This paper investigates the impact of operating a vibratory rate gyro (VRG) at large oscillation amplitude where the VRG's driven axis behaves like a nonlinear oscillator, described by the Duffing equation. Although open-loop resonators operating above a critical amplitude exhibit catastrophic jump instabilities, we demonstrate that through closed-loop operation, the drive axis can be stably operated at an amplitude above this threshold without impacting drive-axis stability or bias instability, resulting in decreased Angle Random Walk (ARW).

This paper concerns a micro-scale gyroscope based on a 1 mm diameter diamond hemispherical resonator with embedded polysilicon electrodes. Frequency mismatch and quality factor of the wineglass vibration modes are studied. The device has embedded electrodes used for electrostatic transduction of resonator vibration and for electrostatic mode-matching. The air gap between the resonator and electrodes is small to increase the frequency tuning range for a given supply voltage. The 2θ-mode resonant frequency mismatch can be minimized from 2.4% to 0.1% by applying a low 2.5V tuning voltage.

We present a 2 mm diameter, 35 μm thick disk resonator gyro (DRG) fabricated in <;111> silicon with integrated 0.35 μm CMOS analog front-end circuits in the Invensense NF process. This process incorporates a wafer-level vacuum seal, yielding a quality factor (Q) of 2800 at the DRG's 78 kHz resonance frequency. After performing electrostatic tuning to enable mode-matched operation, this DRG achieves a 63 μV/°/s sensitivity. Resonator vibration in the sense and drive axes is sensed using capacitive transduction, and amplified using a low-noise, on-chip integrated circuit. This allows the DRG to achieve Brownian noise-limited performance. The angle random walk (ARW) is measured to be 0.01 (*/sec)/√Hz and the bias instability is 30 °/hr.

We present a 0.6 mm diameter, 20 μm thick epitaxially-sealed polysilicon disk resonator gyro (DRG). High Q (50,000) combined with electrostatic mode-matching and closed-loop quadrature null performed by dedicated electrode sets enables a scale-factor of 0.286 mV/(°/s) and Angle Random Walk (ARW) of 0.006 (°/s)/√Hz. Without precise control of temperature, the minimum Allan deviation is 3.29 °/hr.

We demonstrate monolithic integration of a 100-channel arrayed-waveguide grating (AWG) with 10-GHz channel spacing and 100 optically controlled Michelson-interferometer-based phase and amplitude modulators. The high-resolution AWG showed better than -15-dB crosstalk, and the modulator extinction ratio was better than 20 dB with either electrical or optical modulation control. The twin-integrated devices comprise a 50-mm diameter InP wafer with 1200 independent optoelectronic components.

GPS is an accurate navigation system and generally used in civilian or military applications. The performance of GPS receiver is usually degraded by intentional or unintentional RF interference. The jamming signal may cause the navigation error and even saturate the receiver. This paper focuses on the cancellation of narrowband jamming signals in frequency domain. The fast Fourier transform (FFT) translates the received sequence into frequency domain and the excision processing is utilized to remove the jamming signal in the spectrum. The inverse fast W.-L. MAO, T.-H. SU, J. SHEEN and W. H. LIU 196 Fourier transform (IFFT) can reconstruct the time sequence after the jamming excision. The experimental results show that the frequency domain excision is a powerful approach to reject the narrowband interference. After anti-jamming processing, the SNR is improved and navigation data can be obtained successfully. The three main blocks (i.e., FFT, excision and IFFT parts) are implemented effectively on Altera Stratix FPGA EP1S25 F780C5 to accomplish the continuous wave interference (CWI) cancellation.