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Zero-intermediate-frequency spread-spectrum receiver processing module

A processing module and receiver technology, which is applied in the field of zero-IF spread spectrum receiver processing module, can solve the problems of poor anti-interference and low security performance, and achieve the effect of overcoming multipath interference

Inactive Publication Date: 2017-07-04
HARBIN MIMI RICE IND TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention adopts the spread spectrum communication system, overcomes the shortcomings of traditional radio navigation systems such as multipath interference, low security performance, and poor anti-interference performance, and can realize high-precision, high-reliability, and autonomous navigation and positioning of key areas and key directions Zero-IF spread spectrum receiver processing module

Method used

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  • Zero-intermediate-frequency spread-spectrum receiver processing module
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  • Zero-intermediate-frequency spread-spectrum receiver processing module

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Such as figure 1 , figure 2 , image 3 As shown, a zero-IF spread spectrum receiver processing module, the processing module is composed of a mixer, a pseudo-code correlator, an integral cleaner, a digital loop filter, a code phase counter, a carrier cycle phase counter, a code delay Control circuit, code DCO, phase control logic, carrier DCO and read-write control logic; the mixer is connected to a pseudo-code correlator, and the pseudo-code correlator is connected to an integral cleaner, and the integral cleaner is connected to a read-write control Logic; the read-write control logic is connected to the code DCO and the phase control logic, the phase control logic is connected to the code phase counter, and the code phase counter is connected to the carrier cycle phase counter and the carrier DCO.

[0016] After the processing module receives the spread-spectrum signal, it first releases the spectrum spread of the coded sequence on the transmitted informatio...

Embodiment 2

[0020] Such as figure 1 As shown, the hardware part of the present invention is made up of 10 functional modules: mixer (multiplier), pseudo-code correlator, integral cleaner, digital loop filter, code phase counter, carrier cycle phase counter, code delay Control circuit, code DCO, phase control logic, carrier DCO and read and write control logic.

[0021] When the present invention receives the spread spectrum signal, it first removes the spectrum spread of the coded sequence to the transmitted information data, obtains the carrier signal modulated by the information data, and then performs carrier demodulation to obtain the transmitted information. To realize the despreading of the received signal, it is necessary to completely align the local pseudo-code sequence generated by the receiver with the received pseudo-code sequence. Therefore, the receiver of the spread spectrum communication system is mainly composed of three parts: 1. Acquisition of the spread spectrum ...

Embodiment 3

[0023] Such as figure 2 As shown, the serial acquisition method of the present invention is also called sequential search. It assumes that in the search process, the code phase search step is a code phase unit, and the Doppler frequency shift search step is a Doppler frequency unit, then one code unit and one Doppler frequency shift unit constitute a two-dimensional signal search unit, which sequentially makes decisions on multiple two-dimensional search units. The process can be expressed as: the local signal generator of the receiver adjusts the code phase and Doppler frequency shift estimation, so that the generated signal is aligned with a certain search unit. If the signal is captured successfully, the search stops and the code tracking starts; if the signal If it is rejected, the code phase will step by one unit until the entire code domain is searched. If the signal has not been captured yet, the Doppler frequency is shifted by one unit, and the appeal process is re...

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Abstract

The invention relates to a zero-intermediate-frequency spread-spectrum receiver processing module. The processing module is composed of a frequency mixer, a pseudo-code correlator, an integral cleaner, a digital loop filter, a code phase counter, a carrier complete phase counter, a code delay control circuit, a code DCO, a phase control logic, a carrier DCO and a read-write control logic; the frequency mixer is connected to the pseudo-code correlator; the pseudo-code correlator is connected to the integral cleaner; the integral cleaner is connected to the read-write control logic; the read-write control logic is connected to the code DCO and the phase control logic; the phase control logic is connected to the code phase counter; and the code phase counter is connected to the carrier complete phase counter and the carrier DCO. By means of the zero-intermediate-frequency spread-spectrum receiver processing module disclosed by the invention, the design problem of a related despreading and demodulating circuit for received signals in a navigation system is solved; the disadvantages of low secrecy performance, poor anti-interference performance and the like in the traditional radio navigation system are overcome; and thus, high-precision, high-reliability and autonomous navigation positioning of important areas in important directions can be realized.

Description

technical field [0001] The invention relates to a signal processing system, in particular to a zero-IF frequency spread spectrum receiver processing module. Background technique [0002] There is an urgent need to develop a new type of radio navigation system: when a ship passes through complex sea areas such as narrow channels, shoals, hidden reefs, and underwater obstacles, the navigation and positioning of the ship must be very accurate. However, the current navigation systems serving Chinese ships all have corresponding problems, such as poor anti-interference ability, and will definitely not be used in future operations. There are positioning blind spots in key areas, poor real-time positioning, limited number of users, and ground center control systems. The attack will disable the system. Contents of the invention [0003] The present invention adopts the spread spectrum communication system, overcomes the shortcomings of traditional radio navigation systems su...

Claims

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Application Information

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IPC IPC(8): H04B1/30H04B1/711
CPCH04B1/30H04B1/711
Inventor 王树鑫
Owner HARBIN MIMI RICE IND TECH CO LTD
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