1. In an apparatus for locating targets by a radar system operating with very short electromagnetic waves, particularly for locating low-flying targets so that the antenna radiation pattern of said system touches ground, wherein a speed selection is combined with a distance selection, the line interval of the operating spectrum being greater than 2( v.sub.max /.lambda.), where v.sub.max = the maximum radial speed of the target relative to the system and .lambda. = the operating wave length of th...

1. In combination: means located at an operating site for transmitting signals and for receiving those signals which are reflected by moving targets; and means connected to said transmitting and receiving means for processing those of the received signals which are reflected by targets beginning only at such time as any particular target approaching the operating site first comes to within a predetermined distance of the operating site which predetermined distance is a direct function of the rad...

The radar module comprises a vertical layered block of a planar array antenna, a signal delay section, and a transmitter-receiver section. The planar array antenna comprises: four antenna portions different in beam direction; and a selective connection section for selectively connecting each antenna portion with the signal delay section. Reducing the number of parts, saving the production cost and miniaturizing the apparatus is achieved by an arrangement in which a single transmitter-receiver se...

A radar device for detecting an object in front of the radar device, has a plurality of antennas, wherein the object is detected based on each reception signal received by two or more of the plurality of antennas, a position specification section for specifying a position of the object by using each reception signal received by the two or more of the plurality of antennas; and an object detection section for confirming an existence of the object if the position specified by the position specific...

A dual mode radar seeker comprising a wide-band passive anti-radar antenna system (3) at the rear of a radome (1), operating at relatively low radar frequencies in an amplitude comparison tracking mode, and a high-frequency (W-band) active amplitude-comparison antenna system (5) in the nose of the radome (1) and having a common boresight with the anti-radar system. The active system employs coarse phase shift steering (31, 41) of the antenna `beam` for the transmit and, optionally, also, the rec...

An automotive radar having a high level of azimuth accuracy and a broad detectable range by virtue of preventing leaks of unnecessary waves to receiving antennas is to be provided. A transmitting array antenna 1 and receiving array antennas 2a, 2b are arranged on an antenna plate (grounding conductor plate) 3 which serves to ground the antennas, and radio wave absorbers 4 are arranged on two sides of the edges 15 of the antenna plate 3. The radio wave absorbers 4 may be configured of, for instan...

A radar altimeter is provided that includes a transmitter operable to generate a radio signal at a modulation frequency, and transmit the radio signal toward a ground surface for reflection therefrom to thereby propagate a reflected radio signal. The radar altimeter also includes a receiver operable to receive the reflected radio signal, and determine the altitude of the aircraft based on the modulation frequency of the radio signal and a difference frequency derived from the radio signal and th...

A radar apparatus comprising: a receiving antenna having an array antenna in which a plurality of antenna elements are arrayed in a horizontal direction; and a signal processing section for carrying out recognition of a target existing in a predetermined horizontal bearing range from receive signals received by the receiving antenna, by electrically carrying out horizontal scanning of an antenna pattern of the receiving antenna, wherein at least one of the antenna elements is placed with a shift...

The invention relates to solid-state radar transmitter, comprising a number of amplifier modules (4.i). To prevent the trailing edge of a steer pulse supplied to the radar transmitter from becoming too steep when passing the amplifier modules (4.i) driven in saturation, the supply voltage on at least One amplifier state in each amplifier module (4.i) is switched off just before the end of the steer pulse.

High-frequency signals from an oscillator (10) are transmitted, through a power divider (12) and a switch (14), from transmission antennas (T1, T2, T3). Reflection waves reflected by targets are received by reception antennas (R1, R2) to thereafter be fed via a switch (16) to a mixer (18). The mixer (18) is supplied with transmission high-frequency signals from the power divider (12) to retrieve beat-signal components therefrom, which in turn are converted into digital signals for the processing...