Abstract: Method of reflecting electromagnetic energy and jamming radar by imposing a olution of an organic electrolyte with a dielectric constant of at least 90 at 25.degree. C. in the path of the electromagnetic energy.

Abstract: A relatively narrow beamwidth (10.degree. or less) receiving antenna patt is formed at the receiver end of a radio frequency transmission link where a plurality of radiating sources are operating in a dense communications environment. The antenna pattern comprises the difference between two antenna receiving patterns where the beamwidth of one pattern is wider by a predetermined angular amount than the other pattern. In the preferred embodiment, a phased linear array of antenna elements is operated as two sets of elements wherein one set of elements comprising a number of elements less than the total number of elements provides a beamwidth that is broadened by a predetermined angular sector greater than the beamwidth formed by the entire array. The antenna elements are progressively phase shifted to provide overlapping beam patterns and the pattern of one set of elements is scanned so that one side of both patterns are substantially coincident.

Abstract: A rotor tip synthetic aperture radar is described including a rotor operable to rotate, a radar receiver positioned in the rotor and for relaying received signals to a second position such as the cab of a helicopter. A radar transmitter and receiver located within the second location for transmitting radar signals towards a target and for receiving target reflected signals relayed from the rotor tip. The doppler frequency shift imposed on the relayed target reflected signals is cancelled by generating a pilot signal at a predetermined frequency and transmitting the pilot signal to the rotor tip which has a receiver for receiving the pilot signal and for relaying the pilot signal back to the second location and frequency multipliers and mixers for generating a first order doppler frequency shift signal appropriately scaled to cancel the doppler frequency shift signal of the target reflected signals when the two are subtracted in a mixer.

Abstract: A Doppler radar system for mounting on a vehicle to sense the speed of movement of the vehicle and to provide an output proportional to the speed of the vehicle. The output is substantially free from errors due to the vibration and of the vehicle. A Janus configuration is also provided which also eliminates errors due to the angle of tilt of the vehicle.

Abstract: A radar, e.g. as used for the surveillance of aerial navigation, has a receiver feeding incomimg echo signals to several Doppler filters in parallel, the output signal of each filter beign passed to a utilization stage through a respective attenuator connected to the filter output in parallel with an associated area processor. The latter comprises a pulse counter synchronized with the scanning motion of the radar antenna to register the number of echoes received in successive sweeps from different zones into which the surveyed space is divided in distance and azimuth. Upon the last sweep of a sector encompassing a group of such zones, the contents of respective cells of a sector memory loaded by the pulse counter are compared with a first threshold. If the number of echoes stored in such a cell exceeds that threshold, a count written in an assigned cell of a scan memory is incremented; if it does not, the count is decremented.

Abstract: A remote radar detector head has a front control unit portion and a rear mounting surface portion which is thinner than the front head portion. The mounting surface portion extends rearwardly of the front head portion and extends downwardly or upwardly at an angle relative to the front head portion depending upon whether the detector head is in a first or inverted second mounting position. At a front panel of the front head portion, first and second escutcheons are provided with indicia inscribed thereon. In the first mounting position the first escutcheon is utilized while in the second or inverse mounting position the second escutcheon is employed with the indicia in reverse location thereon. The radar detector control unit can be conveniently mounted in a variety of locations within an automobile to insure ease of monitoring and control by the driver of the automobile who desires to sense incoming radar pulses.

Abstract: In order that it should respond satisfactorily to substantially all moving targets within range (without exhibiting "blind speeds") and ignore all stationary targets, a moving target indication system comprises an FM continuous wave radar system in the form of an oscillator (1) the output frequency of which is swept by the output signal of a triangular-wave generator (19). The oscillator output signal is fed to an aerial (3) via a circulator (4) and also to a first input (6) of a mixer (7) a second input (8) of which is supplied with the return signal from the aerial. The respective output waveforms of the mixer occurring for sweeps of the oscillator frequency in the two directions are, in a further circuit (11), subtracted one from the other after effectively time-reversing one of them, and the resulting difference waveform is analyzed in a Fast Fourier Transform calculating circuit (15).

Abstract: A tracking, variable Q bandpass filtering method and apparatus are provided for processing an IF signal from a radar transceiver or the like. The method comprises developing a digital period signal corresponding to the period of each of selected cycles of the IF signal; subjecting the digital period signal to low pass filtering; and controlling the effective corner frequency of the low pass filtering in accordance with the amount of variation in the digital period signal from one selected cycle to a successive selected cycle for producing a filtered signal which substantially follows the digital period signal, thereby substantially simultaneously tracking and filtering the IF signal. The apparatus comprises apparatus for carrying out the foregoing method. Preferably, the apparatus also includes an output switching control for selectively delivering or withholding the filtered signal from an output utilization device.

Abstract: The invention is a programmable frequency controller for a frequency agile adar system. The system comprises a microprocessor which includes clock generator, a front panel radar parameter input unit, a program memory, data memory, a front panel radar an input buffer port, a microprocessor data bus, an output buffer port, a front panel display unit, a radar data collection system, a radar synthesizer output buffer unit, a radar frequency synthesizer, and a frequency agile radar system with antenna. The control system operates, monitors, and collects operational data during operation of the frequency agile radar system. Input control parameters are preset at the front panel radar parameter input unit. Program memory contains preprogrammed computer control instructions for the microprocessor in performing control and management of operational data during radar operation. The data memory unit provides capability of storing and transferring data during operation of the system.

Abstract: A radar warning receiver is provided having an alarm indicator responsive to an electronic switch, the switch being activated and energizing the alarm in response to an alarm signal indicating the presence of a police radar signal, the switch being deactivated and de-energizing the alarm in response to a mute signal occurring during the occurrence of the alarm signal, the switch remaining deactivated until the alarm condition signal terminates and subsequently reoccurs.

Abstract: A converter, according to the present invention, operates to convert pertnt IFF data which is in a digital format to an IFF composite video format. The converter is configured to interface with conventional plan-position indicators (PPIs) and decoders.

Abstract: A dipole arrangement which is located in a sheath,including segments of ejectable dipoles sequentially arranged within the sheath. The dipole can be ejected from the sheath within a short time interval and, subsequent to ejection, will rapidly form a large-surfaced and homogeneous cloud. The segments of the sheath which has a polished inner surface, as viewed in the ejecting direction, evidence an envelopment with a reducing number of windings which consists of a thin metal foil, smooth on both sides thereof, and wherein the dipoles of the enveloped segments, or the only partially enveloped segments, are centripetally pretensioned. The dipoles which are prestressed in the segments act as drive springs for the metal foil which encompass the segment whereby, dependent upon the winding number of the metal foil, there is achieved a time-delayed release of the dipoles.

Abstract: A 360.degree. IFF video resynchronizer unit for storing pertinent data such s the range, the code, the IFF mode and the azimuth for each reply from associated transponders is disclosed. The 360.degree. IFF video resynchronizer unit is also configured for interfacing with one of a plurality of interrogator subsystems associated with a plurality of radar systems having multiple antennas so as to backup any one of the plurality of interrogator subsystems with a single 360.degree. IFF video resynchronizer unit. In addition, any number of the plurality of interrogator subsystems can be replaced with a single 360.degree. IFF video resynchronizer unit when at least one of the plurality of interrogator subsystems is present.

Abstract: A system for simultaneously locating a plurality of targets and distinguishing the targets from noise which utilizes phase detector techniques to generate complex voltage signals and obtain phase information. Spectral analysis is performed on the complex voltage temporal functions to generate doppler frequency functions. Both spectral phase functions and spectral amplitude functions are generated from the doppler frequency functions. Spectral phase functions are analyzed using interferometry techniques to determine if a potential target has a common locational source from returns of a plurality of sensors. A zenith angle is also generated using interferometry techniques to provide locational information of the multiple targets. Range gating and two frequency range detection methods provide high resolution range information as to the location of the targets. High resolution range information and two dimensional zenith angle information are used to provide an image of the targets.

Abstract: A guided missile having a radar system which is utilized as a target seeker and tracking radar as long as it is capable of tracking the target through the encounter, after which, or at some set distance from the target, the radar and associated circuitry provides the optimum burst time.

Abstract: An inter-vehicle distance control system for a vehicle wherein the distance between the vehicle and a preceding object and a relative velocity therebetween are detected by a detection system such as a radar system, and when this distance has become shorter than a predetermined value, a reaction force is imparted to a throttling operation member such as a throttling pedal. The vehicle operator is effectively advised of this fact.

Abstract: A navigation system including at least one pulse radar and a number of transponders which when receiving radar pulses transmit high frequency pulse modulated signals. When receiving an interrogating signal from the pulse radar the transponder transmits a response signal with a delay. The delay is selected in such a manner that the response signal arrives at the pulse radar within a time space lying between the moment when all signal echos, lying within a definite range, have been received and the moment when the next radar pulse begins. The display scan in the radar is delayed by the same value as the response signal. In this way the response signal competes with considerably weaker echo signals than in the case of a non delayed response.

Abstract: A radar apparatus which includes a transmitter that generates a train of pulses arranged in groups of two, each group including a long pulse and a short pulse of different frequencies. These long and short pulses are separated in a receiver by a range gate which passes the pulses through the upper receiving channel when reflected from long ranges and the lower receiving channel when received from short ranges. The upper channel includes a filter which passes only the long pulses, which are frequency swept, and then compressed. The lower channel includes a filter which passes only the short pulses which are not frequency swept. The transmitter reverses the order of the pulses in adjacent groups. Alternatively, both the long and short pulses may be frequency swept. In either event there are adjacent pairs of swept pulses in contrast to known systems in which each swept pulse has immediately been preceded or followed by an unswept pulse.

Abstract: A pulse compression signal processor suitable for use in a phase-coded, pulse compression radar for decoding the phase coded radar return pulses to enhance the resolvability of objects in range is disclosed. The pulse compression signal processor includes a conventional correlation processor operative in accordance with an initial filter function to convert a signal representative of the phase-code of the transmittal RF pulse to effect the range correlation response thereof. The resulting range correlation response is modified in accordance with a desired range correlation response. Both the phase code representative signal and the desired range correlation response signal are converted by fast Fourier transformations into their corresponding frequency domain signals which are divided to effect a desired filter function signal for use in decoding the phase-coded radar return pulses to effect substantially the desired range correlation response thereof.

Abstract: A radar correcting system has features for providing a corrected radar receiver reflection to a Doppler process unit. The corrected receiver pulse accounts for variances in phase, amplitude and frequency of the transmit pulses. The system has a phase detector that detects the phase difference between a stable oscillator and the transmit signal, providing a complex video or real and imaginary outputs. An operator that will normalize the transmit pulse is determined. The operator is applied to the reflections received by the receiver antenna to remove from the reflections any vagaries due to varieties in the transmit pulses. The data proceeding to the processor deals only with the objects causing the radar reflection.