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Deprecated: Using null as the key parameter for array_key_exists() is deprecated, use an empty string instead in /var/www/html/plugins/system/t4/src/t4/MVC/Router/T4.php on line 388
蓝牙和UWB在定位方面的优缺点以及未来技术发展趋势 - bluetooth蓝牙技术
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一、核心特性对比   特性蓝牙(特别是BLE 5.1+)超宽带(UWB) 定位原理 主要依靠接收信号强度指示(RSSI),高级版本支持到达角(AoA)和离开角(AoD)。 主要通过计算无线电波飞行时间(ToF) 或到达时间差(TDoA)。 精度 米级(RSSI: 1-5米,受环境影响大);亚米级(AoA/AoD: 0.1-0.5米)。 厘米级(10-30厘米),极高精度。 实时性 较高(毫秒到秒级),但通常低于UWB。 极高(可达毫秒级),实时跟踪能力强。 功耗 低功耗,特别适合电池供电的物联网设备。 中等功耗,高于BLE,但通过优化已可用于手机、标签等。 成本 低,芯片成熟且高度集成,生态庞大。 较高,但正在快速下降,芯片逐渐普及。 抗干扰能力 较弱(2.4GHz频段拥挤,易受Wi-Fi、微波炉等同频设备干扰)。 极强(占用极宽频谱,功率谱密度低,类似“背景噪音”,难以干扰)。 穿透能力 一般,对非金属障碍物穿透性尚可。 较强,对多数非金属材料(如墙壁、玻璃)穿透性好。 主要应用场景 资产标签、室内导航、 proximity服务(如寻物)、智能家居。 数字钥匙(车、门)、高价值资产跟踪、人员精确定位、AR/VR交互。 二、优缺点总结蓝牙定位的优点:生态与成本优势:几乎所有智能设备都内置蓝牙,部署和用户端成本极低。低功耗:电池可续航数月甚至数年,适合大规模布设标签。技术成熟:协议栈完善,开发相对简单,易于集成到现有系统中。兼顾通信与定位:在完成定位的同时,可以进行数据传输。...

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Deprecated: Using null as the key parameter for array_key_exists() is deprecated, use an empty string instead in /var/www/html/libraries/CBLib/CB/Legacy/cbPluginHandler.php on line 323

Deprecated: Using null as the key parameter for array_key_exists() is deprecated, use an empty string instead in /var/www/html/libraries/CBLib/CB/Legacy/cbPluginHandler.php on line 323

Deprecated: Using null as an array offset is deprecated, use an empty string instead in /var/www/html/libraries/src/Menu/AbstractMenu.php on line 164

Deprecated: Using null as an array offset is deprecated, use an empty string instead in /var/www/html/libraries/CBLib/CB/Legacy/LegacyFoundationFunctions.php on line 217

Deprecated: Using null as an array offset is deprecated, use an empty string instead in /var/www/html/libraries/CBLib/CB/Legacy/LegacyFoundationFunctions.php on line 219

Deprecated: Using null as an array offset is deprecated, use an empty string instead in /var/www/html/libraries/CBLib/CB/Legacy/LegacyFoundationFunctions.php on line 227

Deprecated: Using null as an array offset is deprecated, use an empty string instead in /var/www/html/libraries/CBLib/CB/Legacy/LegacyFoundationFunctions.php on line 231

Deprecated: Using null as an array offset is deprecated, use an empty string instead in /var/www/html/libraries/CBLib/CB/Legacy/LegacyFoundationFunctions.php on line 234

Deprecated: Using null as an array offset is deprecated, use an empty string instead in /var/www/html/libraries/CBLib/CB/Legacy/LegacyFoundationFunctions.php on line 237

Deprecated: Using null as an array offset is deprecated, use an empty string instead in /var/www/html/libraries/CBLib/CB/Legacy/LegacyFoundationFunctions.php on line 239

Deprecated: Method ReflectionProperty::setAccessible() is deprecated since 8.5, as it has no effect since PHP 8.1 in /var/www/html/plugins/system/falangdriver/falangdriver.php on line 100

Deprecated: Method ReflectionProperty::setAccessible() is deprecated since 8.5, as it has no effect since PHP 8.1 in /var/www/html/plugins/system/falangdriver/falangdriver.php on line 100
mysqli object is already closed (500 Whoops, looks like something went wrong.)

Error

HTTP 500 Whoops, looks like something went wrong.

mysqli object is already closed

Exception

Error

  1. */
  2. public function disconnect()
  3. {
  4. // Close the connection.
  5. if (\is_callable([$this->connection, 'close'])) {
  6. $this->connection->close();
  7. }
  8. parent::disconnect();
  9. }
  1. */
  2. public function disconnect()
  3. {
  4. // Close the connection.
  5. if (\is_callable([$this->connection, 'close'])) {
  6. $this->connection->close();
  7. }
  8. parent::disconnect();
  9. }
  1. *
  2. * @since 2.0.0
  3. */
  4. public function __destruct()
  5. {
  6. $this->disconnect();
  7. }
  8. /**
  9. * Alter database's character set.
  10. *
DatabaseDriver->__destruct()

Stack Trace

Error
Error:
mysqli object is already closed

  at /var/www/html/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:318
  at mysqli->close()
     (/var/www/html/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:318)
  at Joomla\Database\Mysqli\MysqliDriver->disconnect()
     (/var/www/html/libraries/vendor/joomla/database/src/DatabaseDriver.php:496)
  at Joomla\Database\DatabaseDriver->__destruct()                

Deprecated: Method ReflectionProperty::setAccessible() is deprecated since 8.5, as it has no effect since PHP 8.1 in /var/www/html/plugins/system/falangdriver/falangdriver.php on line 100

Deprecated: Method ReflectionProperty::setAccessible() is deprecated since 8.5, as it has no effect since PHP 8.1 in /var/www/html/plugins/system/falangdriver/falangdriver.php on line 100