摘要:
Device and a method for locating a mobile object approaching a surface reflecting electromagnetic waves. The location device includes an emission antenna and a reception antenna. The emission antenna has one or more emission positions emitting a detection signal toward the mobile object. The reception antenna has at least one column of one or more reception positions, receiving a signal transmitted by the mobile object. An emission of the detection signal is activated on each emission position. An emission position that produces a detection by the reception antenna, of the signal of maximum energy transmitted by the mobile object, is selected to track the mobile object. One or more signals of maximum energy, received by one or more reception positions, are used to angularly locate the mobile object. The invention can be used to determine the position of an aircraft in the final landing phase for a guidance device.
摘要:
A method of detecting the division of a radar target can detect a target, for instance caused by the release of a weapon from an aircraft which is tracked by a monopulse radar whose antenna is aligned onto the target with the aid of azimuth and/or elevation difference signals. Division of the radar target can be detected irrespective of whether the target is equipped with and uses an interference transmitter, by establishing a search channel in the radar difference channels. This channel has a sensitivity which is very low in a direction towards the tracked target, but which increases rapidly in directions which deviate somewhat from the direction towards the target. The search channel can be established by comparison of the absolute values of the signal levels in the difference channels with a threshold value.
摘要:
A radar, notably for the correction of artillery fire, comprises means for an antenna scan, in bearing, in a limited zone .DELTA.G around a central position coinciding with the objective in that, and means to compare the received signals with a set of reference signals representing the responses awaited from virtual targets that are evenly spaced out, in bearing, within the monitored space .DELTA.G.
摘要:
A static-split tracking radar system with substantially improved performance. The system includes parallel signal processing channels for processing sum and difference signals from a target-seeking aerial array, to produce target tracking signals. Novel means are provided for trimming relative phase and gain of these channels to achieve substantially perfect matching, which gives a receiver stability sufficient for homing head use in a guided missile system. The system also includes a receiver for acquiring a reference frequency signal, the receiver having novel bandwidth adaptation and doppler tracking facilities. Other novel features provide improved clutter rejection and jamming immunity.
摘要:
To improve the accuracy of angular measurements in a radar system by suppressing noise due to target glint, an angular-deviation signal .epsilon. derived from the output signals .SIGMA. and .DELTA. of a sum channel and a difference channel is gated so as to be read only when the sum signal .SIGMA. is at or near a maximum. In a more elaborate embodiment, passage of the deviation signal .epsilon. is also blocked when a quadrature-deviation signal .epsilon.q, likewise derived from the sum and difference signals .SIGMA. and .DELTA., has an absolute magnitude above a preferably adjustable threshold.
摘要:
1. In an angle tracking radar receiver, first means for generating a first signal representing the angular deviation relative to the radar tracking axis of a predetermined target, second means for generating a second signal representing the angular deviation relative to said axis of the target nearest the radar, means for comparing said first and second signals and for generating a first control signal upon the inequality of said first and second signals, means for sensing the closure within a predetermined range interval of said predetermined target and another target situated at lesser range, said means for sensing producing a second control signal upon said range closure, utilization signal generating means, and means for applying said first and second control signals to said last-named means to produce said utilization signal upon the concurrence of said first and second control signals.
摘要:
Described herein is an automotive radar system and related processing techniques utilizing a three channel switched antenna to improve the angular resolution of an azimuth tracking radar.
摘要:
Embodiments of a target-tracking radar and methods for responding to fluctuations in target SNR are generally described herein. In some embodiments, the target-tracking radar may be configured to determine whether a target can be considered a point target based on the SNR of received signals and off-boresight error estimates. Measurement-variance estimates generated from the SNR are provided to a target-state estimator when the target is determined to be a point target. When the target is determined not to be a point target, the measurement-variance estimates generated from SNR are not used by the target-state estimator. This may allow targets to be engaged at increased range.
摘要:
An angle tracking radar system particularly for a missile with a steerable antenna and gyros strapped down to the missile body—a ‘partially strapdown’ system. The body rate signals, body acceleration signals where provided, and target position signals are converted into an electronic reference frame which is controlled to align with the target sightline, the above body and target signals being employed to produce estimates of target direction, sightline rate and sightline acceleration for use in controlling the missile.