Class / Patent application number | Description | Number of patent applications / Date published |
342189000 | For correlation | 24 |
20080211712 | DETECTING AND RECOGNIZING LONG DURATION WAVEFORMS - A method and apparatus for processing signal pulses received by a device to identify the presence or absence of a waveform is provided. The waveform may have a long duration and may have a sparse energy distribution. An example of such a waveform is the bin-5 radar waveform. Based on the arrival rate of pulses, filtering of pulses is performed. The pulses that are not filtered out are grouped into bursts and information about the bursts is stored in a burst history. For example, the burst history might store the number of pulses in the burst and an inter-burst interval time. Entries over a certain age may be deleted from the burst history. The burst history is analyzed to determine if the pulses conform to a pattern associated with the waveform. The analysis may be based on various statistics. In an embodiment, only time domain information is analyzed. | 09-04-2008 |
20080258964 | Radar System - In a radar system, a switcher is provided for switching over between at least two different directional characteristics, in particular for different distance ranges, of at least two transmitting antennas. On the receiving side, a combined evaluation of the digitized signals of at least two receiving antennas is performed, in the manner of a correlation of the receiving antenna signals. | 10-23-2008 |
20090085797 | Configurable radar sensor - Multiple signal characteristics representing an entire field of view of an FMCW (FM-CW) sensor are evaluated to determine whether the field of view has changed. Signal characteristics representing the field can be compared to representative signal characteristics obtained from previous scans. At least one signal characteristic representing at least a portion of the scene can be evaluated by comparing the signal characteristic to a dynamic threshold. The dynamic threshold can be redefined after each scan from the statistics of the signal characteristic. The dead zone of a sensor can be reduced by filtering out noise that would otherwise overshadow a signal representing the near-field region of a scene. The noise can be filtered by subtracting a polynomial curve from a time-domain signal representing the scene after fitting the polynomial curve to a representative signal generated based on previous scene scans. | 04-02-2009 |
20090121924 | CORRELATION CALCULATION CONTROL CIRCUIT AND CORRELATION CALCULATION CONTROL METHOD - A coherent integration section synthesizes an IF signal stored in a memory and a C/A code replica generated by a code generation section using a mixer to calculate a correlation value, and integrates the correlation value using an integration section. An integration count monitoring section counts the integration count of the integration section. When a saturation control section has detected saturation of integration of the correlation values, the integration count monitoring section causes the integration section to suspend integration when the integration count is equal to or less than a reference count, and allows the integration section to continue integration when the integration count has exceeded the reference count. | 05-14-2009 |
20090128400 | Stepped frequency radar device - A radar device ( | 05-21-2009 |
20090160699 | Time synchronization - A transmitter ( | 06-25-2009 |
20090289836 | HARDWARE COMPENSATING PULSE COMPRESSION FILTER SYSTEM AND METHOD - A method to improve a system's signal performance may comprise: generating a first signal, transmitting the first signal, receiving the first signal, and generating a second signal. The method may further comprise: identifying signal distortions generated by at least one of, a transmitter hardware that transmits the first signal and a receiver hardware that receives the first signal, modifying the second signal based upon the identified signal distortions, correlating the first signal and the second signal by a correlator to generate a correlated signal, and outputting the correlated signal. | 11-26-2009 |
20090309784 | Target object detection apparatus for acquiring information concerning target objects based on correlation matrix derived from signal values corresponding to reflected electromagnetic waves - A target object detection apparatus periodically executes a transmit/receive operation to transmit radar waves and obtain received signals from resultant incident reflected waves from respective target objects. An individual correlation matrix of received signal values is derived for each one of a fixed plurality of successive transmit/receive operations, with the transmission frequency being changed at successive operations. Individual correlation matrices derived from respective transmit/receive operations are time-averaged to obtain an average correlation matrix for use in obtaining target object information such as direction or velocity, with effects of correlation between respective incident waves being suppressed. | 12-17-2009 |
20100026562 | Detecting device and railroad vehicle - Location information of a vehicle such as a railroad vehicle and an elevator cage is detected by using a reflection strength change of an electromagnetic wave. A system is configured by a radiowave transmitter which emits a first radiowave, positional markers which generate unique reflection strengths and patterns of temporal changes in the reflection strength from the emitted first radiowave at respective absolute positions, a radiowave receiver which receives a second radiowave reflected by the positional marker and converts the second radiowave into a signal format for extracting location information to output the same, and a marker recognition device which obtains a location of the vehicle from the output of the radiowave receiver. Accordingly, a highly-precise location specification with a resolution smaller than or equal to 1 cm and a highly-reliable location specification which is not affected by slip and slide of wheels can be realized. | 02-04-2010 |
20100245159 | DISMOUNT STEP DISCRIMINATION WITH TEMPORAL ADAPTIVE MATCHED FILTERING OF DOPPLER SPECTRAL FEATURES - A process for detecting and discriminating a particular target, such as an ambulating human, amidst an environment crowded with other objects or humans having similar doppler profiles to the desired target. A method according to one embodiment includes generating an initial radar image corresponding to a received doppler profile of a target, and generating a matched filter signal corresponding to the received doppler profile. The matched filter signal is correlated with subsequently received radar images to detect and discriminate the target. | 09-30-2010 |
20110285579 | Tracking identities of persons using micro-impulse radar - One or more human attributes extracted from a micro-impulse radar (MIR) signal is correlated to a temporary identity or phenotypic identity of a person. | 11-24-2011 |
20120032837 | Network analyzer with an n-port network having at least two ports for measuring the wave parameters of a measurement object - A network analyzer includes an n-port network with two ports for measuring wave parameters of a measurement object. Each port has a feed for a radio-frequency signal from a signal source. Signal components of the radio-frequency signal fed into the respective port are reflected at the measurement object and the signal components of one or more radio-frequency signals fed into at least one other port are transmitted through the measurement object to the respective port are measured as wave parameters. The two ports are supplied with different radio-frequency signals, wherein frequencies or frequency bands are offset with respect to one another by a frequency offset. Reflected and transmitted signal components of the radio-frequency signals are measured at the same time at the two ports. | 02-09-2012 |
20120056779 | Method and Apparatus for Determination of a Doppler Frequency Shift Resulting from the Doppler Effect - A method and apparatus for determination of a Doppler frequency shift | 03-08-2012 |
20120127027 | Persymmetric Parametric Adaptive Matched Filters for Detecting Targets Using Space-Time Adaptive Processing of Radar Signals - A method provides space-time adaptive processing (STAP) for target detection using adaptive matched filters (AMF). A generalized likelihood ratio test (GLRT) is determined where spatial and temporal correlation matrices Q and A are assumed. Then, the correlation matrices A and Q are replaced with maximum likelihood (ML) estimates obtained only from training signals subject to a persymmetric constraint. | 05-24-2012 |
20120146844 | ACTIVE RADAR SYSTEM AND METHOD - The present invention relates to an active radar system and a corresponding method. The proposed system comprises at least two transmit antennas that each transmits radiation to a scene as a transmit signal, said transmit signal comprising a series of frequency modulated pulses, at least one receive antenna that receives radiation from said scene as a receive signal, a controller that controls said at least two transmit antennas. The transmissions of the transmit signals are subsequently initiated with time offsets, controlled to be larger than the time delay between transmission of a first transmit signal of said two transmit signals and reception of radiation of said first transmit signal by said at least one receive antenna and to be smaller than the time duration of a complete frequency modulated pulse of said first transmit signal. | 06-14-2012 |
20120218139 | CORRELATION FILTER FOR TARGET SUPPRESSION, WEIGHT CALCULATION METHOD, WEIGHT CALCULATION DEVICE, ADAPTIVE ARRAY ANTENNA, AND RADAR DEVICE - In an adaptive array antenna, an array antenna receives a signal containing a reflected target signal of a radar pulse, a correlation filter circuit suppresses a component correlating with a target signal in the received signal by applying a correlation filter to the received signal, a weight calculation circuit calculates an adaptive weight from data processed with application of the correlation filter, and a beam synthesizing circuit creates output data by performing weight control on the received signal by using the adaptive weight. | 08-30-2012 |
20120235859 | RADAR APPARATUS - Provided is a radar apparatus that can detect the failure of the transmission switch. The radar apparatus includes: a plurality of transmission antennas; transmission switches that select a transmission antenna for transmitting an electromagnetic wave from among the plurality of transmission antennas; a plurality of reception antennas that receive a reflected wave which is the electromagnetic wave reflected from a target as a reception signal; a signal processing unit that detects the target based on a sampling signal obtained by sampling the reception signal; and a failure judgment unit that compares first reception signals transmitted from one of the plurality of transmission antennas and received by the plurality of reception antennas, with second reception signals transmitted from another of the plurality of transmission antennas and received by the plurality of reception antennas, and judges whether or not any one of the transmission switches has failed based on a comparison result. | 09-20-2012 |
20120256787 | RADAR RECEPTION SIGNAL PROCESSING APPARATUS AND METHOD THEREOF - According to one embodiment, a calculating of a weight includes which is calculating a covariance matrix by applying a process (Post-Doppler process) of selecting a plurality of banks after execution of a Doppler filter process to a specified number of pulses of the received signal, and extracting a plurality of arbitrary bank parts from among the plurality of selected banks which are used for the calculation of the covariance matrix, and calculating a plurality of weights on a phase and an amplitude, from a matrix of the plurality of extracted bank parts. | 10-11-2012 |
20120306687 | HIGH SPEED HIGH RESOLUTION WIDE RANGE LOW POWER ANALOG CORRELATOR AND RADAR SENSOR - A high speed high dynamic range and low power consumption analog correlator for use in a radar sensor. The analog correlator combines various pulse replication schemes with various parallel integrator architectures to improve the detection speed, dynamic range, and power consumption of conventional radar sensors. The analog correlator includes a replica generator, a multiplier, and an integrator module. The replica generator generates a template signal having a plurality of replicated pulse compression radar (PCR) pulses. The multiplier multiplies a received PCR signal with the plurality of replicated PCR pulses. The integrator module is coupled to the multiplier and configured to generate a plurality of analog correlation signals, each of which is based on the multiplying between the received PCR signal and one of the replicated PCR pulses. | 12-06-2012 |
20130099959 | HIGH SPEED HIGH RESOLUTION WIDE RANGE LOW POWER ANALOG CORRELATOR AND RADAR SENSOR - Systems, methods and apparatus related to a high speed, high dynamic range and low power consumption radar system are provided herein. The radar system may include an analog correlator which combines various pulse replication schemes with various parallel integrator architectures to improve the detection speed, dynamic range, and power consumption of conventional radar sensors. The radar system may further include a matched filter for determining a match of a portion of a received PCR signal and producing an output signal in response to further improve the speed of detection of the radar system. | 04-25-2013 |
20130113653 | RADAR DEVICE - The disclosed technique includes transmitting a signal intermittently according to a transmission cycle having a predetermined transmission period and a non-transmission period; receiving the signal reflected from a target with reception antennas; and detecting the target from the reflected signal. A high-frequency transmission signal attenuated during the transmission period and a receipt signal received during the non-transmission period are combined together. A correlation value between a reference transmission signal and the receipt signal in the combined signal is calculated, and the amount of phase shift in an arbitrarily selected reception antenna is calculated from the correlation value of a reference reception antenna, and the correlation values of the other reception antennas. The phase component of the correlation value of the arbitrarily selected reception antenna is corrected on the basis of the amount of phase shift. | 05-09-2013 |
20130135140 | RADAR DEVICE - A high-frequency transmission signal is transmitted from a transmission antenna with a predetermined transmission period, and a signal of a reflected wave reflected from a target is received by a reception antenna. A code generator generates a first code sequence and second code sequence that constitute a pair of complementary codes. A first modulator modulates the first code sequence to generate a first transmission signal. A second modulator modulates the second code sequence to generate a second transmission signal. A quadrature modulator performs quadrature modulation by using the generated first and second transmission signals. The high-frequency transmission signal is generated from a signal that is quadrature modulated, and transmitted from the transmission antenna. | 05-30-2013 |
20140091964 | METHOD OF RADAR SURVEILLANCE AND OF RADAR SIGNAL ACQUISITION - A radar includes an antennal structure, with means for transmitting an impulse signal in a band centered on F1 according to a repetition period centered on a recurrence period Tr1 and pulse width T1, with means for receiving signals by the antenna in frequency band ΔF, with a unit for processing the signals received on a set of N distance bins. The signals received are transmitted by another radar in a frequency band centered on F2 where F2−F1≦ΔF, according to a repetition period centered on a period Tr2 and pulse width T2. The signals transmitted by the two radars are asynchronous. The method comprises: slaving frequency F1 to frequency F2, by measuring the power received integrated over the N distance bins and over several recurrences, determination of period Tr2 and T2 and slaving the period centered on Tr1 to a period centered on Tr2 with Tr1=k*Tr2. | 04-03-2014 |
20160011308 | RADAR AND OBJECT DETECTION METHOD | 01-14-2016 |