JPS61201174A - Redundant structure of followup receivers - Google Patents

Abstract

PURPOSE:To improve reliability by connecting current-use and standby followup receivers to two output terminals of a hybrid circuit. CONSTITUTION:A signal synthesis circuit 3a for synthesizing two error signals 1b and 1c and a signal synthesis circuit 3b for synthesizing output signals of the circuit 3a and a reference signal 1a are provided in a hybrid circuit constitution. The two outputs of the hybrid circuit are inputted into the current-use followup receiver 14 and to the standby followup receiver 15. Thus, there is no necessity of providing a switch circuit for switching between the current-use and standby to improve the reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a redundant configuration of a monopulse tracking receiver used to track an antenna direction in the direction in which received radio waves arrive.

SUMMARY OF THE INVENTION The present invention provides a monophonic signal that combines a reference received signal and two error signals related to orthogonal z-axes to form two channels or one channel, in order to track the direction of the antenna in the direction in which received radio waves arrive. In the tracking receiver of the Luss method, a signal synthesis circuit for synthesizing the two error signals or a signal synthesis circuit for synthesizing the synthesis error signal outputted from the signal synthesis circuit and the reference received signal is an /X hybrid. The hybrid circuit has a redundant configuration in which the current and standby tracking receivers are respectively connected to two output terminals of the hybrid circuit.

Eliminates the need for a changeover switch to switch from active to standby,
It is possible to prevent switching failures due to faulty switch contacts, etc., and improve reliability.

Prior Art FIG. 3 is a block diagram showing an example of a redundant configuration of a conventional tracking receiver. That is, the reference received signal input terminal 1a
, the reference received signal and the two error signals inputted from the error signal input terminals 1b and lc are respectively switched to the changeover switch 51.
~ S3 is used to input the information to the current or standby tracking receiver. Two error signals inputted from the error signal input terminals 1b and lc are combined by a signal synthesizer 3a after one of them is phase-shifted by 90° through a 90° phase shifter 2. The combined error signal output from the signal combiner 3a is subjected to amplitude modulation or phase modulation using a low frequency signal by a modulator 4, and is inputted to the signal combining circuit 3b.

The signal synthesis circuit 3b synthesizes the modulated synthesis error signal and the reference received signal inputted from the reference signal input terminal 1a to form one channel. The output of the signal synthesis circuit 3b is frequency-converted by a frequency converter 6 into a signal in an intermediate frequency band, and is amplified by an amplifier 8. Note that the low frequency oscillator 5 is an oscillator for the above-mentioned low frequency modulation, and the local oscillator 7 is an oscillator for frequency conversion.

The gain of the amplifier 8 is controlled by an automatic gain control circuit 9, and its output amplitude is constant. The signal separation circuit 10 separates the output signal of the amplifier 8 into a reference signal and an error signal, and outputs the signal to the product detector 11a. Furthermore, the zero-product detector 11a shifts the phase of the error signal by 90 degrees and inputs it to the product-product detector 11b. Zero product detectors 12a, 12 which perform product detection on the error signal phase shifted by 90 degrees using the reference signal and send it to the product detector 12b.
b performs multiplicative detection on each input using the low frequency signal output from the low frequency oscillator 5, and outputs a two-dimensional error voltage to the detection error output terminals 13a and +3b. In the above conventional circuit, switching between active and standby is done by switch S! ~S
This is done by switching 3.

Problems to be Solved by the Invention The above-described redundant configuration of the conventional tracking receiver includes a selector switch 51 to switch three input signals from active to standby.
The drawback is that S3 has poor reliability because it has moving parts. If the changeover switch also has a redundant configuration, the configuration will be complicated, and furthermore, the signal passing loss will increase. Further, if switching is performed by an electrical active element without using a mechanical switch, the passage loss of each signal increases.

The present invention aims to solve the above-mentioned conventional drawbacks and improve reliability by making it possible to switch between active and standby using a simple circuit without using a switch.

Configuration of the Invention The redundant configuration of the tracking receiver of the present invention is a monopulse type tracking receiver that inputs a reference received signal and two error signals related to two orthogonal axes to track the antenna pointing direction in the direction in which received radio waves arrive.

A signal synthesis circuit for synthesizing the two error signals or a signal synthesis circuit for synthesizing the synthesis error signal outputted from the signal synthesis circuit and the reference received signal is constituted by a hybrid circuit, A feature is that a working and standby tracking receiver is connected to two output terminals, respectively.

Embodiments of the Invention Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

That is, the reference signal input terminal 1a, the error signal input terminal 1
A reference reception signal and two error signals are input from b and lc, respectively. The error signal inputted from the error signal input terminal 1c is shifted in phase by 90 degrees through the 80° phase shifter 2 and inputted to the signal synthesizer 3a, and the signal synthesizer 3a is inputted from the error signal input terminal 1b. Combines and outputs the error signal. The combined error signal output from the signal combiner 3a is subjected to amplitude modulation or phase modulation at a low frequency by the modulator 4, and is input to the signal combining circuit 3b. The signal for the above modulation is supplied from the low frequency oscillator 5 of the active tracking receiver 14 (the output of the low frequency oscillator 5 of the backup tracking receiver 15 is also connected to the modulator 4, but for now Since power is not supplied to the standby tracking receiver 15, no signal is output from its low frequency oscillator 5), and the signal synthesis circuit 3b inputs the modulated synthetic error signal and the reference signal input terminal 1a. The received reference signal is combined into one channel. The signal synthesizer 3b is composed of a hybrid circuit, and one of its two outputs is input to the frequency converter 6 of the active tracking receiver 14, and the other is input to the frequency converter 6 of the active tracking receiver 1.
5 to the frequency converter 6. The signal is now frequency-converted to an intermediate frequency band signal by the frequency converter 6 of the active tracking receiver 14, and amplified by the amplifier 8. Note that the local oscillator 7 is an oscillator for frequency conversion.

The gain of the amplifier 8 is controlled by an automatic gain control circuit 9, and its output level is kept constant. The signal separation circuit 10 separates the output of the amplifier 8 into a reference signal and an error signal, and outputs the signal to the product detector 11a. Furthermore, the zero-product detector 11a shifts the phase of the error signal by 80° and inputs it to the product-product detector 11b. Zero product detectors 12a and 12b perform product detection on the error signal phase-shifted by 90° using the reference signal and send it to the product detector 12b.
performs multiplicative detection on each input signal using the low frequency signal output from the low frequency oscillator 5, and outputs two-dimensional error voltages to detection error output terminals 13a and 13b.

The 48 backup system tracking receivers 15 are equipped with a low frequency oscillator 5 similar to the above.
1 frequency converter 62 local oscillator 7. Amplifier 8, automatic gain control circuit 9. Signal separation circuit 10. Product detector 11a,
llb, +2a, and 12b constitute a redundant circuit.

In this embodiment, switching from the active tracking receiver 14 to the backup tracking receiver fi15 can be performed by stopping the power supply to the active tracking receiver a14 and supplying power to the backup tracking receiver 11115. . Since no changeover switch is used in the signal circuit, reliability is improved and loss does not increase. Note that the 90° phase shifter 2.
Although no redundant circuits are provided for the signal combiners 3a, 3b and the modulator rS4, the probability that these parts will fail is extremely small, and there is no reliability problem.

FIG. 2 is a block diagram showing another embodiment of the present invention, in which the signal combiner 3b and modulator 4 are also made redundant. In this case, the signal combiner 3a is configured with a hybrid circuit, and two output terminals of the signal combiner 3a are connected to the modulator 4a of the active tracking receiver 14 and the modulator 4b of the backup tracking receiver 15. Further, the reference reception signal inputted from the reference signal input terminal 1a is branched into two by the signal branching circuit 16. One output of the signal branch circuit 1B is inputted to the signal combiner 3b of the working system tracking receiver 14,
The other output is input to the signal synthesizer 3c of the backup tracking receiver 15. The operations of the tracking receivers 14, 15, etc. are the same as those described above, so a description thereof will be omitted. In this case, by making all active elements redundant, a higher degree of reliability is guaranteed.

Tracking reception methods with an 1-channel configuration include methods that modulate each of the two error signals and then combine them.Also, in a tracking receiver with a 2-channel configuration, the two error signals are combined, but the error signal and the reference signal are combined. No signal synthesis is performed.
In either case, the hybrid power is input to the current and standby signal synthesis circuits used when combining three channels (one reference signal and two error signals) to create two channels or one channel. Of course, if this is done, the subsequent circuits can be made redundant. For channels that do not use a signal combining circuit, a new signal branching circuit using a hybrid circuit may be inserted, and the two outputs of the signal branching circuit may be input into the current and backup channels.

Effects of the Invention As described above, in the present invention, a signal synthesis circuit for synthesizing two error signals or a signal synthesis circuit for further synthesizing the output of the signal synthesis circuit with a reference signal is configured by a hybrid circuit. , 2 of the hybrid circuit
Since the configuration is configured such that two outputs are inputted to the working and standby, there is no need for a switch circuit for switching between the working and standby, improving reliability and not increasing loss. In the case of high frequencies, such as those using waveguides, the construction is particularly simple, with fewer components and active elements, and improved reliability.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a block diagram showing another embodiment of the present invention, and FIG. 3 is a block diagram showing an example of a redundant configuration of a conventional tracking receiver. In the figure, la: reference signal input terminal, lb, lc: error signal input terminal, 2: 90' phase shifter, 3a, 3b, 3c
: signal synthesizer, 4.4a, 4b : modulator, 5: low frequency oscillator, 6: frequency converter, 7: local oscillator, 8: amplifier, 9: automatic gain control circuit.

Claims (1)

[Claims] In a monopulse tracking receiver that inputs a reference received signal and two error signals related to two orthogonal axes to track the direction of antenna orientation toward the arrival direction of received radio waves, the two error signals are combined. A signal synthesis circuit for synthesizing a signal synthesis circuit or a signal synthesis circuit for synthesizing the synthesis error signal outputted from the signal synthesis circuit and the reference reception signal is configured by a hybrid circuit, and a signal synthesis circuit for synthesizing the synthesis error signal outputted from the signal synthesis circuit and the reference reception signal is configured by a hybrid circuit, and a signal synthesis circuit for synthesizing the synthesis error signal outputted from the signal synthesis circuit and the reference reception signal is configured by a hybrid circuit, and A redundant tracking receiver configuration characterized by connecting a working and backup tracking receiver.