METHOD AND APPARATUS FOR RADAR WAVEFORMS USING ORTHOGONAL SEQUENCE SETS

1 . A method for suppressing interference in a radar system, comprising:

assigning a first orthogonal sequence to the radar system;

transmitting a phase-coded waveform based on the first orthogonal sequence;

receiving an echo from transmission of the phase-coded waveform;

identifying correlation peaks in the echo; and

determining a Doppler estimate of delay between the correlation peaks.

2 . The method as in claim 1 , further comprising determining a source of the echo.

3 . The method as in claim 1 , further comprising modulating information onto the phase-coded waveform.

4 . The method as in claim 1 , wherein the first orthogonal sequence is a set of concatenated orthogonal sequences.

5 . The method as in claim 1 , wherein the radar system is part of a vehicle system.

6 . The method as in claim 1 , wherein the orthogonal sequence is based on a cellular system and cellular sequences.

7 . The method as in claim 6 , wherein the orthogonal sequence is a Zadoff-Chu sequence.

8 . The method as in claim 1 , wherein the orthogonal sequence is designed to suppress bandlimited interference.

9 . The method as in claim 8 , wherein the radar system is part of a vehicle system and further comprises detecting an echo of the vehicle.

10 . The method as in claim 1 further comprising distinguishing echoes within a range ambiguity distance.

11 . A radar system, comprising:

means for assigning a first orthogonal sequence to the radar system;

means for transmitting a phase-coded waveform based on the first orthogonal sequence;

means for receiving an echo from transmission of the phase-coded waveform;

means for identifying correlation peaks in the echo; and

means for determining a Doppler estimate of delay between the correlation peaks.

12 . The radar system as in claim 11 , wherein the means for transmitting is a waveform transmission module adapted to generate a waveform configured as a radar signals.

13 . The radar system as in claim 12 , wherein means for receiving an echo is a receiver module adapted to receive signals, including radar echoes, interferences, and ghost echoes and wherein the receiver module is adapted to distinguish between radar echoes, interferences and ghost echoes.

14 . The radar system as in claim 11 , wherein the first orthogonal sequence is a complex mathematical sequence providing a signal of constant amplitude and wherein received signals at the means for receiving are uncorrelated with each other.

15 . The radar system as in claim 11 , wherein the first orthogonal sequence is cyclically shifted version of an original code.

16 . The radar system as in claim 11 , wherein the first orthogonal sequence suppresses interference.

17 . The radar system as in claim 11 , wherein the employing pseudo-random number (PRN) codes to provide ranging capability by estimating the correlating the echo with a local sequence comprising peaks.

18 . A vehicular radar system, comprising:

a processor adapted to select a Zadoff-Chu sequence;

a transmitter module for generating a concatenated waveforms including the transmitter identification information and vehicle identification information, wherein each portion of the waveform includes a spectrum spreading symbol;

a receiver module to receive radar signals and adapted to correlate a received signal with an original signal and to identify correlation peaks; and

integration means for vehicle-to-everything (V2X) infrastructure.

19 . The vehicular radar as in claim 18 contained within a terrestrial vehicle.

20 . The vehicular radar as in claim 18 contained within an aerial vehicle.