66 results about "Passive probing" patented technology

A method and apparatus for passive probing of forwarded TCP communication sessions between a client and a server. This includes receiving forwarded data packets corresponding to the TCP communication sessions; and ordering the received data packets and reconstructing session content for each TCP session. If at least one of the communication sessions is encrypted, then: identifying an encryption scheme and a session key using the reconstructed session content; decrypting the session content, the decryption based upon the identified encryption scheme and the identified session key; and forwarding the decrypted session content to an external entity; else forwarding the reconstructed session content of to an external entity.

A WLAN (108) includes a first access point (104) for providing wireless service within a first coverage area, a second access point (106) for providing wireless service within a second coverage area and programmed to transmit probe responses, and a wireless communications unit (102) located within the first coverage area and operating on the wireless service of the first access point (104). The communications unit (102) is programmed to monitor, or passively probe, for the probe responses, or is instructed by the first access point (104) on when to monitor for the probe responses, transmitted by the second access point (106). By executing such passive probing, the communications unit (102) may make handover decisions for switching between the wireless service of the first access point (104) to the wireless service of the second access point (106) based on access point data included in the probe responses.

A system and method for a request failover mechanism on a load balancing system. The method may include a load balancer selecting a node from among a plurality of nodes associated with the load balancer to handle a request. The load balancer may limit selection to those nodes not known by the load balancer to be inactive. The load balancer may then determine if the selected node is able to service the request. In response to determining the selected node is unable to handle the request, the load balancer may select another node from among the plurality of nodes not known by the load balancer to be inactive. In various embodiments, the load balancer may mark nodes which are unable to service requests as inactive. The load balancer may determine if nodes are able to service requests by various methods, including active probing, passive probing, and dummy probing.

The invention relates to a passive radar detection method by use of synergistic or asynergistic satellite signals to detect low altitude targets, belonging to the technical field of space technology, which comprises a satellite and a ground passive radar system; wherein, the system comprises a plurality of detection stations and a data processing station, and interactive communications are conducted between the detection stations and the data processing station by means of radio or optical fiber transmission method. The signals, expanded frequency measurement codes and the signals reflected on low altitude aircrafts by and of the satellite, especially high radiation power satellite, are received by the detection station receivers of the passive radar with high sensitivity. After correlation, the path difference between the direct radiation signals of the satellite and the signals from the same source reflected by the low altitude targets can be derived; then, a group of passive detection equations can be established; the solutions can be obtained simultaneously. And a three-dimensional position coordinate of the low or super low altitude targets can be thus acquired. The invention has the advantages of huge detection area, small blind area, the capability of detecting low or super low aircrafts like cruise missiles and super low altitude airplanes passively at long range, and extensive application value for military use.

The invention provides a method for using a shallow-sea low-frequency coherent vector sound field interference structure for detecting and identifying a target. The first step is that the Fourier transformation of the sound pressure and the vibration velocity signal is respectively carried out; the second step is that the Fourier transformation of the vector signal is conjugated; the third step is that the Fourier transformation of the sound pressure signal is multiplied by and the female court attendant of the Fourier transformation of the vector signal; the fourth step is that the real part or the imaginary part is obtained; the fifth step is that the judgment of the positive or negative sign is carried out; and the sixth step is that the depth classification of the target is given according to the judgment of the positive or the negative sign of the fifth step. The method develops the work against the passive detection of the remote target and the target depth judgment, in particular to the application purpose of the target depth judgment. The method has important application prospect in comprehensive marine monitoring, seashore early-warning system, small platform sonar, aviation acoustic buoy and other aspects.

A WLAN (108) includes a first access point (104) for providing wireless service within a first coverage area, a second access point (106) for providing wireless service within a second coverage area and programmed to transmit probe responses, and a wireless communications unit (102) located within the first coverage area and operating on the wireless service of the first access point (104). The communications unit (102) is programmed to monitor, or passively probe, for the probe responses, or is instructed by the first access point (104) on when to monitor for the probe responses, transmitted by the second access point (106). By executing such passive probing, the communications unit (102) may make handover decisions for switching between the wireless service of the first access point (104) to the wireless service of the second access point (106) based on access point data included in the probe responses.

The invention discloses a passive detection system for detecting a low-altitude target by using navigation radar signals and relates to the field of passive radars. The passive detection system comprises a non-cooperative navigation radar, a passive receiving system, a signal information processing module and a geographic information module used for displaying positioning results. The invention further discloses a method for passively positioning the low-altitude target by using the navigation radar. The method includes steps that: 1 the passive receiving system measures arrival angles of a direct arrival signal and a target echo; 2 direct arrival pulses are adopted to estimate the azimuth angle of a navigation radar emitting antenna scanning from a direct arrival path to a target reflection path; 3 the signal information processing module is adopted to obtain time delay of the target echo relative to the direct arrival signal; 4 measurement is obtained, a triangle formed by the navigation radar, the target and the passive receiving system is solved and three-dimensional coordinates of the target are obtained; and 5 the target position is given on an electronic map. The passive detection system and method have the capability of detecting the low-altitude target for maintaining electromagnetic silence and can achieve situation monitoring and early warning.

The invention discloses a measuring method of an airborne single-station passive positioning system on a measure target radiation wavelength. The measuring method comprises the following steps: making an airborne single-station passive probing platform do constant motion along a straight line; firstly, using the receiving front end to process received probing signals; then, sending the received probing signals into a digital signal processing unit; sending signal frequency values obtained through regular detection under the control of a synchronous clock into a memory; and calling the latest three frequency values from the memory by the data processing unit in a mode of automatic or manual commands under the triggering effect of the regular synchronous clock to measure the wavelength of the measured signals. The invention can accurately estimate and obtain the wavelength of the measure target radiation signals through the simple frequency measuring technology, and the measuring method can be applied to the execution of long distance positioning measuring tasks. However, an aerial measuring platform which has simple equipment and can not be supported by a ground measuring system can also be applicable to the monitoring management of aerial radio signals.

The invention relates to an active positioning method based on a reliable sound path and target multipath echo. For solving disadvantages of a passive detection method based on a reliable sound path, a single base active sonar is proposed to arrange under the critical depth, the reliable sound path is utilized to irradiate a target, the target multipath echo is further acquired, and the final target positioning result is acquired. The method is advantaged in that the basic principle and an enforcement scheme are verified through computer value simulation, as proved by the result, effective target positioning in the deep sea environment can be realized.

Systems and methods for screening, where a subject walks through or in front of a passive detector (or scanning unit) to be screened for possession of unauthorized electronics devices, provide for detecting and monitoring electronics systems not authorized to be used in secure areas. By focusing a very narrow beam width antenna array, individuals can be screened who may have concealed electronics devices that can pose danger to the surroundings. There is no need for removing clothing or accessories such as a jacket or backpack, for example. The detection system may include a frequency scanned passive receiver that captures a signal from a detected electronics device, measures its strength, and identifies the device or classifies it according to a pre-determined set of categories (e.g., cellular phone, camera, or global positioning system (GPS)).

In one embodiment, during network operation, it is dynamically determined whether to change from passive probing of communication path metrics to active probing of communication path metrics.

A method, apparatus, and system in an IP-based mobile communication network for actively probing a tunneled transmission path from a base station such as an eNB to a core network. A UE-emulator emulates a User Equipment (UE) and provides emulated NAS signaling to a Probe Connection Control (PCC) unit in the base station, which establishes the tunneled transmission path by forwarding the NAS signaling received from the emulator toward the core network. The PCC stores associated communication endpoints and UE-assigned IP addresses. A Probe Traffic Control (PTC) unit within the base station utilizes the stored endpoints and IP addresses to generate probe traffic through the tunneled transmission path toward a probe server or another base station configured as a probe reflector. The probe reflector collects and reports path properties such as packet loss, delay, jitter, and throughput.

The invention provides an inductive type human body approach warning controller. The inductive type human body approach warning controller is characterized by comprising a 12V direct current power source, a microwave induction and detection circuit, a monostability time-delay circuit, a direct current relay control and warning circuit and a status indication device. The model number adopted by a microwave induction controller IC1 in the microwave induction and detection circuit is TX982. The monostability time-delay circuit is composed of a time-base circuit IC2, a resistor R1 and an electrolytic capacitor C1, wherein the model number adopted by the time-base circuit IC2 is NE555. The status induction circuit is composed of a light-emitting diode (LED) and a resistor R2. All monitor devices can be divided into active detection and passive detection according to starting modes. The inductive type human body approach warning controller is a detection device using the active detection mode, is designed to overcome and compensate certain defects existing in certain monitoring devices, and solves the problem that selling price of all kinds of monitoring devices in market is high at the same time.

The invention relates to a dual-waveband active-polarization target identification system for observing a sea fog environment and belongs to the technical field of optical information processing. The system comprises a light source, a first light splitting system, an active polarization transmission system, a collimating and beam-expanding system, a second light splitting system, a dual-waveband polarization detection system, a joint-transform power spectrum generation system, a related peak generation system, a receiving system I, a receiving system II and a computer processing and controlling system. The detection principle of the traditional joint transform correlator is adopted, the advantages of polarization and infrared technologies in target detection are combined, and the existing passive detection mode is converted into an active polarization detection mode, so that the probability of target detection is increased. In the transmission system, a light splitting mode is adopted, and only one light source is adopted to complete active detection and target identification; in the receiving systems, a rotary control turntable is adopted, the system light path is simplified, the number of devices used by the systems is least on the premise of guaranteeing the quality of target identification, the operation is simple and convenient, and the implementation is easy.

The invention belongs to the acoustic vector sensor array signal processing field, and more specifically relates to an acoustic vector circular array source number detection method based on characteristic value multiple threshold correction which is applied to underwater target remote passive detection. The method comprises establishing an acoustic vector circular array signal receiving model, obtaining acoustic vector circular array receiving acoustic pressure data, radial vibration velocity data and tangential vibration velocity, constructing a covariance matrix of acoustic vector circular array acoustic pressure and vibration velocity combined treatment, and decomposing characteristic values; and performing multiple threshold division treatment on a characteristic value set obtained by decomposing the covariance matrix to obtain a signal and noise corresponding characteristic value set. The method dynamically integrates an information theory detection method based on characteristic value multiple thresholds and the sound anti-noise performance of an acoustic vector circular array, obviously reduces the signal to noise ratio threshold of a detection algorithm, and overcomes the disadvantages that traditional detection methods such as MDL, diagonal loading MDL, and GDE are more sensitive to noise characteristic value change.

The invention relates to a detection warning instrument. The detection warning instrument has the advantages that a multi-channel information processing system and an intelligent early warning system are arranged, multiple detection techniques, such as ultralow-frequency electromagnetic wave, ultrawide-frequency radar, sound wave / vibration, infrared rays and terahertz radar, are integrated, and a passive detection method and an active detection method are combined, so the detection warning function on life targets and non-life targets is realized; the false target excluding capability is improved, the accuracy and positioning speed of the detected target are improved, and the requirements of complicated environment conditions and task conditions are met.

The embodiment of the invention discloses a network range asset information collection method and device based on active and passive combination, and relates to the field of network security, and themethod comprises the steps: analyzing and recording fingerprint features, and constructing an operating system fingerprint comparison sample library and a service application or component fingerprintcomparison sample library; configuring a networking host in a detection network target range environment; collecting operating system information and service application or component information of the networked host in an active detection mode to form asset information data; collecting operating system information and service application or component information of the networked host in a passivedetection mode to form asset information data; and integrating asset information data acquired by active detection and passive detection to form a complete network range asset information list.

The invention discloses an industrial control network topological graph generation method based on active and passive detection, and the method comprises the steps: S1, capturing network flow data in a passive detection mode, carrying out analysis and formatting of traffic data, and storing traffic data in a database; S2, providing an IP in the traffic data for active detection; S3, performing active detection, firstly performing survival scanning, and recording a current survival IP and port; S4, scanning the currently survived IP and port through an industrial control protocol script, performing route tracking, analyzing and formatting a scanning result and route information, and storing the scanning result and the route information in a database; S5, extracting data from the database according to the filtering condition of the user to draw a topological graph and the like; The network topological graph of the detailed route can be generated for the network environment, the fault node can be found through the topological graph, the network problem can be rapidly and accurately solved, and a path can be provided for better managing and optimizing the network.

The invention belongs to the field of underwater acoustic detection, and particularly discloses a method for using underwater acoustic channel statistics invariant features to achieve passive ranging. The method for using the underwater acoustic channel statistics invariant features to achieve passive ranging comprises the steps that passive detection is carried out on a target on the basis of double array elements, each array element carries out LOFAR analysis on a received target broadband noise signal, stripes of an LOFAR graph of the received target broadband noise signal are extracted through the edge extraction technologies such as HOUGH transformation to obtain a waveguide invariant and an estimated value of a parabola parameter, and distance information and target speed information of a CPA point of the target can be obtained. According to the method for using the underwater acoustic channel statistics invariant features to achieve passive ranging, passive detection is carried out on the basis of the waveguide invariant, and the method for using the underwater acoustic channel statistics invariant features to achieve passive ranging has good adaptive capacity to uncertain factors of the marine environment; due to the fact that a double-array-element model is adopted, a device is simple and convenient to use, the calculated amount is small, target movement parameter information can be calculated by using data of only two array elements, and passive detection of the target is achieved.

The invention discloses a target positioning method and system of full passive detection. The method includes co-station deploying a photoelectric detection system and a radio detection system; fusing, by the matching of an azimuth, the azimuth information and the elevation angle information of a target acquired by the photoelectric detection system of a host station and the azimuth information and the frequency point information of the target acquired by the radio detection system, so as to obtain the azimuth information, the elevation angle information and the frequency point information ofthe target; for the azimuth information, the elevation angle information and the frequency point information detected by different stations, performing target registration by the frequency point information of the target so that according to the location information of different stations, the photoelectric detection systems of different stations performs cross-positioning calculation on the azimuth information and the elevation angle information acquired by the target at the frequency point, and obtains the distance information between the photoelectric detection system of different stations and the target, thereby obtaining the azimuth information and the elevation angle information of the target and achieving target positioning.

The invention discloses an optical axis monitoring method and device for a high-precision active / passive detection system. The device comprises a laser emission system, an optical axis separation assembly, a common telescope, an optical axis monitoring camera, a passive imaging system and a laser reception system. By utilizing a characteristic that an included angle between prism incident light and prism emergent light in an incident plane is only related to the an included angle of a prism reflecting surface, and by means of introducing an optical axis separation component and the optical axis monitoring camera and the like to the high-precision multi-optical axis active / passive composite detection system, a relative relation between a laser emission optical axis and a passive imaging system optical axis is established, so that variation conditions of each optical axis can be monitored in real time in the working process of the high-precision active / passive detection system, and on the basis of the obtained optical axis variation data, detection data can be corrected in the following data processing. The method and the device have the advantages of high optical axis monitoring sensitivity, good self optical axis stability and mature processing and adjusting technology and the like, and can be widely applied to an airborne and satellite-borne high-precision active / passive compound detection optoelectronic system.

The invention relates to a target identification method based on cooperative passive detection multidimensional information. The invention aims at a multi-station radar cooperative detection system, and mainly aims to solve the problem that a target platform equipped with a fixed radar combination cannot be identified as it is impossible to simultaneously identify multiple pieces of radar workingat different bands in single-radar passive detection because of limited frequency resources. The method includes the following steps: (1) a local station exchanges information with other cooperative stations, and the detection band and the detection range are made clear; (2) the local station regularly receives a target EDW and model information of radar to which the target EDW belongs transmittedby a current other station; (3) the local station carries out platform correlation calculation, determines important identification platforms, calculates and updates the minimum determination radar set of each important identification platform, and guides the other stations in detection; and (4) when an EDW and the model of radar to which the EDW belongs acquired at a time can completely cover the minimum determination radar set of a platform, the local station carries out range consistency determination, and outputs a platform determination result. According to the invention, the identification accuracy of a passive detection platform can be improved.

The invention discloses a universal UUV (Unmanned Underwater Vehicle) underwater target detection simulation method and system. The method comprises the following steps that: receiving a selected detection mode, wherein the detection mode comprises active detection and passive detection; if the active detection is selected, starting the active detection, and obtaining a target detection result; and otherwise, starting the passive detection to obtain a target detection result. By use of the method and the system, the simulation research service of UUV capacity building can be provided, and through the modeling of typical underwater sound detection equipment and a detection process, a standardized and generalized underwater target detection model is provided.

The invention discloses a low-altitude target tracking information fusion method and system based on a multi-source detector. The method comprises the steps of enabling each detection station device to detect and measure the distance of an obtained image of a target appearing in a view field; obtaining position information of a target relative to each detection station device and feature information of the target; each detection station device uploads detected target position information and target feature information to an information fusion system, and the information fusion system determines a target geocentric coordinate system coordinate according to the target position information uploaded by each detection station device; fusion matching of time data and space data is carried out onthe target position information and the feature information uploaded by each detection station device; and the state information of the target is detected according to the fusion matching result. Themeasurement target information of the active detection station and the passive detection station is fused to realize advantage complementation, and the target accurate position information and the target type are obtained through information fusion calculation.

Methods and apparatus are disclosed for wirelessly communicating among integrated circuits and / or functional modules within the integrated circuits. A semiconductor device fabrication operation uses a predetermined sequence of photographic and / or chemical processing steps to form one or more functional modules onto a semiconductor substrate. The functional modules are coupled to an integrated waveguide that is formed onto the semiconductor substrate and / or attached thereto to form an integrated circuit. The functional modules communicate with each other as well as to other integrated circuits using a multiple access transmission scheme via the integrated waveguide. One or more integrated circuits may be coupled to an integrated circuit carrier to form Multichip Module. The Multichip Module may be coupled to a semiconductor package to form a packaged integrated circuit.

The invention discloses a non-contact detection device and method for electric wires embedded in a wall body, and belongs to the technical field of electric wire detection. The detection device comprises an irradiation source, an optical mechanical scanning device, a millimeter wave detector, a signal processing circuit and an image display module, wherein the irradiation source comprises a noiseirradiation source and a microwave emitting antenna; the optical mechanical scanning device is used for carrying out two-dimensional beam scanning on the wall body to obtain millimeter waves emitted by the electric wires embedded in the wall body; the millimeter wave detector performs amplification and detection processing on the received millimeter waves and outputs the processed millimeter wavesto the signal processing circuit for performing processing; and a periodic maximum equiamplitude signal is obtained, so that position information and / or trend information of the electric wires is obtained and is displayed in the image display module. The invention further provides the detection method, which comprises a passive detection mode and / or an active detection mode. According to the detection device and method, the electrified and non-electrified electric wires embedded in the wall body can be detected in a non-contact mode.

The invention discloses a wireless network detection method suitable for a high-speed mobile environment, which is a method combined with an active detection technology and a passive detection technology for judging change of link quality according to a detection result and for dynamically adjusting the detection strategy self-adaptively. Operation steps of the method are as follows: initiating detection, integrating a detection result and adjusting a detection strategy. Due to the fact that the active detection technology and the passive detection technology are combined, the defect that a certain technology is used independently is overcome; the detection period is self-adaptively adjusted according to the change of the link quality, so that the characteristic that the network environment is complex and variable in a high-speed mobile environment is achieved; the problem that the real-time performance and accuracy of wireless network detection of the high-speed mobile network cannotbe guaranteed is solved; and a reliable basis for network resource scheduling in the high-speed mobile environment is provided.

The invention relates to a satellite-borne active and passive integrated detection device. The satellite-borne active and passive integrated detection device comprises a reflecting surface part, an active part, a passive part, an expansion mechanism and a data processing system, wherein the reflecting surface part is shared by the active part and the passive part, the passive part is arranged on the active part and is arranged at the top of a satellite loading cabin by the expansion mechanism, and the data processing system is arranged in a satellite. By effective combination of active detection and passive detection, satellite-borne detection and data fusion inversion are expanded, the defects of high detection accuracy while low space resolution (generally dozens of kilometers dimension)of passive detection and the defects of high space resolution (generally several meters to several kilometers dimension) while low accuracy of active detection can be overcome, and high-space resolution and high-accuracy soil humidity and freezing and thawing state detection can be achieved.

The invention relates to the fields of hydroacoustic engineering, oceanographic engineering and sonar technology, in particular to a method for increasing passive sonar operating distance by means of shallow sound field airspace characteristics. The method is suitable for shallow sea target passive detection. The method comprises the steps of placing a short vertical array in a shallow water acoustic channel, establishing conventional beamformer weight vector by means of the spatial aperture of the short vertical array, acquiring the reception directional response of the short vertical array, obtaining the vertical reception directivity to noise data and a remote sound source of the short vertical array, and reasonably adjusting the directivity of the short vertical array to obtain a higher output signal to noise ration by comparing the vertical reception directivity to noise data with the vertical reception directivity to the remote sound source. According to the method, the difference between the reception directional response to ambient sea noise and the reception directional response to a remote sound source radiator signal of the vertical array in shallow sea is fully utilized, the output signal to noise ration of a received signal is increased, and then the operating distance of a passive sonar is increased.