A joint investigations team "expects to deliver judicial proof" of what type of BUK rocked was used "as well as pinpoint the position from where MH17 was shot down, before the second half of this year," chief investigator Fred Westerbeke said.
All 298 passengers and crew - the majority of them Dutch - died when the plane was shot down with a Russian-made BUK anti-aircraft missile over war-torn eastern Ukraine on July 17, 2014.
A separate criminal investigation is underway by a Dutch-led investigations team which also includes officials from Australia, Belgium, Malaysia and Ukraine.
In a letter to relatives published by Dutch media today, Westerbeke said there were no film or video images of the actual missile launch.
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"There are also no satellite images as a result of cloud cover" on the day over the area in war-ravaged eastern Ukraine, the Dutch Public Prosecution services officer told victims' families.
But Westerbeke wrote that Ukraine did not have the data and that investigators were still "in talks" with Moscow for their primary radar images, while the United States has handed over its radar data.
Investigators "are looking in which form the confidential American information can be used in a criminal investigation," said Westerbeke.
Russian aviation authorities earlier this month told victims' families in a separate letter that they had handed over primary radar data to the OVV and "still keeps the data and is ready to re-submit it to relevant authorised organisations."