Velocity measurement signal transmission method and receiving method
A velocity measurement signal transmission and receiving method for an intelligent driving system includes generating a plurality of chirp signals for measuring moving velocities of one or more moving targets ( 301 ); and transmitting the plurality of chirp signals in a time-division multiplexing (TDM) repetition cycle by using M antennas ( 302 ), where the TDM repetition cycle includes one single-antenna transmit mode sub-cycle and L consecutive multi-antenna transmit mode sub-cycles.
1. A velocity measurement signal transmission method, comprising:
generating a plurality of chirp signals; and
transmitting the plurality of chirp signals in a time-division multiplexing (TDM) repetition cycle using M antennas,
wherein the TDM repetition cycle comprises a single-antenna transmit mode sub-cycle and L consecutive multi-antenna transmit mode sub-cycles,
wherein the single-antenna transmit mode sub-cycle comprises N frequency sweep cycles,
wherein transmitting the chirp signals further comprises transmitting N chirp signals of the chirp signals in the N frequency sweep cycles by one of the M antennas or simultaneously transmitting the N chirp signals by at least two of the M antennas,
wherein there is a delay between at least two of the M antennas,
wherein each multi-antenna transmit mode sub-cycle of the L consecutive multi-antenna transmit mode sub-cycles comprises M frequency sweep cycles,
wherein M chirp signals of the chirp signals in the M frequency sweep cycles are respectively transmitted in order by the M antennas,
wherein M and N are positive integers greater than 1, and
wherein L is a positive integer.
2. The velocity measurement signal transmission method of claim 1 , wherein a ratio of N to L is greater than a first threshold.
3. The velocity measurement signal transmission method of claim 1 , wherein values of L, M, and N cause a ratio of a quantity of 0 values to a quantity of non-0 values in a weight function w to not exceed a second threshold, wherein the weight function w=c⊗c − , wherein c is a vector that comprises N+L×M elements, wherein c − represents vector inversion of c, wherein ⊗ represents a linear convolution operation of the vector, wherein the N+L×M elements correspond to transmit antennas in the M antennas of N+L×M chirp signals in one TDM repetition cycle starting from the single-antenna transmit mode sub-cycle or the L consecutive multi-antenna transmit mode sub-cycles, wherein an element corresponding to a first transmit antenna of the M transmit antennas in the single-antenna transmit mode sub-cycle is 1, and wherein elements corresponding to the other M−1 antennas other than the first transmit antenna are zero values.
4. The velocity measurement signal transmission method of claim 2 , wherein values of the L, the M, and the N cause a ratio of a quantity of zero values to a quantity of non-0 values in a weight function w does to not exceed a second threshold, wherein the weight function w=c⊗c − , wherein c is a vector that comprises N+L×M elements, wherein c − represents vector inversion of c, wherein ⊗ represents a linear convolution operation of the vector, wherein the N+L×M elements correspond to transmit antennas in the M antennas of N+L×M chirp signals in one TDM repetition cycle starting from the single-antenna transmit mode sub-cycle or the L consecutive multi-antenna transmit mode sub-cycles, wherein an element corresponding to a first transmit antenna of the M transmit antennas in the single-antenna transmit mode sub-cycle is 1, and wherein elements corresponding to the other M−1 antennas other than the first transmit antenna are 0 values.
5. The velocity measurement signal transmission method of claim 1 , wherein a time interval between the single-antenna transmit mode sub-cycle and the multi-antenna transmit mode sub-cycle is zero; or is an integer multiple of the M frequency sweep cycles or the N frequency sweep cycles.
6. The velocity measurement signal transmission method of claim 2 , wherein a time interval between the single-antenna transmit mode sub-cycle and the each multi-antenna transmit mode sub-cycle is zero; or is an integer multiple of the M frequency sweep cycles or the N frequency sweep cycles.
7. The velocity measurement signal transmission method of claim 3 , wherein a time interval between the single-antenna transmit mode sub-cycle and the each multi-antenna transmit mode sub-cycle is zero, or is an integer multiple of the M frequency sweep cycles or the N frequency sweep cycles.
8. The velocity measurement signal transmission method of claim 1 , wherein a first transmit antenna in the single-antenna transmit mode sub-cycle transmits the (K+1) th chirp signal in the multi-antenna transmit mode sub-cycle, wherein K is an integer greater than or equal to 0, and wherein a relationship among M, N, and K satisfies one of the following:
if K= 0, N≥M− 1;
if 0< K≤M,N≥M ; or
if K>M,N≥K+ 1.
9. A signal transmission apparatus, comprising:
a memory configured to store instructions; and
a processor coupled to the memory and configured to execute the instructions to cause the signal transmission apparatus to:
generate a plurality of chirp signals; and
transmit the plurality of chirp signals in a time division multiplexing (TDM) repetition cycle using M antennas,
wherein the TDM repetition cycle comprises a single-antenna transmit mode sub-cycle and L consecutive multi-antenna transmit mode sub-cycles,
wherein the single-antenna transmit mode sub-cycle comprises N frequency sweep cycles,
wherein the signal transmission apparatus is configured to transmit N chirp signals of the chirp signals in the N frequency sweep cycles by one of the M antennas or simultaneously transmit the N chirp signals by at least two of the M antennas,
wherein there is a delay between the at least two antennas,
wherein each multi-antenna transmit mode sub-cycle of the L consecutive multi-antenna transmit mode sub-cycles comprises M frequency sweep cycles,
wherein M chirp signals of the chirp signals in the M frequency sweep cycles are respectively transmitted in order by the M antennas, and
wherein M and N are positive integers greater than 1, and L is a positive integer.
10. The signal transmission apparatus of claim 9 , wherein a ratio of N to L is greater than a first threshold.
11. The signal transmission apparatus of claim 9 , wherein values of L, M, and N cause a ratio of a quantity of 0 values to a quantity of non-0 values in a weight function w to not exceed a second threshold, wherein the weight function w=c⊗c − , wherein c is a vector that comprises N+L×M elements, wherein c − represents vector inversion of c, wherein ⊗ represents a linear convolution operation of the vector, wherein the N+L×M elements correspond to transmit antennas in the M antennas of N+L×M chirp signals in one TDM repetition cycle starting from the single-antenna transmit mode sub-cycle or the L consecutive multi-antenna transmit mode sub-cycles, wherein an element corresponding to a first transmit antenna of the M transmit antennas in the single-antenna transmit mode sub-cycle is 1, and wherein elements corresponding to the other M−1 antennas other than the first transmit antenna are 0 values.
12. The signal transmission apparatus of claim 10 , wherein values of the L, the M, and the N cause a ratio of a quantity of 0 values to a quantity of non-0 values in a weight function w to not exceed a second threshold, wherein the weight function w=c⊗c − , wherein c is a vector that comprises N+L×M elements, wherein c − represents vector inversion of c, wherein ⊗ represents a linear convolution operation of the vector, wherein the N+L×M elements correspond to transmit antennas in the M antennas of N+L×M chirp signals in one TDM repetition cycle starting from the single-antenna transmit mode sub-cycle or the L consecutive multi-antenna transmit mode sub-cycles, wherein an element corresponding to a first transmit antenna of the M transmit antennas in the single-antenna transmit mode sub-cycle is 1, and wherein elements corresponding to the other M−1 antennas other than the first transmit antenna are 0 values.
13. The signal transmission apparatus of claim 9 , wherein a time interval between the single-antenna transmit mode sub-cycle and the multi-antenna transmit mode sub-cycle is zero, or is an integer multiple of the M frequency sweep cycles or the N frequency sweep cycles.
14. The signal transmission apparatus of claim 10 , wherein a time interval between the single-antenna transmit mode sub-cycle and the each multi-antenna transmit mode sub-cycle is zero; or is an integer multiple of the M frequency sweep cycles or the frequency sweep cycles.
15. The signal transmission apparatus of claim 11 , wherein a time interval between the single-antenna transmit mode sub-cycle and the each multi-antenna transmit mode sub-cycle is zero, or is an integer multiple of the M frequency sweep cycles or the N frequency sweep cycles.
16. The signal transmission apparatus of claim 9 , wherein a first transmit antenna in the single-antenna transmit mode sub-cycle transmits the (K+1) th chirp signal in the multi-antenna transmit mode sub-cycle, wherein K is an integer greater than or equal to 0, and a relationship among M, N, and K satisfies one of the following:
if K= 0, N≥M− 1;
if 0< K≤M,N≥M ; or
if K>M,N≥K+ 1.