Abstract
Long time coherent integration technique is one of the most important methods to improve the radar detection ability of a weak maneuvering target. However, the integration performance may be greatly influenced by the range migration and Doppler migration effects caused by the complex motions of maneuvering targets when long time integration is applied. Besides, the frequency hopping characteristic of the transmitted signal will also result in Doppler migration which cannot be eliminated by the conventional coherent integration method. To deal with this problem, a novel coherent integration method based on phase compensation is proposed. By using the frequency hopping pattern, the Doppler migration is eliminated by adding an extra phase in the twiddle factor of Fourier Transform in this proposed method. Since the phase error is compensated, long time coherent integration can be achieved. The effectiveness of the proposed method is verified by the simulation results and the performance analysis.
Highlights
Radar system, whether active or passive, detects the reflection of an available radar source or non-radar source transmission signal off the interested target
PROBLEM FORMULATION Except transmission stations, a typical bistatic radar system usually consists of two sets of antenna: one is the reference antenna which is used to collect the direct signal transmitted from the transmitter as the reference signal; the other one is the surveillance antenna which is mainly used to collect the target echoes, but it is inevitably contaminated by the direct signal from the transmitter and the multipath reflected by the ground scatterers
It can be seen from the results that three targets still can be detected by the proposed coherent integration method. These results show that the proposed method can deal with the long time coherent integration problem for the frequency hopping pulse (FHP) signal
Summary
Whether active or passive, detects the reflection of an available radar source or non-radar source transmission signal off the interested target. To solve the detection problem of the weak target, long time integration technique has been proposed. Except the high maneuverability of the target, the frequency hopping characteristic of the transmitted signal will result in Doppler migration This kind of migration cannot be eliminated by the conventional time-frequency analysis method. To deal with the long time coherent integration problem for frequency hopping pulse (FHP) signal, incoherent integration processing is the common method. Long time coherent integration method for FHP signal is proposed in this paper. In this novel method, the Doppler frequency difference caused by the characteristic of FHP signal is compensated by adding an extra error phase to the twiddle factor of Fourier Transform.
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