A buoy-type high-frequency ground wave radar system. A buoy platform is used as an offshore carrier of a ground wave radar. A sky wave emission subsystem is disposed on a shore base and emits a high-frequency electromagnet wave. After the high-frequency electromagnet wave is refracted by the ionosphere and is reflected by the sea surface, a sky wave signal is formed. An attitude measurement subsystem measures and acquires attitude data of the buoy platform in real time. A ground wave radar subsystem receives a ground wave signal by using the ground wave radar, and processes the signal to form a ground wave doppler spectrum. Simultaneously, the sky wave signal is received, ionosphere disturbance compensation is performed on the sky wave signal in a frequency domain and then the sky wave signal is processed to form a sky wave doppler spectrum. The ground wave radar subsystem reconstructs an actual geographic coordinate system according to the attitude data measured by the attitude measurement subsystem and then the ground wave or the sky wave doppler spectrum is used to inverse wind wave current data in the reconstructed actual geographic coordinate system. The sky wave emission subsystem and the ground wave radar subsystem carry out time synchronization by means of a GPS synchronization networking. The system can detect a sea region of any distance and is suitable for high sea detection.

Systems and methods for detecting and locating power loads within a spherical waveguide bounded by the Earth's surface are disclosed. One or more eigenmodes of the Earth-ionosphere waveguide may be computed based on a mathematical model incorporating electrical properties of the terrestrial surface and plasma physics of the ionospheric layer. A phased array of wave guide couplers, each including an array of electrically-connected waveguide-coupling elements, may be configured at different geographic locations for coupling to the one or more eigenmodes and generating standing waves in the Earth-ionosphere waveguide. Power loads may be detected by way of power reflections, and by adjusting relative phases and/or amplitudes of the waveguide couplers, as well as frequencies, power nodes and nulls of the standing waves may be steered with respect to specified locations. Using reflections and steering, locations of power loads may be triangulated.

A search area width setting unit for setting a search area width having a frequency corresponding to a signal component of an object by using detection information of the object is included, and a signal component selecting unit determines a search area having the search area width set by the search area width setting unit and selects a signal component a frequency of which is included in the search area from each of a signal received by a signal receiving unit and signals received by object detection devices. As a result, an increase in the false detection probability of the object can be suppressed even in a case where the reception signals have low signal power-to-noise power ratios.

Disclosed are various embodiments for exciting a guided surface waveguide probe to create a plurality of resultant fields that are substantially mode-matched to a Zenneck surface wave mode of a surface of a lossy conducting medium.

The present provides a radar apparatus and an antenna apparatus for the radar apparatus. Two transmission antennas disposed on both sides of the transmission antenna set may be arranged apart from each other by a predetermined vertical distance in a first direction perpendicular to the ground, and the four receiving antennas may be disposed apart from each other by a predetermined horizontal distance, so that the vertical information and the horizontal information of the object can be easily obtained in the long range detection mode and the short range detection mode.

The present invention relates to a surveillance equipment mounting unit that enables easy attachment and detachment of various surveillance equipment to/from a top end of a pillar installed on a vehicle and includes: a plate on which a bottom surface of the surveillance equipment is seated; and a reverse rotation prevention part coupled to connect a lower portion of the plate and the top end of the pillar to each other and allowing the plate to be rotated in only one direction. According to the present invention, the following advantages are provided: equipment mounted on a vehicle, such as a thermal observation device, radar, etc., can be easily coupled to the mounting unit regardless of type; a rotation angle can be controlled; a reverse rotation can be prevented; and mounting performance can be significantly improved by allowing release through releasing a reverse rotation prevention function.

To provide an improved radar apparatus capable of expanding the aperture length per antenna element and the aperture length of the virtual reception array antenna. One of a transmission array antenna and a reception array antenna includes a first antenna element group having m-pieces of antenna elements arranged at a first interval D.sub.t along a first axis direction (m is an integer of 1 or larger), and the other one of the transmission array antenna and the reception array antenna includes a second antenna element group having (n+1)-pieces of antenna elements arranged at a second interval D.sub.r(n) along the first axis direction (n is an integer of 1 or larger).

Disclosed is an exemplary guided surface waveguide probe. In one embodiment, the guided surface waveguide probe comprises a charge terminal elevated to a height above the lossy conducting medium; a support structure that supports the charge terminal; an internal coil that is supported within the support structure and is coupled to an excitation source; a conductive tube having a first end conductively coupled to the at least one section of internal coil, wherein a second end of the conductive tube extends vertically towards and is electrically coupled to the charge terminal; at least one sensor electrically coupled to the charge terminal or the internal coil, wherein the at least one sensor measures an operational parameter of the guided surface waveguide probe; and a non-conductive channel connected to the at least one sensor by which data associated with the operational parameter is communicated.

A method of operating a vertical incidence sounder. The sounder transmits a random modulated sounder signal, and receives a return signal, comprising a directwave component and a reflected component. A first cross-ambiguity process between the transmitted signal and the return signal is used to time and frequency align the return signal with the transmitted signal. The direct wave signal is removed, thereby producing a processed return signal. A second cross-ambiguity process between the transmitted signal and the processed return signal is performed to determine a time offset, which is used to estimate an ionospheric height.

The present invention relates to a surveillance equipment mounting device for a vehicle, the device including: a pillar vertically provided on a floor of a vehicle; and a support member horizontally provided on a top end of the pillar and having a substantially shape, wherein the support member is configured such that a first side section is shorter than a second side section with respect to the top end of the pillar, the first side section has an end provided with a first mounting part on which the equipment is mounted, and the second side section has an end provided with a second mounting part, the first mounting part being provided at a position lower than the second mounting part.