KR101568239B1 - Apparatus and method for processing signal for millimeter wave seeker - Google Patents

Abstract

The present invention relates to a signal processing apparatus and method for a millimeter wave searcher, and a signal processing apparatus for a searcher according to an embodiment of the present invention includes an analog-to-digital A conversion unit; A first signal processing unit for moving the converted digital signal to a first digital signal of a predetermined intermediate frequency band and changing the shifted first digital signal from a time domain to a frequency domain to generate a complex signal; Wherein the analog-to-digital conversion unit generates a timing signal in consideration of a delay time generated when an analog received signal is changed to a digital signal, modulates the converted digital signal according to the generated timing signal, A second signal processing unit for shifting the shifted second digital signal from a time domain to a frequency domain to generate a digital range signal; And a detection processing unit for calculating a distance to the target using the generated complex number signal and the generated digital range signal and controlling a pulse repetition frequency (PRF) for avoiding radar eclipse phenomenon do.

Description

TECHNICAL FIELD [0001] The present invention relates to a signal processing apparatus and method for a millimeter-

The present invention relates to a signal processing apparatus and method for a millimeter wave searcher, and more particularly, to a millimeter wave searcher for generating a digital range signal for distance measurement in a millimeter wave searcher, To a signal processing apparatus and method for a millimeter-wave searcher.

A searcher such as a radar is a device that obtains information about the position of an object by determining the azimuth and distance of the target object using the reflection and scattering characteristics of the radio wave. That is, the radar sends the radio wave to the target, receives the reflected wave of the radio wave energy, and measures the position of the target by the roundtrip time and the directivity characteristic of the antenna using the directivity and the fixed property of the radio wave.

Conventional searchers use the Ku band with a frequency of 12 to 14 GHz or the Ka band with a frequency of 27 to 40 GHz to operate a searcher. However, navigation systems for guided weapons are required to be smaller in size and capable of high resolution target identification. For such high resolution, it is required to develop a searcher for the W band (75 to 110 GHz), which is a high frequency band. The W-band signal is a millimeter wave having a wavelength of 3 to 5 mm, which is very short in wavelength, which is advantageous for high resolution.

A receiver of a searcher using a conventional W-band signal receives a receive signal, which is an analog signal, and combines it with a local signal generated by a local oscillator to down-convert the signal into a signal having a frequency of several tens MHz. The receiver of the searcher then filters and amplifies the down-converted received signal. Then, the receiver of the searcher converts the filtered and amplified received signal into a digital signal and transmits the digital signal to the signal processor to analyze the digital signal to detect the target.

1 is a block diagram of a receiver of a conventional searcher using a W-band signal.

Referring to FIG. 1, in a conventional searcher, a receiver includes a very high frequency receiver 10, an intermediate frequency receiver 20, an AD converter (ADC), and a signal processor 30.

The microwave receiver 10 receives an analog reception signal of a W band which is a very high frequency signal received through at least one reception antenna and receives an analog reception signal of a first frequency band generated by a first local oscillator (not shown) Converts it to a signal of a predetermined intermediate frequency band, and transmits the down-converted signal to the intermediate frequency receiver 20.

The intermediate frequency receiver 20 receives the down-converted received signal as a signal of the intermediate frequency band and combines it with a second local signal generated by a second local oscillator (IF local oscillator) to generate a baseband frequency Into a received signal. The intermediate frequency receiver 20 transmits the converted baseband received signal to an AD converter (ADC), and the AD converter (ADC) converts the baseband received signal into a digital signal and transmits the digital signal to the signal processor 30.

The signal processing unit 30 receives a signal obtained by modulating an analog signal of a specific channel from the intermediate frequency receiving unit 20 through an AD converter (ADC) and two original signals. The signal processing unit 30 analyzes the received signal converted into the digital signal to determine the position of the target. In the W-band searcher, a receiver includes a very high frequency receiver 10 and an intermediate frequency receiver 20, and uses a heterodyne method for down-converting the received signal twice. That is, a very high frequency signal such as a W- Frequency baseband signals, various problems such as frequency interference and oscillation occur, and it is difficult to obtain selectivity and circuit stability for the received signals.

The receiver of the W-band searcher uses the range signal to avoid the distance measurement of the target and the radar eclipse phenomenon. A receiver generates a range signal using a signal of a specific channel in an intermediate frequency receiver. The receiver of the searcher generates the range signal using the analog signal of the specific channel received by the intermediate frequency receiver and the specific timing signal provided by the signal processor. Here, the specific timing signal means a signal synchronized with a gate signal necessary for operating the searcher.

These explorers are subject to a lot of spatial restrictions in order to apply them to various operating environments. Particularly, when the analog intermediate frequency receiver is replaced with a digital intermediate frequency (IF) receiver or the signal channel processed by the intermediate frequency receiver increases, the size of the searcher also increases proportionally.

Here, a separate space is required for modulating the signal and transmitting the modulated signal to the signal processor. For this reason, it is difficult to limit the spatial limit and the miniaturization of the intermediate frequency receiver 20.

On the other hand, the conventional searcher is disadvantageous in that it is vulnerable to noise and spur until the analog signal is modulated by the receiver and then transmitted to the signal processor. In addition, the conventional seeker requires a separate receiving module for generating the range signal when designing a digital intermediate frequency (IF) receiver that replaces the intermediate frequency receiver.

Korean Registered Patent No. 10-0947215 (Registered on March 5, 2010)

The embodiments of the present invention generate a digital range signal for distance measurement and avoidance of eclipse in a searcher in consideration of a delay time generated in the process of converting an analog-digital signal, and use the generated digital range signal A signal processing apparatus and method for a millimeter-wave searcher capable of detecting a distance from a target and continuously tracking the target without missing the target.

According to a first aspect of the present invention, there is provided an antenna apparatus comprising: an analog-to-digital converter for converting an analog received signal received through at least one reception antenna into a digital signal; A first signal processing unit for moving the converted digital signal to a first digital signal of a predetermined intermediate frequency band and changing the shifted first digital signal from a time domain to a frequency domain to generate a complex signal; Wherein the analog-to-digital conversion unit generates a timing signal in consideration of a delay time generated when an analog received signal is changed to a digital signal, modulates the converted digital signal according to the generated timing signal, A second signal processing unit for shifting the shifted second digital signal from a time domain to a frequency domain to generate a digital range signal; And a detection processing unit for calculating a distance to the target using the generated complex number signal and the generated digital range signal and controlling a pulse repetition frequency (PRF) for avoiding radar eclipse phenomenon A signal processing apparatus for a searcher may be provided.

Wherein the first signal processor comprises: a first down-converter for shifting the converted digital signal to a first digital signal of a predetermined intermediate frequency band; And a first digital signal processor for generating a complex signal by changing the moved first digital signal from a time domain to a frequency domain.

Wherein the second signal processing unit comprises: a timing signal generator for generating a timing signal delayed by a delay time generated when the analog reception signal is changed to a digital signal in the analog-digital converter; A modulator for modulating the converted digital signal according to the generated timing signal; A second down converter for shifting the modulated digital signal to a second digital signal of a predetermined intermediate frequency band; And a second digital signal processor for converting the shifted second digital signal from a time domain to a frequency domain to generate a digital range signal.

The timing signal generator may generate a timing signal at a time point that is a center of a received signal in a reception interval for tracking the target, by delaying the delay signal by a delay time generated when an analog signal is changed to a digital signal.

The timing signal generator may generate a timing signal based on a pulse repetition frequency (PRF) for operating a millimeter wave searcher.

The second digital signal processor may convert the fixed-point data of the moved second digital signal into a predetermined bit of floating-point data to generate a digital range signal.

According to a second aspect of the present invention, there is provided a method of converting an analog received signal received through at least one reception antenna into a digital signal; Moving the converted digital signal to a first digital signal of a predetermined intermediate frequency band and changing the shifted first digital signal from a time domain to a frequency domain to generate a complex signal; Wherein the analog-to-digital conversion unit generates a timing signal in consideration of a delay time generated when an analog received signal is changed to a digital signal, modulates the converted digital signal according to the generated timing signal, To a second digital signal of a predetermined intermediate frequency band, and changing the shifted second digital signal from a time domain to a frequency domain to generate a digital range signal; And controlling a pulse repetition frequency (PRF) for avoiding radar eclipse by calculating a distance to the target using the generated complex number signal and the generated digital range signal A signal processing method for a searcher can be provided.

Wherein the generating the complex number signal comprises: moving the transformed digital signal to a digital signal of a predetermined intermediate frequency band; And generating a complex signal by changing the moved first digital signal from a time domain to a frequency domain.

Generating the digital range signal includes generating a timing signal delayed by a delay time generated when the analog receive signal is changed to a digital signal in the analog-digital converter; Modulating the converted digital signal according to the generated timing signal; Moving the modulated digital signal to a second digital signal of a predetermined intermediate frequency band; And changing the moved second digital signal from the time domain to the frequency domain to generate a digital range signal.

The step of generating the timing signal may generate a timing signal at a time point that is delayed by a delay time occurring when the analog signal is changed to a digital signal, but is a center of the received signal in a reception interval for tracking the target.

The step of generating the timing signal may generate a timing signal based on a pulse repetition frequency (PRF) operating the millimeter wave searcher.

The step of generating the digital range signal may convert the fixed-point data of the moved second digital signal into a predetermined-bit floating-point data to generate a digital range signal.

The embodiments of the present invention generate a digital range signal for distance measurement and avoidance of radar eclipse in a millimeter-wave searcher in consideration of a delay time generated in the process of converting an analog-digital signal and output the generated digital range signal It is possible to detect the distance to the target and to keep track of the target without missing.

Embodiments of the present invention can generate a digital range signal and detect a distance to a target from an intermediate frequency receiver using a conventional analog signal, thereby being robust against signal noise and spur.

Embodiments of the present disclosure can contribute to further miniaturization of the searcher by implementing a searcher without spatial constraints due to the channel increase of the intermediate frequency receiver.

1 is a block diagram of a receiver of a conventional searcher using a W-band signal.
2 is a block diagram of a signal processing apparatus for a millimeter wave searcher according to an embodiment of the present invention.
3 is an explanatory diagram of a timing signal according to an embodiment of the present invention.
4 is a flowchart of a signal processing method for a millimeter wave searcher according to an embodiment of the present invention.

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

In describing the embodiments, descriptions of techniques which are well known in the technical field to which this specification belongs and which are not directly related to this specification are not described. This is for the sake of clarity without omitting the unnecessary explanation and without giving the gist of the present invention.

For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated. Also, the size of each component does not entirely reflect the actual size. In the drawings, the same or corresponding components are denoted by the same reference numerals.

2 is a block diagram of a signal processing apparatus for a millimeter wave searcher according to an embodiment of the present invention.

2, the signal processing apparatus 200 for a millimeter wave searcher according to an embodiment of the present invention includes an analog-to-digital conversion unit 210, a first signal processing unit 220, a second signal processing unit 230 And a detection processing unit 240.

The specific configuration and operation of each component of the millimeter wave seeker signal processing device 200 of FIG. 2 will be described below.

An analog-to-digital converter (ADC) 210 converts an analog received signal received through at least one reception antenna into a digital signal through analog-to-digital conversion. The analog-to-digital converter 210 binarizes a radio frequency (RF) signal input to the signal processor 200 of the millimeter wave searcher and outputs the binarized signal to the first signal processor 220 and the second signal processor 230 . Here, the analog-to-digital converter 210 may include a plurality of ADCs corresponding to a plurality of channels.

The first signal processing unit 220 moves the digital signal converted by the analog-to-digital converter (ADC) 210 to a first digital signal of a predetermined intermediate frequency band, and outputs the shifted first digital signal to a time domain To the frequency domain to generate a complex number signal. Here, the first signal processor 220 may change the first digital signal from a time domain to a frequency domain through Fast Fourier Transform (FFT). The first signal processing unit 220 may convert the data format of the first digital signal. This is for converting the data received from the first signal processing unit 220 to the detection processing unit 240 so that it can be processed immediately. For example, the first signal processing unit 220 may convert 16-bit fixed-point data into 32-bit floating-point data and transmit the data to the detection processing unit 240.

The second signal processing unit 230 generates a timing signal in consideration of the delay time generated when the analog receive signal is changed to a digital signal in the analog-digital conversion unit 210, and outputs the analog- Digital conversion unit 210 modulates the converted digital signal. That is, the second signal processor 230 modulates the digital signal according to a timing signal generated by delaying the RF signal and the delay time.

Thereafter, the second signal processor 230 moves the modulated digital signal to a second digital signal of a predetermined intermediate frequency band, and changes the second digital signal that has been moved from the time domain to the frequency domain to generate a digital range signal do. That is, the digital range signal is generated based on the timing signal generated by delaying by the delay time. The digital range signal thus generated can be more robust against noise and spur than that generated by a conventional intermediate frequency receiver. Therefore, a separate digital intermediate frequency module for generating a digital range signal in the signal processing apparatus 200 is not required.

Meanwhile, the first and second signal processors 220 and 230 may be implemented as a field programmable gate array (FPGA). The first and second signal processing units 220 and 230 may process the binarized signal. The first and second signal processing units 220 and 230 may be implemented as a field programmable gate array (FPGA) capable of receiving binary data in the analog-digital conversion unit 210. Also, the first and second signal processing units 220 and 230 may be implemented as a field programmable gate array (FPGA) as a result of a digital circuit, so that the first and second signal processing units 220 and 230 can be easily changed according to the characteristics of a searcher used.

The detection processing unit 240 calculates a distance between the complex signal generated by the first signal processing unit 220 and the digital range signal generated by the second signal processing unit 230 and a target object (e.g., a target). In addition, the detection processing unit 240 controls a pulse repetition frequency (PRF) for avoiding a radar eclipse phenomenon by using a digital range signal.

The first signal processing unit 220 according to the embodiment of the present invention may include a first down converter 221 and a first digital signal processing unit 222. The specific configuration and operation of each component of the first signal processing unit 220 will be described below.

A first down-converter (DDC) 221 moves the digital signal converted by the analog-to-digital converter (ADC) 210 to a first digital signal of a predetermined intermediate frequency band. The first down converter 221 can move the binary radio frequency (RF) signal input to the first signal processor 220 to a desired frequency and generate a complex number signal. The first down converter 221 can reduce the reception data rate of the first digital signal by dividing the frequency of the digital signal by 1 / n, that is, dividing the signal so that the signal processing apparatus 200 can process in real time.

The first digital signal processor 222 generates a complex signal by changing the first digital signal transmitted from the first down converter 221 from a time domain to a frequency domain.

The second signal processor 230 according to the embodiment of the present invention includes a timing signal generator 234, a modulator 231, a second downconverter 232 and a second digital signal processor 233. The specific configuration and operation of each component of the second signal processor 230 will be described below.

The timing signal generator 234 generates a timing signal delayed by a delay time generated when the analog reception signal is changed to a digital signal by the analog-digital converter 210. [ The conventional timing signal used in the conventional intermediate frequency receiver can not be used in the second signal processing unit 230 as it is. The second signal processing unit 230 must modulate at the center of the received signal so that the signal processing apparatus 200 can accurately track the signal and calculate the distance of the target object. However, since the conventional timing signal undergoes the analog-to-digital conversion process in the analog-to-digital conversion unit 210, the conventional timing signal is delayed by the conversion time. Therefore, the timing signal generator 234 delays the timing signal by reflecting the delay time generated after changing the analog signal into the digital signal, and transmits the generated timing signal to the modulator 231. [

That is, the timing signal generator 234 can generate a timing signal at each time when it is the center of the received signal in the reception interval for tracking the target object, by delaying the delay time by the delay time generated when the analog signal is changed to the digital signal . Here, the timing signal generator 234 may generate a timing signal based on a pulse repetition frequency (PRF) for operating the millimeter wave searcher.

The modulator 231 modulates the digital signal converted by the analog-to-digital converter (ADC) 210 according to the timing signal generated by the timing signal generator 234. The modulator 231 modulates the digital signal of the specific channel received through the analog-digital converter 210 into a signal for measuring the distance. Here, the modulator 231 may modulate the digital signal based on the timing signal generated based on the pulse repetition frequency (PRF) for operating the signal processor 200 of the millimeter wave searcher.

Then, the second down converter 232 shifts the digital signal modulated by the modulator 231 to a second digital signal of a predetermined intermediate frequency band. The second down converter 232 can move the binary radio frequency (RF) signal input to the second signal processing unit 230 to a desired frequency and generate a complex number signal. The second down-converter 232 can lower the reception data rate of the second digital signal by dividing the frequency of the digital signal by 1 / n, that is, by dividing the signal so that the signal can be processed in real time in the signal processing apparatus 200.

The second digital signal processor 233 changes the second digital signal transmitted from the second down converter 232 from a time domain to a frequency domain to generate a digital range signal. Here, the second digital signal processor 233 may convert the fixed-point data of the second digital signal transmitted from the second down-converter 232 to a predetermined bit of floating-point data to generate a digital range signal. For example, the second digital signal processor 233 may convert 16-bit fixed-point data into 32-bit floating-point data to generate a digital range signal.

3 is an explanatory diagram of a timing signal according to an embodiment of the present invention.

The timing signal generation process according to the conventional and one embodiment of the present specification is shown in FIGS. 3A and 3B, respectively.

The timing signal used in the conventional intermediate frequency (IF) receiver is generated as shown in Fig. 3 (a). A conventional timing signal is generated in correspondence with a reception section in which a transmission signal transmitted in a transmission section is reflected on a target object and received. At this time, a timing signal is generated every time the center of the reception signal of the reception section becomes the center.

However, the signal processing apparatus 200 according to the embodiment of the present invention can not use the timing signal used in the conventional IF receiver shown in FIG. 3 (a) as it is. Such a conventional timing signal does not reflect the delay time? T generated when an analog signal is converted into a digital signal.

Meanwhile, the timing generator according to the embodiment of the present invention generates a timing signal as shown in FIG. 3 (b). That is, the timing generation unit generates a timing signal by reflecting the delay time? T generated when converting the analog signal into the digital signal, and transmits the generated timing signal to the modulation unit 231. Here, the delay time? T means a delay time that occurs before signal modulation while converting an analog signal into a digital signal. That is, when the reception section for tracking the target is determined, the timing generation section can calculate the delay time? T in the reception section to generate the timing signal that becomes the center of the reception signal.

Subsequently, the modulation section 231 can modulate the digital signal at the center of the reception signal of the reception section in accordance with the timing signal thus generated. Therefore, the signal processing apparatus 200 can track the signal using the digital signal modulated at the center of the received signal, and calculate the distance to the target using the tracked signal.

4 is a flowchart of a signal processing method for a millimeter wave searcher according to an embodiment of the present invention.

The analog-to-digital conversion unit 210 converts an analog received signal received through at least one reception antenna into a digital signal (S402).

The first signal processing unit 220 moves the digital signal converted by the analog-digital conversion unit 210 to a first digital signal of a predetermined intermediate frequency band (S404).

Subsequently, the first signal processor 220 converts the moved first digital signal from the time domain to the frequency domain to generate a complex signal (S406).

Meanwhile, the second signal processing unit 230 generates a timing signal delayed by a delay time generated when the analog-to-digital conversion unit 210 changes the analog received signal to a digital signal (S408). Here, the second signal processing unit 230 may generate a timing signal at a time point that is the center of the received signal in the reception interval for tracking the target object, by delaying the delay time by the delay time generated when the analog signal is changed to the digital signal . At this time, the second signal processor 230 may generate a timing signal based on a pulse repetition frequency (PRF) for operating the millimeter wave searcher.

The second signal processor 230 modulates the digital signal according to the generated timing signal (S410).

Subsequently, the second signal processor 230 moves the modulated digital signal to a second digital signal of a predetermined intermediate frequency band (S412).

The second signal processor 230 generates a digital range signal by changing the moved second digital signal from the time domain to the frequency domain (S414).

On the other hand, the detection processing unit 240 calculates the distance to the target, that is, the target object, using the complex number signal generated in the first signal processing unit 220 and the digital range signal generated in the second signal processing unit 230 (S416 ). Here, the detection processing unit 240 controls a pulse repetition frequency (PRF) for avoiding radar eclipse using a digital range signal.

It will be understood by those skilled in the art that the present specification may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present specification is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents are included in the scope of the present specification Should be interpreted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is not intended to limit the scope of the specification. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

200: signal processing device
210: analog-to-digital conversion section
220: first signal processor
221: First down converter
222: a first digital signal processor
230: second signal processor
231:
232: second down converter
233: Second digital signal processor
234: Timing signal generator
240:

Claims (12)

An analog-to-digital converter for converting an analog reception signal received through at least one reception antenna into a digital signal;
A first signal processing unit for moving the converted digital signal to a first digital signal of a predetermined intermediate frequency band and changing the shifted first digital signal from a time domain to a frequency domain to generate a complex signal;
Wherein the analog-to-digital conversion unit generates a timing signal in consideration of a delay time generated when an analog received signal is changed to a digital signal, modulates the converted digital signal according to the generated timing signal, A second signal processing unit for shifting the shifted second digital signal from a time domain to a frequency domain to generate a digital range signal; And
A detection processing unit for calculating a distance to the target using the generated complex number signal and the generated digital range signal and controlling a pulse repetition frequency (PRF) for avoiding radar eclipse,
And a signal processing unit for searching the signal processing apparatus. The method according to claim 1,
The first signal processor
A first down-converter for shifting the converted digital signal into a first digital signal of a predetermined intermediate frequency band; And
A first digital signal processor for generating a complex signal by changing the shifted first digital signal from a time domain to a frequency domain,
And a signal processing unit for searching the signal processing apparatus. The method according to claim 1,
The second signal processor
A timing signal generator for generating a timing signal delayed by a delay time generated when the analog reception signal is changed to a digital signal in the analog-digital converter;
A modulator for modulating the converted digital signal according to the generated timing signal;
A second down converter for shifting the modulated digital signal to a second digital signal of a predetermined intermediate frequency band; And
A second digital signal processor for generating a digital range signal by changing the shifted second digital signal from a time domain to a frequency domain,
And a signal processing unit for searching the signal processing apparatus. The method of claim 3,
The timing signal generator
And generates a timing signal at a time point that is delayed by a delay time generated when an analog signal is changed to a digital signal but is a center of a received signal in a reception interval for tracking the target. The method of claim 3,
The timing signal generator
A signal processor for a seeker that generates a timing signal based on a pulse repetition frequency (PRF) operating a millimeter wave searcher. The method of claim 3,
The second digital signal processor
And converting the fixed-point data of the moved second digital signal into floating-point data of predetermined bits to generate a digital range signal. Converting an analog received signal received via at least one receive antenna into a digital signal;
Moving the converted digital signal to a first digital signal of a predetermined intermediate frequency band and changing the shifted first digital signal from a time domain to a frequency domain to generate a complex signal;
Generating a timing signal in consideration of a delay time generated when the analog receive signal is changed to a digital signal, modulating the converted digital signal according to the generated timing signal, and outputting the modulated digital signal to a predetermined intermediate frequency band Shifting the shifted second digital signal from the time domain to the frequency domain to generate a digital range signal; And
Calculating a distance to the target using the generated complex number signal and the generated digital range signal, and controlling a pulse repetition frequency (PRF) for avoiding radar eclipse
And a signal processing method for a searcher. 8. The method of claim 7,
The step of generating the complex number signal
Moving the converted digital signal to a digital signal of a predetermined intermediate frequency band; And
Generating a complex signal by changing the shifted first digital signal from a time domain to a frequency domain;
And a signal processing method for a searcher. 8. The method of claim 7,
The step of generating the digital range signal
Generating a timing signal delayed by a delay time generated when the analog received signal is changed to a digital signal;
Modulating the converted digital signal according to the generated timing signal;
Moving the modulated digital signal to a second digital signal of a predetermined intermediate frequency band; And
Generating a digital range signal by changing the shifted second digital signal from a time domain to a frequency domain
And a signal processing method for a searcher. 10. The method of claim 9,
The step of generating the timing signal
Generating a timing signal at a time point that is delayed by a delay time occurring when an analog signal is changed to a digital signal but is a center of a received signal in a reception interval for tracking the target. 10. The method of claim 9,
The step of generating the timing signal
A signal processing method for a seeker that generates a timing signal based on a pulse repetition frequency (PRF) operating a millimeter wave searcher. 10. The method of claim 9,
The step of generating the digital range signal
And converting the fixed-point data of the moved second digital signal into floating-point data of predetermined bits to generate a digital range signal.

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