4 results about "Base line" patented technology

The present application relates to the field of communication radar, in particular to a kind of omnidirectional correlation interferometer real-time direction finding method and system based on spread spectrum signal;Construct omnidirectional antenna array;Utilize radio frequency channel time-sharing switching and receive the array signal of single array plane currently working, obtain baseband signal;A set of fixed base line is distributed to the uniform circular array in the array plane currently working;Based on the pseudo-random code matching the spread spectrum signal generated locally and received, each way of baseband signal is carried out correlation despreading, and the phase difference corresponding to each base line is obtained;The phase difference obtained is input into the phase difference sample library established in advance to carry out matching, calculates similarity function, and the angle stored in the phase difference sample library corresponding to the maximum value of similarity function is determined as the measurement direction angle;The measurement direction angle is carried out data processing, and the optimized measurement direction angle is obtained;The method of the present application has the advantages of full-space coverage, low cost, direction finding precision and tracking precision.

The invention relates to a card clothing (20) for a card (1), and to a card (1). The card clothing (20) has a working direction (16), a foundation (21) and a plurality of clothing tips (26). The clothing tips (26) are formed from U-shaped wire hooks (22) which are pierced through the foundation (21) at a penetration angle (α) and each have limbs (24) forming two clothing tips (26) and a back (23) connecting the two limbs (24). The backs (23) are at a right angle to the working direction (16). The backs (23) form a base plane (29) on a side of the foundation (21) lying opposite the clothing tips (26). The wire hooks (22) have a total height (a) perpendicular to the base plane (29), and the limbs (24) each have a free limb length (c) perpendicular to the base plane (29) protruding from an exit point (27) out of the foundation (21) to the clothing tip (26). The limbs (24) are bent counter to the working direction (16) by a knee angle (β) at a knee height (b) from the clothing tip (26) and perpendicular to the base plane (29). Furthermore, a setting line (28) running perpendicularly to the base line (29) and through the exit point (27) of the respective limb (24) is determined. The clothing tips (26) are arranged on the setting line (28) or by a tip offset (d) away from the setting line (28) in the working direction (16).