41 results about "Fire-control radar" patented technology

A method for reconditioning Fire Control Radar APG-68 tactical radar systems (FCR) utilized in military aircraft and returning them to operation with extended useful life expectancies equivalent to or better than new of the FCR APG-68 unit high frequency, high voltage dual mode radar transmitters that are deployed in over 1000 state-of-the-art military aircraft such as the F-15, F-16 and F-18 fighter aircraft, and B-1 bombers. The novel method extends the mean lifetime of previously repaired and repairable FCR APG-68 tactical radar units and radar units and ageing transmitters from about 100 to a few hundred hours to about five hundred or more hours by the step of removing embedded moisture and absorbed moisture from the heterogeneous electronic components in the FCR APG-68 tactical radar unit.

An electronic warfare (EW) cross-eye system comprises two antennas separated a distance, d, a part, where d is much greater than the wavelength, λ, of a tracking signal emitted by a fire control radar (i.e., d >>λ). The EW cross-eye system further comprises a receive polarimeter for measuring the tracking signal and a second polarimeter for synthesizing the measured tracking signal to produce, for transmission, a jamming signal comprising a pair of inverted amplitude signals that are 180 degrees out of phase with each other.

An interference condition-based dual polarization monopulse radar object angle estimating method is disclosed and relates to the technical field of radar electronic countermeasures. A radar receiving antenna is transformed into a double polarization reception antenna, corresponding sum-difference networks and receiving channels are added, and a dual polarization monopulse radar device is formed; according to three channel sum, azimuth difference and pitching difference output data of horizontal polarization of the radar device as well as three channel sum, azimuth difference and pitching difference output data of vertical polarization, polarization characteristics of compound jamming can be estimated, a polarization ratio of interference can be substituted into a mathematical formula which then can be solved, errors of coupling between the interference signals and an object angle can be eliminated, and a real object angle can be estimated; the invention provides a simple and effective main lobe compound jamming resisting method which is easy to implement in the engineering field; the method disclosed in the invention can be applied to conventional object indication radar devices, tracking and guiding radar devices, terminal guiding radar devices and fire control radar devices and is of great practical significance.

An interference condition-based monopulse radar object and interference source angle measuring method is disclosed and relates to the technical field of radar electronic countermeasures. A radar receiving antenna is transformed into a double polarization reception antenna, corresponding sum-difference networks and receiving channels are added, and a dual polarization monopulse radar device is formed; according to horizontal polarization sum, azimuth difference and pitching difference three channel output data of the radar device as well as vertical polarization sum, azimuth difference and pitching difference three channel output data, polarization characteristics of compound jamming can be estimated, polarization ratios of an object and interference can be substituted into a mathematical formula which then can be solved, errors of coupling between the interference signals and an object angle can be eliminated, and a real object angle can be estimated while a real angle of an interference source can be estimated; the invention provides a simple and effective main lobe compound jamming resisting method which is easy to implement in the engineering field; the method disclosed in the invention can be applied to conventional object indication radar devices, tracking and guiding radar devices, terminal guiding radar devices and fire control radar devices and is of great practical significance.

A radar jamming signal generated by equipment carried by a target aircraft, is launched onto the leading end of a towed single wire transmission line so as to travel the length of the line as a nonradiating surface wave. A drogue radiator is attached to the trailing end of the line for radiating the jamming signal transversely of the towed line so as to be received by and cause jamming of tracking and/or fire control radar. The length of the single wire transmission line is selected so that the trailing radiator causes the jamming signal to emanate from a position sufficiently behind the aircraft so as to be outside the destructive radius of weapon fire directed at the apparent source of the jamming signal by fire control radar. A ventriloqual-like deception of the radar is thus achieved. A wave launcher couples the jamming signal to the leading end of the transmission line and for this purpose includes an electrically conducted horn-shaped structure, a tunable coaxial feed end at the constricted end of the horn structure, an inner transition conductor connecting the inner conductor of the coaxial feed to a leading end of the single wire transmission line, and a plurality of annular dielectric lenses and dielectric guides cooperatively shaped and fitted to the horn structure in a manner that effectively matches the bounded electromagnetic transmission wave characteristics of the coaxial feed cable with the surface wave transmission characteristics of the single wire transmission line.

The invention provides an airborne fire-control radar online fault diagnosis system which is characterized in that the system comprises a radar fault information record module and a handheld online diagnosis system, the radar fault information record module is mounted on an airborne radar, radar fault information generated in daily working process of the airborne radar and log information of system operations are transmitted to the radar fault information record module by the airborne radar and stored by the radar fault information record module, the handheld online diagnosis system comprises a main control module, a power control module and a display screen, the power control module supplies power for the main control module and the display screen and can supply power for the radar fault information record module in the airborne radar through an external cable, a radar fault information dictionary is stored in the main control module, the main control module receives radar fault information transmitted by the radar fault information record module in the airborne radar through an Ethernet port, the radar fault information is converted into display output signals by querying the radar fault information dictionary, and the display output signals is transmitted to the display screen and displayed by the display screen.

A decoy jamming detection method based on four-channel monopulse ratio statistical properties relates to a decoy jamming detection method. A monopulse radar receiver is improved; four-channel echo signals are extracted; a single pulse ratio is calculated according to output signals of the four channels; a jamming detection threshold is determined according to an experimental value; whether the single pulse ratio exceeds the threshold is judged; and if the single pulse ratio exceeds the threshold, decoy jamming detection is completed. The invention can be applied to existing target indicator radars, tracking guidance radars, terminal guidance radars and the fire control radars. Jamming can be rapidly detected and corresponding anti-jamming measures can be started once a double-difference signal is drawn forth, thus having an important practical significance.

A method for improving the manufacture and reliability of new, remanufactured, repaired or reconditioned Fire Control Radar APG-68 tactical radar systems (FCR) utilized in military aircraft and providing such units with extended useful life expectancies equivalent to or better than new of the FCR APG-68 unit high frequency, high voltage dual mode radar transmitters that are deployed in over 1000 state-of-the-art military aircraft such as the F-15, F-16 and F-18 fighter aircraft, and B-1 bombers. The novel method extends the mean lifetime of previously repaired and repairable FCR APG-68 tactical radar units and radar units and ageing transmitters from about 100 to a few hundred hours to about five hundred or more hours by the process of removing embedded moisture and absorbed moisture from the heterogeneous electronic components and preferably also removing contaminants from the heat transfer surfaces of the cold plates and heat exchangers in the FCR APG-68 tactical radar unit.

A method for improving the manufacture and reliability of new, remanufactured, repaired or reconditioned Fire Control Radar APG-68 tactical radar systems (FCR) utilized in military aircraft and providing such units with extended useful life expectancies equivalent to or better than new of the FCR APG-68 unit high frequency, high voltage dual mode radar transmitters that are deployed in over 1000 state-of-the-art military aircraft such as the F-15, F-16 and F-18 fighter aircraft, and B-1 bombers. The novel method extends the mean lifetime of previously repaired and repairable FCR APG-68 tactical radar units and radar units and ageing transmitters from about 100 to a few hundred hours to about five hundred or more hours by the step of removing embedded moisture and absorbed moisture from the heterogeneous electronic components in the FCR APG-68 tactical radar unit.

The invention provides an M/lj//i/ bus control and information recording method and system, and relates to the technical field of bus control and data processing. The system mainly comprises a host computer and a lower computer, wherein the host computer is a PC with USB interfaces and is installed with corresponding host computer software for receiving data displaying and storage and sending control instructions to the lower computer, and the lower computer has a 220V/50Hz power conversion module, an M/lj//i/ (QBus) bus adaptor module, a signal transmit-receive unit and a data buffer memory unit. Equipment is mounted on the M/lj//i/ (QBus) bus through the bus adaptor module. Data reaches the signal transmit-receive unit through the bus adaptor module, is converted into digital signals, and sent to the host computer for display and storage after being converted through USB protocol via the data buffer memory unit. Control instructions are sent to the bus through a reverse process. The system is convenient for operation, and is widely used for fire control radar data analysis and test debugging. The system provides detailed analysis data for radar fault-finding.

The invention discloses a method improving radar active beacon machine precision; the method comprises the following steps: using a logarithm detection mode to process and receive an inquiry signal; shaping the signal and outputting a pulse signal to serve as a reference signal for a DRFM; reducing radar emitting and receiving power changes caused by the temperature and weather change factors, thus obviously improving alignment calibration precision. The method uses the logarithm demodulation mode to process and receive the inquiry signal, can effectively reduce radar emitting and receiving power changes caused by the temperature and weather change factors, and can prevent shaking phenomenon of pulse front edge after demodulation, thus obviously improving alignment calibration precision, and a distance precision can reach precision requirements needed by a fire control radar for alignment calibration.

The invention belongs to the field of airborne fire control radars, and particularly relates to a method for suppressing a false target caused by blades of a large wind turbine generator. The method comprises the steps of: processing echoes of an airborne radar to obtain a spectrogram; calculating a frequency coverage of fan blade rotation echoes according to radar echo information; making radar echo intensity statistics within the frequency coverage of the fan blade rotation echoes on each distance dimension of the spectrogram; determining whether the radar is subjected to clutter interference of the rotating blades of the wind turbine generator according to radar echo intensity statistic parameters; and performing box-type filtering of the frequency dimension within the frequency coverage of the fan blade rotation echoes on the spectrogram if so. The method can effectively suppress the false target caused by the blades of the large wind turbine generator, and can protect real target echoes while suppressing the false target.

The invention discloses an airborne radar signal interception probability modeling method based on air intelligence track sharing, which is used for solving the technical problem of poor practicability of the existing airborne fire control radar control method. The technical scheme is that the number n of times the intercepted receiver is irradiated in the range of radar beam scanning is calculated first. Secondly, the probability of the intercepted receiver and the radar beam meeting in time domain is calculated when the radar is illuminated. Then, the probability Pr (m, n, P) of m successfulinterceptions in time and space domain is calculated when the probability of the intercepted receivers being irradiated n times and the probability of the intercepted receivers meeting each other intime domain is P. Then the probability of the radar and the interceptor meeting successfully once in time and space is calculated. Then the detection probability Pd of the intercepted receiver to thebeam energy of the radar transmitter is calculated, the probability Pf of the intercepted receiver tuning to the radar frequency and the probability Pk of the intercepted radar signal being identifiedby the intercepted receiver are calculated, and the probability model of the intercepted radar signal is established. The invention adopts binomial distribution as a model of radar signal interception probability, and has good practicability.

The invention belongs to the field of onboard fire control radar, and particularly relates to a GMTI-based method for rapidly resolving a target speed. The GMTI-based method comprises the following steps of detecting target fuzzy frequencies to be respectively F1 and F2 and main clutter frequencies to be respectively F<Z1> and F<Z2>; respectively calculating Doppler frequency shift F1-F<Z1>+M1f1 and F2-F<Z2>+M2f2 of a target phase on main cluster; respectively calculating speeds of Vt1 and Vt2 of the target phase on the main cluster under conditions of low pulse repetition frequency waveformsPRF1 and PRF2; judging whether difference between the speeds Vt1 and Vt2 conforms to an ambiguity-resolving threshold value Vth; considering the speed Vt1 and Vt2 as target speeds if the difference conforms to the ambiguity-resolving threshold value Vth; and determining a fuzzy multiple number in the step 2 again if the difference does not conform to the ambiguity-resolving threshold value Vth, and repeating the step 3 to the step 4. According to the GMTI-based method for rapidly resolving the target speed, small-range traversing can be performed by taking a frequency where the main cluster islocated as an initial according to the speed distribution characteristic of a ground moving target during resolving the fuzzy multiple number, the speed information of the ground moving target can berapidly resolved, and the demand of software and hardware resource is small.

The invention provides a carrier-borne stealth multi-purpose fighter aircraft model specially used for a floating-island-type aircraft carrier. The carrier-borne stealth multi-purpose fighter aircraft model comprises a body, a detector, a cockpit, an engine, electronic warfare jamming bombs, air-to-ground guided missiles, air-to-air missiles, antiship missiles, empennage supports, empennages, an antisubmarine torpedo, an antisubmarine missile, a combined-type balance frame tail vane and a fire control radar. Through the stealth technology, the fighter aircraft can effectively avoid radar tracking, is convenient to attack, transfer and camouflage flexibly and is not easy to be found by enemies; the fighter aircraft is equipped with the electronic warfare jamming bombs, the air-to-air missiles, the antiship missiles, the antisubmarine torpedo and an anti-submarine missile strike device, so that striking range of the fighter aircraft is enlarged; the fighter aircraft can strike to the air, to the ground and to the sea, thereby greatly improving battlefield survival rate and sudden strike capability of the fighter aircraft; and meanwhile, serving as a teenager national defense education model, the stealth multi-purpose fighter aircraft model displays developmental level of modern aircraft carrier and fighter stealth technology, and plays an active promotion role in education of youth's ocean view and national defense awareness.