fixed issues in sigmoid sensor model causing inverted response (annular partitions)

sensorModels/@fixedCardinalSensor/sensorPerformance.m

@@ -0,0 +1,14 @@
+function value = sensorPerformance(obj, agentPos, agentPan, agentTilt, targetPos)
+    arguments (Input)
+        obj (1, 1) {mustBeA(obj, 'fixedCardinalSensor')};
+        agentPos (1, 3) double;
+        agentPan (1, 1) double;
+        agentTilt (1, 1) double;
+        targetPos (:, 3) double;
+    end
+    arguments (Output)
+        value (:, 1) double;
+    end
+
+    value = 0.5 * ones(size(targetPos, 1), 1);
+end