Abstract: In one embodiment, a radar communication system includes a plurality of radars having a communication range and being capable of operating at a sensing frequency and a reporting frequency, wherein the reporting frequency is different than the sensing frequency, each radar is adapted for operating at the sensing frequency until an event is detected, each radar in the plurality of radars has an identification/location frequency for reporting information different from the sensing frequency, a first radar of the radars which senses the event sends a reporting frequency corresponding to its identification/location frequency when the event is detected, and all other radars in the plurality of radars switch their reporting frequencies to match the, reporting frequency of the first radar upon detecting the reporting frequency switch of a radar within the communication range. In another embodiment, a method is presented for communicating information in a radar system.

Abstract: Systems and methods for detecting objects and weather in space are disclosed. A system for detecting an object in space and space weather includes at least one spacecraft, at least one radiation source, at least one detector, and a controller. The at least one radiation source and the at least one detector are coupled to the at least one spacecraft. The at least one radiation source is configured to transmit a signal. The at least one detector is configured to detect the signal. The signal may be reflected from an object in space. The controller is coupled to the spacecraft and is in communication with the plurality of detectors. The controller is programmed to calculate either a relative position of the object based or a plasma parameter in a region traversed by the signal based on the detected signal.

Abstract: In certain embodiments, a method for combining data from multiple radar signals on a single PPI includes receiving, from a first radar device having a first angular range of visibility, first radar signal data corresponding to the first angular range of visibility. The method further includes receiving, from a second radar device having a second angular range of visibility, second radar signal data corresponding to the second angular range of visibility. The method further includes performing compensation processing on at least a portion of the second radar signal data to form modified second radar signal data that is correlated to the first radar signal data. The method further includes combining at least a portion the first radar signal data with at least a portion of the modified second radar signal data to form combined radar signal data and generating, based on the combined radar signal data, a display on a radar PPI display.

Abstract: Radar beams for searching a volume are selected by determining the central angle and azimuth and elevation extents to define an acquisition face. The number of beams NMBA required to cover the acquisition face is determined by N MBA = ( 2 ? n + 1 ) ? ( m + 1 2 ) + ( - 1 ) n + m 2 ( 2 ) The number of beams NMBA is multiplied by the dwell per beam to determine the total search time, which is compared with a maximum time; (a) if the total search time is greater than the permissible time, the acquisition face is partitioned, and (b) if the total search time is less, the acquisition face information is applied to a radar processor for filling the unextended acquisition face with the number NMBA of beams in a particular pattern.

Abstract: A conductive line radar comprising at least one signal surface wave launcher, which comprises a signal surface wave transceiver, which is physically attached to a power line. The signal surface wave transceiver transmits a wave signal along the power line with another signal radiating from the wave signal in a plurality of directions along the power line. The at least one signal surface wave transceiver receives reflected signals from a target within a distance of the power line. The at least one signal surface wave launcher includes at least one RF communications transceiver and can be inductively powered from the power line.

Abstract: A system and method for determining the geolocation of a signal emitter moving at an unknown velocity by combining signal data of a target detection platform (e.g., a radar system) and signal data collected by two or more moving signal collection platforms (e.g., RF signal receivers). In one embodiment, the target detection platform determines tentative location and velocity of the signal emitter, and the signal collection platforms are configured to perform TDOA and/or FDOA analysis of the collected signal data corresponding to a signal of the signal emitter. In one embodiment, solutions provided from the TDOA and/or FDOA analysis are unbiased by using the tentative velocity of the signal emitter, and the geolocation of the signal emitter is determined by matching the TDOA/FDOA solutions and the detected tentative location.

Abstract: The present invention is directed to a system and method for the identification of a target object in PCL radar applications. The disclosed embodiments describe the systems and methods used in the identification of a target object from the collection of data representing specific target object features, such as velocity, altitude, fuselage length, wing length, or wing sweepback angle, and the comparison of selected target object features with a database of known aircraft features. The present invention also provides for the calculation of feature dimensions, such as the fuselage length, wing length, or wing sweepback angle from measurements associated with a peak signal lobe as a function of a bistatic aspect angle.

Abstract: A radar activation multiple access system and method is provided that includes a plurality of radar participant nodes wirelessly connected and forming a radar network and a multiple access unit in communication with the radar network. The multiple access unit includes a scheduler component, a synch component, a priority component and a radar activation component. The scheduler component is configured to schedule a period of operation having a plurality of time divisions within the period of operation. The synch component is configured to synchronize the radar participant nodes within the period of operation. The priority component is configured to assign a priority to individual radar participant nodes in the radar network. The radar activation component is communicatively connected to the radar network and configured to determine a contentious state at a time division in the period of operation.

Abstract: Current targeting approaches involve guiding to a spatially derived guidepoint of a group of objects likely to be the preferred object. This method may not allow the intercepting missile to contain the preferred, or other probable object(s), within its divert capability. The guidepoint is shifted closer to the preferred object using specific energy and angular momentum, constants of orbital motion, which describe properties of an object's trajectory. Guiding to the specific energy derived guidepoint does not offer significant benefit over guiding to the spatially derived guidance point. However, computing the spatial rate of change of specific energy within the plane formed by the guidance objects establishes a vector pointing close to the preferred object. This is the direction to shift the guidepoint in order to contain the preferred object within the interceptor's divert capability.

Abstract: A method and system for extending the electronic operational range of a slow vehicle, such as a ship, by using a remotely controlled unmanned faster vehicle, such as an Unmanned Aerial Vehicle (UAV), and by way of example a remotely controlled drone. More particularly, the present invention relates to a method and system for extending the Electronic Warfare (EW) support for a ship.

Abstract: Techniques disclosed herein include systems and methods for accurately scheduling radar and radio events against each other. Specifically, a scheduling manager can schedule radar events based on scheduled radio events (wireless network communication events). A given radio schedule for a compact radar sensor can be a relatively complicated schedule, especially when the compact radar sensor operates as part of an ad hoc network. In certain embodiments, the scheduling manager identifies a radio transmission schedule of neighboring radar nodes or compact radar sensor units. Such a radio transmission schedule of neighboring nodes can include information on when neighboring nodes will be receiving or transmitting data. The scheduling manager then schedules radar events to be executed by the radar device at available times, or at times that do not overlap with scheduled radio events.

Abstract: An expandable and reconfigurable instrument node includes a feature detection means and a data processing portion in communication with the feature detection means, the data processing portion configured and disposed to process feature information. The instrument node further includes a phase locked loop (PLL) oscillator in communication with the data processing portion, the PLL oscillator configured and disposed to provide PLL information to the processing portion. The instrument node further includes a single tone transceiver and a pulse transceiver in communication with the PLL oscillator, the single tone transceiver configured and disposed to transmit or receive a single tone for phase correction of the PLL oscillator and the pulse transceiver configured and disposed to transmit and receive signals for phase correction of the PLL oscillator.

Abstract: An apparatus and method for protecting against incoming projectiles comprising transmitting two radar waveforms, the first waveform comprising a pulsed continuous wave waveform, and the second waveform comprising a pulsed linear chirp waveform over a bandwidth, and based on returned radar data, causing deployment of a defense mechanism to intercept a detected incoming projectile.

Abstract: An exemplary system and method are for tracking a target in a decentralised network having a plurality of sensing nodes. Each node makes observations of a target, performs a multiple models tracking algorithm based on the observations, and updates tracking information stored therein. Each node communicates the updated track information to selected other nodes in the network. In response to receiving track information from another node, each node fuses the receiving track information with local track information.

Abstract: Certain embodiments provide a network waveform system that can include multiple radars disposed at different geographical positions within an environment. The multiple radars may be configured to transmit a network waveform. The network waveform may include multiple radar waveforms. Each radar waveform of the multiple waveforms may be transmitted by a specific radar of the multiple radars. The system can also include a computer system coupled with the multiple radars that can include a processor and a memory. The memory may be configured to store information including data received from the multiple radars, data processed by the processor, and processing code executable by the processor. The processing code may include instructions to receive output data from the multiple radars resulting from the transmitted network waveform instructions to jointly process the output data from the multiple radars to determine a measurement of the environment based on the network waveform.

Abstract: An apparatus comprises a transmitter system, a receiver system, and a processor unit. The transmitter system transmits first and second collimated beams having a first and second frequency. The receiver system monitors for a fundamental difference frequency signal having a difference frequency equal to a difference between the first and second frequency and a number of harmonics of the fundamental difference frequency signal. These signals are generated by an object having non-linear electrical characteristics in response to the collimated beams. The processor unit is connected to the transmitter system and the receiver system. The processor unit controls the transmitter and receiver systems to change at least one of the first and second frequencies through a range of frequencies and detect a range of fundamental difference frequency signals and the number of harmonics of the fundamental difference frequency signal in response to transmitting the collimated beams using the range of frequencies.

Abstract: A method for mitigating against a clutter source or other interferer in a high precision radar is disclosed. The clutter source or interferer may be a wind farm. The method includes positioning a plurality of relatively low resolution radars, such as low cost marine navigation radars, in or about the interferer, and fusing data from them together, to produce object positional data of increased accuracy. One or more of the radars may be adapted to have a radiation beam pattern directed more towards the vertical, and such adapted radars may advantageously be located more centrally within the interfering region. Data from the individual radars may be fused in any suitable manner, and other information, such as ADS-B broadcasts may be included. Data relating to aircraft may be supplied to operators to supplement air traffic control, and air defence radars, and data relating to shipping around sea based wind farms supplied to vessel traffic system radar operators.

Abstract: A method of selecting a sub-set of a plurality of available sensors to guide an interceptor to a target is described. The method includes characterizing a quality of position estimate received from each of the plurality of available sensors, projecting the positioning errors of the sensors onto a plane normal to a line-of-sight of the interceptor, and selecting the sub-set of the plurality of available sensors based on the projection of positioning errors.

Abstract: The invention proposes utilizing the known geometry of the measurements in order to assign them to one another and to resolve ambiguities, wherein the 3D position of an object (3) in space is determined by a spatial section at the same time.

Abstract: A radar array linearly traverses an area of ground. Additional radar elements fore and aft of the array detect changes in elevation and orientation of the array. These elements act as a preview for the height changes due to ground variation. Any variation in height that is not detected by these fore and aft-mounted elements is thus due to variation in radar elevation and/or orientation and can be subtracted from the resulting data without introducing distortion. Correction factors are applied to the range data returned from each element in the array, which normalizes the data and makes it appear as if the array did not change orientation or elevation.

Abstract: The invention relates to a high-resolution synthetic aperture radar device (10) comprising at least one transmitting antenna (TX1-TX3) for producing and emitting radar pulses for scanning an object (12), a receiving antenna (14) for receiving the radar beams (20, 22, 24) emitted and reflected by an object, wherein the receiving antenna (14) has several sub-apertures (RX1-RX17) arranged along elevation, which form a minimum of azimuth apertures, wherein the high-resolution synthetic aperture radar device is embodied such that pulse signals (18) are emitted at irregular time intervals.

Abstract: A moving sensor suite for imaging a scene has three Doppler radars, two moving and one fixed, a fixed video camera and a fixed GPS receiver. The Doppler radars measure the relative velocities between the radars and the scene, as well as the scene's electromagnetic reflectivity, while the video camera records the motion of the camera and the optical property of the scene. The correct registration of the Doppler radars and the camera is established by finding the intersections of the moving Doppler radar motion vectors with the image plane of the video camera. The scene features in the first frame are determined by Doppler circle intersections. The correspondences of the features in the next two frames are established by a feature matching operation.

Abstract: A system and method for antenna radiation pattern sweeping in wireless networks, e.g., cellular networks, are disclosed. For example, the system comprises a first base station associated with a first antenna assembly for providing a first antenna radiation pattern over a first footprint of a first cell, a second base station associated with a second antenna assembly for providing a second antenna radiation pattern over a second footprint of a second cell, wherein there is an overlap between the first footprint and the second footprint, and a controller for controlling the first base station and the second base station to continuously provide a variation of the first antenna radiation pattern and the second antenna radiation pattern in a co-ordinated manner for maintaining the overlap between the first footprint and the second footprint.

Abstract: A surveillance apparatus (100) is provided, said apparatus including a linear sub-array (101) of N omnidirectional transmitter elements (103) and a planar sub-array (102) of M receiver elements (104). A plurality of the transient elements (105) are generated by separating out at each of the receivers (104) the signals transmitted from the antenna elements (103) of the transmitter sub-array (101). This allows the geometry of each path (from each transmitter antenna element, to the point being imaged and back to the receiver antenna elements) to be converted to a delay or phase shift to focus on the particular point being imaged. The transient elements (105) form a cylindrical array (106) at the mid points between transmitter and receiver sub-arrays. Such a configuration enables a full 360 degrees of cover in azimuth and typically +/?60 degrees in elevation.

Abstract: A method for simultaneously tracking a plurality of objects and registering a plurality of object-locating sensors mounted on a vehicle relative to the vehicle is based upon collected sensor data, historical sensor registration data, historical object trajectories, and a weighted algorithm based upon geometric proximity to the vehicle and sensor data variance.

Abstract: This scanning array scans an area around the array for nearby objects, collision obstructions, and terrain topography. The scanning array can scan for sounds emitted by objects in the vicinity of the scanning array, passive energy receipt sources, or it can also send out an energy beam and scan for reflections from objects within the energy beam. The energy beam can be optical, laser, radar or other energy emitting sources. The scanning array of the invention can be used for helicopter detection and avoidance of collision risk and can be used for other scanning purposes. Scanning of an entire hemisphere or greater is accomplished by manipulating the scanner platform through the coordination of either linear actuators or gimbals so as to produce nutation without rotation. This motion allows transceivers to be directly coupled to transmitting and sensing modules without the losses associated with slip rings and other coupling devices.

Abstract: A radar imaging system for capturing an image of an object within an area of interest through at least one visual impairment. The radar imaging system comprises at least one radar array. The radar array includes a plurality of transmitter elements and a plurality of receiver elements for receiving a plurality of coded return signals from an object through the at least one visual impairment.

Abstract: A method for asynchronous transmission of communication data between periodically blanked terminals separated by an unknown distance is disclosed. A bursted signal is transmitted from a first terminal with a burst time tB and a burst cycle period T. The bursted signal is received at a second terminal. A bursted response signal is transmitted from the second terminal to the first terminal. The bursted response signal has a burst cycle period of T/2 and includes a pair of response bursts, with each burst in the pair having a burst time tA?T/2?tB. Each burst in the pair of response bursts carries an identical data payload. At least one of the response bursts is received at the first terminal.

Abstract: A vehicle system includes a signal processing module and a first antenna that provides a first transmitted signal that has a first phase. A second antenna of the system provides a second transmitted signal that has a second phase that differs from the first phase. At least one receive antenna of the vehicle system receives first and second received signals that correspond to the first and second transmitted signals, respectively. The signal processing module processes the received first and second signals based on the first and second transmitted signals and selectively controls transmissions of the first and second transmitted signals.

Abstract: A method for determining a path of travel of an intruder traversing an area of regard (AOR) to a predefined point, where the path of travel has a minimum probability of detection relative to other potential paths of travel of the intruder. The method may comprise: providing three dimensional terrain data concerning the AOR; providing the locations of a plurality of detection sensors implemented in the AOR, with each detection sensor having a known field of view; providing a predetermined single scan detection probability for each of the detection sensors; generating a grid of points that is laid over the AOR; and using the foregoing information to determine a particular path of travel, defined by selected arcs connecting specific ones of the grid of points, of the intruder to the predefined point that represents a minimum probability of detection of the intruder.

Abstract: A real-time radar surveillance system comprises at least one land-based non-coherent radar sensor apparatus adapted for detecting maneuvering targets and targets of small or low radar cross-section. The radar sensor apparatus includes a marine radar device, a digitizer connected to the marine radar device for receiving therefrom samples of radar video echo signals, and computer programmed to implement a software-configurable radar processor generating target data including detection data and track data, the computer being connectable to a computer network including a database. The processor is figured to transmit at least a portion of the target data over the network to the database, the database being accessible via the network by at least one user application that receives target data from the database, the user application providing a user interface for at least one user of the system.

Abstract: A phased array radar antenna includes at least two antennas (11, 12, 13, 14) adapted for simultaneous operation at different non-mutually interfering frequencies. The phased array radar antenna may be fitted to an aircraft having a fuselage supporting first and second radar side antennas (11, 12) on opposite sides thereof, a nose portion supporting a first radar end antenna (13), and a tail portion supporting a second radar end antenna (14). Respective radomes cover the first and second radar end antennas so as to provide a smooth aerodynamic contour, and a radar control unit (15) is disposed within the fuselage and coupled to the first and second radar side antennas and to the first and second radar end antennas for operating the first or second radar side antenna simultaneously with the first or second radar end antenna at respective first and second different frequencies.

Abstract: A method of tracking an object including the steps of: collecting N measurements of range Ri and Doppler velocity Di associated with the object from a plurality M of radar sensors Si each measurement being assigned a time stamp ti; time aligning each Range Ri measurement to a common time stamp tN to provide a corresponding time aligned range Pi for each of the N measurements; using each time aligned Range measurement Pi to define a corresponding spherical equation such that N spherical equations are defined; and deriving analytical solutions from three of the N spherical equations to determine the position vector of the object.

Abstract: An apparatus or a method for preventing radio-frequency (RF) interferences between rotating antennas. For example, the invention is particularly applicable to radar and communication systems on board naval ships.

Abstract: In a multi-radar system, configured comprising a plurality of radar units which generate and output signals the frequency of which increases and decreases periodically, each radar unit generates and outputs signals synchronized with a prescribed sync signal, such that the upper limit and lower limit of the periodically increasing and decreasing frequency is different for the signals of each radar unit, and moreover the timing of the upper limit and lower limit of the signals substantially coincide. By this means, the frequency intervals between signals can be reduced, and more channels can be set, without causing radio wave interference.

Abstract: A detection system comprises a transmitter unit, a receiver, and a processor. The transmitter unit is capable of transmitting a first collimated beam having a first frequency and a second collimated beam having a second frequency into a ground, wherein the first collimated beam and the second collimated beam overlap in the ground. The receiver is capable of monitoring for a response radio frequency signal having a frequency equal to a difference between the first frequency and the second frequency. The response radio frequency signal is generated by an object having non-linear conductive characteristics in response to receiving the first collimated beam and the second collimated beam. The processor is capable of controlling an operation of the transmitter unit and the receiver. The processor is connected to the transmitter unit and the receiver. The object is detected when the response radio frequency signal is detected by the receiver.

Abstract: An object detecting apparatus for detecting an object by a plurality of radars, with improved accuracy of identity determination and acquisition of position information in fusion of detection results. The object detecting apparatus is arranged to obtain a moving path of a detected point by a radar and to perform pairing as follows: if a detected point by a radar exists in a region based on the moving path and if a relative velocity thereof is matched with that of the detected point of interest, the detected point is paired as a corresponding detected point.

Abstract: A method and system are provided for merging data from a plurality of multiplexed measurement sources to a decision-maker. The method includes operations for receiving a corresponding plurality of measurements of the data, processing each measurement to respectively obtain local state estimates and local error covariances, determining a corresponding plurality of lag periods, offsetting each of the corresponding event times, supplying to a track fusion center the local state estimates and the local error covariances for summing the pluralities of the local state estimates as a fusion state estimate and the local error covariances as a fusion error covariance. The measurements to be fused are each acquired from its respective source and correspond to an associated sampling period within an acquisition interval. The lag periods represent a wait duration for obtaining the corresponding local state estimates and local error covariances.

Abstract: A system and method for providing entry-point, boundary-line, and presence intrusion detection by means of an intelligent controller process capable of driving both field alert/alarm systems and security station monitoring devices and for providing occupancy warnings and critical status alerts, one embodiment providing runway occupancy warnings and critical runway status alerts to both flight crew approaching an airfield and air traffic controllers managing ground traffic, the system including: a detection system, airfield output devices (including all FAROS, GAROS and CTAF Runway Occupancy Radio Signals (RORS)), an airfield communications network, a centralized data processing unit that contains all of the algorithms to drive light control, logging, and an optional administrative network layer that hosts a graphical user interface.

Abstract: A radar device includes a generation unit, a transmission unit, and a control unit. The generation unit selectively generates a set of a plurality of transmission signals whose center frequencies are different from one another within an assigned frequency band. The transmission unit emits the transmission signals. The control unit controls the generation unit so as to vary the center frequencies for each emission of the transmission signals.

Abstract: The system and method for standoff detection of human carried explosives (HCE) automatically detects HCE (112) up to a range of (200) meters and within seconds alerts an operator to HCE (112) threats. The system (100) has radar only, or both radar and video sensors, a multi-sensor processor (102), an operator console (120), handheld displays (122), and a wideband wireless communications link. The processor (102) receives radar and video feeds and automatically tracks and detects all humans (110) in the field of view. Track data continuously cues the narrow beam radar (118) to a subject of interest (110), (112) the radar (106), (108) repeatedly interrogating cued objects (110), (112), producing a multi-polarity radar range profile for each interrogation event. Range profiles and associated features are automatically fused over time until sufficient evidence is accrued to support a threat/non-threat declaration hypothesis.

Abstract: A method and apparatus determines the shape of an orbiting or airborne object. A radar determines the general location and a telescope is directed toward the object to form an image of background stars, which will be occluded by the object. The image is compared with a memorized star map, to identify the region of the image in the map. Stars visible in the map which are not visible in the image are listed. The invisible stars are paired with next adjacent visible stars to form star pairs. The midpoints are identified of lines extending between star pairs. Segment lines are drawn between a midpoint and the next closest midpoint. The segment lines define an outline of the object.

Abstract: A navigation system having a radar altimeter is disclosed. The navigation system comprises a signal processing unit and one or more antennas in operative communication with the radar altimeter and the signal processing unit. The system further comprises a forward looking radar communicatively coupled to the radar altimeter. The forward looking radar and the signal processing unit are configured to provide forward looking radar measurements, radar altitude measurements from the radar altimeter, and datalink communications within a single forward looking radar scanning sequence.

Abstract: A radar sensor system and method for vehicles. An example radar system includes a processor, a plurality of transceivers having antenna(e). The antenna of the transceivers are located at various points around the vehicle. The transceivers include receive and transmit electronics that are in signal communication with the corresponding antenna. The transmit electronics output radar signals via the antenna. The transmit electronics include a voltage controlled oscillator (VCO), a dielectric resonator oscillator (DRO), a phase locked loop (PLL) component and a direct digital synthesizer (DDS). The receive electronics receive from the antenna any radar reflections corresponding to the outputted radar signals and send signals associated with the radar reflections to the processor. The processor generates output signals based on the signals received from the plurality of transceivers.

Abstract: A phased array radar system comprising a plurality of radiating elements configured in a common array aperture for detecting and tracking targets; and a transmit and receive arrangement responsive to a first control signal for configuring the plurality of radiating elements to define a plurality of sub-apertures from the common array aperture for detecting and tracking short range targets, wherein the plurality of sub-apertures are independently steerable array apertures and include an amplitude taper applied across each of the plurality of sub-apertures to reduce a peak sidelobe level.

Abstract: A method for obtaining weather related information for a portion of the Earth's atmosphere between a mobile platform traversing over a predetermined surface portion of the Earth, and at least one satellite from a satellite constellation. The method involves modifying at least one satellite from the constellation of satellites to include time and location information in wireless signals that are transmitted in real time by the one satellite. The mobile platform receives the wireless signals from the one satellite. An occultation system carried on the mobile platform analyzes the time and position information, in addition to location information pertaining to a real time location of the mobile platform, and to derive real time atmospheric weather related information for a geographic area between the mobile platform and the one satellite.

Abstract: A headlamp control device for a vehicle is provided. The device includes a front sensor, a wheel speed sensor, an Electrical Control Unit (ECU), a first ballaster, a second ballaster, a relay switch, and a power supply switch. The front sensor senses a target vehicle. The wheel speed sensor detects a speed of a reference vehicle. The ECU outputs a switching control signal. The first ballaster generates a first boosting voltage. The second ballaster generates a second boosting voltage. The relay switch supplies an internal voltage to first and second high-beam lamps, or first and second ballasters. The power supply switch turns on in response to a switching control signal.

Abstract: The invention, called “ORSE Track Fusion”, combines sensor tracks from dispersed sites, when limited communication bandwidth does not permit sharing of individual measurements. Since estimation errors due to maneuver biases are not independent for each sensor, optimal fusion of tracks produced by Kalman filters requires transmission of all the filter gain matrices used to update each sensor track prior to the fusion time. For this reason, prior art has resorted to suboptimal designs. ORSE Track Fusion according to aspects of the invention overcomes this disadvantage by propagating, transmitting, and fusing separately calculated covariance matrices for random and bias estimation errors. Furthermore, with ORSE, each sensor can have its own criteria in forming its track, and track fusion can be performed with different criteria at each processing site. Thus, ORSE Track Fusion has the unique flexibility to optimize track fusion simultaneously for multiple criteria to serve multiple users.

Abstract: A radar system includes radars and a controller. The controller controls waveform patterns of the radars. As a signal processing unit of each of the radars receives an instruction from the controller, the signal processing unit selects a frequency modulation pattern of a VCO between an FM-CW mode and a CW mode stored in a waveform memory to perform mode switching, and then outputs a radio wave from a transmission antenna. Then, the controller instructs each signal processing unit for a frequency modulation pattern of each radar or an output timing of each pattern so that a time, at which continuous wave signals output from the radars have the same frequency, is not continuous.

Abstract: A moving sensor suite for imaging a scene has three Doppler radars, two moving and one fixed, a fixed video camera and a fixed GPS receiver. The Doppler radars measure the relative velocities between the radars and the scene, as well as the scene's electromagnetic reflectivity, while the video camera records the motion of the camera and the optical property of the scene. The correct registration of the Doppler radars and the camera is established by finding the intersections of the moving Doppler radar motion vectors with the image plane of the video camera. The scene features in the first frame are determined by Doppler circle intersections. The correspondences of the features in the next two frames are established by a feature matching operation.