Abstract: An AWTSS is shown to be made up of an improved synthetic aperture radar (SAR) for generating radar maps with various degrees of resolution required for navigation of an aircraft and detection of ground targets in the presence of electronic countermeasures and clutter. The SAR consists, in effect, of four frequency-agile radars sharing quadrants of a single array antenna mounted within a radome on a "four axis" gimbal with a sidelobe cancelling subarray mounted at the phase center of each quadrant. Motion sensors are also mounted on the single array antenna to provide signals for compensating for vibration and stored compensating signals are used to compensate for radome-induced errors. In addition, a signal processor is shown which is selectively operable to generate radar maps of any one of a number of desired degrees of resolution, such processor being adapted to operate in the presence of clutter or jamming signals.

Abstract: An AWTSS is shown to be made up of an improved synthetic aperture radar (SAR) for generating radar maps with various degrees of resolution required for navigation of an aircraft and detection of ground targets in the presence of electronic counter-measures and clutter. The SAR consists, in effect, of four frequency-agile radars sharing quadrants of a single array antenna mounted within a radome on a "four axis" gimbal with a sidelobe cancelling subarray mounted at the phase center of each quadrant. Motion sensors are also mounted on the single array antenna to provide signals for compensating for vibration and stored compensating signals are used to compensate for randome-induced errors. In addition, a signal processor is shown which is selectively operable to generate radar maps of any one of a number of desired degrees of resolution, such processor being adapted to operate in the presence of clutter or jamming signals.

Abstract: An AWTSS is shown to be made up of an improved synthetic aperture radar (SAR) for generating radar maps with various degrees of resolution required for navigation of an aircraft and detection of ground targets in the presence of electronic counter-measures and clutter. The SAR consists, in effect, of four frequency-agile radars sharing quadrants of a single array antenna mounted within a radome on a "four axis" gimbal with a sidelobe cancelling subarray mounted at the phase center of each quadrant. Motion sensors are also mounted on the single array antenna to provide signals for compensating for vibration and stored compensating signals are used to compensate for radome-induced errors. In addition, a signal processor is shown which is selectively operable to generate radar maps of any one of a number of desired degrees of resolution, such processor being adapted to operate in the presence of clutter or jamming signals.

Abstract: A method of aligning two images of the same scene by matching features in a first image to features in a second image is disclosed. The method comprises identifying edges of objects in the first image using two different processes. The edges identified using both processes are compared and combined into one image representing confirmed edges which are readily identified in other images of the same scene. A template is then formed from the confirmed edges which is matched to a subregion of the second image.

Abstract: A method of aligning two images of the same scene by matching features in a first image to features in a second image is disclosed. The method comprises identifying edges of objects in the first image using two different processes. The edges identified using both processes are compared and combined into one image representing confirmed edges which are readily identified in other images of the same scene. A template is then formed from the confirmed edges which is matched to a subregion of the second image.

Abstract: An AWTSS is shown to be made up of an improved synthetic aperture radar (SAR) for generating radar maps with various degrees of resolution required for navigation of an aircraft and detection of ground targets in the presence of electronic counter-measures and clutter. The SAR consists, in effect, of four frequency-agile radars sharing quadrants of a single array antenna mounted within a radome on a "four axis" gimbal with a sidelobe cancelling subarray mounted at the phase center of each quadrant. Motion sensors are also mounted on the single array antenna to provide signals for compensating for vibration and stored compensating signals are used to compensate for radome-induced errors. In addition, a signal processor is shown which is selectively operable to generate radar maps of any one of a number of desired degrees of resolution, such processor being adapted to operate in the presence of clutter or jamming signals.

Abstract: A radio frequency (RF) amplifier circuit includes an input matching network having a first port coupled to an input port of the circuit. The RF amplifier circuit further includes a high electron mobility field effect transistor (HEMT) having source, gate and drain electrodes with the gate electrode coupled to the second port of the input impedance matching network and means, coupled between the source electrode and a DC reference potential, for providing inductive feedback to the source electrode of the HEMT. The RF amplifier circuit further includes an output matching network having a first port coupled to the drain electrode of the HEMT. The output matching network comprises a first RF propagation network having a first end coupled to the first port of the output matching network and a second end coupled to a first electrode of a capacitor. A second electrode of the capacitor is coupled to a second port of the output matching network.

Abstract: An oscillator includes an amplifier having an input and an output and a feedback circuit disposed between the input and the output of the amplifier. The feedback circuit includes a plurality of resonators and a pair of switches. Each switch includes a first port and multiple connectable ports, the multiple connectable ports of each switch connected to a corresponding one of the plurality of resonators. The feedback circuit further includes a voltage-controlled phase shifter disposed in series with the switches. The oscillator further includes a discriminator circuit, responsive to signals from the feedback circuit, for providing a control signal to the voltage-controlled phase shifter for degenerating low frequency noise within the oscillator. With such an arrangement, high Q low noise resonators can be switched in and out of the circuit thus providing improved phase noise performance at high power levels with the desirable frequency agility required for a microwave oscillator.

Abstract: A timing delay circuit includes a first transistor having a control electrode coupled to an input terminal, a reference electrode coupled to a first DC bias terminal and an output electrode coupled to an output terminal of the timing delay circuit. The timing delay circuit further includes a second transistor having a control electrode coupled to the input terminal, a reference electrode coupled to a second DC bias terminal and an output electrode. The timing delay circuit further includes a third transistor having a control electrode coupled to the output electrode of the second transistor, a reference electrode coupled to the second DC bias terminal and an output electrode coupled to the output terminal of the timing delay circuit.

Abstract: A frequency multiplier is shown to include either a frequency doubler or a frequency tripler coupled to an amplifier with a temperature compensation circuit and a feed forward gain control loop. With such an arrangement, a frequency multiplier is provided wherein variations of an output signal of the frequency multiplier are minimized due to changing characteristics of the frequency multiplier caused by ambient temperature variation or from a varying input signal level.

Abstract: An optical system focuses a portion of electromagnetic energy into a spot on a focal plane and rotates the focused spot about an optic axis. A plurality of detectors is disposed in a detector plane. The array of detectors is arranged in a plurality of sets of such detectors. Each one of such sets of detectors is disposed along a different region extending radially from a central region of the array. When the detector and focal planes are skewed, a processor processes signals produced by a selected one of the plurality of sets of detectors. The selected one of the sets is the set disposed in one of the radially extending regions disposed along, or adjacent to, a line formed by the intersection of the skewed detector and focal planes.

Abstract: A mixer having a diode pair which includes a first RF propagation network having a first end coupled to a first terminal of the mixer and a second end coupled to a first electrode of the diode pair. The mixer further includes a first means, coupled to the first RF propagation network for providing a low impedance DC signal path to ground and for providing a high impedance signal path to signals propagating at a first radio frequency (RF) frequency. A first transmission line resonator is coupled to the first RF propagation network and has an electrical pathlength which is one quarter of a wavelength at a second RF frequency. The mixer further includes a second RF propagation network having a first end coupled to a second terminal of the mixer and a second end of the RF propagation network coupled to a second electrode of the diode pair.

Abstract: A time delay fuze is shown to include a fuze base having an outer surface with a circular shape and a center cavity with an inner wall having a plurality of bores disposed through the inner wall to the outer surface. The time delay fuze further includes a plurality of encoder rings disposed about the fuze base, each one of the encoder rings having an inner surface with a predetermined arrangement of lands and grooves, the inner surface of each one of the encoder rings disposed adjacent the outer surface of the fuze base and a circuit board having a plurality of switches disposed in the center cavity of the fuze base.

Abstract: A pulse radar for operation at 94 GHz and higher frequencies is shown to include an antenna, a diplexer and first detector that are each optically fed so that radio frequency signals may be, when transmitting, passed through the diplexer to the antenna and, when receiving, from the antenna through the diplexer to the first detector.

Abstract: A method of providing fin commands for a vehicle is shown to include the steps of calculating a pitch-to-roll command ratio equal to an absolute value of a pitch command divided by a roll command and calculating a yaw-to-roll command ratio equal to an absolute value of a yaw command divided by the roll command, differencing the yaw-to-roll command ratio with the pitch-to-roll command ratio to provide a difference value, and apportioning the roll command to at least one of a plurality of control fins in relation to the value of said difference value. With this arrangement, a method of apportioning a roll command to a plurality of control surfaces wherein the maximum deflection required by the control surfaces is minimized by apportioning more roll to the plane having the smaller maneuver.

Abstract: A pulse radar for operation at 94 GHz and higher frequencies is shown to include an antenna, a diplexer and first detector that are each optically fed so that radio frequency signals may be, when transmitting, passed through the diplexer to the antenna and, when receiving, from the antenna through the diplexer to the first detector.

Abstract: An optical system focuses a portion of electromagnetic energy into a spot on a focal plane and rotates the focused spot about an optic axis. A plurality of detectors is disposed in a detector plane. The array of detectors is arranged in a plurality of sets of such detectors. Each one of such sets of detectors is disposed along a different region extending radially from a central region of the array. When the detector and focal planes are skewed, a processor processes signals produced by a selected one of the plurality of sets of detectors. The selected one of the sets is the set disposed in one of the radially extending regions disposed along, or adjacent to, a line formed by the intersection of the skewed detector and focal planes.

Abstract: A method of determining the difference between the actual rotational speed of the body of a guided missile and a nominal rotational speed is shown to consist of the steps of comparing a shaped output of a Hall effect cell with a shaped output of an oscillator and deriving a signal indicative of any difference between the periods of the shaped outputs.

Abstract: A saddle for restraining vibration of a wing of a missile. The saddle has a grooved portion adapted to receive the wing. The saddle has two legs extending away from the grooved portion which are secured to the missile.

Abstract: A guidance system for a homing missile having an observer filter which utilizes signals representative of range, range rate, acceleration normal to the line-of-sight of the missile, acceleration along the line-of-sight of the missile, and line-of-sight rate of the missile to a target is described. The filter includes means, responsive to a lateral acceleration signal, a measured range rate signal and a range signal for providing an estimated line-of-sight rate signal. The measured line-of-sight rate signal and the estimated line-of-sight rate signal are used to produce a difference output signal. The difference output signal is used to produce an error signal which is applied to the providing means to minimize the difference output signal. The estimated line-of-sight rate signal provides a more accurate estimate of the actual line-of-sight rate of the missile to the target than that which can be obtained with a standard proportional navigation system.