Abstract:

In response to the problem that while using the vertical transmission array directional design for shadow zone detection, the main lobe of the beam in traditional shading technique narrows with the increase of the array elements number and cannot cover the whole shadow zone, this paper proposes a signal transmission strategy of diversity shading. Under this strategy, the transmitted signal waveform is designed as multiple sub pulses of equal length, and different sub pulses are aligned at different angles through phase control to form a beam that illuminates the entire shadow zone. The article provides the parameter selection method for maximizing the transmission gain and proposes the use of multi template joint matching filtering to reasonably select replica signals to achieve the goal of superimposing the energy of each sub pulse and further obtaining gain. The simulation results show that compared to traditional shading method, the proposed emission strategy can simultaneously illuminate the entire shadow zone and achieve high transmission gain with significant advantages.

Key words: shadow zone target detection, vertical transmit array, transmission gain, subpulse, shading