KR100277084B1 - Body Object Detection Device of Pulse Doppler Radar System - Google Patents

Abstract

The present invention relates to a radar system, and more particularly, to an apparatus for detecting a body object of a pulsed Doppler radar system.

The present invention provides a device for detecting a ground object of a pulsed Doppler radar system, and inputs a received signal to a receiving end of the pulsed Doppler radar system to select a signal and equalize a signal through a specific pulse repetition frequency to equalize signal distortion. The signal selection and signal leveling unit inputs a signal selected and leveled to process a high-band signal in the case of a reflected signal of a moving object having a speed higher than a set speed. A Doppler signal processor for processing a Doppler signal into a signal, a target ejector for inputting a signal output from the Doppler signal processor, and extracting a target signal among the processed signals by comparing with a reference value provided by the pulsed Doppler radar system; Among the target signals evicted from the evict A target processing unit for processing Doppler frequency values corresponding to a moving object moving at a low speed and moving by comparing Doppler frequencies of respective angles, and a display unit for displaying a moving body object at a corresponding coordinate value based on a signal value converted by the target non-processing unit It is configured to include.

Description

Body Object Detection Device of Pulse Doppler Radar System

The present invention relates to a radar system, and more particularly, to an apparatus for detecting a body object of a pulsed Doppler radar system.

The radar system is an application of ultra-high frequency technology, in which a high-frequency signal transmitted from a transmitter receives a signal partially reflected by a long-range target by a sensitive receiver and detects the position of the target based on the detected signal. . Among these radar systems, the Pulse Doppler Radar System, when a target moves at a speed along the radar line of sight, the signal output from the transmitter is controlled by the Doppler Effect caused by the target. The received signal is received by the receiver in comparison. However, moving objects that are in flight, ie, staying in a certain space, are hard to detect because they do not have a transition frequency because they remain at almost no speed, and objects and objects that are in flight (CLUTTER, for example, trees, buildings) are difficult to detect. It was difficult to distinguish the signal reflected from a stationary object, such as the back, and thus it was impossible to detect the exact target position.

Accordingly, an object of the present invention is to provide an apparatus for detecting an object in the pulsed Doppler radar system.

In accordance with another aspect of the present invention, there is provided an apparatus for detecting a pore object of a pulsed Doppler radar system, wherein the received signal received at a receiving end of the pulsed Doppler radar system is input to select a signal and distort the signal through a specific pulse repetition frequency. Signal selection and signal leveling unit for leveling the signal, and the signal selection and signal leveling unit inputs the signal selected and leveled in the case of the reflected signal of the moving object having a speed of more than a set speed, processed as a high-band signal, ultra low speed In the case of the reflected signal of the moving object, a Doppler signal processor for processing a Doppler signal into a low band signal and a signal output from the Doppler signal processor are inputted and compared with a reference value provided by the pulsed Doppler radar system to extract the target signal among the processed signals. Target eviction part and said target ouster A target processing unit for processing a Doppler frequency value corresponding to a moving object moving at a low speed and air by comparing the respective Doppler frequencies among the target signals extracted from the unit, and waiting at a corresponding coordinate value based on the signal value converted by the target non-processing unit. And a display unit for displaying a moving object.

1 is a block diagram showing an internal configuration of an apparatus for detecting a body object of a pulsed Doppler radar system according to an embodiment of the present invention.

FIG. 2 is a detailed block diagram of the signal selection and equalization unit of FIG. 1. FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

1 is a block diagram showing an internal configuration of a body object detecting apparatus of a pulsed Doppler radar system according to an embodiment of the present invention.

The body-object detection device is a signal selection and leveling unit 111 for performing signal selection and signal leveling of a signal received through a receiver of the pulsed Doppler radar system, and a Doppler signal for signal leveling through the signal selection and leveling unit. A first target to evict the first Doppler signal processor 113 and the second Doppler signal processor 121 and the Doppler signal processed signals through the respective Doppler signal processors, respectively, and extract a signal corresponding to the target. The first target processing unit 117 and the second target processing unit 125 for doppling and synthesizing the unit 115 and the second target extracting unit 123, the signals of the targets evicted through the target extracting unit, and the second target processing unit 125; It comprises a display unit 119 for displaying on the basis of the target signal through the target processing unit 117.

FIG. 2 is a detailed view illustrating the signal sorting and leveling unit 111 of FIG. 1 in detail.

The signal selection and leveling unit 111 may include a first pulse adjusting unit 211 and a second pulse adjusting unit 221, a first pulse selecting and filtering unit 213, a second pulse selecting and filtering unit 223, and A leveling unit 217 for comparing the signals output from the first buffer 215 and the second buffer 225 with the first buffer 215 and the second buffer 225 and leveling the signals based on the difference value. ) And a Doppler filter 219.

Hereinafter, preferred embodiments of the present invention will be described with reference to FIGS. 1 and 2.

First, when the transmitting end of the pulsed Doppler radar system outputs a transmission signal for detecting an object in flight, the outputted transmission signal reaches the object, and the signal reaching the object is reflected in a predetermined form so that the pulsed Doppler radar Received by the receiving end of the system, the received signal is input to the signal selection and leveling unit 111.

The signal input to the signal selection and leveling unit 111 is input to the first pulse adjusting unit 211 and the second pulse adjusting unit 221. The first pulse adjusting unit 211 serves to adjust the function value of the pulse repetition frequency, and the reason for adjusting the function value of the pulse repetition frequency is that the signal received because the pulse repetition frequency is different when selecting and filtering pulses This is to prevent the magnitude of the signal from being distorted, and outputs a signal whose pulse repetition frequency function value is adjusted to filter the signal received through the first pulse adjusting unit 211 to the first pulse sorting and filtering unit 213. do. The first pulse sorting and filtering unit 213 selects pulses through a fixed pulse repetition frequency provided by the pulsed Doppler radar system in order to select a signal pulse from a pulse repetition frequency that shifts in response to the received signal. After the filtering is performed using the fixed pulse repetition frequency, the filtered signal is output to the first buffer 215. The first buffer 215 inputs the filtered signal output from the first pulse sorting and filtering unit 213, and converts the input signal into parallel signals so as to facilitate Doppler signal processing. Output to (217).

On the other hand, when the received signal is input to the signal sorting and leveling unit 111 of the pulsed Doppler radar system, a control unit (not shown) of the pulsed Doppler radar system outputs a testing signal for removing ground clutter. The testing signal is input to the second pulse adjusting unit 221. The second pulse adjusting unit 221 performs the same role as the first pulse adjusting unit 211 based on the clutter signal, and then outputs a signal whose pulse repetition frequency function value is adjusted to the second pulse sorting and filtering unit. Output to (223). The second pulse sorting and filtering unit 223 in the pulsed Doppler radar system for selecting a signal pulse from the pulse repetition frequency that transitions the signal output from the second pulse adjusting unit 221 corresponding to the received signal After the pulse is selected through the fixed pulse repetition frequency provided, filtering is performed using the fixed pulse repetition frequency, and the filtered signal is output to the second buffer 225. The second buffer 225 inputs the filtered signal output from the second pulse sorting and filtering unit 223, and converts the input signal into parallel signals so as to facilitate Doppler signal processing. Output to the unit 217.

The leveling unit 217 has already selected a pulse as a fixed pulse repetition frequency value provided by the pulsed Doppler radar system in the first pulse sorting filtering unit 213 and the second pulse sorting and filtering unit 223. The received signal has many sources of variation. In particular, since the signal reflected from the object in flight is a region where a large number of disturbance signals, that is, clutter signals, distortion of the signal occurs severely. Therefore, the distortion level caused by the ground clutter is equalized by comparing the received signal currently being processed with the test signal value output from the second pulse adjusting unit 221 to remove the ground clutter. The signal leveled by the ground clutter by the leveling unit 217 is output to the Doppler filter 219. The Doppler filter 219 filters the signal output from the leveling unit 217 and outputs the signal to the second Doppler signal processor 121 when the desired signal is a low pass signal. The second Doppler signal processor 121 inputs a Doppler signal by inputting the signal output from the signal selection and leveling unit 111, and extracts the Doppler component included in the received signal to generate a second target extractor 123. Will output At this time, the processing region of the processed Doppler signal uses a low frequency band to measure the signal reflected from the stationary object. The second target extracting unit 123 inputs the Doppler component output from the second Doppler signal processing unit 121, and extracts a target signal among the input Doppler components based on a preset value and separates it into a precision section. The target is extracted and the extracted target signal is output to the second target processing unit 125. The second target processing unit 125 compares the frequencies included in the target signal output from the second target extracting unit 123, and extracts a target signal corresponding to the animal body to the first target processing unit 117. Output The first target processor 117 synthesizes the target signal evicted by the first Doppler signal processor 113 and the first target ejector 115 and the target signal evicted by the second target processor 125. Transfer to display unit 119. The display unit 119 inputs a target signal output from the first target processing unit 117 and displays a target at a point of coordinate value corresponding to the signal.

As described above, the embodiments of the present invention have been described with reference to the drawings, for example, but various changes and modifications can be made within the scope allowed by the matter.

As described above, the present invention separates ground objects from ground clutters, i.e., jammers such as buildings and mountains, and processes Doppler signals, thereby making it possible to detect not only moving objects but also moving objects. .

Claims (2)

In the body object detection device of the pulse Doppler radar system, A signal sorting and signal leveling unit for inputting a received signal received at a receiving end of the pulsed Doppler radar system and equalizing signal distortion and signal distortion through a specific pulse repetition frequency; The signal selection and signal leveling unit inputs a signal selected and leveled to process a high band signal in the case of a reflected signal of a moving object having a speed higher than a set speed. A Doppler signal processor for signal processing; A target ejector for inputting a signal output from the Doppler signal processor and extracting a target signal among the processed signals by comparing with a reference value provided by the pulsed Doppler radar system; A target processing unit for processing a Doppler frequency value corresponding to a moving object at low speed and air by comparing Doppler frequencies of the target signals evicted by the target extracting unit; And a display unit configured to display an air moving object at a corresponding coordinate value based on the signal value converted by the target unprocessing unit. In the body object detection device of the pulse Doppler radar system, A first pulse adjusting unit for adjusting a function value of a pulse repetition frequency to prevent distortion of a signal due to a difference in a pulse repetition frequency when a signal reflected from a target received through the receiver of the pulsed Doppler radar system is input; After selecting the pulse through the fixed pulse repetition frequency provided by the pulse Doppler radar system in order to select the signal pulse from the pulse repetition frequency to transition by inputting the signal output from the first pulse adjusting unit and the fixed pulse repetition frequency A first pulse sorting and filtering unit performing filtering using A first buffer converting the signal output from the first pulse sorting and filtering unit into a parallel signal for Doppler signal processing; A second pulse adjusting unit for inputting a testing signal for removing ground clutter provided by the pulsed Doppler radar system and adjusting a frequency function value when a signal reflected from a target received through the receiving end of the pulsed Doppler radar system is input; Wow, A second pulse sorting and filtering for inputting a frequency function value adjusted signal output from the second pulse adjusting unit and selecting and filtering a signal pulse reflected from a target from the transitioning pulse repetition frequency using a fixed pulse repetition frequency; Wealth, A second buffer for converting a signal output from the second pulse sorting and filtering unit into a parallel signal for processing a Doppler signal; A leveling unit which collects the signals output from the first buffer and the second buffer and compares the received signal currently being processed with a test signal value for removing the ground clutter and equalizes the distortion caused by the ground clutter; A signal sorting and leveling unit including a Doppler filter for filtering the signal output from the leveling unit; The signal selection and signal leveling unit inputs a signal selected and leveled to process a high band signal in the case of a reflected signal of a moving object having a speed higher than a set speed. A Doppler signal processor for signal processing; A target ejector for inputting a signal output from the Doppler signal processor and extracting a target signal among the processed signals by comparing with a reference value provided by the pulsed Doppler radar system; A target processing unit for processing a Doppler frequency value corresponding to a moving object at low speed and air by comparing Doppler frequencies of the target signals evicted by the target extracting unit; And a display unit configured to display an air moving object at a corresponding coordinate value based on the signal value converted by the target unprocessing unit.