From 7f05c3159f28a70906c455ccfc6b64379681b849 Mon Sep 17 00:00:00 2001
From: JosefProbst <34884555+JosefProbst@users.noreply.github.com>
Date: Fri, 26 Apr 2019 18:05:52 +0200
Subject: [PATCH] Update GPSPropagator.java

If x.getValue() or/and x0.getValue() is Double.NaN this is a endless loop.
---
 .../org/orekit/propagation/analytical/gnss/GPSPropagator.java   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/org/orekit/propagation/analytical/gnss/GPSPropagator.java b/src/main/java/org/orekit/propagation/analytical/gnss/GPSPropagator.java
index 652c6acaed..4ae5875db1 100644
--- a/src/main/java/org/orekit/propagation/analytical/gnss/GPSPropagator.java
+++ b/src/main/java/org/orekit/propagation/analytical/gnss/GPSPropagator.java
@@ -356,7 +356,7 @@ private DerivativeStructure eMeSinE(final DerivativeStructure E) {
         DerivativeStructure term = E;
         DerivativeStructure d    = E.getField().getZero();
         // the inequality test below IS intentional and should NOT be replaced by a check with a small tolerance
-        for (DerivativeStructure x0 = d.add(Double.NaN); x.getValue() != x0.getValue();) {
+        for (DerivativeStructure x0 = d.add(Double.NaN); !x.getValue().equals(x0.getValue());) {
             d = d.add(2);
             term = term.multiply(mE2.divide(d.multiply(d.add(1))));
             x0 = x;