In a same direction scenario, how is the target speed calculated when the target is slower?

In a same direction scenario where the target is moving slower than the patrol vehicle, the target speed (TS) is calculated by subtracting the closing speed (CS) from the patrol speed (PS), then divided by the speed of sound (SS). This formula stems from the need to determine the effective speed of the target relative to the observer.

When both vehicles are moving in the same direction, the target contributes less to the distance covered between them. The closing speed represents the rate at which the distance between the patrol vehicle and the target is decreasing. Therefore, to find the actual speed of the target, it's essential to adjust the patrol speed downward by the closing speed.

Thus, the correct calculation reflects that since the target is slower, the effective speed needs to decrease in relation to the patrol speed. This adjustment ensures an accurate understanding of the target's movement in relation to the stationary observer or patrol vehicle.