KR102538624B1 - Method of measuring phase difference for frequency measurement and interferometer direction finding and wideband digital receiver including the same - Google Patents

Abstract

The wideband digital receiver divides the reception band of the wideband into M narrowband channels and outputs baseband I/Q signals for each divided narrowband. A signal measuring unit for measuring , a signal detecting unit for outputting a measurement start signal and a measurement end signal by comparing the signal level with a set threshold, and a phase difference for frequency receiving the measured phase from the signal measuring unit and outputting an average of the phase difference. Measuring unit, a frequency calculating unit that calculates a frequency using the average phase difference received from the phase difference measuring unit for frequency, and phase difference measurement for direction finding that receives the measured phase of the same narrowband channel from the signal measuring unit and outputs an average phase difference. and a direction detection unit that calculates a direction using the average phase difference received from the direction detection phase difference measurement unit.

Description

Phase difference measurement method for frequency measurement and interferometer direction finding and broadband digital receiver including the same

The present invention relates to a phase difference measurement method for frequency measurement and interferometer direction finding, and a wideband digital receiver including the same.

In a digital receiver that receives pulses and continuous waves (CW) and measures the specifications of a received signal, the phase difference between successive samples and the phase difference between paths for the received signal is used to measure the frequency of the received signal and detect its direction. It is an essential element.

Frequency measurement using the phase difference between successive samples of the digitally converted received signal can be expressed as Equation 1 below.

In addition, interferometer direction detection (azimuth and elevation) using the phase difference between paths of signals received through multiple paths simultaneously from multiple antennas can be expressed as in Equation 2 below.

Since the sampling frequency in Equation 1 and the distance D between the antennas in Equation 2 are determined values, frequency measurement and direction finding (azimuth and elevation) accuracy depends on the accuracy of the phase difference measured by the digital receiver.

The digital receiver receives and processes signals input within the receiving bandwidth of the intermediate frequency (IF) determined at the time of design. Since the IF signal is the output of the RF receiver and includes the thermal noise of the reception band generated by the antenna and RF receiver and the noise figure (NF) in the receiving path, the signal to noise ratio (Signal to Noise Ratio, which includes noise in the original signal) SNR) condition is input to the digital receiver. This IF signal is converted into a digital signal by the analog-to-digital converter of the digital receiver. During conversion, quantization noise is added and down-converted to baseband to be output as an I/Q signal. This I/Q signal is used to measure the phase of the received signal, and CORDIC (Co-ordinate Rotation Digital Computer) is used for phase measurement. During measurement, the phase measurement error is added to output the final phase, and the final phase is output. The phase difference between successive samples and the phase difference between paths are measured using . As such, the measured phase difference between samples and the phase difference between paths includes noise generated in the process of measuring the phase difference. Therefore, a method for accurately measuring the phase difference must be considered essential.

A technical problem to be solved by the present invention is to provide a method for measuring a phase difference for measuring a frequency of a received signal and detecting an interferometer direction, and a wideband digital receiver including the same.

A wideband digital receiver according to an embodiment of the present invention divides a wideband reception band into M narrowband channels and outputs a baseband I/Q signal for each divided narrowband. A signal measurement unit that receives a signal and measures the phase and signal level, a signal detection unit that compares the signal level with a set threshold and outputs a measurement start signal and a measurement end signal, and receives the measured phase from the signal measurement unit A phase difference measurement unit for frequency that outputs an average phase difference, a frequency operation unit that calculates a frequency using the phase difference average received from the phase difference measurement unit for frequency, and a phase difference average obtained by receiving the measured phase of the same narrowband channel from the signal measurement unit. and a direction detection unit that calculates a direction using the average phase difference received from the direction detection phase difference measurement unit and outputs .

The N polyphase filter bank units correspond to N paths, and each of the N polyphase filter bank units divides the wideband reception band into M narrowband channels, and baseband I/Q signals for each divided narrowband can output

The signal measurement units are composed of N×M signal units in a 1:1 correspondence with the M narrowband channels of the N paths, and each of the N×M signal measurement units receives I/Q signals and measures phases and signal amplitudes. can

The signal detection unit is composed of M corresponding to the M signal measurement units in one path among the N paths, and each of the M signal detection units compares the signal level with a set threshold to measure a start signal and a measurement end signal. can output

The frequency phase difference measuring unit is composed of M corresponding to the M signal detectors in one of the N paths, and each of the M frequency phase difference measuring units receives the measured phase from the signal measuring unit and averages the phase difference. can output

The phase difference measurement units for direction finding are composed of M equal to the number of the M narrowband channels, and each of the M phase difference measurement units for direction finding receives the measured phases of the same narrowband channels corresponding to the N paths and determines the phase difference. Averages can be output.

Each of the M phase difference measuring units for direction finding may receive a phase within the range of -180 degrees to 180 degrees from the signal measuring unit, perform a phase difference operation with the phase of each path, and then perform a process of converting 0 degrees to 360 degrees. there is.

The phase difference measurement unit for frequency receives a phase within the range of -180 degrees to 180 degrees from the signal measurement unit, a phase difference calculation block that calculates a phase difference by delaying one sample, and the first phase difference at the input time of the measurement start signal as a phase difference reference value A phase difference conversion block that determines a phase difference conversion reference value according to the phase difference reference value and the effective range reference value, maintains or converts the measured phase difference by the phase difference conversion reference value, and outputs the final phase difference, and to the reception of the measurement start signal. According to this, an average block may be configured to reset the final phase difference, perform an average operation until the measurement end signal is received, and output an average phase difference.

In a phase difference measurement method for frequency measurement and interferometer direction finding according to another embodiment of the present invention, a polyphase filter bank unit divides a wideband reception band into M narrowband channels, and the I of the baseband for each divided narrowband Outputting a /Q signal, receiving the I/Q signal by a signal measurement unit and measuring the phase and signal level, and outputting a measurement start signal and a measurement end signal by comparing the signal level with a set threshold by a signal detection unit. a phase difference measuring unit for frequency receiving the phase measured by the signal measuring unit and outputting a first phase difference average, a frequency calculating unit calculating a frequency using the first phase difference average, phase difference measurement for direction finding An additional step of receiving the measured phase of the same narrowband channel from the signal measuring unit and outputting a second phase difference average, and a direction finding unit calculating a direction using the second phase difference average.

The N polyphase filter bank units correspond to N paths, and each of the N polyphase filter bank units divides the wideband reception band into M narrowband channels, and baseband I/Q signals for each divided narrowband can output

The signal measurement units are composed of N×M signal units in a 1:1 correspondence with the M narrowband channels of the N paths, and each of the N×M signal measurement units receives I/Q signals and measures phases and signal amplitudes. can

The signal detection unit is composed of M corresponding to the M signal measurement units in one path among the N paths, and each of the M signal detection units compares the signal level with a set threshold to measure a start signal and a measurement end signal. can output

The frequency phase difference measuring unit is composed of M corresponding to the M signal detectors in one of the N paths, and each of the M frequency phase difference measuring units receives the measured phase from the signal measuring unit and averages the phase difference. can output

The phase difference measurement units for direction finding are composed of M equal to the number of the M narrowband channels, and each of the M phase difference measurement units for direction finding receives the measured phases of the same narrowband channels corresponding to the N paths and determines the phase difference. Averages can be output.

Each of the M phase difference measuring units for direction finding may receive a phase within the range of -180 degrees to 180 degrees from the signal measuring unit, perform a phase difference operation with the phase of each path, and then perform a process of converting 0 degrees to 360 degrees. there is.

The phase difference measurement unit for frequency receives a phase within the range of -180 degrees to 180 degrees from the signal measurement unit, calculates the phase difference by delaying one sample, and sets the first phase difference as a phase difference reference value at the input time of the measurement start signal, A phase difference conversion reference value is determined according to the phase difference reference value and the effective range reference value, the final phase difference is output by maintaining or converting the measured phase difference by the phase difference conversion reference value, and the final phase difference is reset according to the reception of the measurement start signal , It is possible to output an average phase difference by performing an average operation until the reception point of the measurement end signal.

Embodiments of the present invention suggest that a higher sampling frequency than Nyquist sampling is required in order to reduce ambiguity of phase difference measurement in phase difference measurement for frequency measurement. In addition, in measuring the phase difference of the received signal, noise can be reduced through phase difference conversion and averaging, thereby increasing phase difference measurement accuracy. In addition, frequency measurement accuracy and direction finding accuracy may be increased by increasing phase difference measurement accuracy. In addition, a structure in which the phase difference conversion reference value can be changed according to the phase difference change size of the device is proposed, and the phase difference measurement range is expanded to respond to phase and frequency modulation signals by setting the phase difference conversion reference value small when the phase difference change size of the device is small. It could be easier than this. Therefore, it can help design efficient frequency measurement and direction finding.

1 is a block diagram illustrating a broadband digital receiver according to an embodiment of the present invention.
FIG. 2 is a block diagram illustrating a phase measurement block of the signal measurement unit and a phase difference measurement unit for frequency of FIG. 1 .
3 to 10 are graphs showing a user-set value, a phase difference reference value, a phase difference conversion reference value, and a phase difference measurement range in the frequency phase difference measuring unit of FIG. 2 .
11 is a block diagram illustrating a phase measurement block of the signal measurement unit of FIG. 1 and a phase difference measurement unit for direction detection.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. This invention may be embodied in many different forms and is not limited to the embodiments set forth herein.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

In addition, throughout the specification, when a certain component is said to "include", it means that it may further include other components without excluding other components unless otherwise stated.

Hereinafter, a phase difference measurement method for frequency measurement and interferometer direction finding according to an embodiment of the present invention and a wideband digital receiver including the same will be described with reference to FIGS. 1 to 11.

1 is a block diagram illustrating a broadband digital receiver according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating a phase measurement block of the signal measurement unit and a phase difference measurement unit for frequency of FIG. 1 . 3 to 10 are graphs showing a user-set value, a phase difference reference value, a phase difference conversion reference value, and a phase difference measurement range in the frequency phase difference measuring unit of FIG. 2 . 11 is a block diagram illustrating a phase measurement block of the signal measurement unit of FIG. 1 and a phase difference measurement unit for direction detection.

1 to 11, the wideband digital receiver 100 includes an analog-to-digital conversion unit 110, a polyphase filter bank unit 120, a signal measurement unit 130, a signal detection unit 140, a phase difference for frequency It may include a measurement unit 150, a phase difference measurement unit 160 for direction detection, a frequency operation unit 170, and a direction detection unit 180.

)로 샘플링된 것으로 출력 속도는

이다.The analog-to-digital converter 110 converts an RF signal received through an antenna (not shown) into an IF signal, converts an IF signal output from an RF receiver (not shown) that amplifies, and filters an IF signal into a corresponding digital signal and outputs the converted signal. can do. In the embodiment of the present invention, it is exemplified that N IF signals are input from a plurality (N) of interferometer direction finding antennas. That is, N IF signals are input from the first to Nth interferometer direction finding antennas through paths 1 to N. The analog-to-digital conversion unit 110 is composed of N pieces in 1:1 correspondence to paths #1 to #N, and can simultaneously perform a function of converting N IF signals into digital signals. The digital signal sample, which is an output of the analog-to-digital conversion unit 110, has a sampling frequency (

), and the output rate is

am.

을 데시메이션한 샘플링 주파수(

)로 샘플링된 것으로 다위상 필터 뱅크부(120)의 출력 속도는

이다. 일반적으로 나이퀴스트 샘플링이 되도록

는 저대역 필터의 저지대역 주파수의 2배 이상으로 설계된다. 그러나 본 발명의 실시예에 따른 다위상 필터 뱅크부(120)는 오버샘플링(

)을 수행하며, 다위상 필터 뱅크부(120)의 출력 속도는

이다. The polyphase filter bank unit 120 is composed of N pieces so as to correspond 1:1 to paths 1 to N (N paths), and each polyphase filter bank unit 120 has a plurality of wideband reception bands (M ) of narrowbands, and a baseband I (In-phase)/Q (Quadrature) signal corresponding to each of the divided narrowbands may be output. That is, each of the polyphase filter bank units 120 may output baseband I/Q signals for each of the first to M narrowband channels. Accordingly, each of the polyphase filter bank units 120 may output an I/Q signal through one narrowband channel corresponding to its own frequency within the wideband reception band. A sample of a digital signal output from one narrowband channel is

The sampling frequency decimated (

), and the output speed of the polyphase filter bank unit 120 is

am. In general, Nyquist sampling

is designed to be more than twice the stopband frequency of the lowpass filter. However, the polyphase filter bank unit 120 according to the embodiment of the present invention oversampling (

), and the output speed of the polyphase filter bank unit 120 is

am.

)과 신호크기를 측정할 수 있으며, 이는 수학식 3과 같이 나타낼 수 있다. The signal measurer 130 is composed of N×M signals in a 1:1 correspondence with the first to M narrowband channels (N narrowband channels) of the first to N paths (N paths), and measures each signal. The unit 130 receives the I/Q signal and uses CORDIC to phase (

) and signal magnitude can be measured, which can be expressed as in Equation 3.

The signal amplitude and phase output from the signal measurer 130 may be output at the same speed as that of the polyphase filter bank unit 120 . The signal measurement unit 130 may output the measured signal strength to the signal detection unit 140 and output the measured phase to the phase difference measurement unit 150 for frequency and the phase difference measurement unit 160 for direction detection.

The signal detector 140 may be composed of M signal detectors 130 and M signal detectors 130 in one of paths 1 through N, in a 1:1 correspondence. 1 illustrates that M signal detection units 140 are configured to correspond to the M signal measuring units 130 in a first path. However, the M signal detectors 140 may be selectively configured in a path having the largest reception sensitivity and dynamic range among paths 1 to 10 N.

Each signal detection unit 140 may output a measurement start signal and a measurement end signal by comparing the signal level with a set threshold value. Each of the signal detectors 140 may determine that there is a signal when the signal level is greater than the set threshold value and output a measurement start signal, and then output a measurement end signal when the signal level is smaller than the set threshold value. The measurement start signal and the measurement end signal are output to the M phase difference measurement units 150 for frequency and the M phase difference measurement units 160 for direction finding.

Like the signal detector 140, the phase difference measurer 150 for frequency has M signal detectors 140 (or M signal measurers 130) and 1: It can be composed of M pieces so that it corresponds to 1. In FIG. 1 , it is exemplified that M signal detection units 140 (or M signal measurement units 130) are configured with M frequency phase difference measurement units 150 in path 1.

)을 수신하여 하나의 수신 신호에 대응되는 위상차 평균(예를 들어, 1번 채널의 위상차 평균

)을 주파수 연산부(170)로 출력할 수 있다. 이를 위해, 주파수용 위상차 측정부(150)는 도 2에 나타낸 바와 같이 위상차 연산 블록(151), 위상차 변환 블록(152) 및 평균 블록(153)을 포함할 수 있다. The phase difference measurement unit 150 for each frequency may receive a measurement start signal and a measurement end signal for the received signal from the corresponding signal detection unit 140 of the same channel, and may operate in synchronization therewith. The phase difference measuring unit 150 for each frequency measures the phase measured from the signal measuring unit 130 (for example, the measured phase of channel 1).

) is received and the phase difference average corresponding to one received signal (for example, the phase difference average of channel 1)

) may be output to the frequency calculator 170. To this end, the frequency phase difference measurement unit 150 may include a phase difference calculation block 151, a phase difference conversion block 152, and an average block 153 as shown in FIG.

)를 연산할 수 있다. 위상차 연산 결과가 -360도 내지 360도 범위로 변경되므로, 위상차 연산 블록(151)은 위상차 연산 결과를 다시 -180도 내지 180도 범위로 변환한다. The phase difference calculation block 151 receives a phase within the range of -180 degrees to 180 degrees from the signal measurer 130 and delays one sample to determine the phase difference (

) can be computed. Since the phase difference calculation result is changed to a range of -360 degrees to 360 degrees, the phase difference calculation block 151 converts the phase difference calculation result back to a range of -180 degrees to 180 degrees.

)으로 정하고, 이 위상차 기준값과 이후에 입력되는 위상차와의 차이(

)를 구할 수 있다. 그리고 위상차 변환 블록(152)은 아래의 표 1의 과정(도 2의 위상차 유지 및 변환 블록)을 거쳐 위상차(

)의 값을 유지(

)하거나 변환하여

을 출력할 수 있다. The phase difference conversion block 152 holds the first phase difference at the time of input of the measurement start signal, and converts it to the phase difference reference value of the received signal (

), and the difference between this phase difference reference value and the phase difference input thereafter (

) can be obtained. And the phase difference conversion block 152 goes through the process of Table 1 below (the phase difference maintenance and conversion block in FIG. 2) to change the phase (

) keep the value of (

) or by converting

can output

)는 임의의 위상차 기준값을 기준으로 ±

(유효범위 기준값) 영역에서 연속적인 값을 유지하도록 하여 측정 시작 신호부터 출력되는 위상차 (

)에 대한 평균을 취할 수 있다. 상기의 위상차 기준값과

에 따라 위상차 변환 기준값이 결정되며, 그 값은 아래의 표 2와 같다.The phase difference finally output from the phase difference conversion block 152 (

) is ± based on an arbitrary phase difference reference value

The phase difference output from the measurement start signal by maintaining a continuous value in the (effective range reference value) area (

) can be averaged. The above phase difference reference value and

Depending on, the phase difference conversion reference value is determined, and the value is shown in Table 2 below.

(유효범위 기준값)는 사용자가 설정하는 값으로 위상차 측정의 모호성이 없도록 최대 180도로 설정될 수 있다. 잡음에 의한 위상차 변화의 크기를 알 수 있다면

를 작게 설정하여 위상차 기준값을 기준으로 위상차 기준값 ±

범위 이내로 측정되는 위상차는 유효한 측정값으로 판단하고 범위 밖으로 측정되는 위상차는 위상 및 주파수 변조에 의한 것으로 판단할 수 있다. 이에 따라, 입력 신호의 변조 신호 유무가 측정될 수 있으며,

를 작게 설정할수록 위상차 변화 측정 범위를 넓게 할 수 있다. here,

(Effective range reference value) is a value set by the user and can be set up to 180 degrees so that there is no ambiguity in phase difference measurement. If the size of the phase difference change due to noise can be known

By setting small, the phase difference reference value ±

A phase difference measured within the range can be determined as a valid measurement value, and a phase difference measured outside the range can be determined to be due to phase and frequency modulation. Accordingly, the presence or absence of a modulation signal of the input signal can be measured,

The smaller is set, the wider the phase difference change measurement range can be.

, 위상차 변환 기준값, 위상차 변화 측정 범위에 대하여 도 3 내지 10을 예로 들어 설명한다. The above phase difference reference value,

, the phase difference conversion reference value, and the phase difference change measurement range will be described with reference to FIGS. 3 to 10 as examples.

=180도이고 측정된 위상차 기준값이 40도, 150도, -110도, -50도인 경우,

와 위상차 기준값에 따라 결정된 위상차 변환 기준값이 -140도, -30도, 70도, 130도가 되며, 측정된 위상차(

)가 위상차 변환 기준값에 의해 유지 또는 변환되어 최종 위상차(

)가 됨을 보여준다. 3 to 6 are

=180 degrees and the measured phase difference reference values are 40 degrees, 150 degrees, -110 degrees, -50 degrees,

The phase difference conversion reference values determined according to the phase difference reference values are -140 degrees, -30 degrees, 70 degrees, and 130 degrees, and the measured phase difference (

) is maintained or converted by the phase difference conversion reference value, and the final phase difference (

) shows that

가 180도 경우에는 위상차 기준값에서 위상차 변환 기준값까지 유효한 측정값으로 판단을 하게 되므로 변조 신호 유무를 측정할 수 없는 단점이 있다. The block for maintaining or converting the phase difference measured by the phase difference conversion reference value has been mentioned above. also,

When is 180 degrees, the phase difference reference value to the phase difference conversion reference value are judged as effective measurement values, so there is a disadvantage in that the presence or absence of a modulated signal cannot be measured.

=80도인 경우, 위상차 기준값 80도범위 이내로 측정된 위상차는 유효한 측정값으로 판단하고, 범위 밖(도 7 내지 10의 점선 영역)으로 측정된 위상차는 변조가 있는 것으로 판단할 수 있다. 위상차 변화 측정 범위는 위상차 기준값에 상관없이 280도이고, 아래의 표 3과 같이 변조 여부가 출력될 수 있다.On the other hand, as in the examples of FIGS. 7 to 10

= 80 degrees, the phase difference measured within the range of 80 degrees of the phase difference reference value is determined as a valid measurement value, and the phase difference measured outside the range (the dotted line area in FIGS. 7 to 10) may be determined to have modulation. The phase difference change measurement range is 280 degrees regardless of the phase difference reference value, and modulation can be output as shown in Table 3 below.

)를 리셋하고, 측정 끝 신호의 수신 시점까지 또는 설계 시 결정한 샘플 수까지 평균 연산(running mean)을 수행하며, 최초 측정한 위상차(

)와 동일한 범위(-180도 내지 180도)로 변환하여 주파수 연산부(170)로 위상차 평균(

)을 출력할 수 있다.Next, the average block 153 is the final phase difference according to the reception of the measurement start signal (

) is reset, and the average operation (running mean) is performed until the reception point of the measurement end signal or the number of samples determined at the time of design, and the first measured phase difference (

) and converted to the same range (-180 degrees to 180 degrees), and the phase difference averaged by the frequency calculator 170 (

) can be output.

)을 이용하여 주파수를 연산하고 방향탐지부(180)로 주파수와 해당 채널번호를 출력할 수 있다.The frequency calculating unit 170 averages the phase difference received from the plurality of frequency phase difference measuring units 150 (

) can be used to calculate the frequency and output the frequency and the corresponding channel number to the direction detection unit 180.

The phase difference measuring unit 160 for direction finding is composed of M equal to the number of channels in order to measure the phase difference between paths of the same channel. Each direction finding phase difference measuring unit 160 receives measured phases of the same narrowband channel corresponding to all paths (paths 1 to 10). Each direction finding phase difference measuring unit 160 is configured according to the path to be measured (eg, phase difference between path 1 and path 2, phase difference between path 1 and path 3, etc.) Measurement unit blocks may be included in parallel.

11 illustrates the measurement of the phase difference between channel 1 of path 1 and channel 1 of path 2. As in FIG. 2, the phase difference measurement unit 160 for direction finding includes a phase difference calculation block 161 and a phase difference conversion block. (162) and an average block (163).

)을 수행한 후에 0도 내지 360도 변환하는 과정을 수행할 수 있다. 위상차 변환 블록(162)과 평균 블록(163)의 역할과 기능은 도 2에서 설명한 주파수용 위상차 측정부(150)의 위상차 변환 블록(152)과 평균 블록(153)의 역할과 기능과 동일하므로 상세한 설명은 생략한다. 다만, 각

는 0도 내지 360도 범위를 가지므로

는 180도 이상, 180도 미만인지 비교하는 부분이 변경된다. 평균 블록(163)은 0도 내지 360도 범위 변환 블록을 포함하고 최종 위상차 평균(

)을 방향탐지부(180)로 출력한다.Since the final phase difference value for direction detection is 0 to 360 degrees, the phase difference calculation block 161 receives the phase within the range of -180 degrees to 180 degrees from the signal measurer and calculates the phase difference with the phase of each path (

), a process of converting from 0 degrees to 360 degrees may be performed. Since the roles and functions of the phase difference conversion block 162 and the average block 163 are the same as those of the phase difference conversion block 152 and the average block 153 of the frequency phase difference measurement unit 150 described in FIG. omit explanation. However, each

has a range from 0 degrees to 360 degrees, so

The part that compares whether it is greater than or equal to 180 degrees and less than 180 degrees is changed. The average block 163 includes a 0 degree to 360 degree range conversion block and the final phase difference average (

) is output to the direction detection unit 180.

)을 이용하여 방향(방위각 및 고각)을 연산하고, 해당 채널번호, 주파수, 방향(방위각 및 고각)을 출력한다. The direction detecting unit 180 averages the phase difference received from the phase difference measuring unit 160 for direction finding (

) is used to calculate the direction (azimuth and elevation), and outputs the corresponding channel number, frequency, and direction (azimuth and elevation).

The drawings and detailed description of the present invention referred to so far are only examples of the present invention, which are only used for the purpose of explaining the present invention, and are used to limit the scope of the present invention described in the meaning or claims. It is not. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

100: wideband digital receiver
110: analog-digital conversion unit
120: multiphase filter bank unit
130: signal measuring unit
140: signal detection unit
150: phase difference measuring unit for frequency
151, 161: phase difference calculation block
152, 162: phase difference conversion block
153, 163: average block
160: phase difference measuring unit for direction finding
170: frequency calculation unit
180: direction finding unit

Claims (16)

a multiphase filter bank unit dividing the wideband reception band into M narrowband channels and outputting baseband I/Q signals for each of the divided narrowband channels;
a signal measuring unit receiving the I/Q signal and measuring a phase and a signal level;
a signal detector outputting a measurement start signal and a measurement end signal by comparing the signal level with a set threshold;
a phase difference measurement unit for frequency that receives the phase measured by the signal measurement unit and outputs an average phase difference;
a frequency calculation unit for calculating a frequency using the average phase difference received from the frequency phase difference measuring unit;
a phase difference measurement unit for direction finding that receives the measured phase of the same narrowband channel from the signal measurement unit and outputs an average phase difference; and
A direction detection unit for calculating a direction using the average phase difference received from the direction detection phase difference measurement unit;
The phase difference measuring unit for the frequency,
The phase within the range of -180 degrees to 180 degrees is received from the signal measurer, the phase difference is calculated by delaying one sample of the phase within the range of -180 degrees to 180 degrees, and the phase difference calculation result in the range of -360 degrees to 360 degrees is performed. a phase difference calculation block that converts to a range of -180 degrees to 180 degrees;
The phase difference calculation result in the range of -180 degrees to 180 degrees is received from the phase difference calculation block, the first phase difference is set as the phase difference reference value at the time of input of the measurement start signal, and continuous values in the effective range reference value area based on the phase difference reference value a phase difference conversion block that determines a phase difference conversion reference value to maintain or converts a phase difference value to output a final phase difference; and
An average block that resets the final phase difference according to reception of the measurement start signal, performs an average operation until the measurement end signal is received, converts the averaged phase difference into a range of -180 degrees to 180 degrees, and outputs an average phase difference. including,
The phase difference conversion block calculates the phase difference conversion reference value according to the phase difference reference value and the effective range reference value by Equation

Determined by, α is a value set by the user as the effective range reference value,
The phase difference conversion block determines whether the phase difference measured within the range of the phase difference reference value ± α is a valid measurement value, determines whether the phase difference measured outside the range of the phase difference reference value ± α is modulated, and outputs whether or not the modulation is present Wideband digital receiver. According to claim 1,
The polyphase filter bank unit is composed of N corresponding to N paths,
A wideband digital receiver in which each of the N polyphase filter bank units divides a wideband reception band into M narrowband channels and outputs a baseband I/Q signal for each of the divided narrowband channels. According to claim 2,
The signal measuring unit is composed of N×M pieces so as to correspond 1: 1 to the M narrowband channels of the N paths,
A wideband digital receiver where each of the N×M signal measuring units receives the I/Q signal and measures the phase and signal level. According to claim 3,
The signal detection unit is composed of M corresponding to M signal measurement units in one path among the N paths,
A wideband digital receiver for outputting a measurement start signal and a measurement end signal by comparing the signal level with a set threshold value, wherein each of the M signal detection units outputs a measurement start signal and a measurement end signal. According to claim 4,
The frequency phase difference measuring unit is composed of M corresponding to M signal detection units in one path among the N paths,
A broadband digital receiver in which each of the M frequency phase difference measuring units receives the phase measured from the signal measuring unit and outputs an average phase difference. According to claim 4,
The phase difference measurement unit for direction finding is composed of M equal to the number of M narrowband channels,
A wideband digital receiver in which each of the M direction finding phase difference measurement units receives measured phases of the same narrowband channel corresponding to the N paths and outputs an average phase difference. According to claim 6,
Each of the M phase difference measurement units for direction finding receives a phase within the range of -180 degrees to 180 degrees from the signal measurement unit, performs a phase difference operation with the phase of each path, and then converts the phase from 0 degrees to 360 degrees. digital receiver. delete In the phase difference measurement method for frequency measurement and interferometer direction finding,
dividing the wideband reception band into M narrowband channels by a polyphase filter bank unit and outputting baseband I/Q signals for each of the divided narrowband channels;
receiving the I/Q signal and measuring a phase and a signal level by a signal measurer;
comparing the signal level with a set threshold and outputting a measurement start signal and a measurement end signal by a signal detection unit;
receiving the measured phase from the signal measuring unit by a phase difference measurement unit for frequency and outputting a first average phase difference;
calculating a frequency using the first average phase difference by a frequency calculator;
receiving the measured phase of the same narrowband channel from the signal measuring unit by a phase difference measurement unit for direction finding and outputting a second average phase difference; and
A direction detection unit calculating a direction using the second phase difference average,
The phase difference measurement unit for frequency receives a phase within the range of -180 degrees to 180 degrees from the signal measurement unit, calculates a phase difference by delaying one sample of the phase within the range of -180 degrees to 180 degrees, and calculates a phase difference between -360 degrees and 360 degrees. The phase difference calculation result in the range of degrees is converted into the range of -180 degrees to 180 degrees, the first phase difference is set as the phase difference reference value at the time of input of the measurement start signal, and continuous values are maintained in the effective range reference value area based on the phase difference reference value. The phase difference conversion reference value is determined to maintain or convert the phase difference value to output the final phase difference, the final phase difference is reset according to the reception of the measurement start signal, and an average operation is performed until the measurement end signal is received, and the average converting the calculated phase difference into a range of -180 degrees to 180 degrees and outputting an average phase difference;
The phase difference measuring unit for the frequency calculates the phase difference conversion reference value according to the phase difference reference value and the effective range reference value by Equation

Determined by, α is a value set by the user as the effective range reference value,
The phase difference measuring unit for the frequency determines the phase difference measured within the range of the phase difference reference value ± α as an effective measurement value, determines whether the phase difference measured outside the range of the phase difference reference value ± α is modulated, and outputs whether or not the phase difference is modulated. Phase difference measurement method. According to claim 9,
The polyphase filter bank unit is composed of N corresponding to N paths,
A phase difference measurement method in which each of the N polyphase filter bank units divides a wideband reception band into M narrowband channels and outputs a baseband I/Q signal for each of the divided narrowband channels. According to claim 10,
The signal measuring unit is composed of N×M pieces so as to correspond 1: 1 to the M narrowband channels of the N paths,
A phase difference measurement method in which each of the N×M signal measuring units receives the I/Q signal and measures the phase and signal level. According to claim 11,
The signal detection unit is composed of M corresponding to M signal measurement units in one path among the N paths,
A phase difference measurement method in which each of the M signal detectors compares the signal level with a set threshold value and outputs a measurement start signal and a measurement end signal. According to claim 12,
The frequency phase difference measuring unit is composed of M corresponding to M signal detection units in one path among the N paths,
A phase difference measurement method in which each of the M frequency phase difference measuring units receives the phase measured from the signal measuring unit and outputs an average phase difference. According to claim 12,
The phase difference measurement unit for direction finding is composed of M equal to the number of M narrowband channels,
A phase difference measuring method in which each of the M direction finding phase difference measurement units receives measured phases of the same narrowband channel corresponding to the N paths and outputs an average phase difference. According to claim 14,
Each of the M phase difference measuring units for direction finding receives a phase within the range of -180 to 180 degrees from the signal measuring unit, performs a phase difference operation with the phase of each path, and then converts the phase from 0 to 360 degrees. measurement method. delete

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