CC1310距离测试报告
Hi all
谁有进行过CC1310的demo板或者自己制作的CC1310模块板的外场距离测试吗？我这边急需一份距离测试报告进行评估。
谢谢！
实际在马路上拉过距离。433M，长距离模式，625bps, 外置天线，1.5Km, 连续100包，不丢包。
官方有个距离评估工具，可以参考
https://e2e.ti.com/support/wireless_connectivity/proprietary_sub_1_ghz_simpliciti/f/156/t/375556
The attached excel sheet helps to estimate a practical range estimation for indoor and outdoor radio links.
The outdoor is based upon Line-of-Sight (LOS). For the indoor estimation, construction materials can be selected that are between the Tx and Rx unit. The greater the attenuation of the combined material between the Tx and Rx unit, the shorter the distance.
This has been used a lot in TI seminars and is a helpful tool for calculating a realistic and conservative range expectation.
Latest version (1.17) has been updated to include:
- CC2640R2F - 500 kbps (BLE)
- CC2640R2F - 125 kbps (BLE)
| There are many factors that can cause poor range. In order to determine the root cause, please follow the guidelines shown below to debug the root cause: | |||
| Calculate the theoretical range: | |||
| 1 | Read | "Achieving Optimum Range" describes the important parameters so realistic values are entered in the range spreadsheet. | |
| 2 | Calculate line-of-sight (LOS) range in the spreadsheet with your radio settings | ||
| - | output power | ||
| - | selection of chip and datarate | ||
| - | height of antennas above ground | ||
| - | operating frequency | ||
| 3 | Are there any objects between the LOS of the transmitter and receiver ? | ||
| - | If so, add a suitable absorbtion material that can represent the object blocking the LOS. | ||
| 4 | Choose an antenna gain that is realistic for your product | ||
| - | For example: achieving 100% efficiency for handheld device at 433 MHz will never occur. Typical efficiency would be -4 dBi for a good 433 MHz antenna for a handheld product. | ||
| If the range is not meeting the expected distance then the root cause needs to be determined: | |||
| Poor range could be caused by one or more of the following factors: | |||
| - | Poor sensitivity in the receiver | ||
| - | Poor Tx output power | ||
| - | Poor antenna | ||
| The measurement methods will depend on what type of equipment is available. | |||
| 5 | Measure the conducted sensitivity | ||
| - | Disconnect the antenna and perform conducted measurements at the SMA connector or solder a semi-rigid cable at the 50 ohm point. | ||
| - | Preferred: use a signal generator that is capable to send data packets. If the signal generator cannot send data packets then just send preamble data. | ||
| If a signal generator is not available, then use an EM with attenuation between the EM SMA connector and the antenna connector on the customer board. | |||
| - | It is difficult to get accurate numbers using this method since the exact values of output power and attenuation are not known. | ||
| - | Some energy will also travel over the air from the EM so placing the receiver in a metal box to shield it will give more accurate results. | ||
| - | If the conducted sensitivity is poor: | ||
| - | Are the settings the same as the recommended values in SmartRF studio? | ||
| - | Is the schematic according to the reference design? | ||
| - | Is the layout according to the reference design? | ||
| 6 | Measure the conducted output power | ||
| - | Disconnect the antenna and perform conducted measurements at the SMA connector or solder a semi-rigid cable at the 50 ohm point. | ||
| - | Preffered: use a spectrum analyzer (MSP-SA430 or similar does not have the required accuracy) | ||
| - | If a SA is not available, then use an EM or LaunchPad with a SMA connection point. | ||
| - | Add a known RF attenuation block between the transmiter's SMA connector and the EM / LaunchPad connector. | ||
| - | Use SmartRF Studio and set the EM / LaunchPad in continuous RX, and read the RSSI. | ||
| - | If the conducted power is poor: | ||
| - | Is the schematic according to the reference design? | ||
| - | Is the layout according to the reference design? | ||
| 7 | Measure the antenna. If the sensitivity and output power are as expected and the range is poor compared to the theoretical range the antenna efficiency is most likely poor. | ||
| - | Preffered: use a network analyzer (VNA) to accurately tune the antenna. | ||
| - | Disconnect the radio and add a semi-rigid cable / SMA connector at the 50 ohm point towards the antenna matching network and antenna. | ||
| - | Compensate the semi-rigid cable or SMA with port extensions so they are not included in the antenna measurements. | ||
| - | Always measure the antenna in the final casing otherwise the tuning will be invalid. | ||
| - | Always measure the antenna as would be used in the application. If the device is placed on a metal shelf, then the tuning must be made in a similiar environment. | ||
| - | Measure the resonance of the antenna and make sure the matching is better than VSWR 2. | ||
| - | If the resonance is not correct or the matching is greater than VSWR 2, then the antenna design needs to be reviewed again. | ||
| - | If measurements with a VNA is not possible then use an EM or LaunchPad with an known good antenna. | ||
| - | Measure the resonance frequency by sweeping the frequency of the transmitter and measure which frequency the receiver reads the highest RSSI. | ||
| - | If the antenna is poor: | ||
| - | Is the antenna matching network same as the antenna reference design? | ||
| - | Is the antenna layout according to a known antenna reference design? | ||
| 8 | If you still are having problems with range then contact TI via the E2E and we can assist furthermore. The inital response will always request for the above measurements in order to debug your case. | ||
楼主对通信传输速率和距离以及环境有啥要求?
Hi Johnson，
我做过很多测试，你能具体描述一下你的配置和环境吗？我帮你估一下。
你好，AZ
CC1310 LaunchPAD开发板，868MHZ，14dB 空旷环境的距离测试。我上周末在深圳湾公园测了下，400m是不丢包的极限距离。
关键还要看你的速率。50kbps吗？
不丢包我没测过。
我测试过干扰，在868MHz，干扰的底噪由于GSM系统的泄露，干扰电平还是挺大的。所以，很难测到灵敏度等级。
我一般是按照1%的BER测试。payload二十个byte的话，折合下来PER=1-（1-BER）^26=23%。
我用我们的long range mode 5kbps，深圳湾433MHz不带PA，大概可以测到2km。我有模块第三方，加了个33dBm的PA，可以到5公里。
long range mode 5kbps，但是smart rf里面好像默认是625bps，无法修改，smart版本2.5
最新SmartRF Studio 2.6.0, Long range mode 给了三个速率的配置参考
http://www.ti.com/tool/SMARTRFTM-STUDIO?keyMatch=smartrf%20studio&tisearch=Search-EN-Everything
