JPH071868Y2 - Space station transceiver - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is directed to telemetry for monitoring and control of artificial satellites and rockets, transmission and reception of command signals, and the distance and distance from ground stations to artificial hygiene and rockets. The present invention relates to a transmitter / receiver for a space station used for transmitting and receiving a signal for measuring a rate of change, and particularly to a circuit configuration of the space station transmitter / receiver designed for miniaturization of the device.

(Prior Art) A conventional transmitter / receiver of this type is generally configured as shown in FIG.

In FIG. 2, the command and tracking signals sent from the ground tracking control station, etc., which is the communication partner of this device, pass through the diplexer 20 and become a high frequency amplifier.
It is amplified by 21, and the first frequency conversion unit 22 performs voltage control oscillation unit 27.
The output of is multiplied by the frequency multiplication unit 29 to be converted to a first intermediate frequency, the first intermediate frequency signal is amplified by the first intermediate frequency amplification unit 23, and further the voltage control is performed by the second frequency conversion unit 24. The output of the oscillating unit 27 is multiplied by the frequency multiplying unit 28 to convert it to a second intermediate frequency, the second intermediate wave signal is amplified by the second intermediate frequency amplifying unit 25, and its output is detected by the phase detecting unit 26. Demodulate with. Of this demodulated signal, the command signal 38 is given to the command demodulation unit 30 for further demodulating to the base band. The signal demodulated by the demodulation unit 30 is
The signal is sent to a signal processing device connected to this device, for example, a command decoder, etc., and artificial hygiene is controlled. The tracking signal 39 demodulated by the phase detector 26 is sent to the transmitter of this apparatus and added to the modulator.

On the other hand, in the transmitter, the reference signal of the transmitter is a crystal oscillator.
31 or the voltage-controlled oscillator 27, and the switching unit 32 switches and uses this reference signal.
After being multiplied by, it is given to the modulator 34. In the modulator 34, the tracking signal 39 from the phase detector 26 of the receiver and the telemetry signal 40 supplied from another signal processing device connected to this device, for example, a telemetry encoder, are given to the modulator 34 and phased. Modulation takes place. The switching unit 32 is for switching the operation mode of the present device between a coherent mode in which the transmission / reception frequency ratio has a specific relationship and a non-coherent mode in which there is no specific relationship, and when relaying a tracking signal, , Mainly using coherent mode.

(Problems to be Solved by the Invention) Since the above-mentioned conventional transmitter / receiver for space stations uses a so-called double superheterodyne receiver configuration in which two different frequencies are used for the intermediate frequency, the circuit scale is Is relatively large, which is a major constraint in achieving compactness and light weight, which are absolute requirements for mounting on artificial hygiene and rockets. Further, in the case of a transmitter, it is difficult for the frequency multiplication unit to be made smaller and lighter, and this tendency becomes stronger as the carrier frequency becomes higher.

The present invention solves such a problem, adopts a single superheterodyne receiver, and uses a phase-locked oscillator instead of the frequency multiplier of the transceiver to simplify the circuit configuration, reduce the size, and reduce the weight. It is an object of the present invention to provide a space station transceiver device that is advantageous in achieving the above.

(Means for Solving the Problems) In order to achieve the above object, the space station transceiver of the present invention uses a single intermediate frequency in the space station transceiver having telemetry, tracking, and command functions. And one local oscillation signal phase-locked oscillator circuit,
A receiver including a voltage controlled oscillator for driving the phase locked oscillator, another phase locked oscillator driven by the output of the voltage controlled oscillator, and a connection to the output of the other phase locked oscillator And a diplexer for sharing a transmitting / receiving antenna.

(Example) Next, the Example of this invention is described with reference to drawings.

FIG. 1 is a circuit configuration system diagram of an embodiment based on the present invention. In FIG. 1, a diplexer 1 is for connecting an antenna for transmitting and receiving radio waves to the other party of communication and this embodiment so as to prevent transmission and reception waves from interfering with each other. In the receiver, a command via the diplexer 1 is used. The high-frequency amplifier 2 amplifies the signal and the tracking signal to a predetermined electric power, and then the frequency converter 3 adds the output of the phase-locked oscillator 7 as a local oscillation frequency and converts it to an intermediate frequency. The command signal and the tracking signal included in the intermediate frequency are amplified by the intermediate frequency amplifying section 4 and then demodulated by the phase detecting section 5. Command signal 15 out of demodulated signal
Is supplied to the command demodulator 8 for further demodulating to the baseband. The local oscillation frequency added by the frequency conversion unit 3 for frequency conversion is supplied from the phase-locked oscillation unit 7 that is synchronized with the phase of the higher harmonic wave of the voltage-controlled oscillation unit 6.

The phase-locked oscillator 7 is composed of a voltage-controlled oscillator (VCO) (not shown) that oscillates at the local oscillation frequency of the frequency converter 3, a loop filter, a phase detector, and the like. The VCO is now synchronized.

Further, the phase detector 5 and the voltage controlled oscillator 6 constitute a so-called phase locked loop.

Therefore, in the receiver of this embodiment, the reception frequency and the reference signal frequency generated in the voltage controlled oscillator 6 can be made to have a coherent relationship, as in the conventional device example shown in FIG.

On the other hand, in the transmitter, the reference signal of the transmitter is either the output of the crystal oscillator 9 or the output of the voltage controlled oscillator 6,
The switching unit 10 selects one of them. This choice is second
The coherent mode and the non-coherent mode are switched by the same operation as the conventional example shown in the figure.

The output of the switching unit 10 selected in this way is given to the phase-locked oscillator 11, and the phase-locked oscillator 11 outputs the harmonic frequency of the output of the switch 10 as in the case of the phase-locked oscillator 7 of the receiver. A synchronized oscillation frequency is generated and is sent to the modulator 12 as a carrier.

In the modulator 12, the carrier wave is phase-modulated by the tracking signal 16 demodulated by the phase detector 5 of the receiver and the telementary signal 17 from a telemetry encoder (not shown) connected to the outside. The output of the modulator 12 is the power amplifier 13
Then, the power is amplified to the required power, and is transmitted as a radio wave to the communication partner who is fed to the antenna via the diplexer 1. The power supply stabilizing unit 14 creates a secondary power supply necessary for this device from the primary power supply and supplies it to each unit of the transceiver.

(Effects of the Invention) As described above, the present invention employs the single superheterodyne system for the receiver, and the phase for synchronizing the local oscillation power for frequency conversion with the harmonics of the output of the voltage control oscillator for the reference signal. By adopting a phase-locked oscillator that directly oscillates at the carrier frequency in the transmitter and a modulator that directly modulates the carrier, the receiver uses the double superheterodyne method as in the past. However, since it is possible to avoid a configuration that is disadvantageous for downsizing and weight reduction, which uses a frequency multiplier in the key points of the transceiver, both the transceiver and the configuration are simple, and therefore the overall size and weight of the device is reduced. It has the effect of being extremely advantageous to.

[Brief description of drawings]

FIG. 1 is a circuit configuration system diagram of an embodiment according to the present invention. FIG. 2 is a circuit configuration diagram of a conventional space station transceiver device example. 1,20 …… Diplexer 2,21 …… High frequency amplification section 3 …… Frequency conversion section 4, …… Intermediate frequency amplification section 5,26 …… Phase detection section 6,27 …… Voltage control oscillation section 7,11 …… Phase-locked oscillator 8,30 ...... Command demodulator 9,31 …… Crystal oscillator, 10,32 …… Switching unit 12,34 …… Modulator, 13,36 …… Power amplifier 14,37 …… Stable power supply Signaling unit 15,38 …… Command signal 16,39 …… Tracking signal 17,40 …… Telemetry credit 22 …… First frequency conversion unit 23 …… First intermediate frequency amplification unit 24 …… Second frequency conversion unit 25 ...... Second intermediate frequency amplifier 28,29,33,35 …… Frequency multiplier

Claims (1)

[Scope of utility model registration request] 1. A space station transceiver having telemetry, tracking, and command functions, wherein a single intermediate frequency is used to drive one local oscillation signal phase-locked oscillation circuit and the phase-locked oscillation circuit. A transmitter including a receiver including a voltage-controlled oscillator, another phase-locked oscillator circuit driven by the output of the voltage-controlled oscillator, and a modulator circuit connected to the output of the other phase-locked oscillator circuit. And a diplexer for sharing a transmitting / receiving antenna.