diff --git a/component/train.go b/component/train.go
index 95db636..42c72b1 100644
--- a/component/train.go
+++ b/component/train.go
@@ -30,6 +30,15 @@ func (t *TrainPositionInfo) ToString() string {
 type TrainBaliseTelegram struct {
 	BaliseId string //应答器ID
 	Telegram []byte //一个应答器同一时刻只有一条报文处于激活有效状态
+	sent     bool   //true-已经向车载ATP发送过
+}
+
+func NewTrainBaliseTelegram(baliseId string, telegram []byte) *TrainBaliseTelegram {
+	return &TrainBaliseTelegram{
+		BaliseId: baliseId,
+		Telegram: telegram,
+		sent:     false,
+	}
 }
 
 // TrainBtm 列车应答器传输模块
@@ -44,10 +53,57 @@ type TrainBtm struct {
 	AboveBalise bool
 	//列车在运行方向顺序扫描到的应答器
 	ScannedBalises []*TrainBaliseTelegram
+	//最近经过的应答器id
+	viaBaliseId string
 }
 
-func (t *TrainBtm) Scanning(aboveBalise bool, tbt *TrainBaliseTelegram) {
+// 应答器计数器加1，[0,255]
+func (t *TrainBtm) baliseCounterAdd1() {
+	t.BaliseCounter++
+	if t.BaliseCounter > 255 {
+		t.BaliseCounter = 0
+	}
+}
+
+// 报文计数器加1，[0,255]
+func (t *TrainBtm) baliseMessageCounterAdd1() {
+	t.MessageCounter++
+	if t.MessageCounter > 255 {
+		t.MessageCounter = 0
+	}
+}
+
+const scannedBalisesMax = 3
+
+// Scanning BTM通过车载应答器天线接收到应答器报文
+func (t *TrainBtm) Scanning(aboveBalise bool, aboveBaliseId string, telegram *TrainBaliseTelegram) {
 	t.AboveBalise = aboveBalise
+	//BTM此时在一个新的应答器上方
+	if t.AboveBalise && t.viaBaliseId != aboveBaliseId {
+		t.viaBaliseId = aboveBaliseId
+		t.baliseCounterAdd1()
+	}
+	//
+	if telegram == nil {
+		return
+	}
+	//过滤掉同一个应答器
+	for _, tbt := range t.ScannedBalises {
+		if tbt.BaliseId == telegram.BaliseId {
+			return
+		}
+	}
+	//一个新的应答器的报文
+	if len(t.ScannedBalises) < scannedBalisesMax {
+		t.ScannedBalises = append(t.ScannedBalises, telegram)
+	} else {
+		//move left
+		for i := 1; i < scannedBalisesMax; i++ {
+			t.ScannedBalises[i-1] = t.ScannedBalises[i]
+		}
+		t.ScannedBalises[scannedBalisesMax-1] = telegram
+	}
+	t.baliseMessageCounterAdd1()
 }
 
 var (
diff --git a/sys/device_sys/balise_detection.go b/sys/device_sys/balise_detection.go
index 47511d0..b33e40f 100644
--- a/sys/device_sys/balise_detection.go
+++ b/sys/device_sys/balise_detection.go
@@ -33,7 +33,11 @@ func (s *BaliseDetectSystem) Update(w ecs.World) {
 		detectedBalise := s.detect(wd, tp, balises)
 		//列车应答器天线扫描到应答器,获取应答器报文发送给BTM
 		tbt := s.findBaliseTelegram(wd, detectedBalise)
-		btm.Scanning(detectedBalise != nil, tbt)
+		var detectedBaliseId string
+		if detectedBalise != nil {
+			detectedBaliseId = detectedBalise.Id()
+		}
+		btm.Scanning(detectedBalise != nil, detectedBaliseId, tbt)
 	})
 }
 
@@ -47,7 +51,7 @@ func (s *BaliseDetectSystem) findBaliseTelegram(wd *component.WorldData, detecte
 	if baliseEntry != nil {
 		baliseState := component.BaliseStateType.Get(baliseEntry)
 		if len(baliseState.ValidTelegram) > 0 {
-			return &component.TrainBaliseTelegram{BaliseId: detectedBalise.Id(), Telegram: baliseState.ValidTelegram}
+			return component.NewTrainBaliseTelegram(detectedBalise.Id(), baliseState.ValidTelegram)
 		}
 	} else {
 		slog.Warn(fmt.Sprintf("应答器[%s]实体不存在", detectedBalise.Id()))