-12T19:24:45.000Z

Isn’t that what should happen?

On Jul 12, 2023, at 12:00 PM, Chris DiLullo ***@***.***> wrote: For some reason, when lmax=0 for nec.fit_antenna_response(), the antenna gain response at az=360 equals 0. — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you are subscribed to this thread.

Answer 2 · 2023-07-12T19:37:16.000Z

@jaycedowell I meant to say "lmax is None". I.e. when I try fitting a polynomial in frequency for each point on the sky without spherical harmonic decomposition, the resulting pattern has a strip of zeros at az=360 (but not az=0). I'd expect them to match obviously.

Answer 3 · 2023-07-12T21:16:05.000Z

Hrm. Missing modulus operator on the azimuth somewhere?

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On Jul 12, 2023, at 12:37 PM, Chris DiLullo ***@***.***> wrote: @jaycedowell I meant to say "lmax is None". I.e. when I try fitting a polynomial in frequency for each point on the sky without spherical harmonic decomposition, the resulting pattern has a strip of zeros at az=360 (but not az=0). I'd expect them to match obviously. — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you were mentioned.

Answer 4 · 2023-07-13T15:16:57.000Z

Ah, didn't realize the NEC models stopped at az=359. Fixed the issue by copying the response for az=0 to az=360.