Phase correcting apparatus and method of transmission signal of vehicle radar, and vehicle radar apparatus with the same
The present disclosure relates to a phase correcting apparatus and method of the transmission signal of the vehicle radar apparatus and vehicle radar apparatus with the same. The present embodiments may provide, in the vehicle radar apparatus including the plurality of transmission channels for simultaneously transmitting transmission signals, the phase correcting apparatus and the vehicle radar apparatus for determining the phase adjustment value at the first transmission time based on a source transmission signal applied to the phase shifter included in each transmission channel and a distortion transmission signal extracted from the coupler included in each transmission channel, and compensating the phase of the target detection transmission signal transmitted at a subsequent second transmission time point based on the phase adjustment value. According to the present embodiments, it is possible to improve the quality of the radar reception signal and increase the accuracy of the target information.
1. A phase correcting apparatus of a transmission signal included in a vehicle radar apparatus including a plurality of transmission channels for simultaneously transmitting the transmission signal comprising:
a source transmission signal extractor configured to extract a source transmission signal which is a reference signal at a first transmission time;
a distortion transmission signal extractor configured to extract a distortion transmission signal with a phase distortion immediately before being sent to a transmission antenna at the first transmission time;
a phase adjustment value determiner configured to determine a phase adjustment value based on the source transmission signal and the distortion transmission signal at the first transmission time; and
a phase corrector configured to correct a phase of a target detection transmission signal using the phase adjustment value at a second transmission time following the first transmission time,
wherein the source and the distortion transmission signal at the first transmission time maintain a steady frequency and the target detection transmission signal is a frequency modulated signal.
2. The phase correcting apparatus of the transmission signal of claim 1 , wherein the phase adjustment value determiner calculates a phase representative value based on the phase of the source transmission signal and the phase of the distortion transmission signal, and determines the phase representative value as the phase adjustment value.
3. The phase correcting apparatus of the transmission signal of claim 2 , wherein the phase adjustment value determiner calculates the phase representative value based on the phase of the source transmission signal and the phase of the distortion transmission signal acquired from the source transmission signal at a specific temperature or a specific frequency, and determines the phase representative value as the phase adjustment value corresponding to the specific temperature or the specific frequency.
4. The phase correcting apparatus of the transmission signal of claim 2 , wherein the first transmission time includes a plurality of transmission times within a period of the first transmission time, and the phase adjustment value determiner determines an average of a difference between the phase of the source transmission signal and the phase of the distortion transmission signal calculated at the plurality of transmission times as the phase representative value.
5. The phase correcting apparatus of the transmission signal of claim 1 , wherein the source transmission signal extractor extracts the source transmission signal from an input signal of a phase shifter included in each transmission channel of the vehicle radar apparatus, and the distortion transmission signal extractor extracts the distortion transmission signal from a coupler included in each transmission channel of the vehicle radar apparatus.
6. A vehicle radar apparatus comprising:
a transmitter including a plurality of transmission channels for simultaneously transmitting a same transmission signal;
a receiver including a receiving antenna for receiving a reception signal reflected from a target;
a signal processor configured to process the reception signal received from the receiving antenna to acquire target information; and
a transmission signal phase correcting apparatus configured to correct a phase of a target detection transmission signal at a second transmission time by determining a phase adjustment value based on a source transmission signal extracted prior to being input into the transmitter and a distortion transmission signal extracted in a stage of the transmitter immediately before being sent to a transmission antenna at a first transmission time for each transmission channel included in the plurality of transmission channels,
wherein the source and the distortion transmission signal maintain a steady frequency and the target detection transmission signal is a frequency modulated signal.
7. The vehicle radar apparatus of claim 6 , wherein each transmission channel included in the plurality of transmission channels includes a phase shifter, a coupler, and the transmission antenna, and
wherein the transmission signal phase correcting apparatus extracts the source transmission signal from an input signal of the phase shifter, and extracts the distortion transmission signal from the coupler.
8. The vehicle radar apparatus of claim 6 , wherein the transmission signal phase correcting apparatus calculates a phase representative value based on the phase of the source transmission signal and the phase of the distortion transmission signal, and determines the phase representative value as the phase adjustment value.
9. The vehicle radar apparatus of claim 8 , wherein the transmission signal phase correcting apparatus calculates the phase representative value based on the phase of the source transmission signal and the phase of the distortion transmission signal acquired from the source transmission signal at a specific temperature or a specific frequency, and determines the phase representative value as the phase adjustment value corresponding to the specific temperature or the specific frequency.
10. The vehicle radar apparatus of claim 8 , wherein the first transmission time includes a plurality of transmission times within a period of the first transmission time, and the transmission signal phase correcting apparatus determines an average of a difference between the phase of the source transmission signal and the phase of the distortion transmission signal calculated at the plurality of transmission times as the phase representative value.
11. The vehicle radar apparatus of claim 6 , wherein the transmission signal phase correcting apparatus comprises:
a source transmission signal extractor for extracting the source transmission signal at the first transmission time;
a distortion transmission signal extractor for extracting the distortion transmission signal with a phase distortion at the first transmission time;
a phase adjustment value determiner for determining the phase adjustment value based on the source transmission signal and the distortion transmission signal at the first transmission time; and
a phase corrector for correcting a phase of the target detection transmission signal using the phase adjustment value at the second transmission time following the first transmission time.
12. A phase correcting methods of a transmission signal in a vehicle radar apparatus including a plurality of transmission channels for simultaneously transmitting the transmission signal comprising:
extracting a source transmission signal which is a reference signal at a first transmission time;
extracting a distortion transmission signal with a phase distortion immediately before being sent to a transmission antenna at the first transmission time;
determining a phase adjustment value based on the source transmission signal and the distortion transmission signal at the first transmission time; and
correcting a phase of a target detection transmission signal using the phase adjustment value at a second transmission time following the first transmission time,
wherein the source and the distortion transmission signal at the first transmission time maintain a steady frequency and the target detection transmission signal is a frequency modulated signal.
13. The phase correcting method of the transmission signal of claim 12 , wherein determining the phase adjustment value includes calculating a phase representative value based on the phase of the source transmission signal and the phase of the distortion transmission signal, and determining the phase representative value as the phase adjustment value.
14. The phase correcting method of the transmission signal of claim 13 , wherein determining the phase adjustment value includes calculating the phase representative value based on the phase of the source transmission signal and the phase of the distortion transmission signal acquired from the source transmission signal at a specific temperature or a specific frequency, and determining the phase representative value as the phase adjustment value corresponding to the specific temperature or the specific frequency.
15. The phase correcting method of the transmission signal of claim 13 , wherein the first transmission time includes a plurality of transmission times within a period of the first transmission time, and determining the phase adjustment value includes determining an average of a difference between the phase of the source transmission signal and the phase of the distortion transmission signal calculated at the plurality of transmission times as the phase representative value.
16. The phase correcting method of the transmission signal of claim 12 , wherein extracting the source transmission signal includes extracting the source transmission signal from an input signal of a phase shifter included in each transmission channel of the vehicle radar apparatus, and extracting the distortion transmission signal includes extracting the distortion transmission signal from a coupler included in each transmission channel of the vehicle radar apparatus.