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Signal generator and signal generation method for radio navigation systems with hopping spread systems

A technology for radio navigation and system signals, which is applied in the field of signal generators in the radio navigation system of the spread hop system, and can solve the problems of frequency bandwidth and multiple frequency points

Inactive Publication Date: 2009-12-02
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional radio navigation system of the spread hopping system uses pseudo-random codes to control carrier hopping for frequency hopping modulation. Generally, the frequency band is relatively wide, and there are many frequency points. The probability of repeated collisions between self-multipath and mutual multiple-access frequency points is relatively high. , not applicable to the radio navigation system of the extended jump system

Method used

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  • Signal generator and signal generation method for radio navigation systems with hopping spread systems
  • Signal generator and signal generation method for radio navigation systems with hopping spread systems
  • Signal generator and signal generation method for radio navigation systems with hopping spread systems

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specific Embodiment approach 1

[0020] Specific embodiment one: combination figure 1 with figure 2 This embodiment will be described. Spread-hop system radio navigation system signal generator consists of encoder 1, DS modulator 2, DS pseudo code generator 3, clock f c 4. Frequency hopping modulator 5, frequency synthesizer 6 and frequency hopping sequence generator 7. The output terminal of encoder 1 is connected to the input terminal of DS modulator 2, and the clock f c The output terminals of 4 are respectively connected to the input terminals of the DSPS pseudo code generator 3 and the frequency hopping sequence generator 7, and the output terminals of the DS pseudo code generator 3 are connected to the input terminals of the DS modulator 2. The output terminal is connected to the input terminal of the frequency hopping modulator 5, the output terminal of the frequency hopping sequence generator 7 is connected to the input terminal of the frequency synthesizer 6, and the output terminal of the frequency sy...

specific Embodiment approach 2

[0022] Specific implementation manner two: combination figure 1 , 2 , 3, 4, 5 and 6 illustrate this embodiment. The difference between this embodiment and the first embodiment is: the DS pseudo code adopts an m sequence with a period of 8191, and the DS pseudo code generator 3 adopts a 13-stage linear feedback shift register with 1, 3, 4, and 13 taps. , The initial phase is any non-zero value, which can be 1FFF. The feedback logic of the 13-level non-degenerate linear feedback shift register can be expressed by a 13th degree polynomial on the binary field GF(2)

[0023] f(x)=1+x+x 3 +x 4 +c 13 x 13 (1)

[0024] Equation (1) is called the characteristic polynomial of the linear shift register.

[0025] For dynamic linear shift registers, the feedback logic can also be expressed by the recursive relationship of linear shift registers

[0026] a 0 = C 1 a 1 +c 3 a 3 +c 4 a 4 +c 13 a 13 (2)

[0027] The frequency hopping sequence generator 7 is composed of a counter 7-1, a f...

specific Embodiment approach 3

[0041] Specific implementation mode three: combination Figure 6 with Figure 7 This embodiment will be described. The difference between this embodiment and the second embodiment is: DDS 6-1 consists of frequency control word module 6-1-1, phase accumulator 6-1-2, sine-cosine signal memory 6-1-3, D / A conversion It is composed of 6-1-4 and low-pass filter 6-1-5. The output terminal of the frequency control word module 6-1-1 is connected to the input terminal of the phase accumulator 6-1-2, and the output terminal of the phase accumulator 6-1-2 is connected to the input terminal of the sine and cosine signal memory 6-1-3, The output terminal of the sine and cosine signal memory 6-1-3 is connected to the input terminal of the D / A converter 6-1-4, and the output terminal of the D / A converter 6-1-4 is connected to the low-pass filter 6-1-5的input terminal.

[0042] Clock f c 4 is a stable crystal oscillator, use it to synchronize the various components of the entire frequency synthesize...

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Abstract

The invention provides a signal generator and a signal generation method for radio navigation systems with hopping spread systems. The signal generator consists of an encoder, a direct spread modulator, a direct spread pseudo-code generator, a clock, a frequency hopping modulator, a frequency synthesizer and a frequency hopping sequence generator. An information signal is changed into a digital information sequence through the sampling, quantification and encoding of the encoder and enters the direct spread modulator, the direct spread pseudo-code generator generates a direct spread pseudo-code under the driving of a clock signal, the direct spread pseudo-code is sent to the direct spread modulator, the direct spread pseudo-code modulates the information sequence in the direct spread modulator and outputs a direct spread signal to the frequency hopping modulator, the frequency hopping sequence generator outputs a frequency hopping sequence under the driving of the clock signal, the frequency hopping sequence controls the frequency synthesizer to produce hopping carrier which is output to the frequency hopping modulator, and the hopping carrier modulates the direct spread signal in the frequency hopping modulator and outputs a frequency hopping spread signal. The signal generator is particularly applicable to the radio navigation systems with the hopping spread systems.

Description

(1) Technical field [0001] The invention relates to a radio navigation device, in particular to a signal generator applied in a radio navigation system of a spread-hop system. The invention also relates to a signal generation method based on the signal generator in the spread-hop radio navigation system. (2) Background technology [0002] Radio navigation systems play an important role in aviation and navigation, and can provide users with fast and reliable navigation and positioning information. Radio navigation systems are divided into two types: pulse phase system and direct spread system. The pulse phase radio navigation system has low positioning accuracy, poor confidentiality, and is easily interfered by the outside world. The anti-jamming capability of the direct-spread radio navigation system is greatly enhanced, but the direct-spread system has serious near-to-far effects and poor anti-narrowband interference. The anti-interference and anti-interception capabilities need...

Claims

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Application Information

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IPC IPC(8): G01S5/02H04B1/69H04B1/707
Inventor 徐定杰赵彦雷沈锋王伟赵彦明尹荣荣吴述敏孙伟叶增韩续红
Owner HARBIN ENG UNIV