Space-based multi-channel moving target radar receiving and processing system

Abstract

The invention belonging to the field of radar technology discloses a space-based multi-channel moving target radar receiving and processing system so that a problem of the great influence on the dynamic range of the system by strong clutters in stealth target monitoring can be solved. The system is composed of M antenna sub arrays, M radio-frequency receiving channels, M first real-time delay units, M second real-time delay units, and M-1 operational amplifiers that are arranged in sequence along the moving direction of a satellite platform, wherein the M is larger than or equal to 2. Each antenna sub array sends a received echo signal to one corresponding radio-frequency receiving channel; the radio-frequency receiving channels carry out down conversion on the echo signals to obtain intermediate-frequency signals, divide the signals into two paths, and output the processed signals to the operational amplifiers by a delay way, wherein the delay difference of the two paths is 1 / PRF; theoperational amplifiers carry out cancellation on adjacent pulse signals of the adjacent channels to reduce the strength of clutters entering the data acquisition system. Therefore, the requirement for high-order-digit AD chips is reduced; the high effective precision of echo data is ensured; and weak target detection by a space-based early-warning radar is guaranteed.

Description

technical field [0001] The invention relates to a receiving and processing system and method for a space-based multi-channel moving target radar, belonging to the field of radar technology. Background technique [0002] Space-based early warning radar is in the working state of looking down. In order to detect high-speed stealth targets in the air, especially stealth weak targets, a huge power-aperture product is required to meet the required signal-to-noise ratio requirements. Pointing to the earth, the clutter echo power is also greatly increased. The clutter energy is much higher than the echo energy of the moving target in the air and the background noise (the clutter-to-noise ratio can be as high as 60dB or more). Influenced by sensitivity, the root mean square of the input noise of the AD converter generally needs to be greater than the quantization level of its least significant bit. At this time, strong clutter will easily cause AD saturation, and strict requirements...

AI Technical Summary

Problems solved by technology

[0004] The technical problem of the present invention is to overcome the problem that the high-digit AD acquisition chip of the existing space-based early warning radar system is difficult to obtain, and propose a space-based multi-channel moving target radar receiving and processing system and method to reduce ground clutter power, thereby reducing the impact on The requirement of high-digital AD chips ensures the effective accuracy of echo data and provides protection for space-based early warning radars to detect weak targets

Images