diff --git a/Models/MissileBase.cs b/Models/MissileBase.cs
index 6eceee6..3ec1080 100644
--- a/Models/MissileBase.cs
+++ b/Models/MissileBase.cs
@@ -322,7 +322,7 @@ namespace ActiveProtect.Models
                    $"  距离目标: {missileRunningState.DistanceToTarget:F2}\n" +
                    $"  发动机工作时间: {missileRunningState.EngineBurnTime:F2}/{MaxEngineBurnTime:F2}\n" +
                    $"  有引导: {(missileRunningState.HasGuidance ? "是" : "否")}\n" +
-                   $"  失去引导时间: {missileRunningState.LostGuidanceTime:F2}";
+                   $"  失去引导时间: {missileRunningState.LostGuidanceTime:F2}\n";
         }
 
         /// <summary>
diff --git a/Models/Sensors.cs b/Models/Sensors.cs
index 3d5c50d..82354ee 100644
--- a/Models/Sensors.cs
+++ b/Models/Sensors.cs
@@ -152,14 +152,14 @@ namespace ActiveProtect.Models
     public class MillimeterWaveRadiometer : Sensor
     {
         /// <summary>
-        /// 工作频率
+        /// 工作频率（3mm 或 8mm）
         /// </summary>
         public double Frequency { get; set; }
 
         /// <summary>
-        /// 灵敏度
+        /// 辐射温度差检测阈值，辐射计高温物体与低温物体的检测温差，单位K，默认 50K
         /// </summary>
-        public double Sensitivity { get; set; }
+        public double DetectionTemperatureDifferenceThreshold { get; set; } = 50;
 
         /// <summary>
         /// 构造函数
@@ -167,12 +167,12 @@ namespace ActiveProtect.Models
         /// <param name="position">辐射计的位置</param>
         /// <param name="orientation">辐射计的朝向</param>
         /// <param name="frequency">工作频率</param>
-        /// <param name="sensitivity">灵敏度</param>
-        public MillimeterWaveRadiometer(Vector3D position, Orientation orientation, double frequency, double sensitivity)
+        /// <param name="detectionTemperatureDifferenceThreshold">辐射检测阈值</param>
+        public MillimeterWaveRadiometer(Vector3D position, Orientation orientation, double frequency, double detectionTemperatureDifferenceThreshold)
             : base(position, orientation)
         {
             Frequency = frequency;
-            Sensitivity = sensitivity;
+            DetectionTemperatureDifferenceThreshold = detectionTemperatureDifferenceThreshold;
         }
 
         /// <summary>
diff --git a/Models/TerminalSensitiveSubmunition.cs b/Models/TerminalSensitiveSubmunition.cs
index dda2cd5..e2f6e80 100644
--- a/Models/TerminalSensitiveSubmunition.cs
+++ b/Models/TerminalSensitiveSubmunition.cs
@@ -39,8 +39,8 @@ namespace ActiveProtect.Models
         // 攻击速度 500 m/s 
         private const double AttackSpeed = 500;
 
-        // 是否检测到目标
-        private bool targetDetected;
+        // 检测到目标的时间
+        private double? lastDetectionTime = null;
 
         /// <summary>
         /// 螺旋角度
@@ -66,7 +66,6 @@ namespace ActiveProtect.Models
         {
             currentStage = SubmunitionStage.Separation;
             spiralAngle = 0;
-            targetDetected = false;
             detectionAngle = 0;
             
             // 初始化传感器
@@ -164,11 +163,9 @@ namespace ActiveProtect.Models
         private void UpdateSpiralScanStage(double deltaTime)
         {
             GuidanceAcceleration = Vector3D.Zero;
-            Velocity = new Vector3D(0, -VerticalDescentSpeed, 0);
             
-            // 螺旋扫描
-            spiralAngle %= (2 * Math.PI);
-            spiralAngle += SpiralRotationSpeed * deltaTime;
+            // 更新螺旋角度
+            spiralAngle = (spiralAngle + SpiralRotationSpeed * deltaTime) % (2 * Math.PI);
 
             // 计算水平速度分量
             double horizontalSpeed = VerticalDescentSpeed * Math.Tan(ScanAngle);
@@ -179,7 +176,7 @@ namespace ActiveProtect.Models
             );
 
             // 更新速度
-            Velocity = new Vector3D(horizontalVelocity.X, -VerticalDescentSpeed, horizontalVelocity.Z);
+            Velocity = new(horizontalVelocity.X, -VerticalDescentSpeed, horizontalVelocity.Z);
 
             // 计算扫描方向
             Vector3D scanDirection = new(
@@ -191,18 +188,27 @@ namespace ActiveProtect.Models
             if (DetectTarget(scanDirection))
             {
                 Console.WriteLine("检测到目标");
-                if (!targetDetected)
+                double currentTime = SimulationManager.CurrentTime; 
+                if (lastDetectionTime == null)
                 {
-                    targetDetected = true;
-                    detectionAngle = spiralAngle;
+                    lastDetectionTime = currentTime;
                 }
-                else if (Math.Abs(spiralAngle - detectionAngle) < 0.1) // 允许一定的误差
+                 else
                 {
-                    currentStage = SubmunitionStage.Attack;
+                    double timeSinceLastDetection = currentTime - lastDetectionTime.Value;
+                    // 重新检测到目标的时间大于等于螺旋周期的90%，则二次确认目标
+                    if (timeSinceLastDetection >= 0.9 * 2 * Math.PI / SpiralRotationSpeed)
+                    {
+                        Console.WriteLine($"目标确认，进入攻击阶段。距离上次检测时间：{timeSinceLastDetection:F2}秒");
+                        currentStage = SubmunitionStage.Attack;
+                        return;
+                    }
                 }
             }
 
-            if (((AltimeterSensorData)altimeter.GetSensorData()).Altitude <= SelfDestructHeight)
+            // 使用模式匹配简化类型转换
+            if (altimeter.GetSensorData() is AltimeterSensorData altimeterData && 
+                altimeterData.Altitude <= SelfDestructHeight)
             {
                 currentStage = SubmunitionStage.SelfDestruct;
             }
@@ -273,7 +279,7 @@ namespace ActiveProtect.Models
         /// <returns>子弹状态</returns>
         public override string GetStatus()
         {
-            return $"{base.GetStatus()}\nSubmunition Stage: {currentStage}\nDetection Angle: {detectionAngle * 180 / Math.PI:F2}°\nSpiral Angle: {spiralAngle * 180 / Math.PI:F2}°\nTarget Detected: {targetDetected}";
+            return $"{base.GetStatus()}\nSubmunition Stage: {currentStage}\nDetection Angle: {detectionAngle * 180 / Math.PI:F2}°\nSpiral Angle: {spiralAngle * 180 / Math.PI:F2}°\nTarget Detected: {lastDetectionTime != null}";
         }
     }
 }