초록 ▼

In accordance with the principles of the invention, a surveillance radar is provided with a rotating, frequency squinting, end-fed slotted array antenna, which is caused to transmit a plurality of different carrier frequency pulses for successively illuminating specific antenna beam positions during

In accordance with the principles of the invention, a surveillance radar is provided with a rotating, frequency squinting, end-fed slotted array antenna, which is caused to transmit a plurality of different carrier frequency pulses for successively illuminating specific antenna beam positions during rotation of the antenna. Upon reception of each radar signal return, a signal processor responsive to the frequency of each transmitted pulse and the mechanical pointing angle of the antenna at the time of transmission of each pulse, will determine the frequency dependent squint angle for the transmitted pulse and combine that angle with the instantaneous mechanical pointing angle of the antenna at the time of the pulse transmission, to determine the actual beam pointing angle for each pulse at the time of its transmission. A video signal processor groups together the pulse signal returns from physically adjacent ones of the actual beam pointing angles for common processing, i.e, integration, for improving the target detection performance of the radar system.

대표청구항 ▼

A surveillance radar for propagating electromagnetic pulse energy along a propagation path sweeping in range and azimuth across a region in space including a surveillance area, and processing return energy therefrom, comprising: transmitting means for generating a sequence of at least two pulses of

A surveillance radar for propagating electromagnetic pulse energy along a propagation path sweeping in range and azimuth across a region in space including a surveillance area, and processing return energy therefrom, comprising: transmitting means for generating a sequence of at least two pulses of carrier signals, the frequency of the carrier signal of each of said pulses in said sequence being controllable so as to be of a different frequency; a rotating, frequency squinting, slotted array antenna, responsive to said pulses of carrier signals for transmitting said pulses of carrier signals so as to successively illuminate specific antenna beam positions with electromagnetic energy pulses during rotation of the antenna, and receiving return signals in response to energy reflected from said beam positions by each of said successively transmitted pulses of carrier signals; receive means for receiving each of said return signals and developing video signals representative thereof; processing means for processing each of said video signals, said processing means being responsive to the frequency (FR) of each transmitted pulse of carrier signals for determining a frequency dependent squint angle for the transmitted pulse of carrier signals and the mechanical pointing angle (Mech. AZ) of the antenna at the time of transmission of each pulse of carrier signals, for determining the actual beam pointing angle (True AZ) for each of the successively received video signals, and then integrating groups of said video signals together which have physically adjacent actual beam pointing angles; and display means for displaying said video signals so as to enable a user to detect targets in said surveillance area.