This psalm is a prayer for help. Parallelism is common in Hebrew poetry. (See: [[rc://en/ta/man/translate/writing-poetry]] and [[rc://en/ta/man/translate/figs-parallelism]])
Here God's name represents his character. It may represent specifically his power or his justice. Alternate translation: "Save me, God, by your power" (See: [[rc://en/ta/man/translate/figs-metonymy]])
Judging David here represents showing people that David is not guilty. When God uses his might to save David, people will know that God has judged him as not guilty. Alternate translation: "In your might, show people that I am not guilty" or "Show people that I am not guilty by using your power to rescue me" (See: [[rc://en/ta/man/translate/figs-metonymy]])