Method and apparatus for radar waveforms using orthogonal sequence sets

1. A radar sensor, comprising:

a waveform generator of a waveform transmission module adapted to generate a phase-coded waveform based on a sequence set, which is formed from an orthogonal sequence concatenated multiple times with itself, wherein the orthogonal sequence is a Zadoff-Chu (ZC) sequence, the waveform generator further adapted to:

generate a plurality of orthogonal sequences of length L, wherein the orthogonal sequences are Zadoff-Chu (ZC) sequences;

assign a first orthogonal sequence to a radar sensor device; and

concatenate the first orthogonal sequence multiple times with itself to form a sequence set;

generate a phase-coded waveform from the sequence set; and

a receiver adapted to estimate a range and a Doppler from a periodic auto-correlation formed from a correlation of a received echo and the phase-coded waveform comprising cross-correlation values, wherein the phase-coded waveform comprises cross-correlation values that are used to suppress interference in the received echo, the receiver further adapted to:

correlate the echo with the phase-coded waveform to form a periodic auto-correlation comprising correlation peaks;

suppress interference in the echo using the cross-correlation values; and

determine a Doppler estimate from a delay between the correlation peaks of the periodic auto-correlation.

2. The radar sensor of claim 1 , wherein the phase-coded waveform comprises at least one of an increasing phase evolution or a decreasing phase evolution.

3. The radar sensor of claim 1 , wherein the phase-coded waveform comprises one of a triangle-type phase evolution or a saw-type phase evolution.

4. The radar sensor of claim 1 , wherein a transmit antenna of the waveform transmission module is adapted to transmit the phase-coded waveform.

5. The radar sensor of claim 1 , wherein the phase-coded waveform has a frequency within an autonomous vehicle range of frequencies.

6. The radar sensor of claim 1 , wherein the receiver is further adapted to estimate the Doppler from a delay between correlation peaks of the periodic auto-correlation.

7. A method for generating a radar signal, the method comprising:

generating a plurality of orthogonal sequences of length L, wherein the orthogonal sequences are Zadoff-Chu (ZC) sequences;

assigning a first orthogonal sequence to a radar sensor device;

concatenating the first orthogonal sequence multiple times with itself to form a sequence set;

generating a phase-coded waveform from the sequence set;

receiving an echo from the phase-coded waveform comprising cross-correlation values;

correlating the echo with the phase-coded waveform to form a periodic auto-correlation comprising correlation peaks;

suppressing interference in the echo using the cross-correlation values; and

determining a Doppler estimate from a delay between the correlation peaks of the periodic auto-correlation.

8. The method of claim 7 , further comprising determining a source of the echo.

9. The method of claim 8 , wherein the determining of the source of the echo comprises extracting identification information from an IPv6 address.

10. The method of claim 7 , wherein the phase-coded waveform comprises at least one of an increasing phase evolution or a decreasing phase evolution.

11. The method of claim 7 , wherein the phase-coded waveform comprises one of a triangle-type phase evolution or a saw-type phase evolution.

12. The method of claim 7 , further comprising transmitting the phase-coded waveform.

13. A vehicle for autonomous driving, the vehicle comprising:

a radar sensor comprising:

a waveform generator of a waveform transmission module adapted to generate a phase-coded waveform based on a sequence set, formed from an orthogonal sequence concatenated multiple times with itself, wherein the orthogonal sequence is a Zadoff-Chu (ZC) sequence, and wherein the phase-coded waveform comprises cross-correlation values, the waveform generator further adapted to:

assign a first orthogonal sequence to a radar sensor device; and

concatenate the first orthogonal sequence multiple times with itself to form a sequence set;

generate a phase-coded waveform from the sequence set; and

a receiver adapted to estimate a range and a Doppler from a periodic auto-correlation formed from a correlation of a received echo and the phase-coded waveform comprising cross-correlation values, wherein the receiver is further adapted to suppress interference in the received echo using the cross-correlation values, the receiver further adapted to:

correlate the echo with the phase-coded waveform to form a periodic auto-correlation comprising correlation peaks;

suppress interference in the echo using the cross-correlation values; and

determine a Doppler estimate from a delay between the correlation peaks of the periodic auto-correlation.

14. The vehicle of claim 13 , wherein the phase-coded waveform comprises at least one of an increasing phase evolution or a decreasing phase evolution.

15. The vehicle of claim 13 , wherein the phase-coded waveform comprises one of a triangle-type phase evolution or a saw-type phase evolution.

16. The vehicle of claim 13 , wherein a transmit antenna of the waveform transmission module is adapted to transmit the phase-coded waveform.

17. The vehicle of claim 13 , wherein the receiver is further adapted to receive the echo.

18. The vehicle of claim 13 , wherein the vehicle is one of a terrestrial vehicle, an airborne vehicle, or a marine vehicle.

19. The vehicle of claim 18 , wherein the phase-coded waveform has a frequency within an autonomous vehicle range of frequencies.