Political analysts say the launch, which would violate U.N. resolutions on the heavily sanctioned state, is aimed at boosting the legitimacy of its young new ruler Kim Jong-un who inherited power after his father's death in December.
"The peaceful development and use of space is a universally recognized legitimate right of a sovereign state," the North's state KCNA news agency said.
North Korea says it is using the rocket to launch a satellite to mark the 100th anniversary of the birth of Kim Il-sung, the country's founding ruler and grandfather of the current ruler.
The United States, and others, say it is much the same as a ballistic missile test and therefore off-limits for the isolated state which has for years been trying to build a nuclear arsenal.
Washington, which last month agreed to supply North Korea with food in exchange for a suspension of nuclear tests, missile launches and uranium enrichment and to allow nuclear inspectors into the country, called the planned launch "highly provocative". more