Doughty has signed until the end of the season while Andrade will be with League One's bottom club for another month.
Doughty told the official website, "I'm very happy to sign for the rest of the season as I have been enjoying the regular football that I've been getting here.
"Whilst I've still got a lot to learn, the manager has been good to me and is helping me to understand the improvements that I need to make. I'm confident that the more games I play, the better player I'll become.
"The league position doesn't reflect the performances that we've been putting in recently. For the remainder of the season I hope to continue improving and play a big part in helping the team climb the table."