A 3-D Attitude Measurement Method using Spread Spectrum Modulated Ultrasonic Wave

Iwasawa, Hiroyuki; Takayama, Jun-ya; Ohyama, Shinji

doi:10.1109/sice.2006.314763

Cited by 6 publications

(5 citation statements)

References 3 publications

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“…The system uses a transmitter tag and a receiver detector and the positioning method operates in a fashion similar to RFID while benefitting from the shielding provided by room walls to ultrasonic signals, the proposed system provides proximity sensing but does not provide the actual 3D position. The use of a broadband ultrasonic signal was also considered in [24], [25], [26], [27]. Both Direct Sequence Spread Spectrum modulation [25], [26], [27] and Frequency Hop Spread Spectrum (FHSS) modulation [24] have been investigated for use in ultrasonic location estimation.…”

Section: Related Workmentioning

confidence: 99%

“…The use of a broadband ultrasonic signal was also considered in [24], [25], [26], [27]. Both Direct Sequence Spread Spectrum modulation [25], [26], [27] and Frequency Hop Spread Spectrum (FHSS) modulation [24] have been investigated for use in ultrasonic location estimation. In [28], it was shown that FHSS provides better accuracy than both conventional narrowband pulses and DSSS modulation in terms of noise and multi-path interference immunity.…”

Section: Related Workmentioning

confidence: 99%

See 1 more Smart Citation

High-Accuracy Reference-Free Ultrasonic Location Estimation

Saad

Bleakley

Ballal

et al. 2012

IEEE Trans. Instrum. Meas.

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Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

High-Accuracy Reference-Free Ultrasonic Location Estimation

Saad

Bleakley

Ballal

et al. 2012

IEEE Trans. Instrum. Meas.

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“…In ref. [9] and [10], BPSK modulation was used to construct the transmission signals of ultrasonic system. But they adopted different codes to modulate, i.e., Alvarez et al [9] used complementary sequences codes and Iwasawa et al [10] applied M sequence.…”

Section: Introductionmentioning

confidence: 99%

“…[9] and [10], BPSK modulation was used to construct the transmission signals of ultrasonic system. But they adopted different codes to modulate, i.e., Alvarez et al [9] used complementary sequences codes and Iwasawa et al [10] applied M sequence. The chaotic codes [11][12][13][14] with good correlation characteristic were exploited to construct the ultrasonic emission signals.…”

Section: Introductionmentioning

confidence: 99%

Crosstalk Elimination Method Based on Chaotic Binary Amplitude Shift Keying

Yao¹,

Li²,

Li³

2016

Advanced Science and Technology Letters

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The important indicators of multichannel ultrasonic ranging system are correlation characteristics and energy efficiency. The excitation sequences with good correlation characteristics can help avoid crosstalk among multichannel ultrasonic sensors. High energy efficiency can enhance measurement range. This paper proposes a crosstalk elimination method by using the optimal binary excitation sequences modulated with chaotic codes, which include chaotic binary amplitude shift keying (c-BASK), chaotic binary phase shift keying (c-BPSK) and chaotic binary frequency shift keying (c-BFSK). To obtain the both best correlation characteristics and energy efficiency, the Non-dominated Sorting Genetic Algorithm-II (NSGA-II) is applied to optimize the chaotic binary excitation sequences. Real experiments have been conducted using an ultrasonic ranging system that consists of eight-channel SensComp 600 series instrument-grade electrostatic sensors excited with chaotic binary modulation sequences. The experimental results show that the c-BFSK outperforms the c-BASK and c-BPSK in terms of the correlation characteristics and energy efficiency. With 2 ms c-BFSK excitation sequences, the longest measurable distance was 720 cm (i.e., increased 11% and 27% with c-BPSK and c-BASK, respectively) with maximal relative error 2.4%.

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“…Iwasawa et al put forward a method using spread spectrum modulation technology to expand the scope that the band wave transmitter works, in order to solve data congestion problem in the same wave band and improve data transmission capacity. Still, this method is sensitive to distance, for signal will weaken as the distance between the transmitter and receiver increases [8]. Vlasic et al pointed out that there is too much noise in ultrasonic wave band which would affect the accuracy [9].…”

Section: Introductionmentioning

confidence: 99%

Research on posture recognition based on Kalman filter and quaternion

Lai

Liu

Wang

et al. 2012

2012 International Conference on System Science and Engineering (ICSSE)

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The accuracy of quaternion method in strap-down inertial navigation used for posture recognition is subjected to sensor data drift. Analysis shows that quaternion is a state variable in discrete time linear constant system. A method based on Kalman filter to correct the error is proposed. Recursive calculations on state variables can effectively reduce system error. Experiments show that this method significantly increases the accuracy of posture recognition.

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A 3-D Attitude Measurement Method using Spread Spectrum Modulated Ultrasonic Wave

Cited by 6 publications

References 3 publications

High-Accuracy Reference-Free Ultrasonic Location Estimation

High-Accuracy Reference-Free Ultrasonic Location Estimation

Crosstalk Elimination Method Based on Chaotic Binary Amplitude Shift Keying

Research on posture recognition based on Kalman filter and quaternion

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