JPS5880572A - Receiver - Google Patents

Abstract

PURPOSE:To precisely measure the phase difference of input signals without reductionof reception probability, by receiving the input signal from the external, storing the information and immediately outputting a calibration signal on the basis of frequency information to calibrate the stored information. CONSTITUTION:When an unkown signal is inputted to input terminals 1a, 1b, the signal is received by receivers 2a, 2b and its frequency information and phase information are sent to a frequency storage 30 and a phase difference detector 6 respectively. The storage 30 sends the stored frequency information to an oscillator 4, a signal with the same frequency as the frequency information is sent to a distributor 5 and the distributed signals with the same phase are inputted to switches 9a, 9b. The phase detector 6 finds the phase difference between the two input signals, sends it to the 1st storing circuit 7 and changes the switches 9a, 9b and 10. The signal from the oscillator 4 is inputted to a phase detector 6 through the receivers 2a, 2b and the found phase difference is sent to a storing circuit 8. The calibrator 12 calibrates stored information in the storing circuit 7 and the calibrated date are outputted from an output terminal 13. Consequently the phase difference of the input signals can be precisely measured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a receiving device that accurately measures the phase difference of signals entering the input terminals of a plurality of identical receivers over a wide frequency range.

Such a receiving device uses, for example, several fixed antennas, and measures the phase difference of the signals from each of these antennas, and is used to detect the direction of arrival of the incoming radio waves.
The receiving device is required to cover a wide frequency axis, and the transmission phase signals of each receiver are all required to be equal at any given time.

Conventionally, the phase characteristics of each receiver have varied over a wide frequency range, and the fluctuations in the transmission phase due to the influence of ambient temperature are small, that is,
A receiver with high phase stability was used. In such receivers, the more you try to improve the above-mentioned performance, the more the devices used inside the receiver need to have good characteristics over a wide frequency range and be unaffected by ambient temperature. Costs become extremely high. Furthermore, in order to keep the ambient temperature constant, it was necessary to place all the receivers in a constant temperature bath, which resulted in a disadvantage of increasing the size of the device.

Furthermore, there is a conventional receiving apparatus shown in FIG. 1 that does not require the above-mentioned high-performance device. Referring to the figure, (1m) I (lb) is the signal input terminal, (2a)
, (2b) are receivers based on the same specifications. (3) is a frequency controller. (4) is an oscillator, which oscillates a signal of any frequency within the frequency range of the input signal handled by this receiving device according to the frequency of the frequency controller (3).

(5) is a divider, which outputs the signal oscillated by the oscillator (4) into two signals having the same phase.

(6) is a phase difference detector, and the receiver (j machine (2m),
The phase information from (2b) is compared and the phase difference is output. +71 and +81 are memory circuits that store the phase difference, and are a first memory circuit and a second memory circuit, respectively.

(9a) and (9b) are the first switch, and the song is the second switch, which respectively switch the circuits. ul) is a gate circuit. +12 is a calibrator. u3 is the input end (1λ).

(1b) is an output terminal where the phase difference of the signals inputted to each terminal is calibrated and output. I is the first switch (9a).

(9b) and a switching switch that commands the second switching switch 11Lll to switch the circuit.

Next, the operation will be explained.

The switching command device 1 is used for the first switching device (9a), (9b) and the second switching device (9a), (9b).
A command is sent to the switch, and the first switch (9a), (9b) switches to the distributor (5) for a certain fixed period of time.
The output terminal of the receiver M (2a) and the input terminal of the receiver (2b) are respectively connected, and the second switch is connected to the output terminal of the phase difference detector 16) and the input terminal of the second memory circuit (8). Connect the ends. At times other than the times specified above, the first switch (9
m) and (9b) connect the inputs fiii (1) and (lb) to the input terminals of the receivers (21) and (2b), respectively, and the second switch LlG connects the phase difference detector (6) and It is connected to the first memory circuit (7). At the above-determined time, that is, the first switch (9, (9b) connects the output of the distributor (5) and the input terminal of the receiver (2a), (2b), respectively, and the second switch During the time that the oscillator 111 connects the output end of the phase difference detector (6) and the input end of the second storage circuit 18+, the oscillator (4) receives the frequency control signal from the frequency controller (3). The frequency control signal is simultaneously received by M (2
1).

(2b) and is also sent to the second storage circuit (8). Then, the receiver m (211), (2b) is tuned by this frequency control &lI signal so as to receive a signal of the same frequency as the frequency oscillated by the oscillator (4). Therefore, the oscillator (
The signal oscillated by 4) is received by 4i111 (211), (
2b) and sent to the phase difference detector (6). This phase difference detector (6) receives 41t (2a)
, (2b) is detected and output.

Originally, if the characteristics of the receiving 1m (2a) and (2b) are the same, then when receiving the signal from the oscillator (4), the output from the phase difference detector (6) is 0, but if they are the same, Even if the receiver meets the specifications, its activity usually differs slightly, and the output from the phase difference detector (6) will no longer be O.Therefore, the second memory circuit (8) is a frequency controller. 13), the phase difference is stored in correspondence with the frequency of the oscillation signal from the oscillator (4).

When the above-determined time has passed, the first switch (9a
), (9b) are the input end (l, (lb) and the receiver (2a
) and (2b), respectively, and the second switch ill connects the output end of the phase difference detector 16) and the input end of the first storage circuit (7). In this state, the receivers (2m) and (2b) receive external input signals that enter the input terminals (la) and (lb), respectively.

That is, the receivers am (2a) and (2b) control their own frequency selection circuits according to the frequency control signal from the frequency controller 13) to match the frequency of the input signal and do not receive the signal.
゜As a result, the receiver C2m>, (2 is the input terminal (l
The output corresponding to the phase information of the input signal entering a) and (lb) is sent to the phase difference detector 16), the phase difference is detected and sent to the 11th storage circuit (7), and the 9J1 storage circuit (9J1) is sent to the 11th storage circuit (7). 7
) stores the phase difference. Furthermore, a frequency controller (3
) sends the phase difference information received by the receivers (2a) and (2b) to the second storage circuit (8), and the receivers (2a) and (2b) receive the phase difference that was previously stored. The gate circuit Uυ is commanded to send out the phase difference of the signal matching the frequency. By the way, when the first storage circuit (7) completes storage, it instructs the gate circuit 1111 to pass a signal from the input terminal to the output terminal of the circuit aD. As a result, the signal from the jiG1 storage circuit (7) and the signal from the second storage circuit (8) each enter the calibrator α2.

This calibrator (2) calibrates the phase difference signal from the first storage circuit (7) with the phase difference signal from the second storage circuit (8). That is, the phase difference caused by a slight difference in the characteristics of the receivers (2a) and (2b) is corrected.

Since the signals from the oscillator (4) enter the receivers (2λ) and (2b) in the same phase, the difference in phase characteristics of the receivers (2a> and (2b)) is determined by the output of the phase difference detector (6). This is output as a phase difference and stored in the second storage circuit (8).Therefore, the information stored in the second storage circuit (8) is output as a phase difference in the receiver (2).
Since the difference in phase characteristics of a) and (2b) is memorized, the output of the calibrator (1z) is the input terminal (la).

(1b) This means that the phase difference of the input external signal is measured, and this signal is output from the output terminal (131).

Since the conventional receiving device of the second method is configured as described above, the device used in the receiving device does not require very strict performance, but the conventional device of this second method is as follows. It has some drawbacks. In other words, using the calibration signal, store the difference in phase characteristics between the receiving 4Km (2a) and (2b) as a phase difference in the second storage circuit (8), and wait for an external input (if signal). Therefore, when waiting for a signal that does not know when it will be input, the reception m (2a), (2b) will change over time.
There is a possibility that a change in phase characteristics may occur. This is particularly likely to occur immediately after the device is powered on, and it is necessary to wait until the characteristics stabilize. In addition, when dealing with signals that are input infrequently, there is a drawback that if an input signal occurs while the device is being calibrated, the probability of reception will be extremely low.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above.It receives an input signal from the outside, stores that information, and immediately uses the frequency information for calibration. By emitting a signal and calibrating the above stored information, it is possible to accurately connect multiple input terminals without compromising the reception probability even for signals that do not know when they will be input, and without requiring a receiver with strict performance. It is an object of the present invention to provide a receiving device that measures the phase difference of signals input to the receiver.

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

FIG. 2 shows a perception device according to an embodiment of the present invention. In the figure, the same reference numerals as in FIG. 1 indicate the same parts as in FIG. 1. (to) is a frequency storage device that stores frequency information of input signals of the same frequency detected simultaneously by receivers Ia(za) and (zb). (4) is the oscillator (4) in Figure 1
It is an oscillator that receives frequency information stored in a frequency storage group and generates a signal of the same frequency as that frequency.

Next, the operation will be explained.

When the device is in its initial state, that is, when it is waiting for an unknown signal from the outside, the first switch (9a),
(9b) is the input terminal (1st, (lb)) and the receiver (2nd stage).

(2b), and the second switch ul connects the output end of the phase difference detector (6) and the input end of the first storage circuit (7). Therefore, the input terminal (I
When an unknown signal enters ll) and (lb), the signal is received by the corresponding receivers (21) and (2b), respectively, and the frequency information of the input signal is transferred to the frequency storage (to), and the phase information is transferred to the frequency storage device (to). are sent to the phase difference detector (6) respectively.The frequency storage device (to) stores the frequency information (same frequency information) from the receivers (2m) and (2b), and sends it to the oscillator (4). send. The oscillator (4) generates a signal with a frequency according to the above frequency information and sends it to the distributor (5).

The distributor (5) divides the signal from the oscillator (4) into two signals (6) of the same phase and outputs them.

On the other hand, the phase difference detector (6) is connected to the receiver (2m), (2b
), a phase difference is obtained from the phase information from the receiver (22) and the phase information from the reception fi (2b), and this is sent to the first storage circuit (7). The first memory (b) path (7) stores this phase difference, and when the storage is completed, a command is issued to the first switch (9a), (9b) and the second switch to switch the circuit. In other words, the first switch (
ga), (9b) are the output terminals of the distributor (5) and the receiver (
Connect the input terminals of 2a) and (2b) respectively,
The second switch (11 is the output end of the phase difference detector (6)
It is connected to the input end of the memory circuit (8). As a result, the same signal from the oscillator (4) and the same frequency signal that received the external input signal enter the receivers (2a) and (2b), and the receivers (2m) and (2b) Each receives this signal and transmits the phase information to a phase difference detector (6
), the phase difference between the two is determined, and this is sent to the second storage circuit (8
). This phase difference is stored in the second storage circuit (8). When the second memory circuit (8) completes storing this phase difference, the second memory circuit (8) transfers the memory information of the first memory circuit (7) and the second memory circuit (8) to the gate circuit Uυ as a calibrator. (
The first switch (ga), (9b) and the second switch O
Command to return r to its initial state. As a result, the calibrator [1] calibrates the information stored in the first storage circuit (7) with the information stored in the second storage circuit (8) and outputs the result to the output terminal 113. At the same time, the first switch (9m), (9b) and the second switch 11 (I) return to the initial circuit connection state and prepare for the next unknown signal.

In the above circuit configuration, the receiving am (2a).

When (2b) receives a signal from the oscillator (4), the phases of the signals entering the input terminals of reception 1#l (2a) and (2b) are the same, and moreover, the reception FA (2m) and (2b
) is a signal with the same frequency as the received external input signal, the second storage circuit (8) stores the transmission phase characteristics of the reception M (2a) and (2b) at the frequency at which the external signal is received. The difference will be stored as a phase difference. Therefore, the information in the first memory circuit (7) is transferred to the second memory circuit (8).
Calibration using the information from the input terminal (la) corrects the phase difference at the received frequency of the receiver (4m (2a), (2b)) when receiving an external input signal.
.

(1b) The phase difference of the incoming input signal is accurately measured and outputted to the output terminal.

In the above embodiment, the case where the input terminal (21VJ) for inputting an external signal is 21VJ and the number of receivers for receiving the input signal is two has been described, but the number of input terminals and receivers may be two or more. In this case, the phase difference detector (6) is configured to obtain the phase difference between the output phase information of one receiver and the output phase information of other receivers.

As described above, according to the present invention, the input phase difference of a plurality of external human signals is inputted into the input terminal of each receiver as a signal having the same frequency and the same phase as the external signal from the xA generator in the device. Since the device is configured to calibrate using the phase difference signal at the time of the change, and also within a very short time after the external input signal is input, a special No consideration is required, and multiple Uke 1B
Multiple input 4g even if the transmission phase characteristics of the machine are not aligned
It is possible to accurately measure the phase difference of signals, and also has the effect of being able to capture an input signal with very little m& without leaking it and measure its phase difference.

Furthermore, the fact that there is no need to suppress changes in the characteristics of the receiver due to the passage of time or changes in environmental conditions, and that there is no need to align the phase characteristics of multiple receivers, naturally leads to a reduction in the size and cost of the device. There is.

[BRIEF DESCRIPTION OF THE DRAWINGS] 1N is a block diagram of an example of a conventional receiving device;
The figure is a block diagram of a receiver 1g device according to an embodiment of the present invention. (21) (2b) - Receiver, (6) Phase difference detector, Mountain... Frequency memory, +41... Oscillator, (
9a) (9b)...First switch, (1(1...Second switch, (71...First storage circuit, (8)...1
2 memory circuit, Ill...gate circuit, color...calibrator. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A plurality of receivers that output frequency information and phase information of a received input signal, and phase information from one of the plurality of receivers and phase information from another receiver. a phase difference detector that detects the phase difference between the two; a frequency storage device that stores frequency information from the receiver; and a frequency storage device that oscillates a signal with a frequency according to the frequency information stored in the frequency storage device to be in phase. an oscillator that supplies the plurality of receivers to the plurality of receivers, a plurality of first switchers that switch between the signal from the oscillator and the unknown input signal and input the signal to each of the plurality of receivers; a first memory circuit that stores the output of the phase difference detector via a second detector when the receiver is connected to receive an unknown input signal; a second storage circuit for storing information via the first and iJ2 storage circuits; a gate circuit for increasing the storage information in the first and iJ2 storage circuits according to a command from the second storage circuit when the second storage circuit completes storage; A receiving device comprising: a calibrator that calibrates information from the 141 storage circuit that has passed through the gate circuit with information from the second storage circuit that has passed through the gate circuit to obtain a phase difference output signal.