Adaptive coding modulation method for data transmission of inter-satellite links of satellite navigation system

Active Publication Date: 2017-12-22
HARBIN ENG UNIV
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Although QPSK modulation is a constant envelope modulation, its phase is discontinuous, which will cause spectrum expansion and high-voltage transient phenomena of the transmi

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  • Adaptive coding modulation method for data transmission of inter-satellite links of satellite navigation system
  • Adaptive coding modulation method for data transmission of inter-satellite links of satellite navigation system
  • Adaptive coding modulation method for data transmission of inter-satellite links of satellite navigation system

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[0031] The following examples describe the present invention in more detail.

[0032] Combine figure 1 , The method involved in the present invention consists of inter-satellite distance estimator 1, coded modulation scheme selector 2, LDPC encoder 3, random interleaver 4, CPM modulator 5, additive white Gaussian noise channel 6, coded modulation scheme estimator 7. CPM demodulator 8, deinterleaver 9, and LDPC decoder 10 are constituted. The transmitter consists of an inter-satellite distance estimator 1, a coded modulation scheme selector 2, an LDPC encoder 3, a random interleaver 4 and a CPM modulator 5; the receiver consists of a coded modulation scheme estimator 7, a CPM demodulator 8, and a solution An interleaver 9, an LDPC decoder 10, and a random interleaver 4 are constituted.

[0033] In the transmitter, using the feature of storing all satellite ephemeris by any satellite in the navigation constellation, first calculate the distance between any two satellites in the con...

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Abstract

The invention provides an adaptive coding modulation method for data transmission of inter-satellite links of a satellite navigation system. The distance between any two satellites in a constellation is measured by an inter-satellite distance measuring device, the signal-to-noise ratio of a received signal of a receiving terminal is estimated, a coding modulation scheme selector selects a corresponding LDPC-CPM scheme on the basis of a target error rate algorithm and a handling capacity-to-bandwidth ratio algorithm and sends the LDPC-CPM scheme to a receiver through pilots, a data signal is processed by an LDPC code coder, a random interweaver and a CPM modulator to generate a modulated signal, the modulated signal is sent to an additive white Gaussian noise channel, a pilot signal is analyzed by a coding modulation scheme estimator and then superposed with the data signal of noise of the additive white Gaussian noise channel to be subjected to iterative detection by a CPM demodulator, a de-interweaver, an LDPC decoder and a random interweaver, and the LDPC decoder makes a hard decision and then outputs data. According to the adaptive coding modulation method, the reliability and effectiveness of an inter-satellite adaptive coding modulation system can be effectively improved.

Description

technical field [0001] The present invention relates to a satellite navigation system inter-satellite link (Inter-satellite Link, ISL) data transmission (referred to as "digital transmission") method, especially a continuous phase modulation (Continuous Phase Modulation, CPM) based automatic Adaptive coding modulation (Adaptive Coding Modulation, ACM) data transmission method. Background technique [0002] With the intensification of competition between Global Navigation Satellite System (GNSS) and the escalation of navigation warfare, higher requirements are placed on positioning accuracy, integrity, reliability and anti-destruction capabilities. Inter-satellite links ( ISL) is one of the main ways to solve this problem. The mutual ranging and communication between satellites through the inter-satellite link can shorten the update cycle of the ephemeris, realize the satellite-ground joint orbit determination of the navigation constellation, thereby improving the positionin...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04B7/185
CPCH04B7/18521H04L1/0003H04L1/0009H04L1/0057H04L1/0061H04L1/0071H04B7/18543
Inventor 薛睿于欢王盾陈涛
Owner HARBIN ENG UNIV
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