AGPS (Assisted GPS, AGPS, network assisted GPS) positioning technique combines the advantages of a cellular base station positioning and GPS positioning, by means of data transmission cellular network, can achieve a high positioning accuracy and fast positioning of the mobile equipment, particularly mobile phones are more and more widely used.
https://blog.csdn.net/niuyong_10086/article/details/51378520
AT command is applied to the terminal device an instruction to the communication connection between the PC and the application. AT command set from a terminal device (Terminal Equipment, TE) or data terminal equipment transmits (Data Terminal Equipment, DTE) to the terminal adapter (Terminal Adapter, TA) or the data circuit-terminating equipment (Data Circuit Terminal Equipment, DCE) is.
https://baike.baidu.com/item/AT%E6%8C%87%E4%BB%A4/6346188
TAU Tracking Area Update (TAU)
https://blog.csdn.net/xrh003/article/details/76577561
Scrambling NB: scrambling code (Scrambling codes) is multiplied by a spread code pseudorandom code sequence, the signal is encrypted. Utilizing WCDMA spreading and scrambling codes to reduce interference between multiple users, the other pair of cell transformation by this cell after scrambling signals like white noise, interference randomization purpose is to make, and the secondary encryption is relatively need.
https://blog.csdn.net/weixin_33928467/article/details/91637895
De-jittered signal:
https://blog.csdn.net/renhaofan/article/details/78848547
Shell Script
https://www.runoob.com/linux/linux-shell.html
if else :https://www.runoob.com/linux/linux-shell-process-control.html
FLASH programming principles are only written as 0 to 1, and not be able to write 0 to 1. So before FLASH programming must be a corresponding block erase, erase process is to put all the bits are written as 1 process, all of the bytes in the block into 0Xff. FALSH basic operations performed by the read, write, and erase operations. (Why 1?)
Due to the nature of Flash, Flash after erasing all the data units are set. Data read operation may be opened
directly after the write data is different, due to the characteristics of Flash data unit can only be pulled down from the high level 1-0 but
not the reverse operation. Therefore, when a write to a flash write operation after block must first be erased.
freertos：configTICK_RATE_HZ
Tick FreeRTOS the frequency of the clock, which is used FreeRTOS timed interrupt generation frequency. The higher the frequency the higher the precision of the timing, but the resulting greater cost. FreeRTOS TickRate comes to a Demo program will only be used to 1000Hz performance test of the kernel. The actual application should be changed as desired small value. When a plurality of tasks share a priority, the kernel scheduler interrupt arrives back after each clock cycle task switching, therefore, lead to higher Tick Rate shorter task time slice.
https://blog.csdn.net/chengde6896383/article/details/69537483
UEFI: UEFI , full name "Unified Extensible Firmware Interface" (Unified Extensible Firmware Interface), is a standard type of interface is described in detail. This interface is used to pre-boot the operating system from automatically operating environment, operating systems loaded on.
https://baike.baidu.com/item/UEFI/3556240