Position calculation method and device for wireless positioning based on multisystem combined measurement

The invention discloses a position calculation method and a device thereof based on the joint survey of a multi-system, which overcomes the problem of lack in the number of the base station in the current position survey of a single system. The technical scheme of the invention is that: the method comprises procedures as follows: calculating the corresponding downlink signal arrival time difference for each system relative to each reference cell; calculating a correct value of the corresponding downlink signal arrival time difference for each system relative to each reference cell; obtaining a mobile phone position estimation X=(x, y, z) by using an optimization manner, an optimization equation being as shown as below, wherein X0 is the reference cell base station position of the j th system, Xi is the i th cell base station position of the j th system, Wj is a weighing value directly proportional to the surveyed downlink signal receiving intension of the i th cell base station of the j th system, w is a weighing value inversely proportional to the signal chip/symbol duration time of the j th system; the Euclidean distance being shown as below, wherein N is the quantity of the non-reference cell of the j th system; Ns is the quantity of the system and c is the velocity of light. The position calculation method and device provided by the invention are applicable to the filed of wireless location.