Evaluation of the weighted least square based Receiver Autonomous Integrity Monitoring (RAIM) for single frequency GNSS receivers

Single frequency receivers for Global Navigation Satellite System (GNSS) are low-cost and easily accessible, deeming them cost-effective commercial applications requiring localization tracking. However, the positioning solution these provide must conform to desired reliability standards. A check is essential in signal-degraded environment, where a position fix might be unacceptably inaccurate. Under such conditions, faulty measurements need identified excluded ensure system's integrity get reliable solution. In this paper, Receiver Autonomous Integrity Monitoring (RAIM) scheme devised that employs different tests. The first test performs global sweep on all epochs raises alarm after detecting fault. Next, group of tests performed identify satellite responsible producing measurements. Once identified, it then from maintain provided by receiver. results indicate polling based multiple identifies correctly minimizes false rate if either individually.