Creating GPS indoors

Hello, I hope you are well. I am looking to commission an array of GPS units that emulate the standard GPS. This is to provide positioning service indoors and underground in a large open space. Can you help with something like this? Kindest regards, Mike *Mike Bishop* Operations Director Spider UAS Operations Ltd CAA Authorised UAV Operator M: 07801 450 392 ***SHOWREEL*** <http://t.sidekickopen08.com/e1t/c/5/f18dQhb0S7lC8dDMPbW2n0x6l2B9nMJW7t5XZs4XHmCPMfDgQ-QsxsKVRYyc856dWrDf3M_r6M02?t=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D1wdgcrh21j0&si=5154207558008832&pi=9deceed5-3cf5-42ce-cdec-3a915e566f2d> E: Mike(a)spideraerialfilming.com W: spideraerialfilming.com W: dronebuilders.co.uk Instagram: Spider_Drone <http://t.sidekickopen08.com/e1t/c/5/f18dQhb0S7lC8dDMPbW2n0x6l2B9nMJW7t5XZs4XHmCPMfDgQ-QsxsKVRYyc856dWrDf3M_r6M02?t=http%3A%2F%2Fwww.instagram.com%2Fspider_drone%2F&si=5154207558008832&pi=9deceed5-3cf5-42ce-cdec-3a915e566f2d>