GNSS RADIO OCCULTATION (RO) DATA ARE A MAJOR CONTRIBUTOR FOR CLIMATE MODELING WEATHER FORECASTING AND IONOSPHERIC MONITORING. AN IMPORTANT OBSERVABLE IN GNSS RO MEASUREMENT IS THE SIGNAL CARRIER PHASE. HOWEVER CARRIER PHASE TRACKING IS THE WEAK LINK IN GNSS RECEIVER SIGNAL PROCESSING ESPECIALLY FOR RO SIGNALS PROPAGATING THROUGH LOWER TROPOSPHERIC STRUCTURES AND IONOSPHERIC PLASMA IRREGULARITIES. OPEN LOOP (OL) TRACKING HAS BEEN ADOPTED BY MOST RO CONSTELLATIONS INCLUDING SPIRE GLOBAL CUBESATS TO IMPROVE THE ROBUSTNESS OF THE CARRIER PHASE ESTIMATION PROCESS. A MAJOR PITFALL OF THE OL TRACKING IS THE HIGH NOISE LEVEL AND CARRIER CYCLE SLIPS WHICH LEAD TO BIAS AND ERRORS IN RETRIEVED TROPOSPHERIC AND IONOSPHERIC PROFILES. THIS PROPOSED EFFORT WILL APPLY THE LATEST TECHNIQUES DEVELOPED BY THE PROPOSAL TEAM TO DETECT AND MITIGATE THE CARRIER PHASE ESTIMATION NOISE AND CYCLE SLIPS TO THE GNSS RO DATA OBTAINED BY SPIRE GLOBAL CUBESATS. THE RESULTS WILL BE USED TO ESTABLISH PATTERNS OF CYCLE SLIP BEHAVIOR AND THE ATMOSPHERIC OR IONOSPHERIC CONDITIONS UNDER WHICH CYCLE SLIP OCCURS. IMPROVEMENTS IN TROPOSPHERIC AND IONOSPHERIC PROFILES RETRIEVED FROM THE SPIRE CUBESAT DATA AFTER APPLICATION OF THE CYCLE SLIP MITIGATION METHODS WILL BE QUANTIFIED. FINALLY THE PROCESSING RESULTS WILL BE ANALYZED IN CONJUNCTION WITH COSMIC 2 DATA COLLECTED IN THE VICINITY OF SPIRE DATA AT SIMILAR TIMES TO EVALUATE THE QUALITY OF THE SPIRE MEASUREMENTS. THE RESULTS WILL OFFER A COMPREHENSIVE ASSESSMENT OF THE FEASIBILITY OF LOW-COST SMALL SATELLITE CONSTELLATIONS AS A SOURCE FOR GLOBAL TROPOSPHERE AND IONOSPHERE REMOTE SENSING AND FOR ENABLING HIGH ACCURACY EARTH AND SPACE SCIENCES APPLICATIONS.