Time-of-flight distance measurement device
AssigneeDenso Corporation
InventorToshiaki Nagai
Life of this patent
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Abstract
In a time-of-flight distance measurement device, a light receiving device is driven by a sequence having a matrix of a phase number n, a value sampled on the basis of the n rank matrix with respect to the phase number n is linearly calculated, and a waveform equivalent to the waveform sampled in a 1/n step is detected. A linear operation is performed on a sampled value based on the matrix with the rank n with respect to the phase number n, thereby being capable of restoring the waveform equivalent to the waveform sampled in the 1/n steps, and determining whether the shape of the light emission waveform is normal, or not. As a result, the shape of the light emission waveform can be monitored without interrupting a distance measurement.
Claims24
A time-of-flight distance measurement device comprising:
- a light emitting device that emits a modulated light toward a space, the modulated light being modulated in a pattern having a repetitive period;
- a light receiving device that distributes a charge to a plurality of storage capacitors to store the charge, the charge corresponding to an incident light including a reflected light obtained by reflecting the modulated light on a target object;
- a control unit controls the light receiving device;
- and
- a signal processing unit that calculates a distance from a subject device to the target object by using a value sampled by the light receiving device, wherein
- the control unit drives the light receiving device according to a sequence having a matrix of a phase number n (n being a natural number);
- and
- the signal processing unit linearly calculates the value sampled by the light receiving device based on a rank n matrix with respect to the phase number n, and detects a waveform equivalent to a waveform sampled at a 1/n step.
A time-of-flight distance measurement device comprising:
- a light emitting device that emits a modulated light toward a space, the modulated light being modulated in a pattern having a repetitive period;
- a light receiving device that distributes a charge to a plurality of storage capacitors to store the charge, the charge corresponding to an incident light including a reflected light obtained by reflecting the modulated light on a target object;
- a control unit controls the light receiving device;
- and
- a signal processing unit that calculates a distance from a subject device to the target object by using a value sampled by the light receiving device, wherein
- the control unit drives the light receiving device according to a sequence having a matrix of a phase number n (n being a natural number);
- and
- the signal processing unit linearly calculates the value sampled by the light receiving device based on a rank (n−1) matrix with respect to the phase number n, and detects a waveform equivalent to a differential waveform sampled at a 1/n step.
Dependencies are inferred from the claim text.