Abstract: A testing device for testing a distance sensor includes: a receiver for receiving an electromagnetic free-space wave as a receive signal; an analog-to-digital converter configured to, in a simulation mode, convert the receive signal into a sampled signal; a signal-processing unit configured to: delay the sampled signal or a modulated sampled signal to form a delayed sampled signal or a modulated delayed sampled signal; and modulate, upon the sampled signal or upon the delayed sampled signal, a predeterminable Doppler signature as a characteristic motion profile of a reflecting object to be simulated to form the modulated sampled signal or the modulated delayed sample signal; a digital-to-analog converter configured to convert the modulated or the modulated delayed sampled signal into a simulated reflected signal; and a transmitter configured to radiate the simulated reflected signal or a simulated reflected signal derived from the simulated reflected signal as an output signal.

Abstract: A system simulates a moving target for a radar system under test. The system includes a Doppler simulation circuit (DSC), coupled to an input, to apply a frequency shift to RF pulses received on an RF signal to simulate speed. A signal attenuator coupled to the DSC is to simulate signal attenuation due to propagation loss of the RF pulses in atmosphere. A pulse detection circuit is to detect time of receipt of the RF pulses, including a first time of receipt of a falling edge of a first RF pulse. An I/O controller updates a value of the frequency shift for the DSC and of the signal attenuation for the signal attenuator during a time period between the first RF pulse and one of a second RF pulse or a second time at which the second RF pulse should have been received in case of a missing pulse.

Abstract: A radar monolithic microwave integrated circuit (MMIC) includes a first transmission channel configured to output a first continuous-wave transmit signal based on a local oscillator signal having a first frequency; a first phase shifter provided on the first transmission channel and configured to apply a first phase setting to the first continuous-wave transmit signal to generate a first transmit signal having the first frequency; a first transmit monitoring signal path configured to couple out a portion of the first transmit signal from the first transmission channel as a first transmit monitoring signal; a frequency multiplier configured to receive a test signal and convert it into a multiplied test signal having a second frequency, where the first and the second frequencies are separated by a frequency offset; and a down-conversion mixer configured to mix the multiplied test signal and the first transmit monitoring signal to generate a first mixer output signal.

Abstract: The present invention relates to an apparatus and a method for converting a radar signal for further signal processing in a test bench with a radar target emulator as well as a test bench having such an apparatus. A divider assembly preferably comprises a divider device configured to reduce a frequency and a bandwidth of the radar signal by a first factor for the further signal processing. A multiplier assembly preferably comprises a multiplier device configured to increase a frequency and a bandwidth of the radar signal by the first factor subsequent the further signal processing.

Abstract: Calibration targets for use during calibration and inspection of vehicle onboard radar systems. The calibration targets incorporate materials having different radar reflective and transmissive properties to provide distinct radar return signatures, facilitating identification of the calibration targets from among various radar returns associated with surfaces and objects located in proximity to the calibration targets, thereby reducing clear space requirements associated with target placement and positioning during a vehicle service or inspection procedure.

Abstract: A method and a system for simulation-assisted determination of at least one actual echo point of an object, and a method and an emulation apparatus for emulating a detection target. Here, a predicted object reference point of the object and a predicted sensor device reference point of a sensor device, in particular a radar-based sensor device, are calculated on the basis of an actual object reference point and an actual sensor device reference point and a predicted echo point of the object is calculated on the basis of an emission characteristic of the sensor device, the predicted object reference point, and the predicted sensor device reference point. Moreover, a predicted relative relationship, in particular a spatial relative relationship, is calculated between the predicted echo point and the predicted object reference point.

Abstract: Methods for monitoring of performance parameters of one or more receive channels and/or one or more transmit channels of a radar system-on-a-chip (SOC) are provided. The radar SOC may include a loopback path coupling at least one transmit channel to at least one receive channel to provide a test signal from the at least one transmit channel to the at least one receive channel when the radar SOC is operated in test mode. In some embodiments, the loopback path includes a combiner coupled to each of one or more transmit channels, a splitter coupled to each of one or more receive channels, and a single wire coupling an output of the combiner to an input of the splitter.

Abstract: A test system simulates a moving target for a radar system under test. The test system includes a Doppler simulation circuit, coupled to an input, to apply a frequency shift to RF pulses received on an RF signal generated by the radar system to simulate speed. A signal delay sub-system produces a delay in the RF pulses to simulate distance. A pulse detection circuit is to detect time of receipt of the RF pulses, including a first time of receipt of a falling edge of a first RF pulse. An I/O controller updates a value of the frequency shift for the Doppler simulation circuit and of the delay for the signal delay sub-system during a time period between the first RF pulse and one of a second RF pulse or a second time at which the second RF pulse should have been received in case of a missing pulse.

Abstract: A radar test computing system includes a host interface coupled to a programmable input/output (I/O) controller, which is to interface with propagation path replicator (PPR) circuitry. A processing device is to detect a start signal received from the controller; receive an update request from the controller in response to detection, by the PPR circuitry, of a first radio RF pulse on a RF signal received from the radar system; retrieve scenario data of distance to and speed of the moving target for a second RF pulse expected to follow the first RF pulse; calculate, using retrieved scenario data, values of a frequency shift, a signal delay, and a signal attenuation for the second RF pulse; and send, during a time period between the first and second RF pulses, these values to the controller for use by the PPR circuitry to simulate the moving target for the second RF pulse.

Abstract: A method for estimating phase noise of an RF oscillator signal in a frequency-modulated continuous-wave (FMCW) radar system and related radar devices are provided. The method includes applying the RF oscillator signal to an artificial radar target composed of circuitry, which applies a delay and a gain to the RF oscillator signal, to generate an RF radar signal. Furthermore, the method includes down-converting the RF radar signal received from the artificial radar target from an RF frequency band to a base band, digitizing the down-converted RF radar signal to generate a digital radar signal, and calculating a decorrelated phase noise signal from the digital radar signal. A power spectral density of the decorrelated phase noise is then calculated from the decorrelated phase noise signal, and the power spectral density of the decorrelated phase noise is converted into a power spectral density of the phase noise of an RF oscillator signal.

Abstract: An FMCW radar sensor and method for determining a relative velocity of a radar target, in which an FMCW radar measurement is performed with a transmitted signal whose modulation pattern encompasses mutually temporally interleaved sequences of ramps; from the baseband signals a two-dimensional spectrum is calculated separately for each of the sequences; from a position of a peak in at least one two-dimensional spectrum of the baseband signals, values for the relative velocity of a radar target which are periodic with a predetermined velocity period are determined; a phase relationship between spectral values that are obtained respectively at the same position in the separately calculated two-dimensional spectra is checked for agreement with phase relationships expected for several of the determined periodic values of the relative velocity; and based thereon, an estimated value for the relative velocity of the target is selected from the determined periodic values of the relative velocity.

Abstract: Methods for monitoring of performance parameters of one or more receive channels and/or one or more transmit channels of a radar system-on-a-chip (SOC) are provided. The radar SOC may include a loopback path coupling at least one transmit channel to at least one receive channel to provide a test signal from the at least one transmit channel to the at least one receive channel when the radar SOC is operated in test mode. In some embodiments, the loopback path includes a combiner coupled to each of one or more transmit channels, a splitter coupled to each of one or more receive channels, and a single wire coupling an output of the combiner to an input of the splitter.

Abstract: A radar simulation device for testing a device under test with respect to at least one radar scenario is provided. The radar simulation device comprises a memory, a radar scenario simulator, and two or more antennas. The memory is configured to store the radar scenario with respect to the device under test, and to provide the radar scenario to the radar scenario simulator. The radar scenario simulator is configured to receive a first number of radar signals from the device under test via the at least two antennas, to simulate the at radar scenario by manipulating the first number of radar signals according to the radar scenario and generating a resulting second number of manipulated radar signals, and to transmit the second number of manipulated radar signals to the device under test via the at least two antennas.

Abstract: A traffic radar system (TRS) utilizing an automated test process which aids the operator in quickly conducting comprehensive system tuning fork tests that includes front and rear antennas and stationary, moving opposite, and moving same-lane operations. The automated process has the ability to select the proper radar antenna and proper mode of operation for each step of the test. The process will measure the input fork signals and report if the signals are within the specified tolerance. Optionally, the process can be set to not allow the radar system to enter the normal operating mode if the tuning fork tests have not been successfully completed.

Abstract: A radar system is provided that includes a first radar transceiver integrated circuit (IC) including transmission signal generation circuitry operable to generate a continuous wave signal and a first transmit channel coupled to the transmission generation circuitry to receive the continuous wave signal and transmit a test signal based on the continuous wave signal, and a second radar transceiver IC including a first receive channel coupled to an output of the first transmit channel of the first radar transceiver IC via a loopback path to receive the test signal from first the transmit channel, the second radar transceiver IC operable to measure phase response in the test signal.

Abstract: A system is provided that includes a Doppler radar unit that transmits a first electromagnetic wave having a first frequency, which a test system converts to a first electrical signal having the first frequency. The test system generates a second electrical signal having a second frequency, and mixes the first and second electrical signals to produce a third electrical signal having a third, sum or difference frequency. The third frequency represents a Doppler-shifted frequency caused by reflection of the first electromagnetic wave by a target at a distance from the Doppler radar unit. The test system converts the third electrical signal to a second electromagnetic wave having the third frequency, and transmits the second electromagnetic wave back to the Doppler radar unit for calculation of a speed representing that of the target as a function of the first and third frequencies, from which the Doppler radar unit may be calculated/certified.

Abstract: A radio frequency (RF) obstacle detection system of a vehicle includes an RF radar module that transmits an initial RF signal having a first signal strength and to receive at least one reflected RF signal having a second signal strength based on the initial RF signal. A radar reflector module is coupled to the vehicle and disposed at a first distance remotely located from the RF radar module. The radar reflector module receives the RF signal generated by the RF radar module and efficiently retroreflects the RF signal to generate a reflected signal having a second signal strength back to the RF radar module. A control module determines a second distance between the radar reflector module and at least one obstacle remotely located from the vehicle based on the reflected signal provided by the radar reflector module and a received signal induced by the at least one obstacle.

Abstract: An apparatus for testing the performance of a synthetic aperture radar is provided. The apparatus for testing the performance of a synthetic aperture radar includes: a three-axis motion platform that is coupled to an antenna and driven in roll, pitch, and yaw directions so as to reproduce motion components generated from a pointing plane of the antenna; a target simulator configured to reproduce a ground target; and a system simulator that allows the three-axis motion platform and the target simulator to work in conjunction with each other in real time, and controls the three-axis motion platform and the target simulator. Here, the three-axis motion platform may include a three-axis driver that determines the attitude of the three-axis motion platform, based on position and speed information received from the system simulator.

Abstract: A method for measuring certain parameters of the impulse response of a propagation channel involving emitters and reflectors that are fixed or mobile, and for detecting and determining the parameters regarding the position and kinematics of the emitters and reflectors, or for auto-locating the reception system implementing the invention, in a system comprising N sensors receiving signals from the emitters or from the reflection on the reflectors. The method determines an ambiguity function which couples the spatial analysis and the delay-distance/Doppler-kinematic analysis, and determines at least one sufficient statistic ?(l,m,K) corresponding to the correlation between the known signal s(kTe) corresponding to the complex envelope of the signal emitted and the output of a filter w(l,m) where l corresponds to a temporal assumption and m corresponds to a frequency assumption.

Abstract: A high fidelity simulation of Doppler that may exactly replicate the phenomenology of the physical world. Compute the linear (Line of sight) kinematics (Slant Range, Radial Velocity, and Radial Acceleration) for each of a multiplicity of emitter-receiver pairs in accordance with exact 3D vector mathematics. Smoothly interpolate the linear kinematic parameters to produce accurate instantaneous values of these parameters at sample rates sufficient to produce negligible error effects in the presence of realistic aircraft maneuvers. Calculate the Doppler frequency, in accordance with well known physics, from the emitter carrier wavelength and a high sample rate. Calculate the Doppler effect as a differential phase (Doppler frequency×sample time) and apply the effect as incremental phase shifts to the carrier signal.

Abstract: The described method characterizes scattering objects in a wireless channel. The present invention determines non-equally spaced path delays and Doppler parameters for a plurality of scattering objects in a wireless channel. More particularly, a frequency-to-time transform applied to a plurality of OFDM pilot samples received over a plurality of OFDM symbol periods generates a set of non-equally spaced path delays and a set of associated complex delay coefficients. Further, a time-to-frequency transform applied to the complex delay coefficients determined for one path delay over multiple OFDM symbol periods generates a set of Doppler parameters comprising a plurality of non-equally spaced Doppler frequencies and their corresponding scattering coefficients for that path delay.

Abstract: A simulation device and a system and method for using the simulation device are disclosed. The simulation device may contain a plurality of antenna elements positionable on or near a radar or other sensing device. The simulation device may be configured to control the plurality of antenna elements to transmit signals that simulate a reflection of an electromagnetic signal off of one or more targets of particular sizes at particular azimuths, elevations, distances, trajectories, and/or velocities.

Abstract: A method and system are provided for testing antenna systems using position determination, orientation determination, test pattern analysis using a variety of factors and equipment including positions and orientation of antenna(s) under test at specific points and signal processing systems.

Abstract: Digital data Symbols from a transceiver are transmitted to at least two remote transceivers in a wireless Communications System employing Orthogonal Frequency Division Multiplexing, wherein a number of available sub-carriers are shared between said remote transceivers. Information about magnitudes of Doppler effect experienced by the remote transceivers is provided; sub-carriers are allocated to each remote transceiver in dependence of the information about magnitudes of Doppler effect; and a power level transmitted to each of said remote transceivers is controlled in dependence of the Information about magnitudes of Doppler effect. In this way the reception of OFDM Signals for transceivers moving at high speed and thus experiencing a high Doppler effect is improved without degrading the reception quality for transceivers with low or no Doppler effect. Thus the Performance of a System based on OFDM and multiple access is improved.

Abstract: The present invention provides a method and system of analyzing radar information of a radar system. According to certain embodiments of the invention, the method comprises: providing radar information including at least a portion modified in response to an EWE (electronic-warfare) action; obtaining position data corresponding to at least a position of a target associated with the EW action with respect to the radar system; and analyzing the radar information for comparing it with the position data, thereby allowing to determine at least one effect of the EW action on the radar information.

Abstract: Systems and methods of improving sampling of WLAN packet information to improve estimates of Doppler frequency of a WLAN positioning device. A device estimates the position of itself. The device includes a WLAN radio module for receiving WLAN signals transmitted by WLAN APs in range of said device, extraction logic for extracting information from said received WLAN signals to identify the WLAN APs, and logic to cooperate with a WLAN-based positioning system to estimate the position of the device based at least in part on the extracted information identifying the WLAN APs in the range of said device. The WLAN radio module includes logic for measuring multiple received signal strength indicator (RSSI) values for sufficiently long WLAN packets to increase the sampled rate of RSSI of WLAN packets from WLAN APs and to thereby improve an estimate of the Doppler frequency of said device.

Abstract: A device (100) adapted to simulate a radar signal reflected from a moving target including a receiver (120) for receiving a radar signal and a device (108, 114A, 114B, 116A, 116B, 118) for modulating the radar signal with a Doppler frequency to produce a modulated signal simulating the radar signal reflected from a moving target. The device further includes a transmitter (124) for transmitting the modulated signal. The device for modulating the radar signal is arranged to simulate the radar signal reflected from a simulated moving target having a length selected by a user.

Abstract: A method for evaluating uncertainty associated with the value of a measurand derived from measurements of a device under test is disclosed. A mathematical model is provided wherein the measurand is expressed as a function of (i) at least one physically observable quantity, and (ii) the reference value of the physically observable quantity in a reference device. The reference value of the reference device and the value of the measurand of the device under test are measured. The value of the at least one physically observable quantity is also measured. At least one uncertainty value is determined as a function of the physically observable, wherein the mathematical model takes into account the at least one source of uncertainty and the reference value of the reference device.

Abstract: A Doppler compensation method is used for radio transmission between a mobile body possibly but not exclusively a train and some base station, both mobile body and base station comprise respectively a transceiver connected to an antenna for the radio transmission. The method comprises the step of determining the direction of motion of the mobile body with respect to the active base station i.e. the base station to which a radio transmission link is just built. The method is then followed by the step to apply a constant Doppler compensation corresponding to the cancellation of the Doppler effect for a mobile body moving in the same direction at predefined limiting speed of motion (vlimit) at which a quality threshold is reached with the used radio transmission technology in the case without a Doppler compensation.

Abstract: A radar system and method is provided, in which the radar system includes a first transmitting portion of antenna elements, a second transmitting portion of antenna elements, and a receiving portion of antenna elements, such that the receiving antenna elements form a plurality of subarrays that represent real and synthetic antenna elements. The radar system further includes a transceiving device having a switching matrix. At least first and second switching transmit antenna elements are configured and time-multiplexed, wherein a receive aperture of the receiving antenna elements is increased.

Abstract: A system for testing radar in accordance with one embodiment comprising a target motion platform; a target motion platform controller for controlling motion of the platform; a radar responsive tag and a delay line located on the target motion platform; the radar which is being tested; and a motion measurement simulator for inputting data to the radar electronics assembly to simulate movement of the radar. In some embodiments the system further comprises a radar motion platform, wherein the radar electronics assembly is positioned on the radar motion platform; a radar motion platform controller for controlling the movement of the radar motion platform; and a master controller coupled to the radar motion platform controller and the target motion platform controller.

Abstract: A system and method is provided for detecting emitter signals and for determining a scan strategy for a receiver system that receives such emitter signals. Once a scan strategy is computed, it may be desirable to evaluate the scan strategy's intercept performance against a given emitter set under specific altitude, range and receiver load conditions. 2D and 3D emitter scan patterns are modeled and simulated. The receiver scan is also modeled and simulated. Performance statistics from the simulation are collected and analyzed.

Abstract: Systems and methods enable numerically creating a flat field in a compact radar range with a curved reflector, and without use of a separate phased array of elements, at frequencies lower than those that are possible with currently known, reflector-only compact radar ranges. A compact radar range is calibrated to enable weighting factors to be computed. The weighting factors may be computed by performing an optimization algorithm. The weighting factors are used to weight separate target signals sequentially returned from a target zone such that, when combined, a numerically composite measurement has a substantially constant magnitude across the target zone.

Abstract: The present invention relates to a monitoring device (1) with a transmitter unit (2) and a receiver unit (3) for monitoring an area. Slotted cables serve as antennas. According to the invention, a first slotted cable is arranged as a transmitting an antenna (4) for transmitting a pulsed high-frequency signal and a second slotted cable is arranged as a receiving antenna (9) for receiving the reflected signal. The slotted cables are arranged in association with each other and essentially parallel to each other, and the transmitter unit (2) is connected to the first slotted cable at one end of the antenna arrangement and the receiver unit (3) is connected to the second slotted cable at the other end of the antenna arrangement.

Abstract: A method and communications receiver is disclosed that removes Doppler frequency shift in a spread spectrum communications signal. A pilot channel rake section has I and Q Doppler estimation channels for estimating the Doppler change in frequency based on a common pilot channel. A data channel rake section has I and Q data channels for receiving the Doppler change in frequency from the pilot channel rake section and canceling any Doppler error.

Abstract: A radio frequency (RF) converter system and associated method are provided for generating and/or receiving RF signals. Included is a signal conversion circuit for digital signal processing (DSP) or converting between digital signals and analog signals. Further provided is a shifting circuit in communication with the signal conversion circuit. In transmit mode, the shifting circuit is adapted for at least one of frequency shifting and phase shifting the signals, as a function of either an oscillating signal or a baseband signal to generate modulated signals. Further included are a transmit/receive port and a termination circuit in communication with shifting circuit for transmitting the modulated signals and selecting a portion of the transmitted modulated signals, respectively. Still yet, an output filter or mixer may be provided. In receive mode, the shifting circuit is adapted for receiving a non-varying DC signal from the signal conversion circuit.

Abstract: A method for simulating a Doppler signal under stationary conditions is described. The method includes sampling a radar return signal at an integer multiple of the return signal frequency plus a fraction of the return signal period and generating a base band signal from the samples.

Abstract: An apparatus for electronic warfare signal simulation which is used in an external test system to simultaneously test a plurality of “victim” communication systems for vulnerability to jamming. The test system includes a remote radiator of a signal free of jamming effects, and a remote radiator of one or more radio frequency control signals which represent one or more predetermined jamming threats in the low and mid bands.

Abstract: A radar test system for testing the performance of an automotive radar system includes circuitry for multiple down and up conversions of a signal from the automotive radar. Conditioning circuitry is further included to delay an intermediate frequency signal (IF2) obtained after the second down conversion to simulate the delay of a return signal from an object located a particular distance from the automotive radar system, and to attenuate the IF2 signal to simulate variable target sizes, and to generate a Doppler shift in the IF2 signal to simulate target speed. The conditioned signal is up-converted and transmitted back to the automotive radar system to determine if the automotive radar provides accurate readings for distance, size and speed.

Abstract: A device for generating a desired transit time delay of a pulsed radar signal is characterized in that a delay line (13) with signal input and signal output for the pulsed radar signal is provided whose transit causes time delay &tgr; of the pulsed radar signal, that a signal amplifier (14) is connected downstream of the delay line which increases the amplitude of the pulsed radar signal by a certain amplification factor f, and that a decoupling device (12) is provided which permits supply of at least part of the amplitude of the pulsed radar signal coming from the signal output of the signal amplifier to the signal input of the delay line again and which permits, after n times transit of the pulsed radar signal through the delay line, decoupling of at least part of the amplitude of the pulsed radar signal, wherein T=n·&tgr; and wherein n is a natural number.

Abstract: The present invention relates to a method and a system for compensating for doppler shift in a signal transmitted between a mobile station and a base station in a mobile communication system. In the method the doppler characteristic is determined for two selected portions of the received signal, the doppler characteristic being in the form of a phased offset for each selected portion. The larger phase offset is them used as a doppler characteristic to provide a doppler shift compensation for the received signal.

Abstract: A method for simulating echo signals for Doppler radar systems having a radar signal transmitted by a first Doppler radar system and received by a second Doppler radar system wherein the signal is subjected to the action of a Doppler frequency shift based upon switching of either an antennae changeover switch or a transmitting and receiving changeover switch at a frequency equivalent to the Doppler frequency shift to be generated and sent back as a simulated echo signal.

Abstract: A method and device for testing the function of a radar. A diode (21) with variable radar radiation impedance is arranged in the beam path (23) inside the antenna unit (4, 6) of the car radar and is fed with alternating current for simulating a radar target at a distance from the antenna unit. The obtained target data for the simulated target are compared to the expected target data for testing the function.

Abstract: An automated simulator for radar and sonar applications. The inventive simulator is implemented in hardware and generates current parameters with respect to a simulated target in response to a plurality of initial values with respect thereto. In the illustrative embodiment, the initial values include range, velocity, and acceleration and are stored in first, second and third register respectively. In the best mode, the invention is implemented in a field-programmable gate array. The inventive target simulator also includes a range delay circuit for generating a simulated return from the simulated target. The range delay circuit includes logic for determining whether a simulated pulse train to be received is ambiguous or unambiguous and adjusting the pulse repetition rate of the pulse train accordingly. The range delay circuit calculates die initial time that a packet needs to make the trip to and from the target.

Abstract: A system is disclosed for generating simulated radar targets that eliminates the necessity for large outdoor test ranges and is relatively low in cost. The simulated radar target generating system provides complex targets of given simulated dimensions at given simulated distances when stimulated by signals emitted by the radar sensor in the sensor's operational frequency. The dimensions are simulated by the use of multi-tap delay device while the distances (or, range) are simulated by routing the signal, in the form of light, through a fiber optic delay of a desired length. This system, which costs less than $50 thousand, can be located as close as eight feet to the sensor under test.

Abstract: A radar target simulator outputs multiple video and timing signals for a selected radar type from a single computer bus card slot. Several targets including cluster targets may be simulated at conveniently selectable signal-to-noise ratios. Multiple radar types may be simulated concurrently using additional bus card slots in a single desktop computer.

Abstract: A digital radar landmass simulator (DRLMS) used for stimulation testing pulse radars, wherein the DRLMS operates by synthesizing time-overlapping chirp waveforms using finite impulse response filters. The DRLMS, thus, effectively generates many overlapping complex pulse signals from many radar reflectors representing a semi-infinite continuum of closely spaced targets. The DRLMS also allows the insertion/injection of the effects of Doppler shift and jamming into the synthesized modulated signal.

Abstract: A down range returns simulator for generating simulated radar reflected returns for testing advanced radar waveforms and associated signal processing. The simulator generates return signals based from real mission data, data transforms, arbitrary reference waveform convolutions, and radio and intermediate frequencies. The simulator includes a source of field data, synthetic target, an analog to digital converter for generating digital waveform returns, and RF/IF waveform generator, and a source of clutter waveform characteristics (OPINE, weather, and electronic counter-measures effects). The RF/IF waveform generator uses FFTs and IFFTs in order to develop realistic digital samples for evaluation software and Doppler images. The simulator apparatus provides a target return simulation as if received by radar in a down range mission flight test without the costly expense of conducting a mission flight test for collecting the appropriate data signatures for evaluation.

Abstract: A moving target simulator for testing a radar system has a radio frequency receiver, a digital radio frequency memory in electrical communication with the radio frequency receiver for storing a signal received thereby, a digital delay circuit in electrical communication with the digital radio frequency memory for providing a time delay between reception and transmission of the radio frequency signal, an amplitude modulation circuit in electrical communication with the digital radio frequency memory for modulating an amplitude of the radio frequency signal, a Doppler modulation circuit in electrical communication with the digital radio frequency memory for providing a Doppler-modulated signal, and a radio frequency transmitter for transmitting the radio frequency signal after it has been delayed, amplitude-modulated, and/or Doppler-modulated.

Abstract: A self-contained, single-unit test and calibration unit for Doppler-effect speed measurement devices (radar guns, etc.) is provided. The inventive unit is capable of performing manual, semi-automatic and automatic measurements on radar guns insuring no "missed" steps in the certification process. The unit is optionally supported by a general-purpose, digital computer such as a "PC" which may, in turn, be linked to a remote facility via modem or similar communication strategy. Either a local or a remote computer may oversee the test, calibration and certification processes. The inventive unit allows for fast and accurate certification of radar guns in the field by operators of only minimal technical skill thereby saving expense and time as radar guns no longer must be shipped to a remote certification facility.