Abstract: A GPS collision avoidance apparatus which uses Global Positioning System (GPS) information and computer processing to determine the location of man made and natural occurring obstacles to allow a user to avoid a collision with these obstacles. The collision avoidance apparatus has a collision decision processor which analyzes position and motion dynamics data including a direction of motion, a velocity and an acceleration for a user utilizing collision avoidance apparatus to determine whether a collision will occur and then to provide protection for the user in the event a collision is likely to occur.

Abstract: A multistatic radar signature measurement apparatus comprising a curvilin sensor array of photonic sensors which are used to measure the radar cross section of a target. The array of photonic sensors provide for the simultaneous collection of target scattered measurement data over an approximately semi-spherical field of view. Laser light passing through each photonic sensor of the sensor array is modulated by the photonic sensor in direct proportion to the strength/intensity of scattered waves from the target as the scattered waves pass through each photonic sensor of the sensor array. The modulated light from each sensor of the sensor array is then transmitted to an optical switching network which samples the optical signals from the array. The sampled optical signals are next provided to an RF receiver which converts the sampled optical signals to equivalent RF electrical signals.

Abstract: An electromagnetic field sensing apparatus which detects an incoming electromagnetic field and provides an RF electrical signal indicative of the strength of the field. The electromagnetic field sensing apparatus includes a metallic antenna which intercepts the incoming planar electromagnetic wave and provides an electrical signal indicative of the strength/intensity of the field. A microwave amplifier receives the electrical signal, amplifies the signal by a factor of at least 100 and then supplies the amplified signal to an electro-optic modulator. A first light source located along a first optical path transmits polarized laser light through the electro-optic modulator. The electro-optic modulator, in response to the amplified electrical signal modulates the polarized light when the metallic antenna detects the incident electromagnetic wave. A photodetector located along the first optical path detects the modulated light as it exists from the electro-optic modulator.

Abstract: An electromagnetic field sensor for use in a target seeking missile which asures the amplitude, phase, frequency and polarization of an incoming electromagnetic field as well as the angle of arrival of the incident electromagnetic field. A Luneberg lens is mounted in the radome of the missile. The Luneberg lens focuses an electromagnetic wave reflected from a target which then passes through the radome and enters the Luneberg lens on one side of the lens onto a point on the opposite side of the lens. A photonic sensor which may be a single electro-optic modulator or a pair of electro-optic modulators is positioned on the Luneberg lens at the point upon which the incident electromagnetic wave is focused. When a pair of electro-optic modulators are used as the sensor the sensing axis of one of the electro-optic modulators is generally perpendicular to the sensing axis of the other electro-optic modulator.

Abstract: An improved tamper-resistant seal for use with generally U-shaped flexible closure devices, such as tabs and wire wraps, comprising an annular band dimensioned to encircle a flexible closure device and heat-shrinking the band to closely fit about the closure device to prevent removal of the closure device without prior destruction of the annular band.

Abstract: An electromagnetic field sensor apparatus which measures the amplitude, pe, frequency and polarization of an incoming electromagnetic field as well as the angle of arrival of an incident electromagnetic field. A Luneberg lens focuses an incoming electromagnetic wave entering on one side of the Luneberg lens onto a point on the opposite side of the lens. A pair of photonic sensor which may be electro-optic modulators or Pockel cells are positioned on the Luneberg lens at the point upon which the incident electromagnetic wave is focused. The sensing axis of one of the electro-optic modulators is perpendicular to the sensing axis of the other electro-optic modulator. Polarized light is provided to each photonic sensor along an optical path which passes through the sensor. Each photonic sensor modulates the polarized light passing therethrough when the photonic sensor detects the incident electromagnetic wave.

Abstract: An electromagnetic field sensor apparatus which measures the field strength and phase of an incident electromagnetic field as well as the angle of arrival of an incident electromagnetic field. The electromagnetic field sensor apparatus comprises a Luneberg lens which focuses an incoming planar electromagnetic wave entering on one side of the Luneberg lens onto a point on the opposite side of the lens. A photonic sensor is positioned on the Luneberg lens at the point upon which the electromagnetic wave is focused. A light source is located along an optical path which passes through the photonic sensor for transmitting polarized light through the sensor. The photonic sensor modulates the polarized light passing therethrough when the photonic sensor detects the incident electromagnetic wave. A photodetector located along the optical path detects the modulated light as it exists from the photonic sensor.