Celsiustech Electronics Ab

Nobeltech Electronics Ab

Saabtech Electronics Ab

Christer Eckersten

Lars H Eriksson

Joakim Olofsson

Stefan Felter

Magnus Kamel

Ingvar Backestrand

Bengt-Olof S

In one embodiment, an antenna device includes a scanning reflector, a fixed feeder interacting with the reflector for emitting radar radiation and a detector for detecting reflector passage of at least two different predetermined scanning positions during scanning of the reflector. The antenna device also includes a timer used to determine passage times at the time of reflector passage of the scanning positions. The scanning position of the reflector is predicted at an arbitrary time on the basis of the passage times and a predetermined scanning motion of the reflector. In another embodiment, a method for determining an accurate scanning position for the scanning reflector of the antenna device is disclosed.

Antenna method and device with predictive scan position

The invention relates to a process for determining the relative velocity in the radial direction between two moving objects, using linear frequency modulation with continuous frequency sweeps. A problem in such processes lies in being clearly able. to determine the phase difference. According to the invention, a clear determination is realized by varying the period. length for successive frequency sweeps and using the difference in period length and corresponding phase change in determining the volocity.

Process for determining the relative velocity between two moving objects

The present invention relates to a method for classifying objects detected by a vehicle mounted radar located in front of said vehicle for transmitting a radar microwave signal and for receiving reflexes thereof from objects positioned in front of said vehicle, said melted comprising the steps of: tracking a radar reflex from an object located in front of said vehicle as the calculated distance from said vehicle to said object, as derived based upon the time of flight of said radar reflex, decreases; monitoring changes in the amplitude of said radar reflex from said object is said calculated distance from said vehicle to said object decreases; and classifying said object as an overhead object or a ground level object based upon the said changes in the radar reflex amplitude.

Method and device for classifying overhead objects

Method and an apparatus for controlling an oscillator for generating a

In a method for tracking a radar target the imaginary part of the complex elevation error signal is utilized and the value of the complex elevation error signal is calculated for a plurality of frequencies in a repeated sequence. The value change between the different frequencies is used for determining the position within an unambiguous interval and the values calculated at the zero crossing are utilized as measure of the inclination which in turn is compared with inclinations calculated for zero crossings in a general case, whereby a single-valued (unambiguous) interval and position can be determined and thereby the associated elevation angle or target height can be calculated. The method is specifically useful for tracking at low height where multi-path propagation poses a problem in tracking according to known methods.

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Jarfalla, Sweden

Christer Eckersten