RADAR AMBIGUITY RESOLVING DETECTOR

摘要

Various exemplary embodiments relate to a method for determining the velocity of an object using radar system having a processor, including: receiving, by a processor, a first digital signal corresponding to a first transmit signal; receiving, by the processor, a second digital signal corresponding to a second transmit signal; processing the first digital signal to produce a first range/relative velocity matrix; detecting objects in the first range/relative velocity matrix to produce a first detection vector; unfolding the first detection vector; processing the second digital signal to produce a second range/relative velocity matrix; interpolating the second range/relative velocity matrix in the relative velocity direction wherein the interpolated second range/relative velocity matrix has a frequency spacing corresponding to the frequency spacing of the first range/relative range velocity matrix in the relative velocity direction; detecting objects in the second range/relative velocity matrix to produce a second detection vector; unfolding the second detection vector; and determining a true velocity of the detected objects based upon the unfolded first and second detection vectors.

主权项

1. A radar system comprising:
a waveform generator configured to produce a first transmit signal including a first sequence of waveforms and a second transmit signal including a second sequence of waveforms, wherein the first and second transmit signals have different waveform repetition rates and the length of the sequences of the first and second signals is nearly equal; a transmitter configured to transmit the first and second transmit signals; a first receiver comprising:
a first downconverter configured to downconvert the first received signal to produce a first downconverted signal and downconvert the second received signal to produce a second downconverted signal, wherein the first received signal corresponds to the first transmitted signal and the second received signal corresponds to the second transmitted signal; anda first analog to digital converter configured to convert the first downconverted signal to a first digital signal and the second downconverted signal to a second digital signal; a digital signal processor configured to:
process the first digital signal to produce a first range/relative velocity matrix;detect objects in the first range/relative velocity matrix to produce a first detection vector;unfold the first detection vector;process the second digital signal to produce a second range/relative velocity matrix;interpolate the second range/relative velocity matrix in the relative velocity direction wherein the interpolated second range/relative velocity matrix has a frequency spacing corresponding to the frequency spacing of the first range/relative velocity matrix in the relative velocity direction;detect objects in the second range/relative velocity matrix to produce a second detection vector;unfold the second detection vector; anddetermine a true velocity of the detected objects based upon the unfolded first and second detection vectors.