Abstract:
The present invention relates to a femtosecond laser based distance measurement device. More specifically, the present invention relates to a distance measurement device which uses a femtosecond laser based phase-locked composite wave interferometer to maintain constant phases between composite waves and enable distance measurement by measuring repetition rate of femtosecond laser in order to achieve high resolving power equal to or less than 1 μm and remove nonlinear error due to phase. According to the present invention, no limitation exists in a distance to be measured, high resolving power equal to or less than 1 μm is realized by a locked phase, and periodic nonlinear error is not caused.
Abstract:
The present invention relates to an off-axis infrared optical system with a concept of an asymmetric field of view. The area of the surface of the area, which is a monitoring criterion on the entire image screen, is vertically positioned below the center of an image to cause a monitoring image screen (20) of a ski area, whereby the attention is focused to occupy a relatively wide area, thus improving the monitoring effects. The position of the surface of the sea in regards to an object to be monitored is made by adjusting an incidence angle of infrared rays received to an object lens (7). By including an object lens adjuster (10) with an installation angle (x) coupled to the object lens (7), a vertical field of view above the surface of the sea can be made wide while making a vertical field of view below the surface of the sea of little interest narrow with respect to the incidence angle of the infrared rays. More specifically, a reference surface of the sea can be moved to a desired position with a field of view of the off-axis infrared optical system, thereby efficiently adjusting the field of view of a region of interest, reducing a load on the optical design, and improving performance.
Abstract:
A frequency hop timing acquisition system is provided to enable a frequency hop timing adjustment unit to apply a frequency hop timing adjustment signal to a frequency reverse hopper according to a determination result of a determination unit, thereby improving the accuracy of sync acquisition even in environment in which there is a jamming signal. An envelop curve detecting unit(30) analyzes each fixed frequency signal filtered according to a predetermined course and extracts a frequency hop signal according to the predetermined course on the basis of the analysis result. A normalizing unit(100) normalizes the frequency hop signal outputted according to the predetermined course. A K-hop adding unit(40) accumulates the output signal of the normalizing unit during K-hop and outputs the accumulated signal.
Abstract:
본 발명은 네트워크 진입 및 이탈이 매우 빈번하게 발생되는 네트워크 운용 환경에서 네트워크 운용 절차를 축소하여 보다 간편하게 네트워크를 관리하는 방법에 대한 것이다. 항공기는 매우 빠르게 기동을 하기 때문에 네트워크 진입 및 이탈이 매우 빈번하게 발생될 수 있는데, 그 때마다 운용정보 설정, 가입, 탈퇴를 반복하게 되면 네트워크 관리가 매우 번거롭고 복잡해지는 문제가 발생한다. 상기와 같은 문제를 해결하기 위하여 본 발명은 네트워크 진입 및 이탈이 매우 빈번하게 발생되는 네트워크 운용 환경에 적합한 네트워크 관리방법를 제안한 것이다. 본 발명의 방법을 적용할 경우, 네트워크 관리 절차가 간단해 지는 효과가 있다. 본 발명에서는 중심국과 가입단말 간 네트워크 탈퇴 절차가 없다. 또한 네트워크 영역 진입 시에는 중심국이 주기적으로 전송하는 네트워크 구성정보에 따라 가입단말이 선별적으로 네트워크 가입을 수행하기 때문에 가입단말의 네트워크 관리 부담이 크게 경감된다.