JPS6338333A - Microwave band switch matrix - Google Patents

Abstract

PURPOSE:To surely detect a fault and to easily discriminate the factors of the fault by comparing each input/output level detecting signal with a switch control signal and deciding the fault state of each microwave switch element. CONSTITUTION:The input signal level detecting circuits 4-1-4-n detect the microwave input level of each input port to a switch matrix and output the input level detecting signals respectively. While the output signal level detecting circuits 5-11-5-nn detect the output levels of microwave band switch elements 3-11-3-nn and output the output level detecting signals respectively. Then the comparison is carried out by the fault deciding circuits 6-11-6-nn among input level detecting signals, output level detecting signals and switch control signals to decide the fault states of those elements 3-11-3-nn. Thus it is possible to monitor the microwave signals themselves to be switched and to decide a faulty state or a normal state.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applied to a microwave band switchma I mounted on a multi-beam communication satellite etc. and equipped with a fault detection circuit for the switch section.
・About Ricks.

[Conventional technology-1 S-T DMA in multi-beam communication satellite
In order to realize this method, [1 manual force n for the number n of beams is required]
A microwave switch matrix of outputs is used. This switch matrix requires the ability to connect n inputs to n outputs in any combination. Therefore, a crossbar type matrix and a multiple frame configuration have been proposed as the Sui-Sochi matrix.

As the number of input/output terminals n of this switch matrix increases, the number of unit switches used internally increases dramatically.
The degree of failure occurrence also increases. Communication satellites are required to adopt a configuration that switches to a standby system in the event of a failure and does not disrupt operations.

[Problem that the invention seeks to solve]

Conventionally, as a circuit for detecting the occurrence of such a fault, a circuit has been proposed that monitors the DC bias operation of a unit switch used in a switch matrix.

For example, in a unit switch using a PIN diode, P
The DC current that flows through the IN diode when it is on and off is monitored to determine whether it is normal or not. Furthermore, in an amplifier-type switch using an FI element, the direct current flowing through the I''ET element is similarly monitored during on and off times.

However, with conventional DC current monitoring, even if the DC current appears correct, the microwave band signal may be abnormal, or there may be input or output circuits that cannot be monitored in terms of DC. There were problems such as the inability to detect failures.

It is an object of the present invention to provide a microwave band switch matrix which solves the above problems and allows the microwave signal itself to be switched to be monitored to determine whether it is faulty or normal.

[Means for solving problems]

The configuration of the present invention provides a microwave band switch matrix configured by arranging and connecting microwave band switch elements in a 71-helix shape for turning on/off a microwave band signal according to a switch control signal. an input signal level detection circuit that detects the microwave manual power level of each person's capo 1 to each and outputs a manual power level detection signal, and an output level detection circuit that respectively detects the output level of the microwave band switch element. A fault state of each of the microwave switch elements is determined by comparing an output signal level detection circuit that outputs each signal with each of the input level detection signals, each of the output level detection signals, and each of the switch control signals. It is characterized by being comprised of a fault determination circuit.

1 Embodiment) FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, IN+ (i =] to n) is the microwave band input signal, OUT+ (i = 1 to n) is the microphone four-wave band output signal, ]-ij (i, j = 1 to n) is the input signal IN
3jj (i , j=l ~ n) are microwave switching elements for connecting/disconnecting the input signal T N I and the output signal OUT, and CIJ (j,, j-] ~ n
) is a switch control signal for controlling the switch state of switch elements 3-j and j, and 4-j (i=1 to n) is an input level detection signal 1) that indicates the microwave band input signal level.
An input signal level detection circuit 5-i, j (i, j=l to n) for detecting as E T + is an output level detection signal D Output A3 level detection circuit 6-4j (i, j = 1 to n) for detecting as J This is a fault determination circuit that determines the fault status of each switch element by comparing.

Table 1 As shown in Table 1, this fault determination circuit has CIJ, D
By comparing the states of ET+ and DET+t, it is determined whether each switch element is operating normally or is in a faulty state.

In addition, r1'' of C1J in Table 1 indicates ON of the switch element, 0 indicates OFF, and rl of DE1゛,
, indicates the signal "presence" of IN, "0" indicates the signal [absence], and [1] of DETz indicates the output signal "presence" of the switch element, and "0" indicates "absence". .

FIG. 2 shows each operating waveform diagram of FIG. 1. A control signal CIJ that controls the open/close state of each switch element, an input level detection signal DF, T that corresponds to the presence or absence of a microwave band input signal, and an output level detection signal that corresponds to the presence or absence of a microwave band output signal of each switch element. The output signals of the DETIJ and failure determination circuit are shown.

The output level detection signal DE T I J has three operation examples: when each switch element is operating normally, when a normally closed fault occurs, and when a normally open fault occurs. Corresponding waveforms are shown, and the waveforms of the output signals of the fault determination circuit corresponding to the three normal/failure modes of each switch element are shown, similarly to the D E T I J waveform.

If the switch element is normal, the output signal of the failure judgment circuit will be normal at any time according to the judgment criteria in Table 1, so the waveform will not indicate normality and will output 10''.
If the switch element has a normally closed fault, the first
According to the criteria in the table, CIJ is "1" and D E T
Only when + is 11J is a "failure" and other periods are "normal", so the waveform is also "11" only during the "failure" period and "0" otherwise.
” is output. In addition, if the switch element is always open and has a fault, according to the criteria in Table 1, it will be a "failure" only when CIJ is "0" and DI 1 is [1]. Therefore, the waveform is also [failure J period only]
1'' and the others are r Q J.

It can thus be seen that in all cases, the operating state of each switch element is correctly determined and failures are reliably detected.

It should be noted that failure modes other than these, such as failures that repeatedly open and close, oscillations of switch elements whose output signals are present even during unmanned signals, can be easily detected as is clear from the predetermined criteria in Table 1.

Furthermore, by adding a simple logic circuit to the circuit of this embodiment, it is possible to not only determine whether it is normal or faulty, but also to determine the type of fault mode, such as normally closed or normally open 2 oscillations. is clear.

[Efficacy of invention]

As described above, according to the present invention, 1) any fault can be reliably detected regardless of the fault mote of the switch element, and 2) when a fault occurs in each switch element, the fault can be detected. The type of mode can be determined.

For this reason, the microwave band switchma
~Rix can be composed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a waveform diagram showing the operation of each part in FIG. 1. 1-11~1-nn...Input coupler, 2-11~2
-nn...Output coupler, 3-11 to 3-nn...Microwave switch element, 4-1 to 4-n...Input signal level detection circuit, 5-1.1 to 5-nn...Output Signal level detection circuit, 6-11 to 6-nn...Failure determination circuit. Agent Patent Attorney Toru Uchihara □, Kazu ″

Claims (1)

[Claims] The microwave band signal is turned on and off according to the switch control signal.
In a microwave band switch matrix configured by arranging and connecting microwave band switch elements that turn off in a matrix, the microwave input level of each input port to the switch matrix is detected and an input level detection signal is generated. an input signal level detection circuit that outputs each output level, an output signal level detection circuit that detects each output level of the microwave band switch element and outputs each output level detection signal, and each of the input level detection signals and each output level. A microwave band switch matrix comprising: a fault determination circuit that determines a fault state of each of the microwave switch elements by comparing a detection signal with each of the switch control signals.