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| Number | Title | Issue Date |
| 4524931 | Device for indicating a certain proximity between movable units A device for indicating a certain proximity between movable units emitting to the units a synchronizing signal with a very high transmission speed. A transmitter device is situated at least on certain of the units. The transmitter device is activated by t... | 06/25/1985 |
| 4502052 | Passive data acquisition and analysis system for microwave A passive data determination system (10) for use in a traveling projectile (12) is provided including a logarithmic receiver (20) for receiving a power signal Pr from a source target (14) and emitting in response thereto an output voltage signa... | 02/26/1985 |
| 4445120 | Radiosonde An apparatus and method of measuring elevation of vehicles, such as radiodes, aircraft, or re-entry vehicles, is provided by identifying the specific geographic location of the vehicle in question and its difference from the geographic location of a refe... | 04/24/1984 |
| 4422076 | Passive synthetic aperture system for locating a source of electromagnetic radiation A vehicle-mounted passive synthetic aperture system for locating a source of electromagnetic radiation having a given wavelength λ. The system includes first and second receiving antennas, a phase sensitive receiver and a signal processor. The first and ... | 12/20/1983 |
| 4405926 | Methods and apparatus for warning aircraft of the presence and direction of electrical transmission lines Electrical transmission lines are a collision hazard to low-flying aircraft, especially helicopters. Warning of the proximity and bearing of such lines is provided by equipping the aircraft to detect the alternating magnetic flux produced by such lines. T... | 09/20/1983 |
| 4393382 | Direction finding and ranging system for locating scanning emitters Three or more receiving antennas are arrayed in a triangle that in turn is oriented in the same generally defined plane as a scanning RF beam emitted by a distant source of radar or other RF transmission, which is to be located. Signals received by the ar... | 07/12/1983 |
| 4370656 | Use of bistatic radar system for determining distance between airborne aircraft A bistatic passive radar system and method for airborne use in a first aircraft in conjunction with a host transmitter located in a second aircraft that may be at a different altitude than the first aircraft, characterized by a system and method for deter... | 01/25/1983 |
| 4359739 | Method and apparatus for navigation through predetermined loitering paths A method and apparatus are described for navigating an object, such as an aircraft, through a loitering path with respect to a central station, such as a ground station, which transmits timing signals for use in determining range therefrom. In the describ... | 11/16/1982 |
| 4339755 | Passive-type range determining system using scanning receiving devices A pair of scanning, directional receiving antennas mounted in spaced relation on a monitoring aircraft are synchronously driven at a given scan rate ωs and at the same phase angle with respect to the broadside of the antenna pair so that the r... | 07/13/1982 |
| 4316193 | Servo loop processor A servo loop processor suitable for use in a passive radar range determining system is disclosed. Early and late overlapping video pulse trains derived from spaced receiving antennas are fed to separate first and second channels and are sampled and held f... | 02/16/1982 |
| 4313183 | Acoustic distance measuring method and apparatus An acoustic distance measuring device using a predetermined frequency shift keyed bit pattern as the acoustic signal transmitted and received. A phase lock loop detector is provided. Variations in lag from the time required for the loop to lock are elimin... | 01/26/1982 |
| 4301455 | Groundspeed measurement system A measurement system for determining the groundspeed of an aircraft during final approach and landing, by measuring at the aircraft the Doppler shift of a radio signal, and/or its modulation components, transmitted by a fixed ground station. The carrier s... | 11/17/1981 |
| 4298874 | Method and apparatus for tracking objects Two spaced bodies, each including at least two independently oriented radiating antennas, are in communication with each other by such means as an electromagnetic field. The first body receives radiation transmitted from the second body and establishes th... | 11/03/1981 |
| 4283726 | Dual frequency distance measuring system A radio frequency distance measuring system and method where two continuous wave carrier signals, derived from a stable frequency source, are radiated from a known reference point. The frequency of the first continuous wave carrier signal is displaced fro... | 08/11/1981 |
| 4281327 | Range corrector circuit for a bistatic passive radar display The range corrector circuit uses two counters, one for the apparent range (Ra) and one for the correct range (Rc), and a random access memory (RAM). The Rc counter is continuously incremented linearly and the Ra... | 07/28/1981 |
| 4268167 | Distance measuring system System for measuring the distance between a central location and any number of remote locations. Two parallel beams of radiation emanate outwardly from the central location, and the beams are rotated at a known angular velocity. The time required for each... | 05/19/1981 |
| 4238785 | Zero-doppler shift positioning technique A system for locating forward observation posts with respect to a base ston. A continuous electromagnetic wave with frequency fo is transmitted from an artillery projectile or missile in flight. In addition, a relative time code is transmitted... | 12/09/1980 |
| 4234942 | Apparatus for measuring the length of pipe and other hollow members Pipe measuring apparatus is disclosed. In the preferred embodiment, a transmitter is arranged at one end and a receiver at the other end of the pipe. At the transmitter, there is a tone generator which transmits acoustic signal along the pipe. In addition... | 11/18/1980 |
| 4233588 | Elevator position detector A plurality of identical signal delay elements are disposed within a hoistway one for each landing floor and cascade connected to a signal generator. Each delay element is located at its position where a signal from the signal generator appears at its out... | 11/11/1980 |
| 4229737 | Ranging system and method for determining the range of a vehicle from a plurality of reference points Systems and methods for determining the range from a vehicle to a plurality of reference points. In one system a mobile transceiver is located on the vehicle for transmitting a ranging interrogation signal pulse modulated on an RF carrier having a given f... | 10/21/1980 |
| 4229620 | Mobile radiotelephone station two-way ranging system Some cellular mobile radiotelephone systems use tones for certain call connection supervisory functions on radio links. The presence of the correct tone in a received radio channel call signal is determined by using the received signal for producing (32) ... | 10/21/1980 |
| 4223311 | Long range listening system 1. A system for locating the position of an energy radiating source comprng three radiated energy receiving means arranged in predetermined substantially linear spaced positions and each producing an output signal in response to energy received thereby, ... | 09/16/1980 |
| 4217588 | Object monitoring method and apparatus 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 installe... | 08/12/1980 |
| 4199760 | Method for measuring range to a rocket in flight employing a passive ground tracker station A passive radio frequency (rf) sensor is used to track the beacon of a bastic nonguided rocket. Azimuth and elevation data are obtained in conventional radar fashion, but range data is obtained by range tracking the beacon pulse which is timed by a preci... | 04/22/1980 |
| 4187491 | Doppler compensated PSK signal processor A Doppler compensated PSK signal processor which receives a plurality of sages from a sensor array and decodes each message for further data processing. The signal processor compensates for the Doppler shift in the message frequency due to the velocity d... | 02/05/1980 |
| 4182990 | Radar receiver and method of indicating range to a radar source A radar receiver for indicating the presence of a source of microwave energy includes an antenna, a modulation oscillator and modulator diode, a detector diode connected to bandpass amplifier stages, a peak detector providing a signal proportional in leve... | 01/08/1980 |
| 4179697 | Passive ranging method The present invention relates to a target location method, and more particularly to such a system using passive listening devices to determine the range, course and speed of one or more targets simultaneously. The invention may be used effectively against... | 12/18/1979 |
| 4177465 | Near-range personnel beacon locator apparatus A near-range personnel beacon locator apparatus utilizing a tuned tank circuit to receive the emitted signal from an activated personnel beacon. The detected signal is applied to a D.C. amplifier to provide a D.C. level which drives a controlled variable ... | 12/04/1979 |
| 4176357 | Passive method and apparatus for radar locating and parasitic surveilance 1. Receiving apparatus capable of passively locating a remote emitting radar comprising, receiving means for intercepting and amplifying the pulses and echo signals from the radar so as to produce a video output, gate circuit means connected to receive sa... | 11/27/1979 |
| 4173008 | Method and apparatus for passive detection of marine objects A method and apparatus for passively detecting, locating and tracking submerged or waterborn objects which generate acoustic radiation as they move through the water, includes a hydrophone array which is linked to a monitoring station by cable or radio tr... | 10/30/1979 |
| 4170776 | System for near real-time crustal deformation monitoring A system for use in detecting earth crustal deformation using an RF interferometer technique for such purposes as earthquake predictive research and eventual operational predictions. A lunar based RF transmission or transmissions from earth orbiting satel... | 10/09/1979 |
| 4149168 | Sequentially balanced modulation tone ranging system and method A carrier signal of a first frequency is mixed with a tone signal of a second frequency to produce an upper sideband signal at a frequency equal to the sum of the first and second frequencies and to produce a lower sideband signal at a frequency equal to ... | 04/10/1979 |
| 4055830 | Sonic measuring system A distance measuring system which utilizes sound waves. The first unit can be separate or combined radio transmitter and sound sensor which is held at one of the two points between which the distance is to be measured. This sound sensor unit also has a ra... | 10/25/1977 |
| 4041494 | Distance measuring method and apparatus The direction and/or distance between a fixed point and a vehicle or between two vehicles located on a common vehicle way are measured by an intermediate frequency interferometric technique wherein signals are transmitted from a single antenna to a receiv... | 08/09/1977 |
| 4023176 | Beacon tracking display system A display system is disclosed for use in connection with a beacon tracking receiver. The display system provides both audible and visual displays for use in locating a source of radio transmission. The display includes an audible tone signal to indicate t... | 05/10/1977 |
| 4021807 | Beacon tracking system A radio frequency transmitter is hidden within a packet of currency which may be mingled with other currency packets in the cash drawer of a bank, convenience store or other such commercial institution. The transmitter is automatically activated by unauth... | 05/03/1977 |
| 4008470 | Passive ranging system A passive ranging system for determining the range of a target radar by uizing the scan characteristics of the target radar. Receivers are placed on each of two aircraft flying in a specified formation. One aircraft relays detected pulse amplitude envelo... | 02/15/1977 |
| 4001828 | Beacon tracking receiver A radio frequency receiver is responsive to signals radiated by a remote transmitter. The receiver includes at least one pair of antennas separated by approximately one-half wavelength at the transmitter frequency. The phases of the signals detected by th... | 01/04/1977 |
| 3998410 | Apparatus and method for detecting a digital change in data In a DME system, the least significant decade of the present aircraft to ground station distance is maintained encoded in a memory, and an up-down counter maintains a variable count. The complement of the present distance is compared with the present coun... | 12/21/1976 |
| 3953856 | Method and apparatus for mapping and similar applications This invention relates to an improvement in the art of position determination and in particular to the art of mapping, surveying, station keeping, and the like, employing moving craft and measuring quantities linearly related to the simultaneous variation... | 04/27/1976 |
