Research On GNSS Positioning Method For Spinning Single Patch Antenna And Discontinuous Signal Received

For some two-dimension Trajectory Correction Fuze requires both measuring projectile trajectory(position, speed) and the need to measure projectile roll attitude, using GNSS receiver with single patch antenna mounted on the side of the projectile, satellite signals can be used to extract roll attitude, if at the same time to achieve positioning function, it will be able to use only one receiver while achieving positioning and roll attitude measurement, and this is important in saving volume and cost. It is advantageous for the receiver measuring roll attitude that to use single patch antenna mounted on the side of the projectile to receive discontinuous satellite signals. But conventional baseband and navigation solution methods can not achieve normal positioning in this condition.This paper analyzes the impact on conventional satellite navigation receiver caused by the single antenna rotation and discontinuous signals received condition, studies GNSS positioning methods without bit and frame synchronization, establishes a GNSS positioning model for this condition by adding a coarse-time error state quantity, and qualitative analysis of the model error factors shows the model positioning accuracy compared to the case of satellite signal lasts visible to indeed lower, but it still can meet the application requirements. Then the proposed positioning method is realized in a hardware receiver and several experiments are conducted to validate the method. The software-defined receiver based outdoor mechanically-rotating fixture tests validate the positioning method capable of achieving positioning when the rotating speed is less than 40r/s. The spinning-projectile onboard flight tests further validate the method can achieve positioning with single patch antenna under rocket carrier environment, and single frequency GPS single point absolute positioning accuracy is about 20 meters, the method has practical application feasibility. And the hardware-based emulator onboard receiver rotation scene HILS(Hardware-in-the-Loop Simulation) experiments verify the correctness of the real time algorithm.