Abstract:  In order to reduce the influence of complex environment for lunar exploration on navigation and to improve the reliability of libration point navigation constellation，a receiver autonomous integrity monitoring method of lunar surface based on multiple hypothesis separation solutions（MHSS）is proposed.This method takes advantage of the gravity asymmetry in cislunar space and realizes the user-level integrity monitoring of lunar surface by using the measurement information from only three libration point satellites.To meet the number requirement of visible satellites in more areas of the far side of the Moon for integrity monitoring，the number of Halo orbit satellites around L2 is increased and the amplitudes and initial phases of Halo are optimized by multipopulation genetic algorithm.Finally，the MHSS algorithm is used to verify the feasibility of integrity monitoring based on three satellites.The simulations show that fault detection is realized under the condition of two visible satellites，and that fault detection of the planar short-period orbit satellite is easier.Results also show that fault exclusion is realized under the condition of three visible satellites，and that fault detection and exclusion rate begin to rise to 100% when fault deviation reaches up to between 20σ and 30σ（σ=1m）.The feasibility of integrity monitoring based on libration point navigation constellation is analyzed for the first time and a method is proposed.The method can be applied to the navigation of lunar exploration missions and provides a useful reference for the design of both integrity monitoring algorithm and libration point navigation constellation for lunar exploration missions in the future.

Key words:  , navigation constellation；integrity；separation solutions；libration point；multiple population genetic algorithm