diff --git a/app/build.gradle b/app/build.gradle
index 219ce47..806ba8a 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -20,8 +20,8 @@
         applicationId "com.casic.detector"
         minSdkVersion 22
         targetSdkVersion 33
-        versionCode 5020
-        versionName "5.0.2"
+        versionCode 5030
+        versionName "5.0.3"
 
         ndk {
             moduleName "serial_port"

diff --git a/app/build.gradle b/app/build.gradle
index 219ce47..806ba8a 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -20,8 +20,8 @@
         applicationId "com.casic.detector"
         minSdkVersion 22
         targetSdkVersion 33
-        versionCode 5020
-        versionName "5.0.2"
+        versionCode 5030
+        versionName "5.0.3"
 
         ndk {
             moduleName "serial_port"
diff --git a/app/src/main/java/com/casic/detector/widgets/RadarScanView.kt b/app/src/main/java/com/casic/detector/widgets/RadarScanView.kt
index ff268ad..abbacd9 100644
--- a/app/src/main/java/com/casic/detector/widgets/RadarScanView.kt
+++ b/app/src/main/java/com/casic/detector/widgets/RadarScanView.kt
@@ -15,7 +15,6 @@
 import android.graphics.Typeface
 import android.text.TextPaint
 import android.util.AttributeSet
-import android.util.Log
 import android.view.View
 import com.casic.detector.R
 import com.pengxh.kt.lite.extensions.dp2px
@@ -50,6 +49,9 @@
     //需要渲染的数据点集合
     private var points: ArrayList<PointF>? = null
 
+    //距离最近的点
+    private var targetPoint: PointF? = null
+
     //View中心X坐标
     private var centerX = 0f
 
@@ -328,6 +330,11 @@
             canvas.drawCircle(it.x, it.y, 8f, dataPaint)
         }
 
+        //画最近的点最外层圆环
+        targetPoint?.apply {
+            canvas.drawCircle(x, y, 10f, borderPaint)
+        }
+
         /**
          * 上下翻转画布，否则矩阵旋转是逆时针，因为手机等设备Y轴和生活中的坐标轴Y轴是反的
          * */
@@ -355,42 +362,36 @@
     fun renderPointData(dataPoints: ArrayList<DataPoint>) {
         points = ArrayList()
         dataPoints.forEach {
-            Log.d(kTag, "renderPointData => [${it.angle}, ${it.distance}]")
-            //转为弧度
-            val dataAngle = (it.angle * Math.PI / 180).toFloat()
-
-            //距离最大3米，表盘最大125dp，需要转换
-            //TODO 距离转换有问题
-            val d = (it.distance / 3) * 125
-            val dataDistance = recursionDistance(d.dp2px(context))
-
-            //计算实际圆心坐标
-            val x = dataDistance * cos(dataAngle)
-            val y = dataDistance * sin(dataAngle)
-
-            points?.add(PointF(x, y))
+            points?.add(it.convertPointF())
         }
+
+        //计算出附近最近的点
+        dataPoints.sortBy(DataPoint::distance)
+
+        //在最近的点外侧绘制同心圆
+        targetPoint = dataPoints.first().convertPointF()
+
         //实时刷新点位数据
         invalidate()
     }
 
     /**
+     * dataPoint转为PointF
+     * */
+    private fun DataPoint.convertPointF(): PointF {
+        val dataAngle = (this.angle * Math.PI / 180).toFloat()
+        //距离最大3米，表盘最大125dp，需要转换
+        //TODO 距离转换有点问题
+        val dataDistance = this.distance * (30 / 125f)
+        val x = dataDistance * cos(dataAngle)
+        val y = dataDistance * sin(dataAngle)
+        return PointF(x, y)
+    }
+
+    /**
      * 数据点
      * @param angle 数据点和圆心的方位角
      * @param distance 数据点和圆心的相对距离
      * */
     data class DataPoint(val angle: Int, val distance: Int)
-
-    /**
-     * 递归计算周期性距离
-     * */
-    private fun recursionDistance(distance: Int): Int {
-        return if (distance <= 0) {
-            0
-        } else if (distance >= radius) {
-            radius
-        } else {
-            distance
-        }
-    }
 }
\ No newline at end of file