Coherent and incoherent mixed target doa estimation method based on coprime mimo array
A mixed target and array technology, applied in the field of signal processing, can solve the problems of inability to realize DOA estimation and false targets of DOA estimation results, and achieve the effect of improving flexibility and meeting the needs of DOA estimation
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Embodiment 1
[0036] see figure 1 , a coherent and non-coherent mixed target DOA estimation method based on a coprime MIMO array, including the following steps:
[0037] (1) Select an area, arrange N transmitting array elements and 2M-1 receiving array elements according to the coprime layout, so as to form a coprime MIMO array, where Mt ={Mnd; n=0,1,…,N-1}, the position of 2M-1 receiving antennas is P r ={Nmd; m=1,2,...,2M-1}, d is the basic distance of half wavelength;
[0038] (2) N transmitting array elements sequentially transmit electromagnetic wave signals with frequency c / 2d for target detection. If the target is detected, it will return after scattering, and the returned echo signal is received by 2M-1 receiving array elements at the same time, and ( 2M-1)×N echo signals of the transceiver channels, each echo signal of each channel is sampled K times to generate K snapshot data;
[0039] (3) Add the positions of the N transmitting array elements to the positions of 2M-1 receiving...
Embodiment 2
[0056] see Figure 2-Figure 4 ; This embodiment adopts MATLAB simulation software to carry out simulation, sets the measured coherent and non-coherent hybrid target in the far field, uses the coprime MIMO array of M=3 and N=4, sets the number of snapshots to be 2000, and the signal-to-noise ratio is 10dB, the basic interval d of half wavelength is 1.
[0057] (1) Arrange N=4 transmitting array elements and 2M-1=5 receiving array elements according to the coprime layout to form a coprime MIMO array, and the position of the 4 transmitting array elements is P t ={0,3,6,9}, the positions of the 5 receiving antennas are P r ={4,8,12,16,20}, such as figure 2 shown.
[0058] (2) Four transmitting array elements sequentially transmit electromagnetic wave signals with a frequency of c / 2d=150MHz, and the echo signals after reaching the target are received by five receiving array elements at the same time, thus obtaining echo signals of 5×4 transceiver channels , the echo signal of ...
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