Software defined automotive radar
A radar system has different modes of operation. In a method for operating the radar system, at least one of one or more transmitters are configured to transmit modulated continuous-wave radio signals, while at least one of one or more receivers are configured to receive radio signals. The received radio signals include the transmitted radio signals transmitted by the one or more transmitters and reflected from objects in the environment. The method further includes selectively modifying an operational parameter of at least one of the transmitters or at least one of the receivers. The selected operational parameter is modified to meet changing operational requirements of the radar sensing system.
1. A method for operating a radar sensing system, the method comprising:
configuring at least one of a plurality of transmitters to transmit modulated continuous-wave radio signals;
configuring at least one of a plurality of receivers to receive radio signals, wherein the received radio signals include the transmitted radio signals transmitted by the plurality of transmitters and reflected from objects in the environment; and
selectively modifying one or more operational parameters of at least one of the transmitters and at least one of the receivers, wherein the selected operational parameter is modified to meet changing operational requirements of the radar sensing system, wherein modifying operational parameters comprises modifying how the at least one transmitter processes radio signals for transmission and how the at least one receiver processes received radio signals, and wherein the modified operational parameters of the at least one transmitter are not dependent upon the modified operational parameters of the at least one receiver.
2. The method of claim 1 , wherein the changing operational requirements are defined at least in part by changing environmental and situational conditions.
3. The method of claim 1 further comprising converting the received radio signals into digital signals, and storing the digital signals in a memory, wherein the digital signals stored in the memory are digitally processed, and wherein for at least a portion of the time the digital signals are stored in the memory, digital processing is suspended.
4. The method of claim 1 further comprising digitally processing, with a digital front end, the received radio signals, wherein the digital processing is adapted to changes in an operational area, changing range, velocity, and/or angular resolution objectives, and changing types of radio interference.
5. The method of claim 1 further comprising shifting a carrier frequency of the transmitter and monitoring a magnitude of a received self-interfering radio signal for the purpose of minimizing the latter, wherein a frequency versus reflectivity is determined and used to define the frequency shift, and wherein the frequency shift mitigates self-interference caused by the received self-interfering radio signal.
6. The method of claim 1 further comprising compensating for shifting gain and phase inaccuracies in I/Q channel signal processing by adjusting input data fed to an I/Q correction module to correct an I/Q mismatch caused by the gain/phase inaccuracies, and wherein the I/Q phase mismatch is corrected utilizing correlation values, input from an analog processing system of the receiver, and adjusted correlator output values.
7. The method of claim 1 further comprising selectively coupling ones of a plurality of antennas to each respective receiver of the plurality of receivers, and wherein a quantity of receivers is different from a quantity of antennas.
8. The method of claim 7 further comprising dynamically selecting a quantity of virtual receivers to isolate an interfering radio signal into an angle.
9. The method of claim 7 further comprising dynamically selecting a quantity of virtual receivers for a desired angular resolution as defined by current operational conditions and current antenna configurations.
10. The method of claim 7 further comprising selecting one of a plurality of antenna configurations, as defined by a desired antenna pattern for the current operational conditions.
11. The method of claim 1 , wherein the modulated continuous-wave radio signals are defined by selected ones of a plurality of codes, wherein the method further comprises using code values of the plurality of codes, in combination with a bank of digital finite impulse response (FIR) filters, generating complementary signals of any self-interference noise, wherein the code values used are selected as defined by the selected ones of the plurality of codes used to modulate the transmitted radio signal; and subtracting the complementary signals at one or more points in the receiver prior to the interference saturating the receiver.
12. The method of claim 11 , wherein the code values used in the generation of complementary signals are defined by advanced temporal knowledge of the selected ones of the plurality of codes used to modulate the transmitted radio signal.
13. The method of claim 11 , wherein the modulation is phase modulation, as defined by the plurality of codes.
14. A method for operating a radar sensing system, the method comprising:
configuring a transmitter to transmit modulated continuous-wave radio signals;
configuring a receiver to receive radio signals, wherein the received radio signals include the transmitted radio signals transmitted by the transmitter and reflected from objects in the environment; and
selectively modifying one or more operational parameters of the transmitter and the receiver, wherein the selected operational parameter is modified to meet changing operational requirements of the radar sensing system, wherein modifying operational parameters comprises modifying how the transmitter processes radio signals for transmission and how the receiver processes received radio signals, and wherein the modified operational parameters of the transmitter are not dependent upon the modified operational parameters of the receiver.
15. The method of claim 14 , wherein the changing operational requirements are defined at least in part by changing environmental and situational conditions.
16. The method of claim 14 further comprising converting the received radio signals into digital signals, and storing the digital signals in a memory, wherein the digital signals stored in the memory are digitally processed, and wherein for at least a portion of the time the digital signals are stored in the memory, digital processing is suspended.
17. The method of claim 14 further comprising digitally processing, with a digital front end, the received radio signals, wherein the digital processing is adapted to the changing operational area, changing range, velocity, and/or angular resolution objectives, and changing types of radio interference.
18. The method of claim 14 further comprising shifting a carrier frequency of the transmitter and monitoring a magnitude of a received self-interfering radio signal for the purpose of minimizing the latter, wherein a frequency versus reflectivity is determined and used to define the frequency shift, and wherein the frequency shift mitigates self-interference caused by the received self-interfering radio signal.
19. The method of claim 14 further comprising compensating for an I/Q phase mismatch, wherein compensating for an I/Q phase mismatch comprises configuring an I/Q correction module to correct the I/Q mismatch, and wherein the I/Q phase mismatch is corrected utilizing correlation values, input from an analog processing system of the receiver, and correlator output values.