Honeywell International Inc.

Chinese Academy of Sciences

Minghui Chen

Ming Jin Chen

Jie Chen

Li Zhou

Zhenning Zhou

Kai Tian

Kunyu Wang

Pi-Shien Liu

Wenjing Xu

Chengbin Zhang

Zhijian Xu

Mei Tian

A quantizer for a sigma-delta modulator, a sigma-delta modulator, and a method of shaping noise are provided. The quantizer includes: an integrator configured to generate, in a Ksampling period, a quantization error signal for a Kperiod according to an internal signal, a quantization error signal for a (K&#x2212;1)period, a filtered quantization error signal for the (K&#x2212;1)period and a filtered quantization error signal for a (K&#x2212;2)period; an integrating capacitor configured to store the quantization error signal for the Kperiod, to weight the internal signal in a (K+1)sampling period; a passive low-pass filter configured to acquire the quantization error signal for the Kperiod in a Kdischarge period, and feed back the filtered quantization error signal to the integrator in a (K+1)sampling period and a (K+2)sampling period; and a comparator configured to quantize the quantization error signal for the Kperiod.

Quantizer for sigma-delta modulator, sigma-delta modulator, and noise-shaped method

In one embodiment, a method is provided. The method includes selecting, with a communications management system, a first satellite communications (SATCOM) system of a plurality of SATCOM systems as a primary SATCOM system based on user input, received by a human machine interface, that identifies the first SATCOM system as a user-selected SATCOM system. The method further includes automatically switching, with the communications management system, the primary SATCOM system from the first SATCOM system to a second SATCOM system of the plurality of SATCOM systems in response to: a fault status for the first SATCOM system; a loss of channel availability for the first SATCOM system; and/or a failed datalink message transmission for the first SATCOM system. The method further includes establishing a communication link between the primary SATCOM system and a ground station.

Systems and methods for simultaneous operation of dissimilar SATCOM systems

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Beijing, China

Minghui Chen