Design of Roll Rate Estimator using GPS Signal for Spinning Vehicle

Abstract

The present paper proposes a method that can estimate a roll rate of spinning vehicles utilizing GPS receivers. The proposed method analyzes a relation between received signal and correlation value and utilizes a phenomenon that received signal power that changes according to a signal incident direction affects a correlation value. That is, a roll-rate estimation method using zero crossing detection method for correlation value, which has sinusoidal periodicity according to rotations of vehicles, is proposed. A correlation value in real environments experiences a jitter so that the proposed method includes a preprocessing filter and detection threshold setting way is also considered to reduce the effect of received signal power. In order to verify the operation of the proposed method and analyze the performance, a signal generator and software-defined receiver (SDR) are designed. The signal generator generates intermediate frequency (IF) signal by taking the rotation of vehicles, antenna gain, and signal power into consideration, and a correlation value is acquired by taking the generated IF signals into consideration. Using the generated correlation value, the operation of the proposed roll rate estimation method is verified and the performance is analyzed.

Estimation of Low Rotation Frequency Based on Doppler Shift Observations

“…The rotational attitude is estimated by analyzing the energy relationship between the received signal and the phase center of the antenna. Kim et al [18] and Lee et al [19] analyzed the carrier phase and carrier frequency bias induced by rotation and estimated the rotation frequency using the I and Q correlated summations of the correlators. Although the methods above can solve the problems of inter-antenna signal interference and reduce the mechanical structure complexity of the system, which are the key factors that affect performance of rotational attitude estimation by multi-antenna measurement.…”

Roll Angle Measurement for a Spinning Vehicle Based on GPS Signals Received by a Single-Patch Antenna

“…There are several kinds of GPS-based attitude determining methods, such as the carrier phase-based [7,8], amplitude-based [9,10], and SNR (Signal-to-noise ratio)-based methods, for coarse attitude determination [11]. GPS receivers on guided projectiles normally provide the guidance computer with information of position and velocity.…”