sys-id: implement linear and log sine sweeps

src/lib/system_identification/signal_generator.hpp

@@ -0,0 +1,66 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2024 PX4 Development Team. All rights reserved.
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+ ****************************************************************************/
+
+/**
+ * @file signal_generator.hpp
+ */
+
+#pragma once
+
+namespace signal_generator
+{
+
+float getLinearSineSweep(float f_start, float f_end, float duration, float t)
+{
+	if (t > duration) {
+		return 0.f;
+	}
+
+	const float w_start = f_start * M_TWOPI_F;
+	const float w_end = f_end * M_TWOPI_F;
+
+	return sinf(w_start * t + 0.5f * (w_end - w_start) * t * t / duration);
+}
+
+float getLogSineSweep(float f_start, float f_end, float duration, float t)
+{
+	if (t > duration) {
+		return 0.f;
+	}
+
+	const float f_ratio = f_end / fmaxf(f_start, 0.1f);
+
+	return sinf(M_TWOPI_F * f_start * duration * (powf(f_ratio, t / duration) - 1.f) / logf(f_ratio));
+}
+
+} /* namespace signal_generator */