A Telemetry Transmitter and Its Phase Modulation Method That Can Effectively Reduce Modulation Errors

A technology of modulation degree and transmitter, which is applied in the field of aerospace measurement and control communication, can solve the problems that the error of telemetry phase modulation modulation degree exceeds the allowable range of the system, and the adverse effects of demodulation of the ground receiving system, etc., and achieves strong anti-space radiation ability, simple and reliable structure , The effect of reducing the modulation error

Active Publication Date: 2017-07-04
SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the output amplitude of the telemetry acquisition and editing unit, the length of the cable, and the attenuation vary widely, it is difficult to ensure that the amplitude variation range of the telemetry DPSK signal entering the telemetry transmitter is consistent, which often leads to the error of the telemetry phase modulation modulation degree exceeding The allowable range of the system will adversely affect the demodulation of the ground receiving system

Method used

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  • A Telemetry Transmitter and Its Phase Modulation Method That Can Effectively Reduce Modulation Errors
  • A Telemetry Transmitter and Its Phase Modulation Method That Can Effectively Reduce Modulation Errors
  • A Telemetry Transmitter and Its Phase Modulation Method That Can Effectively Reduce Modulation Errors

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Embodiment 1

[0040] to combine Figure 1-Figure 2 , this embodiment describes in detail the telemetry transmitter of the present invention that can effectively reduce the modulation error, such as figure 1 Shown is its structural principle diagram, which includes: amplitude stabilization circuit 1, phase modulation circuit 2 and radio frequency amplifier circuit 3, wherein: the output end of amplitude stabilization circuit 1 is connected to the input end of phase modulation circuit 2, and the phase modulation circuit 2 The output end is connected with the input end of the radio frequency amplifier circuit 3 . Amplitude stabilization circuit 1 is used to process the input telemetry DPSK signal with large amplitude change into telemetry DPSK signal with small amplitude change, and then input it to phase modulation circuit 2; phase modulation circuit 2 is used to convert the signal with small amplitude change The telemetry DPSK signal is phase-modulated on the radio frequency carrier; the ra...

Embodiment 2

[0048] combine image 3 , this embodiment describes in detail the phase modulation method of the present invention that can effectively reduce the modulation degree error, which includes the following steps:

[0049] S61: Process the telemetry DPSK signal with a large amplitude change into a telemetry DPSK signal with a small amplitude change;

[0050] S62: phase-modulate the telemetry DPSK signal with a small amplitude change on the radio frequency carrier;

[0051] S63: Amplify the power of the radio frequency signal modulated with the telemetry DPSK signal to an appropriate value.

[0052] Wherein: Step S61 further includes:

[0053] S611: Input the telemetry DPSK signal with a large amplitude change to the numerator terminal of the divider, and then output it to the phase modulation circuit. Before entering the phase modulation circuit, split one channel to the detector;

[0054] S612: The wave detector detects the signal amplitude of the DPSK signal with a large change...

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Abstract

The invention discloses a telemetering transmitter capable of effectively reducing modulation errors and a phase modulation method thereof. The telemetering transmitter comprises an amplitude stabilization circuit, a phase modulation circuit and a radio frequency amplification circuit, wherein the output end of the amplitude stabilization circuit is connected with the input end of the phase modulation circuit; and the output end of the phase modulation circuit is connected with the input end of the radio frequency amplification circuit. The phase modulation method comprises steps: a telemetering DPSK signal with large amplitude variation is processed into a telemetering DPSK signal with small amplitude variation; the telemetering DPSK signal with small amplitude variation is subjected to phase modulation on a radio frequency carrier; and power of the radio frequency signal for the modulated telemetering DPSK signal is amplified to a proper value. According to the telemetering transmitter capable of effectively reducing modulation errors and the phase modulation method thereof disclosed by the invention, the modulation errors are kept in a small range, and a ground receiving system can be ensured to normally demodulate the telemetering DPSK signal.

Description

technical field [0001] The invention relates to the technical field of aerospace measurement and control communication, in particular to a telemetry transmitter capable of effectively reducing modulation degree errors and a phase modulation method thereof. Background technique [0002] In the satellite-borne unified carrier measurement and control system, the transmission of telemetry data on the satellite usually adopts the residual carrier modulation scheme (PCM-PSK-PM), that is, after the telemetry data is encoded by PCM and modulated by DPSK, the RF downlink carrier is simulated and phase-modulated, and finally After power amplification, it is sent to the ground station for reception. The degree of phase modulation modulation is an important indicator of the telemetry transmitter. If the phase modulation modulation is too large or too small, it will affect the signal-to-noise ratio and bit error rate of the ground receiving demodulation, and then affect the measurement a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/04H04L27/20
Inventor 金骏徐贺明印飚
Owner SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM
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