Apparatus and method for detecting target
An apparatus for detecting a target is disclosed. The apparatus of detecting a target includes: a frequency mixer configured to calculate a first beat frequency based on a transmitted signal and a received signal of first scanning and calculate a second beat frequency based on a transmitted signal and a received signal of second scanning performed with a predetermined time interval from the first scanning; a controller configured to extract a first moving component by comparing an up-chirp period frequency and a down-chirp period frequency of at least one of the first beat frequency or the second beat frequency; extract a second moving component by comparing up-chirp period frequencies or down-chirp period frequencies of the first beat frequency and the second beat frequency; and determine the moving target based on the first moving component and the second moving component.
1. An apparatus for detecting a moving target, the apparatus comprising:
a frequency mixer configured to calculate a first beat frequency based on a transmitted signal and a received signal of first scanning and calculate a second beat frequency based on a transmitted signal and a received signal of second scanning performed with a predetermined time interval from the first scanning; and
a controller configured to:
extract a first moving component by comparing an up-chirp period frequency and a down-chirp period frequency of the first beat frequency; and
extract a second moving component by comparing up-chirp period frequencies or down-chirp period frequencies of the first beat frequency and the second beat frequency; and
determine whether there is the moving target based on the first moving component and the second moving component.
2. The apparatus of claim 1 , wherein the controller is configured to:
calculate a first offset value between the up-chirp period frequency and the down-chirp period frequency;
correct any one of the up-chirp period frequency and the down-chirp period frequency based on the first offset value; and
extract the first moving component by comparing corrected one and non-corrected one of the up-chirp period frequency and the down-chirp period frequency.
3. The apparatus of claim 2 , wherein the controller calculates the first offset value based on a moving speed of the apparatus that performs the first scanning and the second scanning.
4. The apparatus of claim 1 , wherein the controller is configured to:
calculate a second offset value between the first beat frequency and the second beat frequency;
correct any one of the first beat frequency and the second beat frequency based on the second offset value; and
extract the second moving component by comparing corrected one and non-corrected one of the first beat frequency and the second beat frequency.
5. The apparatus of claim 4 , wherein the controller calculates the second offset value based on a moving speed of the apparatus that performs the first scanning and the second scanning and the predetermined time interval.
6. The apparatus of claim 1 , wherein the controller is configured to:
compare the first moving component and a first reference value;
compare the second moving component and a second reference value; and
determine whether there is the moving target based on each comparing result.
7. The apparatus of claim 6 , wherein the first moving component has the same frequency with the second moving component.
8. The apparatus of claim 6 , wherein the controller determines that there is the moving target when the first moving component is larger than the first reference value and the second moving component is larger than the second reference value.
9. The apparatus of claim 6 , wherein the controller determines whether there is the moving target by giving a weight to each comparing result.
10. An apparatus for detecting a moving target, the apparatus comprising:
a frequency mixer configured to calculate a first beat frequency based on a transmitted signal and a received signal of first scanning and calculate a second beat frequency based on a transmitted signal and a received signal of second scanning performed with a predetermined time interval from the first scanning; and
a domain control unit configured to control at least one driver assist system module mounted to a vehicle,
wherein the domain control unit is configured to: extract a first moving component by comparing an up-chirp period frequency and a down-chirp period frequency of the first beat frequency; extract a second moving component by comparing up-chirp period frequencies or down-chirp period frequencies of the first beat frequency and the second beat frequency; and determine whether there is the moving target based on the first moving component and the second moving component.
11. The apparatus of claim 10 , wherein the driver assist system module comprises at least one system selected from a group of an autonomous driving system, a semi-autonomous driving system, an automated parking system, a blind spot detection system, a cross traffic alert system, a lane change and merge aid system, an automatic emergency braking system, a pedestrian detection system, and a turn assist & intersection collision mitigation system.
12. The apparatus of claim 10 , wherein the domain control unit is configured to:
calculate a first offset value between the up-chirp period frequency and the down-chirp period frequency based on a moving speed of the apparatus that performs the first scanning and the second scanning;
correct any one of the up-chirp period frequency and the down-chirp period frequency based on the first offset value; and
extract the first moving component by comparing corrected one and non-corrected one of the up-chirp period frequency and the down-chirp period frequency.
13. The apparatus of claim 10 , wherein the domain control unit is configured to:
calculate a second offset value between the first beat frequency and the second beat frequency based on a moving speed of the apparatus that performs the first scanning and the second scanning and a predetermined time interval;
correct any one of the first beat frequency and the second beat frequency based on the second offset value; and
extract the second moving component by comparing corrected one and non-corrected one of the first beat frequency and the second beat frequency.
14. The apparatus of claim 10 , wherein the domain control unit compares the first moving component and a first reference value, compares the second moving component and a second reference value, and determines whether there is the moving target based on the first moving component and the second moving component that have the same frequency.
15. A method of detecting a moving target, the method comprising:
calculating a first beat frequency based on a transmitted signal and a received signal of first scanning and calculating a second beat frequency based on a transmitted signal and a received signal of second scanning performed with a predetermined time interval from the first scanning;
extracting a first moving component by comparing an up-chirp period frequency and a down-chirp period frequency of at least one of the first beat frequency or the second beat frequency;
extracting a second moving component by comparing up-chirp period frequencies or down-chirp period frequencies of the first beat frequency and the second beat frequency; and
determining whether there is the moving target based on the first moving component and the second moving component.