In this section, we analyze the m-D effect in OFDM-LFM MIMO radar induced by rotation.
From (15) and (16), three conclusions about the m-D effect in MIMO radar system can be obtained:
1) The m-D effect induced by the rotation appears as a sinusoidal curve on both the range-slow-time plane and the joint time-frequency plane, and the period of the curve is equivalent to the rotation period, which is similar to that in the monostatic radar system.
2) The amplitudes of the m-D curves on both the range-slow-time plane and the joint time-frequency plane are determined by r, [[theta].sub.1], [[theta].sub.2] and [phi].
3) The initial phase [phi] of the m-D curves is determined by [[theta].sub.1], [[theta].sub.2] and [phi], which means that it is difficult to determine the instantaneous location of the rotating scatterer by extracting the initial phase feature of the m-D curve.
Figure 4 shows the comparison of the m-D curve obtained by a monostatic radar and a MIMO radar consisting of a pair of transmitter and a receiver.
In this section, the m-D model of the rotationally symmetric BT is derived.
It is evident from (12) and (13) that the m-D effect of the sliding-type scattering center B or C or D or E is not a form of sinusoidal modulation since that the second term changes along with time.
Since the micro-motion and structural information of the BT are contained by the curves on the m-D plane, the features can be extracted by detecting the parameters of these curves.
The m-D effects induced by the precession of the BT induce curves on the m-D plane.
The m-D effect of scattering centers A, B, C, D and E can be rewritten into a uniform form as