Satellite-borne low-code-rate BPSK demodulation Costas loop circuit

A low bit rate, loop circuit technology, applied in the phase modulation carrier system and other directions, can solve the problem that the circuit cannot provide a demodulation lock signal, etc., and achieve the effect of low cost, easy implementation, and obvious demodulation lock indication.

Inactive Publication Date: 2019-08-16
SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] Many methods can be used to demodulate BPSK signals, among which the more classic one is the Costas ring, whose internal voltage-controlled crystal oscillator output freque...

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  • Satellite-borne low-code-rate BPSK demodulation Costas loop circuit
  • Satellite-borne low-code-rate BPSK demodulation Costas loop circuit
  • Satellite-borne low-code-rate BPSK demodulation Costas loop circuit

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Embodiment Construction

[0023] A space-borne low bit rate BPSK demodulation Costas loop circuit proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Advantages and features of the present invention will be apparent from the following description and claims.

[0024] see figure 1 , the present embodiment provides an onboard low bit rate BPSK demodulation Costas loop circuit, including: a first multiplier, a second multiplier, a third multiplier, a first low-pass filter, and a second low-pass filter device, loop filter, voltage controlled crystal oscillator, frequency divider;

[0025] The voltage-controlled crystal oscillator is used to generate the reference signal, and the frequency divider is used to divide the reference signal to obtain the first BPSK carrier signal and the second BPSK carrier signal respectively. The phase difference between the first BPSK carrier signal and the second BPSK carrier sig...

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Abstract

The invention discloses a satellite-borne low-code-rate BPSK demodulation Costas loop circuit which comprises a multiplier, an active low-pass filter, a voltage-controlled crystal oscillator, a frequency divider, a detector, a comparator and a loop filter and is used for completing demodulation of an extremely-low-code-rate BPSK signal. The circuit is based on a classical Costas ring, wherein thecore circuits are all simulation devices, the phase discriminator is realized by a multiplier, the active low-pass filter is composed of an operational amplifier, the bandwidth of the active low-passfilter is extremely narrow, the voltage-controlled crystal oscillator outputs reference signals to be subjected to frequency division by a frequency divider to obtain BPSK carrier signals, and I-pathsignals and Q-path signals are subjected to phase discrimination by the multiplier and then can obtain locking indication signals through a comparator. Aiming at BPSK signal demodulation with an extremely low code rate, the circuit can provide an excellent demodulation performance and a reliable locking indication signal, meets the use requirements of satellites, and has the advantages of simplicity, reliability, easiness in implementation, low cost, good radiation resistance and the like.

Description

technical field [0001] The invention belongs to the technical field of satellite-borne BPSK signal demodulation, and in particular relates to a low-bit-rate BPSK demodulation Costas ring circuit on board. Background technique [0002] Considering factors such as modulation efficiency, bit error rate, and maturity, the BPSK (Binary Phase Shift Keying) modulation method is generally used for data communication on the China-Satellite-Earth link. With the development of space technology, especially the continuous development of deep space exploration, due to the very long communication distance, the signal received by the spaceborne receiver is very weak, and the signal-to-noise ratio is very low. The code rate of the BPSK signal in the detection will be very low. The current minimum code rate in the world is 7.8125bps, and the frequency of the BPSK signal is generally 8kHz. [0003] Many methods can be used to demodulate BPSK signals, among which the more classic one is the Co...

Claims

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Application Information

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IPC IPC(8): H04L27/22
CPCH04L27/22
Inventor 王文伟武加纯孙垒梁晖李雷
Owner SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM
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