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US 8,559,549 B2Granted
Burst oscillation device, burst oscillation method, and ranging/communication system
AssigneeFurukawa Electric Co., Ltd.
InventorYasushi Aoyagi
Life of this patent
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Abstract
The burst oscillation device 20 includes the data generation part 21, the operation part 11, the signal selecting part 40 and the burst generation part 50. The generation part 21 outputs the encoded data encoded based on data for communication. At the signal selecting part 40, the pulse release timing of predetermined repetition period is randomly delayed by the PPM and further delayed randomly by the minimal time by means of the PSK modulation, thereby realizing the decreasing of the peak value of the average power spectral density.
Claims19
A burst oscillation device comprising:
- a data generation part;
- an operation part configured to generate a trigger signal with a predetermined repetition period;
- a modulation signal generating part configured to receive data from the data generation part, generate a first delay time signal corresponding to a first delay time having a time length calculated by multiplying a predetermined minimum delay time by an integer determined based on the data, and generate a second delay selection signal indicating whether or not to apply a second delay time having a time length shorter than the predetermined minimum delay time based on the data;
- a pulse position modulating (PPM) part configured to receive the first delay time signal and the trigger signal from the modulation signal generating part and the operation part respectively, and release the trigger signal at a release timing delayed by the first delay time based on the first delay time signal to output a PPM modulated trigger signal;
- a phase shift keying (PSK) part configured to receive the second delay selection signal and the PPM modulated trigger signal from the modulation signal generating part and the PPM part respectively, and adjust the release timing of the PPM modulated trigger signal by selecting whether or not to apply the second delay time to the release timing of the PPM modulated trigger signal based on the second delay selection signal to output a PSK modulated trigger signal;
- and
- a burst generation part including an oscillator and configured to receive the PSK modulated trigger signal from the PSK part and output a burst signal by making the oscillator to oscillate based on the PSK modulated trigger signal.
4 more elements
A burst oscillation method comprising:
- generating a trigger signal with a predetermined repetition period;
- generating a first delay time signal corresponding to a first delay time having a time length calculated by multiplying a predetermined minimum delay time by an integer determined based on an input data, and
- generating a second delay selection signal indicating whether or not to apply a second delay time having a time length shorter than the predetermined minimum delay time based on the input data;
- pulse position modulating (PPM) the trigger signal by releasing the trigger signal at a release timing delayed by the first delay time based on the first delay time signal;
- phase shift keying (PSK) modulating the PPM modulated trigger signal by adjusting the release timing of the PPM modulated trigger signal by selecting whether or not to apply the second delay time to the release timing of the PPM modulated trigger signal based on the second delay selection signal;
- and
- outputting a burst signal by oscillating an oscillator based on the PSK modulated trigger signal, the burst signal having a natural frequency of the oscillator as a center frequency thereof.
4 more elements
Dependencies are inferred from the claim text.