更新Firebase Real Time Ionic 3中的位置

Question

我有一个表用户外观

  

用户   
Id |名字|电子邮件|纬度|经度

我想更新在Firebase中实时定位此用户，我是用户方法WatchPosition，但如何实时更新位置，请按照我在TS中的代码

addPosition() {
let watch = this.geolocation.watchPosition();
watch.subscribe((data) => {

  this.myPosition = new google.maps.LatLng(data.coords.latitude, data.coords.longitude);

      this.mapOptions = {
        zoom: 19,
        center: this.myPosition,
        disableDefaultUI: true
      }

      this.map = new google.maps.Map(document.getElementById('map'), this.mapOptions);
      this.directionsDisplay.setMap(this.map);

      this.addMarker(this.myPosition);

      const request = {
            // Pode ser uma coordenada (LatLng), uma string ou um lugar
            origin: this.myPosition,
            // origin: new google.maps.LatLng(data.coords.latitude, data.coords.longitude),
            destination: new google.maps.LatLng('-1.376040', '-48.435644'),
            travelMode: 'DRIVING'
          };
          this.traceRoute(this.directionsService, this.directionsDisplay, request);
      })
 }