Kalman Filter Trend is an advanced trend-following indicator for cTrader that provides a smooth and highly responsive trend line with minimal lag compared to traditional moving averages. It continuously updates its estimate of the true price by mathematically balancing smoothness and responsiveness, adapting to market volatility in its Adaptive mode, and modeling both price and velocity in its 2D mode.

The indicator offers three modes: Simple1D for fast, short-term trend detection; PositionVelocity2D for modeling price and trend velocity, suitable as a directional filter in algorithmic strategies; and Adaptive1D, which adjusts automatically to volatility for smoother or more reactive behavior depending on market conditions.

Key parameters include Process Noise (Q) controlling trend reaction speed versus smoothness, Measurement Noise (R) affecting data trust and smoothing, and Adaptive Strength for volatility sensitivity in Adaptive1D mode.

Users interpret the indicator by trend direction (uptrend, downtrend, flat), entry signals based on price crossing and slope changes, and trend strength via slope magnitude in 2D mode. It supports various practical uses such as trend-follow strategies, multi-timeframe analysis, and integration into automated trading systems, particularly for indices and volatile markets.