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Parallel AltBOC navigation signal intermediate frequency generation method

A navigation signal and intermediate frequency technology, which is applied in the field of satellite navigation, can solve the problems of high clock frequency and speed resource requirements, deterioration of channel characteristic signal quality, and difficulty in implementation, and achieves accurate filtering processing, reduced design costs, and versatility enhanced effect

Active Publication Date: 2015-12-02
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0007] (1) Although method 1 has a small baseband signal bandwidth (half the RF signal bandwidth), I and Q go through different paths to the quadrature modulator after digital baseband generation, and the difference in channel characteristics of different paths leads to the final signal quality deterioration
[0008] (2) Method 2 is a more commonly used navigation signal generation method, but the general method has important constraints: the large bandwidth of AltBOC makes the intermediate frequency frequency higher, and the sampling frequency needs to be very high
This has high requirements on the clock frequency and speed resources of the generated device, and it is difficult to implement in existing high-reliability devices

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  • Parallel AltBOC navigation signal intermediate frequency generation method
  • Parallel AltBOC navigation signal intermediate frequency generation method
  • Parallel AltBOC navigation signal intermediate frequency generation method

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Embodiment Construction

[0052] Below in conjunction with accompanying drawing, working principle and working process of the present invention are further explained and illustrated:

[0053] Such as figure 1 Shown, a kind of parallel AltBOC navigation signal intermediate frequency generation method of the present invention, comprises steps as follows:

[0054] (1) Generate a baseband signal;

[0055] In the 122.76MHz clock domain, generate 4 channels of two-level navigation signals Ad, Ap, Bd, and Bp. The four channels of navigation signals contain the data, subcode and pseudocode required for ranging, and are generated by AltBOC constant envelope processing to generate I and Q two-way baseband quadrature signals;

[0056] (2) complex filtering;

[0057] Compensate the amplitude-frequency distortion of I and Q by using complex filtering to generate two baseband quadrature signals of cI and cQ (cI+jcQ is obtained by performing complex filtering on I+jQ);

[0058] The specific implementation of comp...

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Abstract

The invention discloses a parallel AltBOC navigation signal intermediate frequency generation method, comprising the steps of: generating I and Q paths of baseband orthogonal signals; utilizing complex filtering to perform amplitude-frequency distortion compensation on I and Q to generate cI and cQ paths of baseband orthogonal signals; performing low pass filtering on generated cI and cQ paths of baseband orthogonal signals; generating intermediate frequency carrier waves; parallelly modulating the intermediate frequency carrier waves and the cI and cQ paths of baseband orthogonal signals; and finally performing parallel-serial conversion to output intermediate frequency signals. The method can generate AltBOC signals with lower frequency, guarantee the channel feature consistency of the I and Q branches, and meanwhile guarantee signal quality.

Description

technical field [0001] The invention relates to a parallel AltBOC navigation signal intermediate frequency generation method, which belongs to the technical field of satellite navigation. Background technique [0002] Among the navigation satellite signals, the AltBOC signal is selected by the European Galileo satellite navigation system as the composite and modulation method of the E5 signal, and China's BDS also plans to adopt it. AltBOC signal bandwidth is wide, its subcarrier, pseudo code and constant envelope generation look-up table method is special, and the system has strict requirements on clock frequency. [0003] Currently, AltBOC navigation signals can be generated by the following methods: [0004] Method 1, using the I, Q quadrature up-conversion method; [0005] Method 2, using intermediate frequency generation, and then frequency conversion modulation; [0006] However, the above method has the following problems: [0007] (1) Although method 1 has a smal...

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Application Information

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IPC IPC(8): G01S19/37
CPCG01S19/37
Inventor 王瑛苏哲王磊蒙艳松李毅松周昀
Owner XIAN INSTITUE OF SPACE RADIO TECH
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