AlarmManager没有每隔一段时间精确调用BroadcastReceiver

我有以下内容 BroadcastReceiver :

public class LocationUpdateReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        LocationHelper locationHelper = new LocationHelper(context);
        locationHelper.updateLocation();

        //.. do stuff with location

    }

    public static void SetAlarm(Context context, Long time){
        Intent intentAlarm = new Intent(context, LocationUpdateReceiver.class);
        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        PendingIntent pi = PendingIntent.getBroadcast(context, 1, intentAlarm, PendingIntent.FLAG_UPDATE_CURRENT);
        alarmManager.setRepeating(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime(), time, pi);
    }

    public static void CancelAlarm(Context context) {
        Intent intent = new Intent(context, LocationUpdateReceiver.class);
        PendingIntent sender = PendingIntent.getBroadcast(context, 1, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        alarmManager.cancel(sender);
    }
}

我像这样调用setAlarm方法来测试活动: LocationUpdateReceiver(位置更新接收器)。设置警报(此,3000L);

你会注意到我打电话 setRepeating() 我以为应该每3秒钟调用一次接收器类?

问题是,通常情况下,它在超过5分钟的时间内没有呼叫接收器,这是一个很大的偏差。我打算每30分钟运行一次接收器,但我是否应该期望偏差时间的相对百分比?

我如何才能确保它会被精确地(或以非常小的偏差)调用到我指定的间隔?