Front end system of flat plate type dual-band detector and making method thereof

Abstract

The invention provides a front end system of a flat plate type dual-band detector. The front end system comprises a casing including a cavity, a K-band antenna and an F-band antenna that are embeddedin a surface groove of the cavity. A signal processing board, a K-band RF board, F-band RF board, a K-band intermediate-frequency board and an F-band intermediate-frequency board are received in the cavity; the K-band antenna, the K-band RF board, the K-band intermediate-frequency board and the signal processing board are connected successively and electrically; the F-band antenna, the F-band RF board, the F-band intermediate-frequency board, and the signal processing board are connected successively and electrically; and the signal processing board is connected with a pin connector. In addition, the invention also provides a method of making the same. According to the front end system, with the K-band antenna and the F-band antenna, the cooperative detection of the Kband and the F band isrealized to realize anti-interference detection; the intermediate frequency boards are used for carrying out intermediate-frequency filtering, so that small objects at the distance of 8 to 12cm can be detected and identified, long-distance objects at a distance beyond 29cm can be processed by blind sight, and target signals at distances larger than 20cm are processed by intermediate frequency filtering.

Description

technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to a front-end system of a flat-panel dual-band detector and a manufacturing method thereof. Background technique [0002] Due to its strong ability to resist rain and fog interference, millimeter wave detectors have become one of the main technical means for modern air and ground target detection and obstacle avoidance. Various active interferences may also be received during use. Conventional jammers (i.e. devices with sources of interference) usually generate interference in low frequency bands such as C and X bands. Due to the rapid attenuation of high-frequency electromagnetic waves in the air, higher transmission power is required to interfere with the same intensity of targets at the same distance and size. [0003] Existing technology There have been researches on K-band automotive radar. Since the vehicle target is relatively large, the scattering cross-se...

AI Technical Summary

Problems solved by technology

However, since the anti-jamming machine uses a single frequency point and the frequency is low, it is vulnerable to external interference

[0008] 2) Conventional millimeter-wave detectors have different shapes due to consideration of the electrical performance design of the circuit and antenna structure during development. If the shape is designed to be irregular or uneven, it will have poor conformality with the housing and poor concealment

Conventional millimeter-wave detectors based on on-chip antennas, although the antenna surface is flat, are mostly used for forward detection. 360-degree peripheral vision requires more antenna detection, which increases cost and process complexity, and the beam controllability is poor, so wide-angle detection cannot be achieved

[0009] 3) Most of the conventional detectors do not have the function of selective blinding of large background targets. When the target overlaps with the ground background, the RCS of the ground target is very large (greater than 5m 2 ), and the RCS of short-distance flying targets is small, it is easy to generate false alarms for close-distance targets, which affects the actual detection accuracy

[0010] The patent document with the application number of 201310611790.2 discloses a joint anti-jamming method of space and frequency and introduces an anti-jamming machine in it. The sliding window method realizes multiple FFT transformations in short data, realizes the calculation of the covariance matrix between signals at each frequency point, uses the linear constraint minimum variance criterion to obtain the filtering weights of each narrowband signal, and finally adopts the method of alternate splicing of two-way data , to obtain one channel of data, with high flexibility, but both the hardware and software process of the anti-jamming machine are relatively complicated, the cost is high, and it does not have the function of selective blind vision of large background targets

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