Exact(5)
Range alignment is to compensate the range shifts of profiles.
A non-linear correction method is applied to compensate the range backscatter signal.
From the above formula derivation, we know that this method can perfectly compensate the range spectrum of the target which is located in the same distance with the reference target.
Whether the higher call intensities in Rh females play a role for communication or serve to (over) compensate the range loss resulting from the higher female call frequency (compare [70]) clearly deserves further study.
Step 3 Compensate the range migration term ϕ rcm(f η ), range modulation term ϕ rg(f η ), residue phase term ϕ res(f η, f τ ), and SRC term ϕ src(f η ), this can be implemented by multiplying them with their conjugate phase,, H 1 f τ, f η, R 0 = exp jϕ f τ, f η (23).
Similar(55)
Applying inversed discrete Fourier transform (IDFT) to s(m, n) and taking the magnitude, the expression of range profile after compensating the range shift by t e is given by p k, n ; t e = a b s 1 M ∑ m = 0 M − 1 exp j 2 π km M ⋅ s m, n ⋅ exp − j 2 π ⋅ t e n ⋅ m ⋅ Δ f r k = 0, 1, …, M − 1 = a b s 1 M ∑ m = 0 M − 1 exp j 2 π km M ⋅ s ˜ m, n ⋅ exp j 2 π ⋅ Δ t e n − t e n ⋅ m ⋅ Δ f r + ε k, n (12).
One-step MOCO-based SAR imaging algorithm is investigated by compensating the range-dependent motion error before RCMC, so the presence of range cell migration error would be significantly suppressed.
At last, we compensate the whole range cells with the estimated phase error.
Also, the computer vision technique can be applied to compensate the corrupted ranging information.
On the other hand, since motion parameters of the receiver platform are precisely known, we can compensate for the range migration due to its movement [15] about a ground reference position in close vicinity of the actual position of targets, referred to as scene origins.
After that, bulk range cell migration correction (RCMC) and second range compression (SRC) are carried out to compensate the high-order RCM and range compression terms.
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