Signal simulator and signal simulation method
A signal simulator and a signal simulation method are provided. A radar signal (electromagnetic wave) is received. The received electromagnetic wave is converted and the converted electromagnetic wave is transmitted. The electromagnetic wave may be converted based on a respiratory cycle. An electromagnetic signal reflected by respiration of a living creature is simulated to easily verify the biosignal sensing performance of a radar device.
1 . A signal simulator, comprising:
a receiver configured to receive an electromagnetic wave transmitted by a vehicular radar sensor;
a converter configured to convert the electromagnetic wave received from the receiver; and
a transmitter configured to transmit the electromagnetic wave converted by the converter to the vehicular radar sensor,
wherein the converter is configured to convert the received electromagnetic wave according to a respiratory cycle as a reflection signal to simulate the reflection signal.
2 . The signal simulator of claim 1 , wherein the converter is configured to convert a frequency of the received electromagnetic wave.
3 . The signal simulator of claim 2 , wherein the converter is configured to convert a wavelength of the received electromagnetic wave.
4 . The signal simulator of claim 2 or claim 3 , wherein the respiratory cycle is 3 to 5 seconds.
5 . The signal simulator of claim 4 , wherein the converter is configured to convert the received electromagnetic wave by increasing or decreasing the frequency or the wavelength of the received electromagnetic wave according to the respiratory cycle.
6 . The signal simulator of claim 5 , wherein the converter is configured to convert the received electromagnetic wave by increasing or decreasing the frequency or the wavelength of the received electromagnetic wave at a cycle which is the respiratory cycle.
7 . The signal simulator of claim 1 , wherein the signal simulator is configured to cyclically convert a wavelength or a frequency of the electromagnetic wave received from the vehicular radar sensor according to the respiratory cycle and radiate the converted electromagnetic wave.
8 . The signal simulator of claim 1 , wherein the signal simulator is configured to simulate and convert a Doppler effect according to respiration of a living creature with respect to the electromagnetic wave received from the vehicular radar sensor and then radiate the converted electromagnetic wave to the vehicular radar sensor.
9 . The signal simulator of claim 8 , wherein, in the simulating, the signal simulator is further configured for:
setting the respiratory cycle of the living creature;
setting a movement speed of a chest of the living creature for a predetermined time interval in the set respiratory cycle;
calculating a wavelength and a frequency of the electromagnetic wave to which the Doppler effect is applied according to the set movement speed of the chest; and
converting an electromagnetic wave received from a radar sensor into an electromagnetic wave having the calculated wavelength and frequency.
10 . A signal simulation method, comprising:
receiving an electromagnetic wave from a vehicular radar sensor;
converting the electromagnetic wave; and
transmitting the converted electromagnetic wave to the vehicular radar sensor,
wherein the converting of the electromagnetic wave includes converting the electromagnetic wave according to a respiratory cycle as a reflection signal to simulate the reflection signal.
11 . The signal simulation method of claim 10 , wherein the converting of the electromagnetic wave includes converting a wavelength of the electromagnetic wave.
12 . The signal simulation method of claim 11 , wherein the converting of the electromagnetic wave includes converting a frequency of the electromagnetic wave.
13 . The signal simulation method of claim 12 , wherein the converting of the electromagnetic wave includes converting the electromagnetic wave by increasing or decreasing the wavelength or the frequency of the electromagnetic wave according to the respiratory cycle.
14 . The signal simulation method of claim 13 , wherein the respiratory cycle is 3 to 5 seconds.
15 . The signal simulation method of claim 14 , wherein the respiratory cycle is a cycle at which the wavelength or the frequency of the electromagnetic wave is increased or decreased.
16 . The signal simulation method of claim 10 , wherein the converting of the electromagnetic wave according to the respiratory cycle includes:
cyclically converting a wavelength or a frequency of the electromagnetic wave received from the vehicular radar sensor according to the respiratory cycle and radiating the converted electromagnetic wave.
17 . The signal simulation method of claim 10 , further including:
simulating and converting a Doppler effect according to respiration of a living creature with respect to the electromagnetic wave received from the vehicular radar sensor and then radiating the converted electromagnetic wave to the vehicular radar sensor.
18 . The signal simulation method of claim 17 , wherein the simulation includes:
setting the respiratory cycle of the living creature;
setting a movement speed of a chest of the living creature for a predetermined time interval in the set respiratory cycle;
calculating a wavelength and a frequency of the electromagnetic wave to which the Doppler effect is applied according to the set movement speed of the chest; and
converting an electromagnetic wave received from a radar sensor into an electromagnetic wave having the calculated wavelength and frequency as the reflection signal to simulate the reflection signal.
19 . A signal simulation method, comprising:
setting a respiratory cycle of a living creature;
setting a movement speed of a chest of the living creature for a predetermined time interval in the set respiratory cycle;
calculating a wavelength and a frequency of an electromagnetic wave to which a Doppler effect is applied according to the set movement speed of the chest; and
converting an electromagnetic wave received from a radar sensor into an electromagnetic wave having the calculated wavelength and frequency as a reflection signal to simulate the reflection signal.