US 12,332,337 B2
Radar velocity measurement system and method and radar device thereof
Hong-Lun Chen, Hsinchu County (TW); and Yu-Wang Hu, Hsinchu County (TW)
Assigned to CUBTEK INC., Zhubei (TW)
Filed by CUBTEK INC., Hsinchu County (TW)
Filed on Apr. 18, 2022, as Appl. No. 17/722,790.
Claims priority of application No. 110134733 (TW), filed on Sep. 17, 2021.
Prior Publication US 2023/0086601 A1, Mar. 23, 2023
Int. Cl. G01S 13/58 (2006.01); G01S 13/32 (2006.01); G01S 13/44 (2006.01)
CPC G01S 13/589 (2013.01) [G01S 13/32 (2013.01); G01S 13/4454 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A radar velocity measurement system, comprising:
a radar module comprising a transmission antenna and a receive antenna, the transmission antenna transmitting an electromagnetic wave signal, the electromagnetic wave signal being orderly formed of a first sub-signal and a second sub-signal; a time of transmitting a single first sub-signal and a single second sub-signal being defined as a transmission cycle, the transmission cycle being orderly formed of a first transmission time of the first sub-signal and a second transmission time of the second sub-signal, and the first transmission time being different from the second transmission time; the receive antenna receiving an echo signal of the electromagnetic wave signal reflected by a target object, wherein the radar module comprises a supplementary transmission antenna, which transmits a supplementary electromagnetic wave signal whose transmission cycle is identical to the transmission cycle of the electromagnetic signal; the supplementary electromagnetic signal comprises a first supplementary sub-signal, and the first supplementary sub-signal is transmitted at the first transmission time simultaneously with the first sub-signal, wherein the first supplementary sub-signal has different phases in two neighboring transmission cycles; and
a signal processor electrically connected with the radar module, the signal processor comprising a sequence unit, a conversion unit, and a compare calculation unit that are coupled with each other; the sequence unit establishing an even number receive sequence with a plurality of the first sub-signals, and establishing an odd number receive sequence with a plurality of the second sub-signals according to the echo signal; the conversion unit carrying out a time domain to frequency domain conversion upon the even number receive sequence and the odd number receive sequence, so as to generate a first reflection signal and a second reflection signal, respectively; the compare calculation unit comprising a comparison model, the compare calculation unit using the comparison model to carry out a comparison with a phase difference between the first reflection signal and the second reflection signal, thereby obtaining a true reflection frequency.