FM-CW radar and method of generating FM-CW signal

A method of generating an FM-CW (frequency modulated continuous waves) signal to be transmitted from an FM-CW radar, the FM-CW radar including:

• high frequency circuitry configured to include a voltage control oscillator generating a frequency-modulated high frequency signal, and signal processing circuitry configured to convert an analog signal generated by the high frequency circuitry into a digital signal and detect at least a distance to a target and velocity of the target, wherein the signal processing circuitry includes a look up table to store default modulation control data, the method including:
• calculating frequency information from phase information of a frequency-divided signal from the voltage control oscillator;
• performing correction processing in response to change to characteristics of the voltage control oscillator by fixing a voltage increment and varying a time increment by using a result of the calculation of the frequency information and then calculating voltage data required to secure linearity of a transmitted frequency;
• and
• updating a value stored in the look up table by using the voltage data calculated in the correction processing.

An FM-CW (frequency modulated continuous waves) radar using frequency modulation based on an FM-CW scheme, the FM-CW radar comprising:

• high frequency circuitry configured to receive a reflected wave from a target;
• and
• signal processing circuitry configured to convert an analog signal generated by the high frequency circuitry into a digital signal and detect at least a distance to the target and velocity of the target, wherein
• the high frequency circuitry includes a voltage control oscillator to generate a frequency-modulated high frequency signal by receiving a modulation voltage from the signal processing circuitry,
• the signal processing circuitry includes a look up table to store default modulation control data, and
• the signal processing circuitry updates data stored in the look up table with correction data that is generated by fixing a voltage increment and varying a time increment with use of frequency information calculated from phase information of an output of the voltage control oscillator, and wherein
• the FM-CW radar does not transmit an FM-CW signal until a first round of updating the look up table is completed by calculating the frequency information and performing correction processing.