From ac5b966ca3deb8f669bbf88a697a6e3dc8e23e0d Mon Sep 17 00:00:00 2001
From: Bruce Wayne <harald.the.engineer@gmail.com>
Date: Thu, 24 Aug 2023 20:06:33 -0700
Subject: [PATCH] fix iono warning

---
 laika/iono.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/laika/iono.py b/laika/iono.py
index 42ddd0f..8228599 100644
--- a/laika/iono.py
+++ b/laika/iono.py
@@ -12,7 +12,8 @@
 def get_alpha_beta(rcv_pos, el):
     geocentric_alt = np.linalg.norm(rcv_pos)
     alpha = np.pi/2 + el
-    beta = np.arcsin(geocentric_alt*np.sin(alpha)/IPP_ALT)
+    arcsin_arg = geocentric_alt*np.sin(alpha)/IPP_ALT
+    beta = np.arcsin(np.clip(arcsin_arg, -1, 1))
     return alpha, beta
 
 def get_slant_delay(rcv_pos, az, el, sat_pos, time, freq, vertical_delay):