When you start or need to start this event on Mars????
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There are 3 spots where the warsats drop. The area you first load into on patrol, to your right at the big cabal base and around at the vex city. Use an event timer as a guide and add a few minutes to each stakeout. It is easy enough to get from one area to another in time. Or grab a friend to help out.
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Same as all public events, it happens when enough time has past. There's nothing that can speed it up, but I recommend that you have another person in your fireteam so you can check multiple locations at a time.