  A new parameter estimation algorithm, known as Sub-band Dual Frequency
Conjugate LVT (SDFC-LVT), is proposed for the ground moving targets. This
algorithm first constructs two sub-band signals with different central
frequencies. After that, the two signals are shifted by different values in
frequency domain and a new signal is constructed by multiplying one with the
conjugate of the other. Finally, Keystone transform and LVT operation are
performed on the constructed signal to attain the estimates. The cross-term and
the performance of the proposed method are analyzed in detail. Since the
equivalent carrier frequency is reduced greatly, the proposed method is capable
of obtaining the accurate parameter estimates and resolving the problem of
ambiguity which invalidates Keystone transform. It is search-free and can
compensate the range walk of multiple targets simultaneously, thereby reducing
the computational burden. The effectiveness of the proposed method is
demonstrated by both simulated and real data.
