Abstract: An aircraft recorder system is provided in which a vibration sensor including at least one of a micro-electromechanical systems (MEMS) microphone and a MEMS accelerometer. The system further includes a cockpit voice recorder (CVR) and an active microphone. The active microphone and the vibration sensor each output signals to a signal processor including a subtractor configured to output, to the CVR, a signal that is a result of a subtraction of the signal from the vibration sensor from the signal from the active microphone.

Abstract: A system and method of streaming silence-edited audio data from an aircraft is provided. The European Union Aviation Safety Agency (EASA) has dictated that there needs to be a reliable way to recover data from channels recorded onboard an aircraft. The system and method include a silence editing unit which removes periods of silence from an audio signal and maintains a tracking of the time period during which the silence persists. Information of the time period during which the silence persists is transmitted, along with the silence-edited audio signal, via a streaming satellite signal, to be re-constructed at a reception end.

Abstract: Various communication systems may benefit from the appropriate suppression of unnecessary transmissions. For example, certain position reporting systems may benefit from suppressing transmission of data from position reporting beacons using geographic location. A method can include determining a current position of a vehicle. The method can also include comparing the current position of the vehicle to a position-reporting mask. The method can further include reporting the position of the vehicle conditionally based on the comparison to the mask.

Abstract: Various systems may benefit from appropriate triggers to action. For example, various deployable safety devices, such as emergency locator transmitters and flight recorders, may benefit from a multiple input release mechanism. A method can include identifying the presence of at least one crash indicator. The method can also include performing an analysis of aircraft distress based on aircraft parameters other than the at least one crash indicator to provide an analysis result of aircraft distress. The method can further include triggering the release of a safety device contingent upon the presence of the at least one crash indicator being accompanied by a positive result of aircraft distress.

Abstract: Systems (224, 222, 700) and methods (800) for providing wireless health monitoring for a locator beacon (216). The methods involve: coupling a Transponder and Sensor Module (TSM) to the locator beacon such that at least one condition of the locator beacon or a battery (230) of the locator beacon can be remotely monitored; periodically detecting the condition by the TSM (224); and periodically and wirelessly transmitting, from the TSM to a wireless device (222, 700) located in proximity to the TSM, a signal including information describing the condition detected by the TSM. The TSM can include, but is not limited to a transponder (e.g., an RFID tag) and sensor. The wireless device, can include, but is not limited to a transponder interrogator.

Abstract: Systems (224, 222, 700) and methods (800) for providing wireless health monitoring for a locator beacon (216). The methods involve: coupling a Transponder and Sensor Module (TSM) to the locator beacon such that at least one condition of the locator beacon or a battery (230) of the locator beacon can be remotely monitored; periodically detecting the condition by the TSM (224); and periodically and wirelessly transmitting, from the TSM to a wireless device (222, 700) located in proximity to the TSM, a signal including information describing the condition detected by the TSM. The TSM can include, but is not limited to a transponder (e.g., an RFID tag) and sensor. The wireless device, can include, but is not limited to a transponder interrogator.

Abstract: An accelerometer has an acceleration transducer producing uncorrected analog acceleration signals representing vertical, lateral, and longitudinal components of acceleration. An error correction system is connected to the acceleration transducer for receiving the uncorrected analog acceleration signals. The error correction system includes a system controller for generating a plurality of correction coefficients, an analog to digital converter which converts the uncorrected analog acceleration signals to uncorrected digital acceleration signals, a filter for filtering the uncorrected digital acceleration signals, an error compensation circuit receiving the correction coefficients to compensate the uncorrected digital acceleration signals, and a digital to analog converter which converts the corrected digital acceleration signals to corrected analog acceleration signals. The error compensation circuit corrects for bias offset, cross-axis alignment errors, scaling errors, and thermal offset.

Abstract: An accelerometer has an acceleration transducer producing uncorrected analog acceleration signals representing vertical, lateral, and longitudinal components of acceleration. An error correction system is connected to the acceleration transducer for receiving the uncorrected analog acceleration signals. The error correction system includes a system controller for generating a plurality of correction coefficients, an analog to digital converter which converts the uncorrected analog acceleration signals to uncorrected digital acceleration signals, a filter for filtering the uncorrected digital acceleration signals, an error compensation circuit receiving the correction coefficients to compensate the uncorrected digital acceleration signals, and a digital to analog converter which converts the corrected digital acceleration signals to corrected analog acceleration signals. The error compensation circuit corrects for bias offset, cross-axis alignment errors, scaling errors, and thermal offset.