JP2000101464A - Signal receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a signal receiver where a transmission loss of a local oscillation signal of a signal reception section is reduced, when a plural signal reception section receives the transmission radio wave of a same signal source and the received signal is converted into a utilizing signal. SOLUTION: This signal receiver is provided with signal reception sections 21-2n that receive radio waves by using an array antenna 1 and convert the received signal into a utilizing signal, and the signal reception sections 21-2n are provided with local oscillators 121-12n for producing a local oscillation signal which is controlled by a phase locked loop, frequency converters 81-8n that mix the frequency of the received signal with the frequency of the local oscillation signal, and frequency selectors 101-10n that select the utilizing signal from the frequency mixed signal. The phase reference signal reception section 2n, selected from the signal reception sections 21-2n mixes frequencies by using the phase reference local oscillation signal obtained in its phase locked loop and the other signal reception sections 21-2n-1, mix frequencies with a corrected local oscillation signal which results from applying phase correction to the local oscillation signal obtained in self phase-locked loops.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal receiving apparatus for an array antenna, and more particularly, to receiving a radio wave transmitted from the same signal source for each antenna element of the array antenna and converting the frequency of each received signal. The present invention relates to a signal receiving device including a plurality of signal receiving units that generate an intermediate frequency (IF) signal and a baseband (BB) signal.

[0002]

2. Description of the Related Art Conventionally, in a radio wave detecting device for detecting an arrival direction of a signal radio wave, a signal receiving device includes an array antenna including a plurality of antenna elements and a plurality of signal receiving devices respectively connected to the plurality of antenna elements. And parts. In this radio wave detection device, radio waves transmitted from the same signal source by an array antenna are received by each of a plurality of antenna elements and a signal reception unit, and each of the received signals is frequency-converted by each of a plurality of signal reception units, and an IF signal And BB signals are generated, the BB signals obtained for each antenna element are analyzed, and the arrival direction of the radio wave is detected.

Here, FIG. 6 is a schematic configuration diagram showing an example of a signal receiving device of a known radio wave detecting device, and is a block diagram showing components relating to a plurality of signal receiving units for outputting BB signals.

[0004] As shown in FIG.
An array antenna 61 having (plural) antenna elements 61 _{1 to} 61 _n , first to n-th signal receiving units 62 _{1 to} 62 _n, and first to n-th signal receiving units
Local oscillator 63 common to the signal receiving units 62 _{1 to} 62 _n
And a signal distributor 76.

[0005] First signal receiving section 62₁Is the radio frequency (R
F) Signal input terminal 64₁And the RF bandpass filter 65
₁And the RF amplifier 66₁And the frequency mixer 67₁And the steps
Signal amplifier 68₁And a low-pass filter (LPF) 6
9₁And the buffer amplifier 70 ₁And the BB signal output terminal 7
1₁And the local oscillation signal input terminal 72₁Consists of
You. N-th signal receiving unit 62_nIs a first signal receiving unit 62
₁Having the same configuration as that of the RF signal input terminal 64._nAnd R
F band pass filter 65_nAnd the RF amplifier 66_nAnd Zhou
Wave number mixer 67_nAnd the interstage signal amplifier 68_nAnd LPF
69_nAnd the buffer amplifier 70_nAnd a BB signal output terminal
71_nAnd the local oscillation signal input terminal 72_nConsists of
You. In addition to the above, other signal receiving devices not shown in FIG.
Shinbe 62_TwoTo 62_n-1Also, the first signal receiving unit 62₁And
N-th signal receiving unit 62_nIt has the same configuration as.

The local oscillator 63 is a voltage controlled oscillator (VC
O) 73, a phase locked loop (PLL) 74, and a frequency stabilized oscillator 75. The signal distributor 76 has an input terminal connected to the output terminal of the local oscillator 63,
A plurality of output terminals correspond to the local oscillation signal input terminals 72 of the _{first to} n-th signal receiving units 62 _{1 to} 62 _{n.
1 to} 72 _n respectively.

In this case, the first to n-th signal receiving sections 62 _{1 to} 62 ₁ in the known signal receiving apparatus.
As shown by the dotted line in FIG. 6, 2 _n is unitized so that operation interference does not occur between the _{first to} n-th signal receiving units 62 _{1 to} 62 _n , and is electrically connected. It is isolated. For example, the first to n-th signal receiving units 62 _{1 to} 62 _n include the RF band-pass filter 6.
5 ₁ to 65 _n, RF amplifier 66 ₁ to 66 _n, frequency mixer 67 ₁ to 67 _n, interstage signal amplifier 68 ₁ to 6
8 _n , LPF 69 _{1 to} 69 _n , buffer amplifier 70 ₁
To 70 _n are respectively housed in the corresponding metal chassis, and the RF signal input terminals 64 _{1 to} 64 _n , the BB signal output terminals 71 _{1 to} 71 _n , and the local oscillation signal input terminals 72 _{1 to} 72 _n are derived from the metal chassis. Are arranged as follows.

[0008] The known signal receiving device having the above configuration operates as follows.

The array antenna 61 captures radio waves transmitted from the same signal source at the _n antenna elements 61 _{1 to} 61 _n , and receives first to n-th signal receiving units 62 _{1 to} 62 ₁ as received signals, respectively. 62 _n corresponding RF
It is supplied to signal input terminals 64 _{1 to} 64 _n .

In the local oscillator 63, the VCO
The oscillation signal f _{vco of} 73 and the frequency stabilization signal (reference signal) f _ref of the frequency stabilization oscillator 75 are supplied to the PLL 74. The PLL 74 repeats the counting of the oscillation signal f _vco and the reference signal f _ref by a built-in counter (not shown) to divide the signal frequency. Each time the count value reaches a predetermined value, the signal level is increased. It generates inverted pulse-like frequency-divided signals U _vco and U _ref , respectively. Then, the phases of the frequency- _divided signals U _vco and U _ref are compared, and a control voltage V _c proportional to the phase difference between the signals U _vco and U _ref is generated and supplied to the VCO 73. at the same time,
The PLL 74 divides the pulse signal having a high level during the counting of the reference signal f _ref into a low level L immediately after the count value reaches a predetermined value. Output as signal f _o . VCO73
The frequency of the oscillation signal f _vco is stabilized by the supplied control voltage V _c . The oscillation signal f of the VCO 73
_vco is distributed to n local oscillation signals of equal power in the signal distributor 76, and the local oscillation signal input of the _{first to} n-th signal receiving units 62 _{1 to} 62 _n is used as a common local oscillation signal. It is supplied to the terminals 72 ₁ to 72 _n.

In this case, the oscillation signal f of the VCO 73
_vco is an RF signal similar to the received signal, but the reference signal f _ref of the frequency stabilized oscillator 75 is
It is a pulse-like signal with a considerably lower frequency than _vco ,
For example, a signal having a low frequency of about several MHz to several tens MHz can be used. Note that a temperature-compensated crystal oscillator or the like having high frequency stability is used as the frequency stabilized oscillator 75.

When the received signal is supplied to the RF signal input terminal 64 ₁ , the first signal receiving section 62 ₁ removes unnecessary frequency components by the RF band-pass filter 65 ₁ , and the RF amplifier 66 ₁ To be amplified. In the frequency mixer 67 ₁ , the amplified reception signal and the local oscillation signal supplied from the local oscillation signal input terminal 72 ₁ via the buffer amplifier 70 ₁ are frequency-mixed, and the mixed signal is mixed in the interstage signal amplifier 68 ₁ . The signal is amplified. Then, L
In PF69 _1, unnecessary frequency components other than the BB signal in the amplified mixed signal is removed, BB signal BB
Is output from the signal output terminal 71 _1.

[0013] Also in the signal receiving unit 62 ₂ to 62 _n of the other of the second signal receiving unit to the n, is performed first signal receiving unit 62 _first operates in exactly the same manner as the operation described above, the corresponding BB signal output terminals 71 _{2 to} 71 _n
A signal is output.

In this case, since the local oscillation signal output from the local oscillator 63 is the same RF signal as the reception signal as described above, the transmission of the local oscillation signal is performed using an RF transmission line suitable for transmitting the RF signal. And a signal distributor 76 suitable for distributing the RF signal. That is, between the output terminal of the local oscillator 63 and the input terminal of the signal distributor 76, and between each output terminal of the signal distributor 76 and the first to n-th signal receiving units 62 _{1 to} 62 _n . between the local oscillation signal input terminal 72 ₁ through 72 _n is coupled via a RF transmission line. By performing such a connection, the first to n-th signal receiving units 62 _{1 to} 62 _n provide the local oscillation signal output terminals 72 _{1 to} 72 _n with the local oscillation signal output from the local oscillator 63. The signal is supplied with equal power.

At this time, the BB signals output from the BB signal output terminals 71 _{1 to} 71 _{n of the first to n-th} signal receiving units 62 _{1 to} 62 _n respectively include n antenna elements 61 Includes the arrival phase component (delay time component) of the signal radio waves captured at _{1 to} 61 _n .

The first to n-th signal receiving units 62 _{1 to} 62 _{n respectively} include an amplitude / phase component of a received signal based on the arrival state of an incoming wave (this is referred to as the former amplitude / phase component), First to n-th signal receiving units 6
A BB signal including an amplitude-phase component (referred to as the latter amplitude-phase component) based on variation in characteristics inside the signal receiving device, such as 2 _{1 to} 62 _n , is output to a BB signal output terminal 71 ₁
To 71 _n . Among these, the latter amplitude / phase component is a difference in relative characteristics between the _n antenna elements 61 _{1 to} 61 _n and a relative difference between the first to n-th signal receiving units 62 _{1 to} 62 _n. It is based on the difference of the characteristic. In addition to this, the latter amplitude and phase components are determined by the distribution characteristics of the signal distributor 76 and the output terminals of the signal distributor 76 and the first terminal.
Signal receiving unit to the is based on the differences in relative characteristics of the RF transmission line is connected between the local oscillation signal input terminal 72 ₁ through 72 _n of the signal receiving unit 62 ₁ to 62 _n of the n.
Such relative differences in characteristics are caused by the arrangement of the _n antenna elements 61 _{1 to} 61 _n , the configuration of the first to n-th signal receiving units 62 _{1 to} 62 _n , and the setting of the connection state thereof. Therefore, the characteristic difference can be measured in advance, and calibration data for correcting the characteristic difference can be prepared. When the received signal arrives, the _{first to} n-th signal receiving units 62 _{1 to} 62 _n use the calibration data to output the BB signal output terminals 71 _{1 to} 71 _n.
By relative correcting the amplitude and phase of the BB signals respectively output from the BB signals, only the former amplitude and phase components in each BB signal can be extracted.

If the phase component (time component) of the BB signal thus obtained is searched, the arrival phase component (delay time component) of the signal radio wave can be obtained, and the arrival direction of the signal radio wave is detected. be able to.

[0018]

As described above, the known signal receiving apparatus uses the signal distributor 76 for RF signals for distributing the local oscillation signal, and also uses the signal distributor 76 for distributing the signal to the output terminal of the local oscillator 63. Between the input end of the distributor 76 and the signal distributor 76
Output terminals and the first through n-th signal receiving units 6
2 _{1 to} 62 _n local oscillation signal input terminals 72 _{1 to} 7
It is necessary to use an RF transmission line whose impedance is matched between _2n .

RF used in the known signal receiving apparatus
Transmission line, when connecting pull turn in between the output terminals of the local oscillation signal input terminal 72 ₁ through 72 _n and the RF signal splitter 76, the transmission loss of the local oscillation signal is generated, the phase noise Increase. When a BB signal is obtained by using a local oscillation signal including such phase noise, the signal component in the BB signal relatively decreases and the noise signal component increases. However, there is a problem that accurate detection cannot be easily performed.

Each of the signal distributors 76 used in the known signal receiving apparatus includes n antenna elements 6.
When the number of uses of 1 _{1 to} 61 _n and the number of use of the first to n-th signal receiving units 62 _{1 to} 62 _n increase, the structure becomes large and the cost increases by the increase in the number. Problem.

The present invention solves such a problem, and an object of the present invention is to receive radio waves transmitted by the same signal source by a plurality of signal receiving units and convert the received signals into usable signals. In this case, an object of the present invention is to provide a signal receiving device capable of reducing transmission loss of a local oscillation signal supplied to a plurality of signal receiving units.

[0022]

In order to achieve the above object, a signal receiving apparatus according to the present invention comprises: a local oscillator for generating a local oscillation signal whose phase is controlled by a phase locked loop; A frequency converter for frequency-mixing the signal and the local oscillation signal; and a frequency selector for selecting an available signal from an output mixed signal of the frequency converter, wherein one of the signal receiving units is a phase reference signal. Select the receiver,
The phase reference signal receiving unit supplies the phase reference local oscillation signal obtained in its own phase locked loop to its own frequency converter to perform frequency mixing, and each signal receiving unit other than the phase reference signal receiving unit Means for supplying a corrected local oscillation signal obtained by phase-correcting the phase of the local oscillation signal obtained in the phase locked loop to the phase of the phase reference local oscillation signal to its own frequency converter to perform frequency mixing. I do.

According to the above-mentioned means, since each signal receiving section is provided with a phase locked loop and a local oscillator, R
The length of the RF transmission line used when supplying the F-band local oscillation signal from the local oscillator to the frequency converter can be minimized, and the transmission loss of the local oscillation signal due to the RF transmission line can be reduced.
The transmission loss in the RF transmission line of the known signal receiving unit can be significantly reduced.

In this case, the local oscillation signal used in each signal receiving section is such that the phase reference signal receiving section outputs the phase reference local oscillation signal, and the signal receiving sections other than the phase reference signal receiving section output the phase reference local oscillation signal. Since the corrected local oscillation signal corrected to be synchronized is used, the frequencies of the local oscillation signals of all the signal receiving units can be matched, and each of the signal receiving units receives the frequency of the local oscillation signal when receiving an incoming radio wave. It is not affected by fluctuations.

In the above-mentioned means, if the reference signal having a frequency stabilized at a frequency considerably lower than that of the RF signal is distributed and supplied to the phase locked loop of each signal receiving section, The signal can be distributed by branching the signal line, so that a signal distributor for an RF signal used in a known signal receiving device is not required, and further, it is not necessary to use an RF transmission line for transmitting a reference signal.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In an embodiment of the present invention, a signal receiving apparatus receives a signal radio wave using an array antenna having a plurality of antenna elements, and converts a received signal into a usable signal. A signal receiving unit, wherein each of the signal receiving units includes at least a local oscillator that generates a local oscillation signal whose phase is controlled by a phase locked loop, and a frequency converter that mixes the frequency of the received signal and the local oscillation signal. And a frequency selector for selecting an available signal from the output mixed signal of the frequency converter, and selecting one of the signal receiving units as a phase reference signal receiving unit, The phase reference local oscillation signal obtained in its own phase locked loop is supplied to its own frequency converter to perform frequency mixing, and each of the signal receiving units other than the phase reference signal receiving unit receives its own signal. A phase-corrected local oscillation signal obtained by phase-correcting the phase of the local oscillation signal obtained by the phase-locked loop so as to be synchronized with the phase of the reference local oscillation signal is supplied to its own frequency converter to perform frequency mixing. .

In one specific example of the embodiment of the present invention,
The signal receiving device includes a phase comparator coupled to a phase locked loop in which each signal receiving unit other than the phase reference signal receiving unit controls the phase of the local oscillation signal, and a signal number adjuster. A phase difference signal is generated by comparing the phase of the frequency-divided reference signal obtained in the loop with the phase-reference frequency-divided reference signal obtained in the phase-locked loop of the phase reference signal receiving unit, and the signal number adjuster controls each signal. The reference signal supplied from the common frequency stabilizing oscillator to the signal receiving unit is adjusted for the number of reference signals in accordance with the phase difference signal, and this signal number adjustment reference signal is supplied to the phase locked loop.

In a modification of the specific example of the embodiment of the present invention, the signal receiving apparatus includes a phase comparator and a signal, wherein the phase reference signal receiving section is coupled to a phase locked loop for controlling the phase of the phase reference local oscillation signal. A number adjuster, wherein the phase comparator and the signal number adjuster always supply the reference signal supplied from the frequency stabilizing oscillator common to each signal receiving section to the phase locked loop.

In these embodiments of the present invention, the signal receiving apparatus receives a radio wave transmitted from the same signal source by an array antenna composed of a plurality of antenna elements, and receives a received signal from a baseband (BB) signal. Has a plurality of signal receiving units, each signal receiving unit, at least,
A local oscillator that generates a local oscillation signal phase-controlled by a phase locked loop, a frequency converter that mixes the frequency of the received signal and the local oscillation signal, and a frequency that selects an available signal from the output mixed signal of the frequency converter And a selector, wherein one of the signal receiving units is selected as a phase reference signal receiving unit, and the frequency converter of the phase reference signal receiving unit is obtained by its own phase locked loop. The frequency mixing is performed using the oscillation signal, and the frequency converter of each signal receiving unit other than the phase reference signal receiving unit is obtained in its own phase locked loop, and the phase of the local oscillation signal is changed to the phase of the phase reference local oscillation signal. Frequency mixing is performed using a corrected local oscillation signal whose phase has been corrected so as to be synchronized.

Therefore, a local oscillation signal having the same frequency as the frequency of the phase reference local oscillation signal supplied to the frequency converter of the phase reference signal receiving section is always supplied to the frequency converter of each signal receiving section. . At this time, if the amplitude and phase of the BB signals output from the respective signal receiving units are relatively corrected by the calibration data used in the known signal receiving apparatus of this type, the output signals are output from the respective BB signal output terminals. BB signal is the arrival phase component (delay time component) of the radio wave
, A phase component based on a difference in relative characteristics between a plurality of antenna elements and a difference in characteristics between a plurality of signal receiving units is not included. When this signal receiving device is used for a radio wave detecting device, the arrival phase component (delay time component) of the signal radio wave is obtained by searching for the phase component (time component) of the obtained BB signal, and the obtained signal radio wave is obtained. The arrival direction of the signal wave can be detected from the arrival phase component (delay time component).

According to these embodiments of the present invention, since each signal receiving section includes a phase locked loop and a local oscillator, the local oscillation signal in the RF band is converted from the local oscillator to the frequency converter. The length of the RF transmission line used to supply the signal to the RF transmission line can be reduced as much as possible.
The transmission loss can be significantly reduced as compared with the transmission loss in the transmission line.

Further, according to these embodiments of the present invention, a reference signal (frequency stabilizing signal) having a considerably lower frequency than the RF signal is distributed and supplied to the phase locked loop of each signal receiving section. Since the reference signal can be distributed by branching the signal line, the signal distributor for the RF signal used in the known signal receiving device becomes unnecessary, and the RF transmission line is used for transmitting the reference signal. There is no need to use it.

[0033]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of a signal receiving apparatus according to the present invention.
FIG. 2 is a block diagram illustrating a schematic configuration of an embodiment and illustrating components related to a plurality of signal receiving units.

The signal receiving apparatus of the first embodiment shows an example in which the n-th signal receiving section 2 _n is selected as a phase reference signal receiving section.

As shown in FIG. 1, a signal receiving apparatus of the first embodiment, n and the array antenna 1 having a (plurality) of antennas elements 1 ₁ to 1 _n, the first signal receiving unit to the n It comprises a signal receiver 2 ₁ 2 _n, and one of the frequency-stabilized oscillator 3, and one control unit (CPU) 4.

[0037] The first signal receiver 2 ₁ not selected phase reference signal receiving unit includes a radio frequency (RF) signal input terminals 5 _1, an RF band pass filter _61, an RF amplifier _71, the frequency a mixer _81, an interstage signal amplifier 9 _1,
A low-pass filter (LPF) 10 _1, a baseband (BB) signal output terminal 11 _1, the voltage controlled oscillator (VC
O) 12 ₁ , phase locked loop (PLL) 13 ₁ , phase comparator 14 ₁ , and AND gate (signal number adjuster) 15
₁ , a reference signal input terminal 16 ₁ , a frequency-divided reference signal input terminal 17 _1, and a clear signal input terminal 18 ₁ .

Further, the phase reference signal received the second signal receiving unit to the signal receiving portion of the n-1 which are not selected portion 2 ₂ to 2
_n-1 (not shown in FIG. 1) has the same configuration as the _first signal receiving unit 21.

On the other hand, the n-th signal receiving section 2 _n selected as the phase reference signal receiving section has the RF signal input terminal 5
_n , an RF bandpass filter 6 _n, and an RF amplifier 7
_n , frequency mixer 8 _n , interstage signal amplifier 9 _n , L
PF 10 _n , BB signal output terminal 11 _n , VCO 12
_n , a PLL 13 _n , a reference signal input terminal 16 _n, and a frequency-divided reference signal output terminal 19 _n .

That is, the n-th signal receiving section 2 _n includes the phase comparators 14 _{1 to} 14 _n−1 and the AND gates 15 _{1 to} 15
that it does not include the component corresponding to the _n-1, and, provided with a terminal corresponding to the frequency division of the reference signal input terminal 17 ₁ to 17 _n-1 and the clear signal input terminal 18 ₁ to 18 _n-1 though not the point, it, in that the reference of divided signal output terminal 19 _n separately provided, the first signal receiving unit through the first n-1 of the signal receiver 2 ₁ 2 _n-1 configuration different ing.

In this case, the array antenna 1 having _n antenna elements 11 _{1 to} 1 _n in the signal receiving apparatus of the first embodiment has n antenna elements 61 _{1 to} 61 _n in the known signal receiving apparatus. is of the same configuration as the array antenna 61, RF band-pass filter ₆₁ in the signal receiving apparatus of the first embodiment, RF amplifier _71, a frequency mixer 8 _1, interstage signal amplifier 9 _1, LPF 10 ₁ is
An RF bandpass filter 65 ₁ , an RF amplifier 66 ₁ , and a frequency mixer 6 in a known signal receiving device, respectively.
7 ₁ , the same configuration as the inter-stage signal amplifier 68 ₁ and the LPF 69 _1, and the RF in the signal receiving apparatus of the first embodiment.
The band-pass filter 6 _n , the RF amplifier 7 _n , the frequency mixer 8 _n , the interstage signal amplifier 9 _n , and the LPF 10 _n include an RF band-pass filter 65 _n , an RF amplifier 66 _n ,
Frequency mixer 67 _n , interstage signal amplifier 68 _n , LPF 6
It is of the same configuration as 9 _n.

Here, in the signal receiving device of the first embodiment, the reference signals of the _{first to} n-th signal receiving units 21 to 2 _n are output from the output terminal of one frequency-stabilized oscillator 3. to the input terminal 16 ₁ through 16 _n, several MHz to several 10
A pulse-shaped frequency stabilizing signal having a low frequency of about MHz is distributed and supplied as a reference signal. Therefore, it is not necessary to use an RF transmission line or a signal distributor for RF signals to distribute and supply the reference signal. For example, it is sufficient to branch and connect a general-purpose signal line. Similarly, the first to n-th signal receiving units
During the signal reception unit of -1 2 ₁ to division of the reference signal of 2 _n-1 input terminals 17 ₁ to 17 _n-1 and the division of the reference signal output terminal 19 _n of the signal receiver 2 _n of the n and, between the first signal receiving unit to the output terminal of the (n-1) of the signal receiver 2 ₁ 2 _n-1 of the clear signal input terminal 18 ₁ to 18 _n-1 and one control unit 4 Also, the connection is obtained by branching a general-purpose signal line.

In this case, the frequency stabilized oscillator 3 in the signal receiving device of the first embodiment has the same configuration as the frequency stabilized oscillator 75 in the known signal receiving device.

Next, FIG. 2 is a circuit diagram showing an example of the phase comparator 14 ₁ configuration used in the signal reception device of the first embodiment shown in FIG. 1, FIG. 3 is shown in FIG. 2 a signal waveform diagram in the operating conditions of the phase comparator 14 _1, Figure 3
The signals shown in FIG. 2 are the signals obtained in the places shown in FIG.

In the signal receiving apparatus of the first embodiment, the other phase comparators 14 _{2 to} 14 _n−1 are also the phase comparators 1.
4 are of ₁ and the same configuration, the phase comparator 1 is also the operation
Is the same as 4 ₁ of operation, following the phase comparator 14 ₁
And only the other phase comparators 14 _{2 to} 1
Description of 4 _n-1 is omitted.

[0046] As shown in FIG. 2, the phase comparator 14 _1,
A first inverter 20, a second inverter 21, and a first flip-flop (F / F) 22 having a negative logic clear terminal
A second F / F 23 with a negative logic clear terminal, a third F / F 24 with a negative logic clear terminal, a fourth F / F 25 with a negative logic clear terminal, a two-channel multiplexer 26 with a negative logic enable terminal, A self-divided reference signal input terminal 27, an outer partially divided reference signal input terminal 28,
It comprises a phase difference signal output terminal 29 and a negative logic clear signal input terminal 30.

[0047] In the first signal receiving unit 2 _1, the self-division of the reference signal input terminal 27 of the phase comparator 14 (E) is
The frequency-divided reference signal (f _o ) of the PLL 13 ₁ is supplied, and the external partially frequency-divided reference signal input terminal 28 (R) is connected to the frequency-divided reference signal input terminal 17 ₁ . Phase difference signal output terminal 29
(G) is connected to one input terminal of the AND gate 15 _1. The other input terminal of the AND gate 15 ₁ is connected to the reference signal input terminal 16 _1, the output PLL 13 ₁
As a reference signal (f _ref ). The negative logic clear signal input terminal 30 (CLR) is connected to the clear signal input terminal 18
Connected to ₁ .

Here, the operation of the signal receiving apparatus according to the first embodiment having the above configuration will be described with reference to FIGS.

[0049] RF 1 _n is 1 ₁ to the antenna elements, which captures the radio wave transmitted from the same signal source, corresponding to the first signal receiving unit to the signal receiving unit 2 ₁ 2 _n of the n respectively
Supplied as a reception signal the signal input terminal 5 to ₁ to 5 _n.
At this time, stabilized frequency oscillator 3 supplies a frequency-stabilized signal as a reference signal to a reference signal input terminal 16 ₁ through 16 _n of the first signal receiving unit to the signal receiving unit 2 ₁ 2 _n of the n. For this reason, as will be described later, the frequency mixer 8 of the _{first to} n-th signal receiving units 21 to 2 _{n
1 to} 8 _n are supplied with a corrected local oscillation signal whose phase is synchronized.

The first signal receiving unit 2 _1, the received signal is supplied to the RF signal input terminal 5 _1, removes unnecessary frequency components in the RF band pass filter _61, the required level by the RF amplifier 7 ₁ Amplify up to. Next, the frequency mixer 8 ₁
The frequency of the received signal and the corrected local oscillation signal amplified in step ( ₁₎ are mixed, and the interstage signal amplifier 91 amplifies the frequency mixed signal.
Thereafter, it removes unnecessary frequency components other than the BB signal in the frequency mixing signal in LPF 10 _1, and supplies the obtained BB signal to the BB signal output terminal 11 _1.

[0051] Further, another signal receiving unit, i.e., in the signal receiving unit 2 ₂ to 2 _n of the second signal receiving unit to the n,
Operation exactly the same operation for the first signal receiving unit 2 ₁ of the received signal described above is performed, the corresponding BB signal output terminal 11
_A BB signal is supplied to each of _{2 to} 11 _n .

By the way, the first signal receiving unit 2 _first through n
In the signal receiving section _2n , a corrected local oscillation signal with phase synchronization is generated as follows.

First, in the n-th signal receiving section 2 _n selected as the phase reference signal receiving section, the VCO is supplied by the reference signal supplied from the frequency stabilizing oscillator 3 to the PLL 13 _n.
The frequency of the phase reference local oscillation signal generated by the phase control loop including 12 _n and the PLL 13 _n is stabilized and supplied to the frequency mixer 8 _n .

At this time, the PLL 13 _n includes the VCO 12
_{The n} local oscillation signal f _vco and the reference signal f _ref of the frequency stabilizing oscillator 3 are supplied. The PLL 13 _n repeatedly counts the oscillation signal f _vco and the reference signal f _ref by a built-in counter (not shown) to divide the frequency of those signals, and their count values reach predetermined values, respectively. Each time, a pulse-shaped frequency-divided signal U _vco and U _ref whose signal level is inverted are generated. And PL
L13 _n compares the phases of these frequency-divided signals U _vco and U _ref to generate a frequency control voltage V _c proportional to the phase difference, and supplies it to VCO 12 _n . At the same time, PLL13
_n is a high level H while the reference signal f _ref is being counted, and immediately after the count value reaches a predetermined value, a pulse-like signal that becomes low level L instantaneously is a frequency-divided reference signal. Output as f _o . VCO 12 _n, the frequency of the local oscillation signal f _vco is stabilized by the supplied frequency control voltage V _c.

On the other hand, the other signal receiver which is not selected to the phase reference signal receiving unit, for example, in the first signal receiving unit 2 _1, reference from a stable frequency oscillator 3 signal input terminal 1
By 6 ₁ and the AND gate 15 the reference signal supplied to the ₁ through PLL 13 _1, VCO 12 ₁ and PLL 13
Frequency of the local oscillation signal generated by the phase control loop including ₁ and is stabilized, is fed to the frequency mixer 8 _1.

[0056] The signal reception unit 2 ₂ to 2 _n-1 of the second signal receiving unit to the (n-1), similarly to the first signal receiving unit 2 _1, is generated from the corresponding phase control loop local oscillation signal is stabilized, the corresponding frequency mixer 8 _2-8
n-1 . In this case, in the PLL 13 _1, substantially the same operation is performed with the PLL 13 _n.

As described above, the known signal receiving apparatus includes each signal receiving unit among the BB signals output from the _{first to} n-th signal receiving units 62 _{1 to} 62 _n. Since the amplitude and phase components based on the variation in the characteristics inside the units 62 _{1 to} 62 _n are included, each BB signal is obtained by using calibration data obtained by measuring each BB signal obtained at the time of receiving an incoming radio wave in advance. Needs to be corrected.

In the signal receiving apparatus of the first embodiment as well, it is necessary to correct the amplitude and phase components of each BB signal using the calibration data. However, when the calibration data is obtained and when the incoming radio wave is received, each signal must be corrected. It is necessary to ensure the reproducibility of the phase of the local oscillation signal. Therefore, the first
In the signal receiving apparatus embodiment, the phase of the phase reference signal receiver 2 the signal reception unit 2 ₁ other than _n 2 _n-1 of the local oscillation signal to the phase of the phase reference signal receiving unit 2 _n local oscillation signal It is those for synchronizing, in each signal receiver 2 ₁ 2 _n-1 other than the phase reference signal receiving unit 2 _n Therefore, the phase comparator 14 ₁ to 14 _n-1 and the aND gate 15 ₁ to 1
5 _n-1 are provided.

The operation for synchronizing the phases of the local oscillation signals will be described with reference to FIG.

First, during the period from time t _{0 to} t ₁ , that is, the period immediately after the start of the operation of the signal receiving apparatus and the phases of all the local oscillation signals are not yet phase-synchronized, the signal waveform is shown. As shown in FIG.
Is supplied with the outer reference signal obtained by the n-th signal receiving unit 2 _n . On the other hand, as shown in the signal waveform, the self-divided reference signal is supplied to the self-divided reference signal input terminal 27. At this time, the second inverter 21 converts the external partial frequency reference signal into a second negative logic pulse as shown in the signal waveform, and the first inverter 20 generates the self-frequency-divided reference signal as shown in the signal waveform. Convert the signal to a first negative logic pulse. The second F / F 23, as shown in the signal waveform,
In response to the negative logic pulse, a second square wave signal is output to the negative logic output terminal Q, and the first F / F 22 responds to the first negative logic pulse as shown in the signal waveform. The first square wave signal is output to the output terminal Q. In this case, the time t
During the period from _{0 to} t ₁ , as shown in the signal waveforms, the phases of the externally-divided reference signal and the self-divided reference signal, and the phases of the first negative logic pulse and the second negative logic pulse, Also not synchronized.

[0061] Then at time t _1, the control unit 4, as shown in signal waveform, a 4F / F25 through the clear signal input terminal 18 ₁ and the negative logic clear signal input terminal 30
, A negative polarity clear signal is supplied to the negative logic clear terminal CLR. At this time, the positive logic output terminal Q of the fourth F / F 25
Is in a clear state and outputs a signal of negative polarity.
/ F24 to the delay input terminal D.

In the period from time t _{1 to} time t ₂ , following the period from time t _{0 to} t ₁ , as shown in the signal waveforms, the externally divided reference signal and the self-divided reference signal , And the phases of the first negative logic pulse and the second negative logic pulse are not synchronized.

Next, at time t ₂ , the third F / F2
4 generates a negative polarity signal at the positive logic output terminal Q in response to the rising edge of the first square wave signal (waveform) as shown in the signal waveform, and generates a signal at the negative logic enable terminal EN of the fifth F / F 26. Supply. As a result, the output (waveform) of the multiplexer 26 becomes controllable.

In the subsequent period from time t _{2 to} time t ₃ , following the period from time t _{1 to} time t ₂ , as shown in signal waveforms, the divided reference signal and the self-divided reference signal The phase and the phases of the first negative logic pulse and the second negative logic pulse are not synchronized.

Subsequently, at time t ₃ , as shown in the signal waveform, the multiplexer 26 responds to the falling edge of the first square wave signal (waveform) by outputting a negative phase difference signal to the output terminal Y. appear. At the same time, the phase difference signal is
It is supplied to the phase difference signal output terminal 29 and the input terminal of the fourth F / F 25.

At this time, the phase difference signal is supplied from the phase difference signal output terminal 29 (G) to the AND gate 1 as shown in FIG.
5 is supplied to one input terminal of the _1. AND gate 15 ₁
Stops during the transmission of the reference signal supplied from the frequency-stabilized oscillator 3 to the reference signal input terminal 16 ₁ and the AND gates 15 ₁ through PLL 13 ₁ negative polarity phase difference signal is supplied.

[0067] Since the time t ₃ to time period of t ₄ after this, which is supplied phase difference signal to the AND gates 15 _1, a period of the transmission stop of the reference signal, the reference signal to the PLL 13 ₁ is not supplied, PLL 13 dividing function of the reference signal (pulse count by the counter) is stopped in _one.

At the same time, the period from time t _{3 to} time t ₄ follows the period from time t _{2 to} time t ₃ , as shown in the signal waveforms. The state in which the phase and the phases of the first negative logic pulse and the second negative logic pulse are not synchronized with each other continues.

Next, at time t ₄ , as shown in the signal waveform, the multiplexer 26 responds to the rising edge of the second square wave signal (waveform) and outputs the negative phase difference signal from the output terminal Y. Stop output.

The period from time t _{4 to} time t ₅ follows the period from time t _{3 to} time t ₄ , and as shown in the signal waveforms, the externally divided reference signal and the self-divided reference signal , And the state in which the phases of the first negative logic pulse and the second negative logic pulse are not synchronized.

Next, at time t ₅ , the signal waveform
As shown in dotted line, originally, it is supplied a reference signal a period of time t ₄ to t _5, whereby the self-division of the reference signal is supplied to the self-division of the reference signal input terminal 27, a first inverter 20 from is a timing in which the first negative logic pulse is output, the negative polarity period of the transmission stop of the reference signal by the supply of the phase difference signal to the aND gate 15 _1, PLL
By dividing the function of the reference signal in the 13 ₁ is stopped, the self-division of the reference signal is not supplied to the self-division of the reference signal input terminal 27. For this reason, the first inverter 20 does not output the first negative logic pulse, and the first square wave signal output from the negative logic output terminal Q of the first F / F 22 does not rise as shown in the signal waveform. . And time t ₅
State of each signal is directly persists at time t ₅ to time period of t ₆ in.

Subsequently, at time t ₆ , as shown in the signal waveforms, the signal P during the period from time t _{3 to} t ₄
LL13 dividing function of the _first reference signal is based on the stopped a predetermined period, a state in which phases are synchronized for all of the local oscillation signal.

Then, during the period after time t ₆ , as shown in the signal waveforms, the phase of the frequency-divided reference signal and the self-frequency-divided reference signal, and the phase of the first negative logic pulse and the second negative logic pulse The phases are maintained in a synchronized state. As a result, the frequency division function of the reference signal in the PLL 13 ₁ and the PLL 13 _n becomes exactly the same, and when controlled based on this state, the frequency division function of the local oscillation signal becomes exactly the same.
That is, the phases of the local oscillation signals of the local oscillator 12 ₁ and the local oscillator 12 _n are synchronized.

[0074] Incidentally, the operation of the first signal receiving unit 2 ₁ in the phase comparator 14 _1, the first signal receiving unit 2 ₁
This is an example of synchronizing the phase of the local oscillation signal between the second signal receiver and the n-th signal receiver 2 _n to the n-th signal receiver 2 _{2 to} 2 _n-1. And the n-th
The phase of the local oscillation signal with the signal receiving unit 2 _n can be similarly synchronized by passing through exactly the same process.

According to the signal receiving apparatus of the first embodiment, one of the plurality of signal receiving sections 2 _{1 to} 2 _n has one signal receiving section 2 _n.
Is selected as the phase reference signal receiving section, and the frequency converter 8 _n in the selected phase reference signal receiving section 2 _n performs frequency mixing using the phase reference local oscillation signal obtained from its own phase locked loop. the frequency converter 8 in the phase reference signal receiving unit 2 the signal receiving unit other than _n 2 ₁ to 2 _{n-1 1}
To 8 _n-1 perform frequency mixing using a corrected local oscillation signal whose phase has been corrected so as to synchronize the phase of the local oscillation signal output from its own phase locked loop with the phase of the phase reference local oscillation signal, in the frequency converter ₈₁ to 8 _n of each signal receiver 2 ₁ 2 _n-1, of the local oscillation signal supplied to the frequency converter 8 _n of the signal receiver 2 _n as a phase reference signal receiver phase And a local oscillation signal having the same phase as that of the local oscillation signal.

By the above-mentioned operation, reproducibility of the phase of the local oscillation signal at the time of acquiring the calibration data and at the time of receiving the incoming wave can be ensured, and the corrected BB signal obtained by using the acquired calibration data can be obtained. Can be accurately detected by analyzing the direction of arrival of the signal radio wave.

Next, FIG. 4 shows a schematic configuration of a second embodiment of the signal receiving apparatus according to the present invention, and is a block diagram showing components related to a plurality of signal receiving units.

In the signal receiving apparatus of the second embodiment, an example is shown in which the n-th signal receiving section 2 _n is selected as the phase reference signal receiving section.

The difference between the configuration of the second embodiment and the first embodiment shown in FIG. 1 is that there is no difference in the configuration between the second embodiment and the first embodiment except for the following points. Absent.

[0080] That is, for each signal receiver 2 ₁ 2 _n-1 is not selected in the phase reference signal receiving unit to the first embodiment comprises a phase comparator 14 ₁ to 14 _n-1, respectively against, that it comprises second embodiment of a similar configuration to the phase comparator 14 ₁ to 14 _n-1 phase comparator 14 _'1 to 14' _n-1, respectively, and, the second embodiment is the Frequency-divided reference signal output terminals 19 _{1 to} 1 not provided in one embodiment
It is that it comprises a 9 _n-1 and the preset signal output terminal 31 ₁ to 31 _n-1.

In the n-th signal receiving section 2 _n selected as the phase reference signal receiving section, the first embodiment does not include a phase comparator and an AND gate,
And includes a phase comparator 14 _'n of the embodiment the phase comparator 14' ₁ to 14 _'n-1 in the same configuration, the AND gate 15 _n of the same structure as AND gates 15 ₁ to 15 _n-1 And that the second embodiment has a frequency-divided reference signal input terminal 17 _n , a clear signal input terminal 18 _n , and a preset signal output terminal 31 _n which are not provided in the first embodiment. is there.

In addition, as shown in FIG. 4, the connection state of the transmission line and the connection line is slightly added or changed in accordance with the change in the configuration.

In FIG. 4, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

[0084] FIG. 5 is a circuit diagram showing an example of the phase comparator 14 _'1 configuration used in the signal reception device of the second embodiment shown in FIG.

[0085] In this case, in the signal receiving device of the second embodiment, the other phase comparator 14 _'2 to 14' _n also of the same configuration as the phase comparator 14 _'1, the configuration is the same since its operation is the same as the operation of the phase comparator 14 _'1. Therefore, in the following description are omitted, 'perform only explanation for _1, the other phase comparator 14' the phase comparator 14 an explanation for ₂ to 14 _'n.

[0086] Incidentally, the difference of the configuration of a phase comparator 14 ₁ illustrated in the phase comparator 14 _'1 and 2, the 3F / F2
4, 24 with respect to 'and the 4F / F25,25', while being provided with a first 3F / F 24 to the phase comparator 14 ₁ has a negative logic clear terminal CLR respectively and the 4F / F25, the phase comparator 14 ' ₁ has a negative logic clear terminal CLR and a negative logic preset terminal PR, respectively.
/ F 24 'and the 4F / F25' that are equipped with a, whereas the phase comparator 14 ₁ is not provided with a negative logic preset signal input terminal 31 to be described later, the phase comparator 14 _'1
That There are provided a negative logic preset signal input terminal 31 connected to the preset signal output terminal 31 _1, and the negative logic preset signal is supplied to the preset signal output terminal 31 _1, the 3F by negative logic preset signal / F2
4 'and the 4F / F25' operating state of merely that it is configured to be controlled, the other, the differences in configuration between the phase comparator 14 ₁ and the phase comparator 14 _'1 There is no.

In FIG. 5, the same components as those shown in FIG. 2 are denoted by the same reference numerals, and description thereof is omitted.

The operation of the signal receiving apparatus according to the second embodiment having the above-described configuration is as follows.

Here, for the sake of simplicity, only the operation different from the operation of the signal receiving apparatus of the first embodiment will be described.

[0090] In the first signal receiving unit 2 ₁ is not selected in the phase reference signal receiving unit, and supplies a positive polarity preset signal to the preset signal input terminal 31 of the phase comparator 14 _'1. In such a state, the phase comparator 1
4 _'1, the same operation is performed with the operations performed by the phase comparator 14 ₁ described above. Also in the phase reference signal received the second signal receiving unit to the signal receiving portion of the n-1 that have not been selected in part 2 ₂ to 2 _n-1, the first signal receiving unit 2 ₁
The same operation as the operation performed in is performed.

On the other hand, in the n-th signal receiving section 2 _n selected as the phase reference signal receiving section, the phase comparator 14 ′
_{The n-state} clear signal input terminal 30 is supplied with a positive polarity clear signal, and the preset signal input terminal 31 is supplied with a negative polarity preset signal. In this state,
A positive polarity signal is always output from the positive logic output terminal Q of the third F / F 24 ', and a positive polarity phase difference signal is always output from the output terminal Y of the multiplexer 26 whose negative logic enable terminal EN is controlled by this positive signal. The positive phase difference signal is supplied to the phase difference signal output terminal 29. And in the AND gate 15 _n ,
Since the positive polarity phase difference signal is always supplied, the reference signal supplied from the frequency stabilizing pulse oscillator 3 is supplied to the PLL 13 without stopping the transmission by the AND gate 15 _n . Since the state at this time is equivalent to the state where the phase comparator 14 _n and the AND gate 15 _n are omitted, the n-th signal receiving unit 2 _{n of} the second embodiment performs the first embodiment. The same operation as the operation performed by the n-th signal receiving unit 2 _n in the example is performed.

[0092] Thus, according to the signal receiving device of the second embodiment, selects one of the signal receiver 2 _n of the plurality of signal receiving section 2 ₁ 2 _n to the phase reference signal receiving unit, select The frequency converter in the phase reference signal receiving unit _2n performs frequency mixing using the phase reference local oscillation signal obtained from its own phase locked loop, while
In the frequency converter at each signal receiver 2 ₁ 2 _n-1 other than _n, the self-phase synchronous phase correction so as to synchronize the phase of the phase reference local oscillator signal the phase of the local oscillation signal outputted from the loop since using the correction local oscillation signal and performs frequency mixing, the signal receiver 2 ₁ 2
_In the frequency converter at _n , a local oscillation signal having the same phase as the phase of the local oscillation signal supplied to the frequency converter of the phase reference signal receiving unit 2 _n is supplied, and the frequencies of all the local oscillation signals match.

As a result, the reproducibility of the phase of the local oscillation signal when the calibration data is obtained and when the incoming wave is received is ensured,
After correcting the BB signal with the acquired calibration data,
By performing a detailed analysis, it is possible to accurately detect the arrival direction of the signal radio wave.

Further, according to the signal receiving apparatus of the second embodiment, since the configuration of the phase reference signal receiving section and the other signal receiving sections are the same, the phase reference signal receiving section and the other signal receiving sections are not used. Need not be separately manufactured, and the manufacturing process is simplified.

[0095] In the first and second embodiments, a plurality of signal receiving section 2 ₁ 2 _n may be one were both unitized, there is not unitized Is also good.

[0096] In the first and second embodiments, BB signals plurality of signal receiving section 2 ₁ 2 _n is the single frequency conversion using a single frequency conversion stage 8 ₁ to 8 _n, respectively an example is shown in which to obtain a signal reception apparatus according to the present invention, a plurality of signal receiving section 2 ₁ 2
_{The present invention} is not limited to the case _where only _one frequency converter 8 _{1 to} 8 _n is used for _n. The BB signal may be obtained by the frequency conversion of the above number.

[0097] Further, in the first embodiment and the second embodiment, an example in which selects the signal receiving unit 2 _n of the n-th of the plurality of signal receiving section 2 ₁ 2 _n to the phase reference signal receiving section However, the signal receiving unit selected as the phase reference signal receiving unit in the present invention is not limited to the n-th signal receiving unit 2 _n , and may be any other than the _n-th signal receiving unit 2 _n . may be selected one of the signal receiver 2 ₁ 2 _n-1.

[0098]

As described above, according to the present invention, in the signal receiving apparatus, since the plurality of signal receiving sections each include the phase locked loop and the local oscillator, the local oscillation signal in the RF band is transmitted to the local oscillator. Can reduce the length of the RF transmission line at the time of supply to the frequency converter as much as possible.
There is an effect that the transmission loss can be significantly reduced as compared with the transmission loss of the F transmission line.

In this case, the local oscillation signals used in each signal receiving section include the phase reference local oscillation signal in the phase reference signal receiving section, and the phase reference local oscillation signal in each signal receiving section other than the phase reference signal receiving section. Since the corrected local oscillation signal corrected to be in phase is used, the frequencies of the local oscillation signals of all the signal receiving units match, and there is no effect of being affected by the frequency fluctuation or phase fluctuation of the local oscillation signal. is there.

In addition, R is added to the phase locked loop of each signal receiving unit.
Since the frequency stabilization signal having a considerably lower frequency than the F signal is distributed and supplied, the frequency stabilization signal can be distributed by the signal line branch, and the RF signal used in the known signal receiving apparatus is used. There is an effect that a distributor is not required and it is not necessary to use an RF transmission line for transmitting a frequency stabilized signal.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a first embodiment of a signal receiving apparatus according to the present invention.

FIG. 2 is a circuit diagram showing an example of a configuration of a phase comparator used in the signal receiving device shown in FIG.

FIG. 3 is a signal waveform diagram illustrating an operation state of the phase comparator illustrated in FIG. 2;

FIG. 4 is a block diagram showing a schematic configuration of a second embodiment of the signal receiving apparatus according to the present invention.

FIG. 5 is a circuit diagram showing an example of a configuration of a phase comparator used in the signal receiving device shown in FIG.

FIG. 6 is a block diagram illustrating an example of a schematic configuration of a known signal receiving device.

[Explanation of symbols]

Reference Signs List 1 array antenna 1 _{1 to} 1 _n antenna element 2 _{1 to} 2 _n signal receiving unit 3 frequency stabilizing oscillator 4 control unit 5 _{1 to} 5 _n radio frequency (RF) signal input terminal 6 _{1 to} 6 _n RF bandpass filter 7 ₁ To 7 _n RF amplifier 8 _{1 to} 8 _n frequency mixer 9 _{1 to} 9 _n interstage signal amplifier 10 _{1 to} 10 _n low-pass filter (LPF) 11 _{1 to} 11 _n baseband (BB) signal output terminal 12 _{1 to} 12 _n Voltage-controlled oscillator (VCO) 13 _{1 to} 13 _n Phase locked loop (PLL) 14 _{1 to} 14 _n-1 , 14 ′ _{1 to} 14 ′ _n Phase comparator 15 _{1 to} 15 _n AND gate 16 _{1 to} 16 _n Reference signal input terminals 17 ₁ to 17 _n frequency division of the reference signal input terminal 18 ₁ through 18 _n clear signal input terminal 19 ₁ through 19 _n division of the reference signal output terminal 20 first inverter 21 second inverter 22 first flip Flop (F / F) 23 Second flip-flop (F / F) 24, 24 'Third flip-flop (F / F) 25, 25' Fourth flip-flop (F / F) 26 Two-channel multiplexer 27 Self-division Reference signal input terminal 28 external frequency-divided reference signal input terminal 29 phase difference signal output terminal 30 clear signal input terminal 31 _{1 to} 31 _n preset signal input terminal

Claims (3)

[Claims] 1. A signal receiving apparatus comprising: a plurality of signal receiving units for receiving a signal radio wave using an array antenna having a plurality of antenna elements and converting received signals into usable signals. The receiving unit is at least
A local oscillator for generating a local oscillation signal phase-controlled by a phase locked loop, a frequency converter for frequency mixing the received signal and the local oscillation signal, and the available signal from an output mixed signal of the frequency converter And a frequency selector for selecting one of the signal receiving units as a phase reference signal receiving unit, wherein the phase reference signal receiving unit obtains a phase reference local unit obtained in its own phase locked loop. The oscillation signal is supplied to its own frequency converter to perform frequency mixing, and each of the signal receiving units other than the phase reference signal receiving unit respectively adjusts the phase of the local oscillation signal obtained in its own phase locked loop. A signal receiving apparatus for supplying a corrected local oscillation signal whose phase has been corrected so as to be synchronized with the phase of a phase reference local oscillation signal to its own frequency converter to perform frequency mixing. 2. Each of the signal receiving units other than the phase reference signal receiving unit includes a phase comparator and a signal number adjuster coupled to a phase locked loop for controlling the phase of the local oscillation signal. The phase comparator compares the phase of the frequency-divided reference signal obtained by the self-phase locked loop with the phase-reference frequency-divided reference signal obtained by the phase-locked loop of the phase reference signal receiving section to generate a phase difference signal. The signal number adjuster adjusts the number of reference signals supplied from a frequency stabilizing oscillator common to the respective signal receiving units in accordance with the phase difference signal, and adjusts the number of reference signals. The signal receiving device according to claim 1, wherein a signal is supplied to the phase locked loop. 3. The phase reference signal receiving section includes a phase comparator coupled to a phase locked loop for controlling a phase of the phase reference local oscillation signal, and a signal number adjuster, wherein the phase comparator and the signal number are controlled. The signal receiving apparatus according to claim 1, wherein the adjuster always supplies a reference signal supplied from a frequency stabilizing oscillator common to the signal receiving units to the phase locked loop.