KR20130045597A - Method and device for receiving a radar signal digitally based on multi-channel - Google Patents

Abstract

PURPOSE: A multi-channel digital reception method and an apparatus thereof are provided to be directly applicable to a TDOA based positioning system requiring a high definition TOA[Time of Arrival] measurement scalability. CONSTITUTION: An AD converter(100) converts four or more RF signals received from multiple antennas into digital signals. A power measurement and channel selection unit(200) selects a channel having a biggest reception signal and the reception channel of left and right thereof after receiving a multi-channel digital signal from the AD converter and measuring the power of the signal of each channel. A high definition TOA measuring unit(300) measures the TOA of the biggest reception signal by using the high precision visual data of inside or outside in the signal of the biggest reception signal. A channelizer/phase detector(400) measures a signal frequency, a signal strength, a pulse width, and a signal phase. An AOA(Angle of Arrival) measuring unit(500) measures an AOA by using the signal strength of each channel and a phase at the same time. A PDW generating unit(600) generates a PDW as a pulse unit by assembling the measured result and outputs the PDW to an external link device by storing in a fixed time or number. [Reference numerals] (200) Power measurement and channel selection unit; (300) High definition TOA measuring unit; (500) AOA measuring unit; (600) PDW generating unit

Description

Method and device for multichannel digital reception {Method and device for receiving a radar signal digitally based on multi-channel}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-channel digital reception method and apparatus, and in particular, it is possible to measure a high-resolution time of arrival (TOA) from four or more reception antenna signals, and at the same time, a PDW (Pulse Description Word) of signals in pulse units. , And pulse information).

In order to detect the radar signal, the electronic warfare support system receives the radar signal received from all directions and measures the pulse unit variable specification in real time to generate pulse information (PDW: Pulse Description Word, hereinafter referred to as PDW). PDW includes frequency, pulse intensity, time of arrival (TOA), angle of arrival (AOA), and the like. The signal input from four or more antennas must be processed at the same time to detect the direction of the signal, and the high resolution is used for the position estimation using the time difference of arrival (TDOA) in monitoring equipment operated by multiple receivers spaced apart TOA resolution is required.

In the case of the conventional analog field receivers, hardware is required for each function such as a digital frequency discriminator (DFD), a direction detector, a PDW measurement unit, and a successive detection log video amplifier (SDLVA). In addition, the existing digital receiver developed in Korea has a structure of generating a PDW (Pulse Description Word) by digitally processing one channel. As the number of channels increases, a digital receiver must exist for each channel, and a new part for controlling each receiver is required. Therefore, a digital receiver is required to perform all these functions on a single board for miniaturization and light weight. In addition, in a system in which multiple receivers are spaced apart for TDOA-based location detection, a time of arrival (TOA) measurement capability having a resolution of several ns or less is required for accurate location detection. Existing analog and digital receivers are not applicable in TDOA (Time Difference Of Arrival) systems, which require a resolution of 10 ns or more and a few ns or less.

Accordingly, the present invention proposes a multi-channel digital reception method and apparatus capable of generating a pulse description word (PDW) having a high TOA resolution by digitizing a multi-channel RF input signal.

An object of the present invention for solving the problems of the prior art is to measure the time of Arrival (TOA) of the signal from four or more receiving antenna signals, and at the same time PDW (Pulse Description Word, pulse of the signal in pulse units) Information) and a multi-channel digital receiving method and apparatus capable of generating the same.

In order to achieve the object of the present invention, a multi-channel digital receiving apparatus according to an aspect of the present invention, A / D conversion of the N (N is a natural number of 4 or more) or more RF signals received from a plurality of antennas to digital signal AD converter (ADC) to convert to; After receiving a multi-channel digital signal from N channels from the AD converter (ADC) and measuring the power of the signal for each channel, the received signal having the largest intensity of the received signal using the information and the second (Max channel) A power measurement and channel selection unit for selecting a reception channel of a third channel (left and right channels of the Max channel); Time of Arrival (TOA) having a resolution of several ns for a signal having the largest intensity of a received signal using internal or external high-precision time information in the signal of the Max channel selected by the power measurement and channel selector. High resolution TOA measuring unit for measuring; A channelizer for measuring the frequency, signal strength, and pulse width of a signal using a channelizer filter on the Max, 2nd, and 3rd channels selected by the power measurement and channel selector, and measuring the phase of the signal with a phase detector. Phase detectors (channel specification / phaser detectors); An AOA measurement unit for measuring AOA (Angle Of Arrival) by simultaneously using phase and intensity of a signal corresponding to the same frequency for each channel provided from the channelizer / phase detector; And PDW (Pulse Description Word, pulse information) in units of pulses by combining the results measured in the high resolution TOA measurement unit, the channelizer / phase detector (channelizer / phaser detector), and the AOA measurement unit, respectively. It generates and stores a predetermined time or the number of PDW generating unit for output to the external interlocking device.

In order to achieve the object of the present invention, the multi-channel digital reception method according to another aspect of the present invention, A (N is a natural number of 4 or more) received from a plurality of antennas A or more by A / D converter A Converting the digital signal into a digital signal; A multi-channel digital signal is received from N channels from the AD converter (ADC) to measure the power of the signal for each channel by the power measurement and channel selection unit, and then the channel having the largest intensity of the received signal using the information. Selecting reception channels of the (Max channel) and the second and third channels (left and right channels of the Max channel); Time of Arrival (TOA) having a resolution of several ns for a signal having the largest intensity of a received signal using internal or external high-precision time information in the signal of the Max channel selected by the power measurement and channel selector. Measuring; In the Max, 2nd, and 3rd channels selected by the power measurement and channel selector, the signal specifications of the frequency, signal strength, phase, and pulse width information of the signal are converted into a channelizer / phase detector (channelizer / phaser detector). Measuring using; Measuring AOA (Angle Of Arrival) using an AOA measurement unit using the phase and intensity of the signal provided from the channelizer / phase detector at the same time; A PDW (Pulse Description Word) unit of pulses is generated by the PDW generator by combining the results measured by the high resolution TOA measurement unit, the channelizer / phase detector (signal measurer, channelizer / phaser detector), and the AOA measurement unit. Generating pulse information, and storing the pulse information for a predetermined time or number and outputting the pulse information.

The multi-channel digital reception method and apparatus according to the present invention can be made smaller and lighter than a conventional analog receiver or a 1-channel digital receiver by simultaneously digitizing and processing a multi-channel RF signal. In addition, TOA measurement with several ns resolution is possible, which can be directly applied to TDOA-based position detection system requiring high resolution TOA measurement capability.

1 is a block diagram of a multi-channel receiving method and apparatus capable of generating a Pulse Description Word (PDW) having a high resolution TOA (Time of Arrival) according to the present invention.
2 is a Max channel, 2nd, 3rd channel selector using the power of the signal
3 is a high resolution TOA measurement unit.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail the configuration and operation.

The present invention provides a high-resolution TOA (Time of Arrival) measurement from four or more receiving antenna signals, and simultaneously generates a PDW (Pulse Description Word, pulse information) of signals in pulse units. And to an apparatus.

1 is a block diagram of a multi-channel receiving method and apparatus capable of generating a Pulse Description Word (PDW) having a high resolution TOA according to the present invention.

Referring to FIG. 1, the multi-channel digital receiver according to the present invention is an AD converter (ADC) for converting N or more RF signals (N is a natural number of 4 or more) received from a plurality of antennas to A / D conversion into digital signals. 100; After receiving multi-channel digital signals from N channels from the AD converter 100, the power of each channel signal is measured, and the received signal with the largest intensity using the information (Max channel) and 2 A power measurement and channel selection unit 200 for selecting a reception channel of the third and third channels (left and right channels of the Max channel); Time of Arrival (TOA) having a resolution of several ns for the signal having the greatest intensity of the received signal using internal or external high-precision visual information in the signal of the Max channel selected by the power measurement and channel selection unit 200. A high resolution TOA measuring unit 300 measuring arrival time; Measure the frequency, signal strength, and pulse width of the signal using a channelizer filter on the Max, 2nd, and 3rd channels selected by the power measurement and channel selector 200, and measure the phase of the signal with a phase detector. A channelizer / phase detector (signal measurer, channelizer / phaser detector) 400; An AOA measurement unit 500 for measuring AOA (Angle Of Arrival) by simultaneously using the phase and signal strength of a signal corresponding to the same frequency for each channel provided from the channelizer / phase detector 400; The combination of the results measured in the high resolution TOA measuring unit 300, the channelizer / phase detector 400, and the AOA measuring unit 500 combines the PDW (Pulse Description) in pulse units. Word, pulse information) and the PDW generation unit 600 for storing a predetermined time or number and output to the external interlocking device.

The AD converter 100 converts four or more RF signals received from a plurality of antennas into digital signals by A / D conversion.

The power measurement and channel selector 200 receives a multi-channel digital signal in N channels from the AD converter 100, measures the power of the signal for each channel, and then uses the necessary information using the information. Select the receiving channel of the largest channel (Max channel) and the second and third channels (left and right channels of the Max channel).

As shown in FIG. 3, the high-resolution TOA measuring unit 300 collects signals into a buffer 310 for the Max channel and separates the IQ signals by the IQ separation unit 320 having a filter. The time of arrival (TOA) of the pulse is measured using the internal or external high-precision time information 330 at the time point at which the presence of the signal is detected.

The channelizer / phaser detector 400 measures the frequency, signal strength, pulse width, and phase of the signal.

The AOA measuring unit 500 measures AOA (Angle Of Arrival) by using the strength and phase of the signal for each channel at the same time.

The PDW generating unit 600 uses PDW (Pulse Description Word, Pulse) by using information such as high resolution TOA (Time of Arrival), AOA (Angle Of Arrival), frequency, and pulse width. Pulse information) is generated and stored for a certain time or number and output to the external interlocking device.

The multi-channel digital reception method according to the present invention comprises the steps of: (a) converting N or more RF signals received from a plurality of antennas (N is a natural number of 4 or more) by A / D conversion to digital signals; (b) Receiving a multi-channel digital signal in N channels from the AD converter (ADC) 100 and measuring the power (power) of the signal for each channel by the power measurement and channel selection unit 200 and using the information Selecting reception channels of a channel having the largest intensity of the received signal (Max channel) and second and third channels (left and right channels of the Max channel); (c) Using the internal or external high-precision visual information in the signal of the Max channel selected by the power measurement and channel selection unit 200, the number of signals having the greatest intensity of the received signal by the high resolution TOA measurement unit 300 can be obtained. measuring a Time of Arrival (TOA) with ns resolution; (d) Measuring the frequency, signal strength, and pulse width of the signal in the Max, 2nd, and 3rd channels selected by the power measurement and channel selector 200 using a channelizer filter, and measuring the signal with a phase detector. Measuring phase; (e) Measuring AOA (Angle Of Arrival) by the AOA measurement unit 500 using the phase and signal strength of the signal corresponding to the same frequency for each channel provided from the channelizer / phase detector 400 at the same time. Doing; And (f) the PDW generator by combining the results measured by the high resolution TOA measuring unit 300, the channelizer / phase detector (signal measuring unit, channelizer / phaser detector) 400, and the AOA measuring unit 500, respectively. And generating a PDW (Pulse Description Word, pulse information) in units of pulses by 600, and storing the PDW (Pulse Description Word, pulse information) in a predetermined time or number and outputting the same to an external interlocking device.

The step (b) selects Max, 2nd, and 3rd channels as the size of the signal in the N channels digitized by the power measurement and channel selection unit 200, and the Max channels include PDW (Pulse Description Word, Pulse information) and 2nd and 3rd channels are used to measure the direction of signal incidence, AOA (Angle Of Arrival), along with the Max channel signal. Set the window by a certain sample to obtain the sum, measure it, and select the Max, the second, and the third sum as 2nd and 3rd channels for the largest sum of the samples for each channel, and select the desired three channels on the switch. In this case, a delay may be provided between the switch and the analog-to-digital converter (ADC) to perform channel selection in consideration of delay time according to power measurement.

In step (c), the high-resolution TOA measurement unit 300 collects the signals into the buffer for the Max channel and separates the IQ signals by the IQ separation unit having the filter to capture the presence of the signal. Alternatively, the TOA (Time of Arrival) may be measured using external high-precision time information.

The step (f) is performed by the PDW generator 600 by using information such as high resolution TOA (Time of Arrival, arrival time of pulse), AOA (Angle Of Arrival, arrival direction), frequency, and pulse width. PDW (Pulse Description Word, pulse information) is generated.

2 is a Max channel, 2nd, 3rd channel selector using the power of the signal

As shown in FIG. 2, the power measurement and channel selector 200 selects Max, 2nd, and 3rd channels as the magnitude of the signal in the digitized N channels. The Max channel is used to measure Pulse Description Word (PDW) including TOA, and the 2nd and 3rd channels are used to measure the direction of incidence of the signal along with the Max channel signal, that is, the angle of arrival (AOA). . The signal strength of each channel is measured by setting the sum of the samples digitized by the power measurement and comparison selection unit 220 by setting a window as a constant sample. Max, the second, and the third sum are designated as the 2nd and 3rd channels with the largest sum of the samples for each channel, and the switch selects these desired three channels and proceeds to the next step (230). At this time, by placing a delay 210 between the switch (SW) 230 and the analog-to-digital converter (ADC), the channel selection is performed in consideration of the delay time according to the power measurement.

3 is a high resolution TOA measurement unit.

The high resolution TOA measuring unit 300 in FIG. 3 collects the signals into the buffer 310 for the Max channel and obtains the IQ signal of the signal by the IQ separation unit 320 having a filter. The TOA measurer 340 determines the sum of the squares of the respective IQs and determines the start time of the desired signal when the threshold is equal to or greater than a predetermined threshold. At this time, TOA (Time of Arrival) is measured by using a highly stable internal or external high precision oscillator (such as rubidium or cesium).

The channelizer / phase detector 400 obtains the frequency, pulse width, and signal strength of the signal using a channelizer filter, and measures the phase of the signal with the phase detector.

The AOA measuring unit 500 measures AOA (Angle Of Arrival) by using the phase and signal strength of a signal corresponding to the same frequency for each channel at the same time.

The PDW generator 600 outputs TOA information output from the high resolution TOA measurement unit 300 in pulse units, and a frequency and a signal measured by the channelizer / phase detector 400 and the AOA measurement unit 500. By combining information such as intensity, pulse width, AOA, etc., PDW (Pulse Description Word, pulse information) of a specified type is generated, stored for a predetermined time or number, and then output to an external interlocking device.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken in conjunction with the present invention. The present invention can be variously modified or modified.

100: ADC 200: Power and Channel Selector
300: high resolution TOA measurement unit 400: channelizer / phase detector
500: AOA measurement unit 600: PDW generation unit

Claims (3)

In a multi-channel digital receiver,
An AD converter (ADC) for converting N or more RF signals (N is a natural number of 4 or more) received from a plurality of antennas into digital signals by A / D conversion;
After receiving a multi-channel digital signal from N channels from the AD converter (ADC) and measuring the power of the signal for each channel, the received signal having the largest intensity of the received signal using the information and the second (Max channel) A power measurement and channel selection unit for selecting a reception channel of a third channel (left and right channels of the Max channel);
Time of Arrival (TOA) having a resolution of several ns for a signal having the largest intensity of a received signal using internal or external high-precision time information in the signal of the Max channel selected by the power measurement and channel selector. High resolution TOA measuring unit for measuring;
A channelizer / phase detector for measuring the frequency, signal strength, and pulse width of a signal using a channelizer filter on the Max, 2nd, and 3rd channels selected by the power measurement and channel selector, and measuring the phase of the signal. (Signal measurer, channelizer / phaser detector);
An AOA measurement unit for measuring AOA (Angle Of Arrival) by simultaneously using the strength and phase of a signal corresponding to the same frequency for each channel provided from the channelizer / phase detector; And
The high resolution TOA measuring unit, the channelizer / phase detector (signal measurer, channelizer / phaser detector) and the AOA measuring unit combine the results of the pulse description word (PDW) in pulse units. PDW generating unit for generating and storing a predetermined time or the number and output to the external interlocking device;
Multi-channel digital receiving device comprising a. The method of claim 1,
The power measurement and channel selector,
Max, 2nd, and 3rd channels are selected as the signal size in N digitized channels. Max channel is used for PDW (Pulse Description Word, Pulse Information) measurement including TOA, and 2nd and 3rd channels are with Max channel signal. It is used to measure the direction of signal incidence, ie AOA (Angle Of Arrival), and the measurement of the signal strength for each channel is made by measuring the sum of the digitized samples by setting a window for a certain sample, Select the largest sum, the second, and the third sum as 2nd and 3rd channels, selecting for these three channels on the switch, with the delay between the switch (SW) and the analog-to-digital converter (ADC). A multi-channel digital receiving apparatus comprising a delay to perform a channel selection in consideration of the delay time according to the power (power) measurement. The method of claim 1,
The high resolution TOA measurement unit,
Time of Arrival (TOA) pulse using internal or external high-precision visual information at the time when the signal is captured by separating the IQ signal by the IQ separator having a filter by collecting the signal into the buffer for the Max channel. Multi-channel digital receiving device, characterized in that for measuring) the (arrival time of).

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