Abstract: The improved radiometric target seeking system incorporates automatic gain control features including phase tracking automatic gain and automatic gain scan amplitude controls in a system which is basically a dual-axis, gimballed, conical-scan radiometric sensor designed to operate in either active or passive modes and to provide angular line-of-sight rate steering signals to guidance control apparatus. Target-derived automatic gain control signals permit separation of desired stationary target signals from significant background clutter, and a unique adaptive processor minimizes degradation of tracking response and accuracy.

Abstract: A dual I.L.S. glide slope system for allowing a normal 3.degree. descent path plus an additional 6.degree. descent path which can be used for noise abatement procedures etc. In accordance with the present invention these glide slopes are provided on a single assigned R.F. channel with no inverted courses interposed. The first signal null will occur at 9.degree. elevation when all signals will be zero, producing a "flag" alarm.

Abstract: An arrangement including an integrating circuit connected to the detection circuit of a pulse compression radar. The output of the integrating circuit is connected to a display tube of the radar. The integrating circuit has a control input connected to a distance shifting circuit. The distance shifting circuit is controlled by a first distance coincidence circuit operated by a first distance designating circuit and allows the secondary alternating lobes of the main video-frequency echo signal to be integrated at predetermined times for a period equal to the length of the central peak of a secondary echo signal. A second distance coincidence circuit operated by a second distance designating circuit allows the integration to be locked on to the central peak of the secondary echo.

Abstract: The position of a receiver responsive to C/A signals derived from multiple, orbiting space crafts is determined to an accuracy of greater than 300 meters. Each of the C/A signals has the same carrier frequency and a different, predetermined Gold code sequence that normally prevents position determination to be more accurate than to within 300 meters. C/A signals transmitted to the receiver are separately detected by cross correlating received Gold code sequences with plural locally derived Gold code sequences. Four of the detected C/A signals are combined to compute receiver position to an accuracy of 300 meters. To determine receiver position to greater accuracy than 300 meters, the relative phase of internally derived Gold code sequences is varied over the interval of one chip of each sequence, to derive second cross correlation values indicative of received and locally derived Gold code sequences; the second cross correlation values represent different positions within the computed 300 meter position.

Abstract: 2. A doppler shift rate detector system comprising: a first mixer; input ns for simultaneously applying a carrier signal and a doppler shifted sideband signal to said first mixer; first and second intermediate frequency amplifiers coupled to said first mixer; a mixer and an intermediate frequency amplifier stage coupled to said first and second intermediate frequency amplifiers; a mixer and oscillator stage coupled to said mixer and intermediate frequency amplifier stage; a frequency multiplier coupled to said mixer and oscillator stage; a second mixer coupled to said frequency multiplier; a delay line having an input coupled to said frequency multiplier and an output coupled to said second mixer, a narrow-band active filter coupled to said second mixer; an indicating means coupled to said filter; a low frequency switch coupled to said filter; a R. F. switch coupled to said first and second intermediate amplifiers; a sweep generator coupled to said R. F.

Abstract: An improved method and apparatus for automatically monitoring objects, such as vehicles, for example, wherein signpost units are positioned at predetermined locations and each signpost unit transmits a binary signpost code for reception via units installed in the objects being monitored and the objects being monitored receive the signpost codes and store object location information. In one aspect, the present invention contemplates a method and an apparatus which has a multi-mode operation capability wherein the location of the monitored objects is reported when the monitored object enters a different coverage region in an automatic reporting mode, wherein only those monitored objects within a predetermined region or on a predetermined route report to the base station in a region or route reporting mode, and wherein only the locations of predetermined monitored objects are reported to the base station in a polling mode.

Abstract: A digital seismic telemetry system for recording seismic data from a plurality of seismic signal detectors positioned at selected detector stations. The system includes a plurality of remote units, each of which is positioned at a distinct detector station to receive seismic data from the detector at that station. The remote units each include a storage device for storing seismic data from the detector in digital form, and a remote transmitting unit for transmitting the stored seismic data from the storage device to a master recording unit for recording. A master control unit operably connected with each of the remote units controls the acquisition and the transmission of seismic data from the remote units to the master recording unit and limits the amount of data transmitted at any given time to optimize the bandwidth requirements for the data transmission.

Abstract: A circuit for generating a saw tooth waveform in a coil such as the deflection coil of a television picture tube, comprising a first circuit branch including a capacitor serving as an energy storing current source and a controllable rectifier, and a second circuit branch including another current source, a second controllable rectifier and a resonant circuit comprising two reactances, constituted by an inductance and a capacitor which are connected in circuit by the second controllable rectifier and act to draw current from the two sources away from the deflection coil when the second controllable rectifier is fired whereby to initiate the flyback portion of the saw tooth waveform.

Abstract: A vibration transducer has a cylinder for enclosing a viscous damping medium. A seismic mass in the form of a piston is mounted in the cylinder for axial oscillation with the aid of a spring suspension which is flexible in an axial direction and has its maximum stiffness at right angles to that axial direction to retain the piston against radial movement relative to the cylinder. A mounting post extends through a bore in the piston and the spring suspension includes a bridge extending from one side to the opposite side of the piston. The axial oscillation of the piston is damped with the aid of floating seals between the piston and cylinder, between the piston and the mounting post and between the piston and the spring suspension bridge. These floating seals impede the flow of the viscous damping medium past the piston while at the same time avoiding static friction between the moving parts and the piston of the vibration transducer.

Abstract: An electron multiplier includes a plurality of staggered parallel dynodes. The dynodes include spaced confinement bumps along their lengths with active multiplying areas between the bumps. The confinement bumps and active areas therebetween define a plurality of channels which extend from a cathode at one end of the multiplier to the output end. Each channel traverses the staggered parallel dynodes and causes an electron beam to pass therethrough without substantial spreading. The electron multiplier includes additional structure for creating a high gain condition in the channels which are desired to be in an "on" condition while simultaneously creating a low gain condition in the adjacent channels. Electrical potentials can be simply switched at the dynodes so as to change this first condition into a second condition where the relative gain parameters of the channels are reversed.

Abstract: An improved delayed sweep system is disclosed for an oscilloscope having main and delayed sweeps. A trigger pickoff circuit has means for providing a pair of pre-selected trigger pickoff points on the delaying sweep so that delayed sweeps may be generated in accordance with the two points selected. An alternating display mode facilitates presentation of the delaying sweep and both delayed sweeps in a single display, with the relative time positions of both delayed sweeps appearing on the delaying sweep as a pair of intensified zones. Either delay time measurement between the sweep start and a point of interest on the display, or differential time measurement between two points of interest on the display may be made. Voltages proportional to the selected time measurement may be applied to a properly scaled digital voltmeter to provide a direct readout in units of time.

Abstract: A pulse repetition frequency (PRF) detection system is provided for indicating the existence of pulse trains having predetermined repetition frequencies in a composite signal containing pulse trains of different pulse repetition frequencies. The system includes a plurality of independent sorters to which the composite signal is sequentially applied. Each of the sorters is operable to detect a pulse train having a predetermined pulse repetition frequency, to indicate the detection, and to produce pulses for inhibiting or blocking the application of the corresponding pulses of the composite signal on a pulse-by-pulse basis. The sorters may be arranged and interconnected in a decreasing order of frequency detection whereby the signal applied to each successive sorter has all higher frequency detected pulse trains removed therefrom.

Abstract: An oscilloscope has an additional vertical display mode to enable the display of the trigger signal, activating the sweep generating circuit, simultaneously with the display of the normal vertical channels. The triggering source, level, slope and subtle time relationships can be verified and examined continuously and concurrently with the measurements upon the normal vertical channels. The displayed trigger signal is in correct time relationship with the normal vertical channels and the trigger level threshold is identified.

Abstract: A circuit for the comparative vector measurement of keyed radio signal pulses, in particular DME pulses which arrive virtually simultaneously in a plurality of receivers and which can exhibit large level differences is utilized where, in each receiver, the pulses are fed to a switching amplifier which has an amplification which is adjustable in discrete stages and the reduction of which is effected automatically with the rise in the leading edge of the relevant signal pulse, and where, when the relevant switching amplifier of the receivers has been traversed, at a specific measuring time which is common to all receivers, the instantaneous amplitudes and instantaneous phases of the measuring signals are measured, the circuit providing that the pulses are fed to the switching amplifier by way of a delay device and, that for the setting of the amplification of the switching amplifier, a control circuit is provided which is directly fed with the radio pulses and which comprises a logarithmic amplifier and a subse

Abstract: A target seeker circuit contained in a projectile having a trajectory guidance mechanism cross-correlates returns of a cross-polarized antenna pattern to distinguish between target returns reflected by man-made targets and clutter returns reflected by naturally occurring articles to cause the trajectory guidance mechanism to direct the projectile towards the target. One coordinate of diversity in the cross-polarized returns is achieved by changing the RF frequency of the antenna pattern while a second coordinate of diversity is achieved by changing the aspect range of the clutter. The target returns are distinguished from the clutter returns either by comparison to a threshold value which is set in relation to the worst case clutter level or, alternatively, by comparison to an adaptive threshold which is responsive to the dynamic clutter level.

Abstract: A character selector for a shaped beam cathode ray tube comprising an orthogonal pair of air core deflection coils each of which consists of two identical halves formed to fit snugly over the neck of the cathode ray tube. The coils are continuous windings of electrically conductive material and comprise three sections which in operation cause an on-axis electron beam to be sequentially deflected off-axis, converged back to the axis and then referenced along the axis so that the final path of the beam, sequentially deflected on off-axis excursion paths through various shaping apertures in a stencil, is dependent of its off-axis excursion. The character selector may include magnetic material placed over at least a portion of the windings to provide a fine adjustment of the relative magnetic field strength as well as for enhancing the magnetic efficiency and shielding of the device.

Abstract: A transponder-responder system is provided which comprises a home station and at least one remote station. A transmitter at the home station periodically generates interrogation pulses by means of a directional sweep antenna across a search area. Each remote station includes a receiver and transmitter. Upon receipt of an interrogation pulse by the remote station receiver and while enabled, the remote station transmitter transmits a digitally encoded response signal which is received by a receiver at the home station. Upon receipt of the response signal by the home station receiver, timing circuitry at the home station determines the distance between the home and remote station by measuring the elapsed time between the transmission of the last interrogation pulse and the receipt of the response signal. Additionally, the home station includes circuitry which determines the rotational position of the sweep antenna and circuitry which decodes the response signal.

Abstract: 1. A rugged combustion-heated electron tube comprising: a metallic conica-shaped anode structure; a metallic conically-shaped cathode structure insulatedly and coaxially mounted in spaced relationship to said anode structure; a metallic conically-shaped grid structure insulatedly and coaxially mounted in spaced relationship between said anode structure and said cathode structure; first and second annular insulating spacer-seals separating said anode structure from said grid structure and said grid structure from said cathode structure, said spacer-seals in combination with said anode structure and said cathode structure providing a hermetically-sealed envelope containing said grid structure; and a combustible material mounted exteriorly of said envelope in proximity to said cathode structure, said combustible material being adapted to heat said cathode structure to an operating temperature.

Abstract: The antenna arrangement for radar or direction finding purposes, respectively, has sum and difference patterns for mono-pulse operation comprising a reflector and at least two linearly polarized exciters located approximately in the center between which perpendicular to their polarization direction a metallic conductive plane partition is disposed which extends to the reflector and stands perpendicularly thereon, wherein the partition does not extend through the entire reflector from edge to edge but is arranged only approximately in the area of the exciters.

Abstract: A color cathode ray tube preferably of the single gun, plural beam type wherein the beams originate on a horizontal or vertical straight line and are directed into a field produced by a horizontal-vertical electromagnetic deflection yoke at predetermined incident angles to each other so as to converge at a color screen, is provided with a magnetic yoke, for example, secured to the electron beam convergence plates at the end of the electron gun so as to be disposed in the path of the leakage flux produced by the horizontal-vertical electromagnetic deflection yoke, and thereby impart a further vertical or horizontal deflection field to at least one of the plural beams for correcting a deviation between the positions of rasters on the color screen produced by the plural beams.