Ultrasonic Arrays for Localized Presence Sensing

Caicedo, David; Pandharipande, Ashish

doi:10.1109/jsen.2011.2161667

Cited by 32 publications

(18 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The transmitter sends out periodic pulsed sinusoids [8], [9], with an active transmission duration of T s and pulse repetition interval being T p . The transmitted signal can be written as a real-valued bandpass signal with center frequency f c,1 as…”

Section: A Transmitted Waveformmentioning

confidence: 99%

“…The duration of the pulsed sinusoid is chosen as T s = 4 ms, so as to provide a reasonable range resolution of 0.68 m [8]. In order to guarantee unambiguous range measurements, a quiet period has to be scheduled so that echoes from the environment die before the transmission of the next pulsed sinusoid and sufficiently large to sense over the required range.…”

Section: B Practical Design Considerationsmentioning

confidence: 99%

“…Therefore, the difference signal only contains N 1 (t) components. Assuming that the environment characteristics and the speed of the objects caused by each component are constant over a scan, the gain difference of the nth echo component, β m,n (t +T p )−β m,n (t), can be zero for certain blind speeds [8], underlying the need for tracking so as not to lose track of occupant movements.…”

Section: Moving Target Indicator Processingmentioning

confidence: 99%

“…Traditional passive infrared sensors [7] only provide binary occupancy information and cannot localize users. An ultrasonic array sensor when operated in pulsed mode can provide range as well as angular information [8]- [10]. Ultrasonic linear array sensors were considered for localized presence sensing [8] in a wall-mounted configuration.…”

mentioning

confidence: 99%

“…An ultrasonic array sensor when operated in pulsed mode can provide range as well as angular information [8]- [10]. Ultrasonic linear array sensors were considered for localized presence sensing [8] in a wall-mounted configuration. Under a ceiling-mounted configuration, which is typical in indoor lighting control applications, these sensors were proposed for improved presence detection [9] and one-dimensional zoning [10].…”

mentioning

confidence: 99%

See 4 more Smart Citations

Indoor Granular Presence Sensing and Control Messaging With an Ultrasonic Circular Array Sensor

et al. 2015

Self Cite

View full text Add to dashboard Cite

Abstract-Providing automated granular control of lighting, along with user-driven control, results in an energy-efficient smart lighting system design while catering to personal occupant preferences. Two functional ingredients in such a system are: 1) sensing that provides granular information on occupant location and 2) a communication system to transmit control messages from a user. In this paper, we consider an ultrasonic circular array sensor that provides the dual functionality of granular occupant sensing and a communication receiver for user control transmissions. A ceiling-mounted sensor configuration with a colocated ultrasonic transmitter and array receiver is considered. To perform presence sensing, this transmitter sends periodic bursts of sinusoidal pulses that, upon reflection from the environment, are received at the array sensor. The echoes are processed to obtain estimates of range, azimuth, and elevation angles corresponding to possible occupant movements. A Kalman filter based on a near constant velocity model is used for target tracking. The resulting occupant location is used for energy-efficient lighting control. A user may in addition control lamps in its vicinity by sending messages at ultrasonic frequency, which are processed by the receiver array, and used to further adapt requested parameters of the lighting system. The proposed sensing and messaging solution is tested in an indoor office space with an eight-element receiver array sensor prototype.

show abstract

Section: A Transmitted Waveformmentioning

confidence: 99%

Section: B Practical Design Considerationsmentioning

confidence: 99%

Section: Moving Target Indicator Processingmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Indoor Granular Presence Sensing and Control Messaging With an Ultrasonic Circular Array Sensor

et al. 2015

Self Cite

View full text Add to dashboard Cite

show abstract

Using implicit user feedback to balance energy consumption and user comfort of proximity-controlled computer screens

Garcia

Gonzalez

Amft

2014

J Ambient Intell Human Comput

View full text Add to dashboard Cite

This paper presents a dynamically adaptive proximity controller (APC) to balance energy consumption and user comfort of computer screens in office environments. Our APC system detects desk activities, such as working with the computer screen (screen on) and being away (screen off) and controls screens accordingly. Ultrasound range (USR) sensors were used to measure user proximity. To compensate for USR measurement errors, APC timing parameters were dynamically adapted and previous screen switch-off operations corrected using implicit user feedback. The feedback was obtained from proximity variance increases due to user movement following erroneous control operations. System performance and user comfort were evaluated in a real-life intervention study with 12 participants during 19 days. Detection accuracy was up to 98 %. Energy savings of up to 21 % were obtained by comparing intervention and baseline measurements. User responses showed that the APC system could yield energy savings, while maintaining user comfort when assessed using pre-and post-intervention questionnaires. The implicit feedback control is suitable to reduce system commissioning effort.

show abstract