JP2008109461A - Digital receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the number of receiving frequencies more after securing required receiving sensitivity in each receiving frequency by efficiently using an element antenna and component parts attached to the element antenna. <P>SOLUTION: This digital receiver having a plurality of antennas 11, a receiving part 12, an AD conversion processing part 13, a beam synchronizing part 14 and a reception processing part 15 is provided with a reception managing part 17 which sets direction information inputted from an antenna-reception inputting part 16 to direct an antenna and beams to be used in the beam synthesizing part, sets frequency bandwidth, a signal detection rule and information of a demodulating method in the reception processing part, compares a receiving level of a signal processed by the reception processing part with a required receiving level and calculates the overage and shortage of a receiving level of each reception processing part, wherein a required receiving sensitivity in each receiving frequency is ensured and then the number of receiving frequencies is increased more. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a digital receiver capable of receiving a plurality of signals by receiving radio waves radiated from a plurality of radio wave sources, AD-converting received signals and performing digital signal processing.

  In a digital receiver, analog-to-digital (AD) conversion is performed on a signal from an antenna, and the signal is input to a reception processing unit that processes a plurality of digital signals, thereby receiving signals from a plurality of types of radio wave sources. Is possible. For example, when there are a plurality of element antennas and a signal from each antenna is input to the reception processing unit, a different beam is formed for each reception processing unit by the DBF (Digital Beam Forming) method, and an appropriate beam for each signal is formed. By preparing this, it is possible to optimize reception.

In this way, the signal received by the antenna is converted to an intermediate frequency by the receiving unit, further converted to a digital signal by the AD converting unit, the converted digital signal is input to each beam combining unit, and after beam combining In a digital receiver configured to detect signals from a plurality of types of radio wave sources by receiving a signal with a reception processing unit, a reception database unit in which information related to an incoming signal is stored in advance is provided and designated reception Based on the target, information on the corresponding incoming signal is read from the reception database unit, and the beam width generated by the beam combining unit is optimally controlled based on the information, and the reception bandwidth extracted by the reception processing unit is optimally controlled. There is a reception processing device adapted to do so. (For example, Patent Document 1)
Japanese Patent Laid-Open No. 9-230019

  However, in the conventional digital receiver described above, the detection probability can be increased by controlling the beam width and the reception bandwidth based on a preset gain, but the reception parameters can be optimized according to the actual reception level. In order to use element antennas efficiently, the number of element antennas used in each reception processing unit has not been optimized. Also, when receiving the target signals with different frequencies at the same time in the digital receiver, a plurality of reception processing units are prepared and each frequency is received at the same time. There was a problem that it was not done.

  The present invention has been made in view of the above circumstances, and efficiently uses the element antenna and the components associated therewith to ensure the necessary reception sensitivity at each reception frequency and further increase the number of reception frequencies. Alternatively, an object of the present invention is to provide a digital receiving apparatus that increases the accuracy with which an important frequency can be received.

  In the digital receiver according to the present invention, a plurality of antennas for receiving incoming signals, a plurality of receiving units for frequency-converting received signals output from the plurality of antennas to intermediate frequency signals, and a plurality of receiving units for output A plurality of AD conversion processing units for converting frequency-converted analog signals into digital signals, and digital signals from the plurality of AD conversion processing units are selectively input, and the target signal is spatially based on the selected signals. A plurality of beam synthesizers that create and output the signals, and a plurality of reception processors that perform signal detection processing by extracting signals of a specified frequency bandwidth from the output signals of the plurality of beam synthesizers To input information such as the antenna to be used, the beam direction, the center frequency of the signal, the frequency bandwidth, the rule of signal detection, the demodulation method, and the signal-to-noise ratio required for demodulation and signal detection According to the information input from the tena / reception input unit and the antenna / reception input unit, the antenna used in the beam combining unit and the information on the direction of the beam are set in each beam combining unit and extracted by each reception processing unit. Set the frequency bandwidth, signal detection rules, and demodulation method information in each reception processing unit, receive the specification data of the signal received from each reception processing unit, receive level included in the specification data, and necessary The reception management unit that compares the required reception level calculated based on the S / N ratio, calculates the excess or deficiency of the reception level in each reception processing unit, and issues an alarm if the reception level is insufficient, and each beam Information on the antenna used in the combining unit and information on the center frequency of the signal input to each reception processing unit are input, and the antenna / frequency that instructs frequency conversion to each receiving unit in response to these inputs And a control unit, the reception processing unit in accordance with the excess or deficiency of the receiving level detected by the reception management unit is one that was possible to change the numbers of antennas used.

  According to the digital receiver according to the present invention, the number of reception frequencies can be increased more or more importantly while efficiently using the element antenna and the components associated therewith and ensuring the necessary reception sensitivity at each reception frequency. The accuracy with which the frequency can be received can be increased.

Embodiment 1 FIG.
A digital receiver according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram of the digital receiver, FIG. 2 is a detailed block diagram of a reception management unit of the digital receiver, and FIG. 3 is a flowchart for explaining the operation.
1 and 2, the digital receiver of the present invention includes antenna units 11-1 to 11-N, receiving units 12-1 to 12-N, AD conversion processing units 13-1 to 13-N, and a beam combining unit. 14-1 to 14-M, reception processing units 15-1 to 15-M, an antenna / reception input unit 16, a reception management unit 17, and an antenna / frequency control unit 18. Each configuration from the antenna unit 11 to the AD conversion processing unit 13 is configured by a plurality of N circuit units, and each configuration from the beam combining unit 14 to the reception processing unit 15 is configured by a plurality of M circuit units. ing. Hereinafter, when these circuit configurations are collectively described, reference numerals (1 to N, 1 to M) are omitted.

The antenna units 11-1 to 11-N capture radio signals from a plurality of radio sources in a wide coverage area of the air field and output the captured signals. The receiving units 12-1 to 12 -N input the output signal from the antenna 11 and amplify the high frequency, and in accordance with the input from the antenna / frequency control unit 18, frequency-convert the input signal to an intermediate frequency signal. The AD conversion processing units 13-1 to 13-N receive the output signal from the receiving unit 12 and perform AD conversion to convert it into a digital signal. In general, frequency conversion is often performed so that the intermediate frequency becomes a DC component before or after AD conversion. A signal converted into a digital signal is referred to as IQ data.
The beam combining units 14-1 to 14-M select the IQ data input from each AD conversion processing unit 13 in accordance with the designation from the reception management unit 17, and perform digital beam forming based on the selected IQ data. carry out. In this way, the beam combining units 14-1 to 14-M combine the signals so that the beam is directed in the direction designated by the reception management unit 17, and output IQ data in which the signals in the directions are emphasized. The reception processing units 15-1 to 15-M extract a signal having a frequency bandwidth specified by the reception management unit 17. From the extracted signal, the signal is detected according to the specified signal detection rules such as high level and signal continuing for the specified time width, and the specifications of the signal (signal level, transmission frequency) , Pulse repetition frequency, pulse width, antenna scanning method, antenna scanning speed, etc.).

The antenna / reception input unit 16 includes the antenna An used in each beam combining unit 14 and the direction θn in which the beam is directed, the center frequency Fo of the signal input to each reception processing unit 15, and the frequency band extracted by each reception processing unit 15. Information such as a width Fb, a signal detection rule L, a demodulation method Dm, and an S / N ratio necessary for demodulation and signal detection are input.
In accordance with the information input from the antenna / reception input unit 16, the reception management unit 17 inputs information on the antenna An used in each beam combining unit 14 and the azimuth direction θn to the antenna / beam control unit 171 for signal processing. The antenna to be used and the directivity are set for each beam combining unit 14. Information such as the frequency bandwidth Fb, the demodulation method Dm, and the signal detection rule L extracted by each reception processing unit 15 is input to the reception signal control unit 172 for signal processing. Set bandwidth, demodulation method, and signal detection rules. Further, each reception processing unit 15 includes a necessary reception level setting unit 173 that calculates and sets a necessary reception level required by each reception processing unit 15 based on information such as a necessary SN ratio and NF (Noise Figure = noise figure). A reception signal level detection unit 174 for detecting the reception level of the specification data of the received signal, and the signal level detected by the reception signal level detection unit 174 by the comparator 175 is set by the necessary reception level setting unit 173 Compare whether the signal level is excessive or insufficient. When the reception level from the reception processing unit 15 is not enough for the required reception level, a signal is output from the comparator 175 and an alarm is displayed or sounded by the alarm unit 176. The antenna / frequency control unit 18 inputs information on the antenna An used in each beam combining unit 14 and information on the center frequency Fo of the signal input to each reception processing unit 15, and the frequency of the local transmitter in each reception unit 12. To control.

Next, the operation according to the first embodiment of the present invention will be described with reference to the flowchart shown in FIG.
In step S101, the antenna An and the reception input unit 16 use the antenna An used in each beam combining unit 14 and the direction θn of the beam, the center frequency Fo of the signal input to each reception processing unit 15, and the reception processing unit 15 Information such as the frequency bandwidth Fb to be extracted, the signal detection rule L, the demodulation method Dm, the S / N ratio necessary for demodulation and signal detection, etc. are input, and the antenna to be used and the reception conditions are set.
For example, when three signals from the radio wave source 1 to the radio wave source 3 are to be detected by the plurality of antennas 11-1 to 11-N in FIG. 1, three center frequencies Fo are input and the antenna beam is further directed. The direction θn is set. Three different azimuths θn for directing beams may be input, or the same azimuth may be input.

In step S102, in the reception management unit 17, according to the information input from the antenna / reception input unit 16, the antenna An used for each beam combining unit 14, the azimuth direction θn, and the input to each reception processing unit 15 The reception conditions such as the center frequency Fo of the signal to be extracted, the frequency bandwidth Fb to be extracted, the demodulation method Dm, the rule L for signal detection are set.
For example, since the antennas 11-1 to 11-3 in FIG. 1 detect signals from the radio wave source 1, the beam combining unit 14-1 is connected to the AD conversion processing unit 13- connected to the antennas 11-1 to 11-3. The antennas 11-1 to 11-3 are set to the beam combining unit 14-1 and the beam directing direction θ1 is set so that the output signals from 1 to 13-3 are input. Similarly, antennas 11-4 to 11-5 are set for the beam combining unit 14-2, and the beam directing direction θ2 is set. For the beam combining unit 14-3, the antenna 11-N is set and the beam directing direction θ3 is set.

  In the reception processing unit 15-1 connected to the beam combining unit 14-1, reception conditions such as a center frequency Fo 1, a frequency bandwidth Fb 1 to be extracted, a demodulation method Dm, and a signal detection rule L are set. Similarly, reception conditions such as the center frequency Fo2, the frequency bandwidth Fb2 to be extracted, the demodulation method Dm, and the signal detection rule L are set in the reception processing unit 15-2 connected to the beam combining unit 14-2. In the reception processing unit 15-3 connected to the beam combining unit 14-3, reception conditions such as a center frequency Fo3, a frequency bandwidth Fb3 to be extracted, a demodulation method Dm, and a signal detection rule L are set.

  Further, each of the frequency bandwidths Fb1 to Fb3 used in each of the reception processing units 15-1 to 15-3, the S / N ratio necessary for demodulation and signal detection, and the NF (Noise Figure = noise figure) of the device known in advance. From the information, the necessary reception level setting unit 173 calculates the necessary reception level required by each of the reception processing units 15-1 to 15-3.

In step S 103, information on the antenna An used in each beam combining unit 14 and information on the center frequency Fo of the signal input to each reception processing unit 15 are input to the antenna / frequency control unit 18. Since the reception processing unit 15 and the beam combining unit 14 are in a one-to-one correspondence, the reception processing unit 15 that uses a certain antenna is known from the antennas used in each beam combining unit 14. When the center frequency of a signal input to the reception processing unit 15 using a certain antenna is Fo, the receiving unit 12 corresponding to that antenna performs the frequency conversion in which the frequency Fo becomes the intermediate frequency Fif. To instruct.
For example, for the receiving units 12-1 to 12-3 using the antennas 11-1 to 11-3, the oscillation frequency of the local oscillator is converted so that the intermediate frequency becomes Fi1. For the receiving units 12-4 to 12-5 using the antennas 11-4 to 11-5, the oscillation frequency of the local oscillator is converted so that the intermediate frequency is Fi2. Furthermore, for the receiving unit 12-N using the antenna 11-N, the oscillation frequency of the local oscillator is converted so that the intermediate frequency becomes Fi3.

In step S104, the antenna units 11-1 to 11-N capture radio signals of the frequencies f1, f2, and f3 generated from the plurality of radio sources 1 to 3 existing in the air and receive the received signals. Is output.
In step S105, the receiving units 12-1 to 12-N take the output signals from the antennas 11-1 to 11-N as inputs, and convert the input signals to intermediate frequency signals according to the input from the antenna / frequency control unit 18. Convert frequency.

  In step S106, the AD conversion processing units 13-1 to 13-N perform AD conversion using the output signals from the receiving units 12 as inputs, and convert them into digital signals. In general, frequency conversion is often performed so that the intermediate frequency becomes a DC component before or after AD conversion. A signal converted into a digital signal is called IQ data.

In step S107, the beam combining units 14-1 to 14-M select the IQ data input from each AD conversion processing unit 13 according to the designation, and perform digital beam forming based on the selected IQ data. The beam is directed in a designated direction, and IQ data in which the signal in the direction is emphasized is output. In digital beam forming, it is possible to specify a plurality of orientations, and it is possible to specify not only the orientation to be emphasized but also the orientation to be suppressed.
For example, in the beam combiner 14-1, the antennas 11-1 to 11-3 and the beam directing direction thereof are set to θ1, and based on this, the beam combiner 14-1 converts the AD conversion processor 13-1. The digital beam forming is performed with the output of ˜13-3 and the IQ data is output. Similarly, the beam combining unit 14-2 performs digital beam forming on the output of the AD conversion processing units 13-4 to 13-5 based on the antennas 11-4 to 11-5 and the beam directing direction θ2. The IQ data is output. The beam combining unit 14-3 performs digital beam forming on the output of the AD conversion processing unit 13-N based on the antenna 11-N and its beam directing direction θ3, and outputs the IQ data.

In step S108, the reception processing units 15-1 to 15-M extract the signal having the frequency bandwidth Fb designated by the reception management unit 17. The extracted signal is detected according to a specified signal detection rule L such as a high level or a signal continuing for a specified time width, and the specifications such as the level of the signal are measured. To do. Further, if the signal is communication, demodulation processing is performed according to the designated demodulation method Dm. The measured signal data is output to the received signal level detector 174 of the reception manager 17.
For example, the reception processing unit 15-1 extracts the signal having the center frequency Fo1 with the frequency bandwidth Fb1, and detects the signal having the frequency f1 corresponding to the radio wave source 1. Similarly, the reception processing unit 15-2 extracts the signal having the center frequency Fo2 with the frequency bandwidth Fb2, and detects the signal having the frequency f2 corresponding to the radio wave source 2. Further, the reception processing unit 15-3 extracts the signal having the center frequency Fo3 with the frequency bandwidth Fb3, and detects the signal having the frequency f3 corresponding to the radio wave source 3.

In step S109, the reception signal level detection unit 174 that receives the specification data such as the level of the signal received from each reception processing unit 15 detects the reception signal level included in the specification data, and sets the required reception level. The required reception level calculated by the unit 173 is compared with the comparator 175.
In step 110, the comparator 175 determines whether the reception level of each reception processing unit 15 is excessive or insufficient. If the reception level of a certain reception processing unit 15 is insufficient with respect to the required reception level, the reception status is displayed. In the screen to be displayed, the alarm device 176 sounds an alarm display or alarm that the reception level of the reception processing unit 15 is insufficient. The operator who has recognized the alarm returns to step S101 and resets it with the antenna / reception input unit 16.
For example, if the reception level of the signal received by the reception processing unit 15-2 is less than the calculated required reception level, the antenna / reception input unit 16 sets the antenna to be set in the beam combining unit 14-2. The number is reset to increase from 2 to 3 or 4, and the number of antennas used by the reception processing unit 15-2 is changed. At the same time, the antenna gain may be increased by narrowing the frequency bandwidth Fb2 set in the reception processing unit 15-2. When changing the frequency bandwidth, the spectrum of the received signal is displayed on a display device and compared with the bandwidth. If the bandwidth of the received signal is small, the bandwidth is narrowed.
On the other hand, when the signal level detected by the reception signal level detection unit 174 is excessive from the set required signal level, the number of antennas to be set in the beam combining unit 14 is reset or the reception processing unit 15 is set. The frequency bandwidth Fb to be set may be narrowed to reduce the antenna gain, and the reduced amount may be distributed to other reception processing units 15 having insufficient signal levels.

  As described above, according to the first embodiment of the present invention, since the frequency received by each element antenna can be set to the frequency processed by the reception processing unit 15, a plurality of frequencies can be received and according to the reception level. Since the operator can change the number of antennas used by each reception processing unit 15, that is, the antenna gain, reception using the necessary antenna gain according to the situation becomes possible.

Embodiment 2. FIG.
A digital receiver according to Embodiment 2 of the present invention will be described with reference to FIGS. 4 is a block diagram of the digital receiver, FIG. 5 is a detailed block diagram of the reception management output unit of the digital receiver, and FIG. 6 is a flowchart for changing the distribution of antennas to be used.
4 and 5, the digital receiver of the present invention includes antenna units 11-1 to 11-N, receiving units 12-1 to 12-N, AD conversion processing units 13-1 to 13-N, and a beam combining unit. 14-1 to 14-M, reception processing units 15-1 to 15-M, an antenna / frequency control unit 18, an antenna / reception / priority input unit 20, a reception management output unit 21, and a use antenna distribution unit 22 Yes.

  Antenna units 11-1 to 11-N, receiving units 12-1 to 12-N, AD conversion processing units 13-1 to 13-N, beam combining units 14-1 to 14-M, and receiving processing units 15-1 to 15-1 The 15-M antenna / frequency control unit 18 has the same configuration as that of the first embodiment, and a description thereof will be omitted.

The antenna / reception / priority input unit 20 has substantially the same configuration as that of the antenna / reception input unit 16 in the first embodiment. In addition to this, the priority information of each reception processing unit 15 can also be input. It has become. The priority information is output to the reception signal control unit 212 of the reception management output unit 21.
The reception management output unit 21 has substantially the same configuration as the reception management unit 17 in the first embodiment, but in addition to this, information such as the input priority of each reception processing unit 15 and the extracted frequency bandwidth Fb Is output from the received signal control unit 212 to the used antenna distribution unit 22. Further, information on the antenna used An used in each beam combining unit 14 and the direction θn for directing the beam is output from the antenna / beam control unit 211 to the used antenna distribution unit 22. Further, the signal of excess or deficiency of the reception level in each reception processing unit 15 compared by the comparator 215 is output to the used antenna distribution unit 22. The necessary reception level setting unit 213, the reception signal level detection unit 214 that detects the level of the signal output from each reception processing unit 15, and the alarm device 216 are the same as those in the first embodiment.

  The used antenna distribution unit 22 sets, as initial values at the start of operation, the antenna An used in each beam combining unit 14 from the antenna / reception / priority input unit 20 and the center frequency fo of the signal input to each reception processing unit 15. Since information is input, the information is output to the antenna / frequency control unit 18. The initial value information may be input from the antenna / beam control unit 211 and the reception signal control unit 212 to the use antenna distribution unit 22 and output from the use antenna distribution unit 22 to the antenna / frequency control unit 18. In addition, the used antenna distribution unit 22 stores how many antennas are currently used in descending order of the priority of each input reception processing unit 15, and the reception level excess from the comparator 215 is exceeded. Based on the shortage, which antenna An is assigned to which reception processing unit 15 is calculated so as to be optimal in a timely manner, and signals are sent to the antenna / beam control unit 211 and the reception signal control unit 212. If the use antenna distribution unit 22 instructs the antenna / beam control unit 211 to increase or decrease the number of antennas used by each beam combining unit 14, each beam combining unit 14 is instructed. Reconfigure to change the antenna used. When the use antenna distribution unit 22 instructs the reception signal control unit 212 to change the frequency bandwidth used by each reception processing unit 15, the frequency bandwidth of each reception processing unit 15 is reset. To do.

Next, the operation of changing the distribution of antennas used according to the second embodiment of the present invention will be described based on the flowchart shown in FIG.
In step S201, the comparator 215 detects whether or not there is a reception processing unit 15 whose signal level (gain) is insufficient. If there is no signal level (gain) shortage in any of the reception processing units 15, the process goes to step S202 and the distribution ends as it is. If at least one of the reception processing units 15 has insufficient gain, the process goes to step S203 to check the priority of the reception processing unit 15 having insufficient gain, and the reception processing unit having the highest priority among the insufficient gains. Select RSPn. In step S204, it is determined whether there is a reception processing unit RSPm having a surplus gain in the reception processing unit 15. If there is a reception processing unit RSPm having a surplus gain, the process proceeds to step S205, and the antenna connected to the reception processing unit RSPm having a surplus gain is given the highest priority within a range that does not become insufficient from the reception processing unit RSPm having a surplus gain. It changes so that it may increase to the high reception processing part RSPn. In step S204, if there is no reception processing unit RSPm having a surplus gain in the reception processing unit 15, the process proceeds to step S206. In step S206, the antenna connected to the reception processing unit RSPm having the lowest priority to which the antenna is allocated is changed to the reception processing unit RSPn having the highest priority. In step S207, it is determined whether the gain of the reception processing unit RSPn having a high priority that has been changed so as to increase the antenna is sufficient. If the gain is sufficient, the process returns to step S201. If the gain is still insufficient, the process returns to step S204 to determine whether or not there is a reception processing unit RSPm having a surplus gain in the reception processing unit 15, and the above operation is repeated.

As described above, the reception management output unit 21 inputs the information on the priority in each reception processing unit 15, the excess or deficiency of the reception level, the used antenna An, and the direction θn of beam direction to the used antenna distribution unit 22. In this case, the distribution of the number of antennas used by each reception processing unit 15 is changed in order of priority of each reception processing unit 15 so that the shortage of reception levels is resolved.
For example, in FIG. 4, three reception processing units 15-1 to 15-3 are used, the reception processing unit 15-1 has the highest priority A, and the reception processing unit 15-2 has the priority. B. When the reception processing unit 15-3 has the lowest priority C, the number of antennas to be used is increased so that the reception processing unit 15-1 having the priority A can satisfy the necessary SN ratio. Therefore, there is no way for the reception processing unit 15-3 having a low priority to satisfy the necessary SN ratio. If there is a reception processing unit 15 that is sufficiently larger than the necessary SN ratio, the number of antennas is decreased.

When allocating the number of antennas, considering the beam width, the antennas 11 that are as close as possible are used in the same beam combining unit 14, or conversely, the antennas 11 that are as far away as possible are used as the same beam combining unit 14. It is also possible to consider the conditions for allocating for use in
Further, when the azimuth θn directed to the antenna is different from each other, it is possible to change the distribution of the antenna in consideration of this.

  After changing the distribution of the antennas to be used, information on the antenna An used in the beam combining unit 14 and the center frequency Fo of the signal input to each reception processing unit 15 reflecting the change is sent to the antenna / frequency control unit 18. In addition to outputting, information on the antenna used by each beam combining unit 14 is also output to the reception management output unit 21.

According to the second embodiment of the present invention, it is possible to efficiently use the element antenna and the components associated therewith and to ensure the necessary reception sensitivity at each reception frequency according to the priority.
In the second embodiment, the use antenna distribution unit 22 is provided, exchanges information with the reception management output unit 21, and calculates that the use antenna distribution unit 22 distributes the use antennas in order of priority. The antenna / beam control unit 211 and the reception signal control unit 212 were controlled. However, in the first embodiment, the priority of the reception processing unit 15 can be set in the antenna / reception input unit 16, and the priority information is input to the reception signal control unit 172, and the information is input to the antenna / beam control. The antenna / beam control unit 171 inputs a signal whose signal level is insufficient from the comparator 175, and the antenna / beam control unit 171 uses the antenna distribution of the second embodiment. By providing the function of the unit 22, the necessary reception sensitivity may be ensured according to the priority of the reception processing unit 15 as in the second embodiment.

Embodiment 3 FIG.
A block diagram of a digital receiver according to Embodiment 3 of the present invention is shown in FIG.
The digital receiver of the present invention shown in FIG. 7 includes an antenna unit 11-1 to 11-N, a receiver unit 12-1 to 12-N, an AD conversion processing unit 13-1 to 13-N, a beam combining / rectangular measuring unit. 30-1 to 30-M, reception processing units 15-1 to 15-M, antenna / reception / priority input unit 20, antenna / frequency control unit 18, used antenna distribution unit 22, and reception direction management output unit 31 I have.

  Antenna units 11-1 to 11-N, receiving units 12-1 to 12-N, AD conversion processing units 13-1 to 13-N, receiving processing units 15-1 to 15-M, antenna / reception / priority input The unit 20, the antenna / frequency control unit 18, and the used antenna distribution unit 22 have the same configurations as those in the second embodiment, and a description thereof will be omitted.

  The beam combining / rectangular measuring units 30-1 to 30-M have substantially the same configuration as the beam combining unit 14 in the second embodiment, but in addition to this, the antenna signal is actually obtained from the output signal of the AD conversion processing unit 13. The azimuth measurement in which the beam is directed is also performed, the beam azimuth is switched based on the azimuth measurement result, and the result is output to the reception direction management output unit 31.

  The reception direction management output unit 31 has substantially the same configuration as the reception management output unit 21 in the second embodiment. However, the beam directing direction input to each of the beam combining / rectangulation units 30-1 to 30-M is first directed to the beam input from the antenna / reception / priority input unit 20. When the azimuth measurement result measured by the beam synthesis / rectangular measuring units 30-1 to 30-M is input, the azimuth is changed from the initial value to the azimuth measurement result and managed.

The azimuth θn that directs the beam input from the antenna / reception / priority input unit 20 is assumed, and is actually different or slightly shifted. Accordingly, the actual azimuth is measured by the beam synthesis / rectangular measuring units 30-1 to 30-M, and thereby the beam is directed to a precise azimuth.
According to the third embodiment of the present invention, the beam azimuth is based on the azimuth measurement result, that is, not the predetermined value, but can be directed to the azimuth where the radio wave actually arrives, so that the reception performance is improved. Can do.

Embodiment 4 FIG.
FIG. 8 shows a block diagram of a digital receiver according to Embodiment 4 of the present invention.
The digital receiver of the present invention shown in FIG. 8 includes antenna units 11-1 to 11-N, receiving units 12-1 to 12-N, AD conversion processing units 13-1 to 13-N, and beam combining unit 14-1. 14-M, reception processing units 15-1 to 15-M, an antenna / reception input unit 16, a reception management unit 17, an antenna / frequency control unit 18, and a changeover switch 41. The digital receiving apparatus according to the fourth embodiment is different from the first embodiment in that a changeover switch 41 is provided between the AD conversion processing units 13-1 to 13-N and the beam combining units 14-1 to 14-M. The configuration is the same as that of the first embodiment.
The changeover switch 41 inputs IQ data signals from the AD conversion processing units 13-1 to 13 -N, and receives information related to antennas used in each beam combining unit 14 from the reception managing unit 17. Based on these inputs, the switches are switched according to the antennas 11-1 to 11-N used by the beam combining units 14, and the IQ data signals from the AD conversion processing units 13-1 to 13-N are selectively selected. Input to the beam combining units 14-1 to 14-M.

Next, operation according to Embodiment 4 of the present invention will be described.
Antenna units 11-1 to 11-N, receiving units 12-1 to 12-N, AD conversion processing units 13-1 to 13-N, beam combining units 14-1 to 14-M, and receiving processing units 15-1 to 15-1 The 15-M, the antenna / reception input unit 16, and the antenna / frequency control unit 18 perform the same operation as in the first embodiment.
The reception management unit 17 outputs information regarding the antenna An used by each beam combining unit 14 input from the antenna / reception input unit 16 to the changeover switch 41. Since the IQ data is input to each changeover switch 41 from each AD conversion processing unit 13, the switch is switched based on the antenna 11 used by each beam combining unit 14, and the AD conversion processing unit designated by each beam combining unit 14 is specified. 13, that is, IQ data from the antenna 11 is output.
For example, the switch is switched so that only IQ data from the AD conversion processing units 13-1 to 13-3 is input to the beam combining unit 14-1. Similarly, the switch is switched so that only IQ data from the AD conversion processing units 13-4 to 13-5 is input to the beam combining unit 14-2. The switch is switched so that only IQ data from the AD conversion processing unit 13-N is input to the beam combining unit 14-3.

By adding the changeover switch 41 in this way, the amount of data exchanged between each AD conversion processing unit 13 and each beam combining unit 14 can be reduced.
That is, in the case of the first embodiment, IQ data of all the AD conversion processing units 13 is input to each beam combining unit 14, and when there are M beam combining units 14, the AD conversion processing unit 13 is M times IQ. Since data is output, the amount of data increases and the processing time also increases. However, when the changeover switch 41 is provided, each AD conversion processing unit 13 outputs data only to the switch, and this is switched by the switch and output to the beam combining unit 14, so that the data amount is compared with that of the first embodiment. 1 / M.

  Such a function of the changeover switch 41 can be applied to the second embodiment or the third embodiment.

It is a block block diagram of the digital receiver by Embodiment 1 of this invention. It is a detailed block diagram in the reception management part of the digital receiver by Embodiment 1 of this invention. It is a flowchart figure for demonstrating operation | movement of the digital receiver by Embodiment 1 of this invention. It is a block block diagram of the digital receiver by Embodiment 2 of this invention. It is a detailed block diagram in the reception management output part of the digital receiver by Embodiment 2 of this invention. In the digital receiver by Embodiment 2 of this invention, it is a flowchart figure at the time of changing distribution of the antenna to be used. It is a block block diagram of the digital receiver by Embodiment 3 of this invention. It is a block block diagram of the digital receiver by Embodiment 4 of this invention.

Explanation of symbols

11-1 to 11-N: antenna unit, 12-1 to 12-N: receiving unit,
13-1 to 13-N: AD conversion processing unit, 14-1 to 14-M: beam combining unit,
15-1 to 15-N: reception processing unit, 16: antenna / reception input unit,
17: Reception management unit, 18: Antenna / frequency control unit,
20: Antenna / reception / priority input unit, 21: Reception management output unit,
22: Used antenna distribution unit,
30-1 to 30-M: Beam synthesis / direction measurement unit 31: Reception direction measurement management output unit,
41: changeover switch,
171 and 211: antenna beam control unit, 172 and 212: received signal control unit,
173, 213: Necessary reception level setting unit, 174, 214: Reception signal level detection unit 175, 215: Comparator, 176, 216: Alarm device,

Claims (6)

A plurality of antennas each receiving incoming signals;
A plurality of receiving units for frequency-converting received signals output from the plurality of antennas to intermediate frequency signals, respectively;
A plurality of AD conversion processing units for converting analog signals subjected to frequency conversion output from the plurality of receiving units into digital signals;
A plurality of beam combining units that selectively input digital signals from the plurality of AD conversion processing units, create a target signal spatially based on the selected signals, and output the signals;
A plurality of reception processing units for extracting a signal having a specified frequency bandwidth from the output signals of the plurality of beam combining units and performing a signal detection process;
An antenna to be used, an antenna / reception input unit for inputting information on the beam direction, signal center frequency, frequency bandwidth, signal detection rule, demodulation method, S / N ratio necessary for demodulation and signal detection;
According to the information input from the antenna / reception input unit, the frequency band width that is set in each beam combining unit and information about the antenna used in the beam combining unit and the direction in which the beam is directed is extracted by each reception processing unit. , Setting signal detection rules and demodulation method information in the respective reception processing units, receiving specification data of signals received from the respective reception processing units, receiving levels included in the specification data, and the necessary Compared with the required reception level calculated based on the S / N ratio, calculates the excess or deficiency of the reception level in each reception processing unit, and if the reception level is insufficient, a reception management unit that issues an alarm;
Information on the antenna used in each beam combining unit and information on the center frequency of the signal input to each reception processing unit are input, and an antenna that instructs frequency conversion to each receiving unit according to these inputs A frequency control unit,
A digital receiving apparatus characterized in that the number of antennas used by the reception processing unit is changed according to the excess or deficiency of the reception level detected by the reception management unit.   The antenna / reception input unit can input the priority information of the reception processing unit, and the reception management unit resets each beam combining unit so that the reception level of each reception processing unit is solved in order of the priority. The digital receiver according to claim 1, wherein distribution of the number of antennas used by each reception processing unit is changed. A plurality of antennas each receiving incoming signals;
A plurality of receiving units for frequency-converting received signals output from the plurality of antennas to intermediate frequency signals, respectively;
A plurality of AD conversion processing units for converting analog signals subjected to frequency conversion output from the plurality of receiving units into digital signals;
A plurality of beam combining units that selectively input digital signals from the plurality of AD conversion processing units, create a target signal spatially based on the selected signals, and output the signals;
A plurality of reception processing units for extracting a signal having a specified frequency bandwidth from the output signals of the plurality of beam combining units and performing a signal detection process;
Antenna that inputs information on antenna to be used, beam direction, signal center frequency, frequency bandwidth, signal detection rule, demodulation method, S / N ratio required for demodulation and signal detection, and priority of reception processing unit・ Reception / priority input section,
According to the information input from the antenna / reception / priority input unit, information on the antenna used in the beam combining unit and the direction of the beam is set in each beam combining unit, and extracted by each reception processing unit. Information on frequency bandwidth, signal detection rule, and demodulation method is set in each reception processing unit, and specification data of a signal received from each reception processing unit is received, and a reception level included in the specification data The reception management output unit which compares the required reception level calculated based on the required SN ratio to calculate the excess or deficiency of the reception level in each reception processing unit and issues an alarm if the reception level is insufficient When,
At the start of operation, information on the antenna used in each beam combining unit and information on the center frequency of the signal input to each reception processing unit are input, and information indicating that the reception level is insufficient from the reception management output unit. When input, a signal for changing the distribution of the number of used antennas in each beam combining unit is sent to the reception management output unit in order of priority of each reception processing unit so as to eliminate the shortage of reception levels. Use antenna distribution section to output,
Information on the antenna used in each beam combining unit and information on the center frequency of the signal input to each reception processing unit are input, and an antenna that instructs frequency conversion to each receiving unit according to these inputs A digital receiver comprising a frequency control unit.   If there is a change in the number of used antennas from the used antenna distribution unit to the reception management output unit, the antenna used in each beam combining unit reflecting the change, and the center frequency of the signal input to each reception processing unit The digital receiver according to claim 3, wherein the signal is output to an antenna / frequency control unit.   The beam combining unit measures the azimuth in which the beam is actually directed from the input signal and transmits the measured beam azimuth to the reception management output unit. The reception management output unit determines the beam azimuth direction that has already been input. 5. The digital receiving apparatus according to claim 3, wherein the beam receiving direction is transmitted from the beam combining unit to be managed.   The output from the AD conversion processing unit and the information on the antenna used by each beam combining unit are input, the switch is switched according to the antenna used by each beam combining unit, the data input from the AD conversion processing unit, 6. The digital receiver according to claim 1, further comprising a changeover switch that outputs to a predetermined beam combining unit.

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