Abstract: Embodiments of the present disclosure disclose a phase-locked loop, a radar system and a method for randomizing initial phases of FMCW signals. The phase-locked loop includes a phase-locked loop circuit and a random control signal generator. In response to a clock signal indicating a respective target moment of one or more target moments, the random control signal generator inputs a random control signal to the phase-locked loop circuit, so that the accumulated value of the plurality of fractional frequency division values is converted into a random value, and that a plurality of phase differences respectively corresponding to the plurality of chirp signals form a non-arithmetic sequence.

Abstract: A character input method and device based on an arrow key are provided. The method of the present invention includes: querying a letter database according to triggering of a arrow key and obtaining a letter set corresponding to the arrow key; arranging the letter set corresponding to the arrow key according to a predetermined rule, and partially or fully spreading and then displaying the letter set in a display region; displaying a selection cursor at a default position in the display region, where the selection cursor is used for identifying a currently selected letter; and inputting the letter identified by the selection cursor into a character input region according to a predetermined selection rule. Embodiments of the present invention are mainly applied to a character input process based on an arrow key.

Abstract: A character input method and device based on an arrow key are provided. The method of the present invention includes: querying a letter database according to triggering of a arrow key and obtaining a letter set corresponding to the arrow key; arranging the letter set corresponding to the arrow key according to a predetermined rule, and partially or fully spreading and then displaying the letter set in a display region; displaying a selection cursor at a default position in the display region, where the selection cursor is used for identifying a currently selected letter; and inputting the letter identified by the selection cursor into a character input region according to a predetermined selection rule. Embodiments of the present invention are mainly applied to a character input process based on an arrow key.