FusedLocationProviderClient

我使用FusedLocationProviderClient来获取智能手机的速度，但是即使它躺在我办公室的桌子上不动数小时，其速度值有时也会超过20，有时甚至超过100。我相信原因是建筑物中的GPS信号不好？这是我的代码：

locationRequest = new LocationRequest();
locationRequest.setInterval(1000);
locationRequest.setFastestInterval(1000);
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);
locationCallback = new LocationCallback(){
    @Override
    public void onLocationResult(LocationResult locationResult){
        super.onLocationResult(locationResult);

        for(Location location : locationResult.getLocations()){
            if (location != null) {
                    tv_speedField.setText("" + location.getSpeed());
            }
        }
    }
};