Mode and arrangement of dual-range synthesizer of a lettered frequency of the satellite navigational system glonass

FIELD: satellite navigation systems and may be used at construction of imitators of signals of satellite navigational system GLONASS and pseudo-satellites.

SUBSTANCE: for this purpose two oscillators of a lettered frequency and of a fixed frequency are used. Mode includes successive fulfillment of the following operations - generation of a stabilized lettered frequency, its multiplication with an oscillator's fixed frequency and filtration of lateral multipliers with means of filters of L1 and L2 ranges and corresponding option of a fixed and a lettered frequencies.

EFFECT: reduces phase noise and ensures synthesizing of lettered frequencies of L1 and L2 ranges of satellite navigational system from one supporting generator at minimum number of analogous super high frequency units.

3 cl, 1 dwg

 

The invention relates to satellite navigation and can be used in the construction of pseudo-satellites and simulated signals of satellite navigation system GLONASS.

Known frequency synthesizer containing connected to the tunable ring oscillator, mixer, intermediate frequency amplifier, the first frequency divider with a variable division ratio, a phase detector and lowpass filter, and the first reference frequency generator, the output of which is connected to another input of the phase detector, the second oscillator reference frequency and the harmonics generator, the output of which is connected to another input of the mixer, between the output of the second oscillator reference frequency and the input of the generator of harmonics included in the second frequency divider with peremennym division factor [1].

However, the known frequency synthesizer has restrictions on the continuity of overlapping ranges L1 and L2 satellite navigation system GLONASS and a large phase noise.

The objective of the invention is the reduction of phase noise and ensuring synthesizing lettered frequencies of L1 and L2 satellite navigation system GLONASS from a single reference oscillator with a minimum number of analog microwave sites, which will also reduce the size and weight of the device.

The problem is solved in that the device containing the generator is the PR reference frequency, the first and second frequency divider with a variable division ratio of the first phase detector, the first lowpass filter, a mixer, put the third, fourth, fifth frequency divider with a variable division ratio, the generator lettered frequencies, the generator of fixed frequency, a second phase detector, a second low pass filter, the first and second filters L1 and L2, and the output of the generator lettered frequencies are connected to the inputs of the first and second frequency divider with a variable division ratio, the output of the first frequency divider with variable division factor is first input of the mixer, and the output of the second frequency divider with variable division factor is the first input of the first phase detector, the output of which is connected to the input of the first low pass filter, the output of the first lowpass filter connected to the generator input lettered frequencies, the output of the reference oscillator is connected to the inputs of the third and fourth frequency divider with a variable division ratio, and the output of the third frequency divider with variable division factor is connected to the second input of the first phase detector and the output of the fourth frequency divider with variable division factor is first input of the second phase detector, the second input is connected to the input of the fifth Affairs is the indicator of the frequency with variable division factor, and the output is the input of the second low pass filter, the output of the latter is connected to the input of the generator of fixed frequency, the output of which is connected simultaneously to the input of the fifth frequency divider with variable division factor and to the second input of the mixer, and the mixer output is connected to inputs of the first and second filters L1 and L2, connected in parallel, and the outputs of the filters are output devices.

The proposed solution meets the criteria of the invention “novelty”because it differs from the prototype by the presence of new functionalities and new relationships between the elements.

The drawing shows a block diagram of the device dual-band synthesizer lettered frequency satellite navigation system GLONASS.

The device is dual-band synthesizer lettered frequency of the satellite navigation system GLONASS L1 and L2 comprises a generator lettered frequencies 1, the first, the second frequency divider with a variable division ratio of 2, 3, the first phase detector 4, the reference generator 5, the third frequency divider with variable division factor 6, a first low pass filter 7, a fourth frequency divider with variable division ratio of 8, the fixed frequency generator 9, the fifth frequency divider with variable division ratio of 10, the second fatwallet.com 11, the second low pass filter 12, a mixer 13, the first filter range L1 14, the second filter range L2 15. The generator output lettered frequencies are connected to the inputs of the first and second frequency divider with a variable division ratio, the output of the first frequency divider with variable division factor is first input of the mixer, and the output of the second frequency divider with variable division factor is first input of the first phase detector, the output of which is connected to the input of the first low pass filter, the output of the first lowpass filter connected to the generator input lettered frequencies, the output of the reference oscillator is connected to the inputs of the third and fourth frequency divider with a variable division ratio, and the output of the third frequency divider with variable division factor is connected to the second input of the first phase detector and the output of the fourth frequency divider with variable division factor is first input of the second phase detector, the second input is connected to the output of the fifth frequency divider with variable division factor, and the output is the input of the second low pass filter, the output of the latter is connected to the input of the generator of fixed frequency, the output of which is connected simultaneously to the input of the fifth frequency divider with variable division ratio of which to the second input of the mixer, the mixer output is connected to inputs of the first and second filters L1 and L2 connected in parallel, and the outputs of the filters are output devices.

Dual-band synthesizer lettered frequency bands L1 and L2 satellite navigation system GLONASS operates as follows.

The proposed dual-band synthesizer lettered frequency generator includes lettered frequency and the fixed frequency generator, the frequency of which is stabilized with an accuracy of fractions of a degree in phase with the single reference oscillator known scheme-locked loop [2] using a phase detector and lowpass filter. Generator lettered frequencies 1 generates lettered frequency on the intermediate frequency, which is then transferred to the operating range by multiplication in the mixer 13 with a fixed frequency fixed frequency generator 9 and subsequent filtering the first and second band filters connected in parallel.

The frequency of the local oscillator lettered frequencies are chosen so that the mirror channels of both bands do not fall within the zone of transparency of the filters that allows you to get rid of the microwave switches-band filters. In order to narrow the bandwidth of the generator lettered frequencies at its output the first power divider with variable division factor (DPCD), changing the ratio defined who I am which can be switched from one band to another, without changing the tuning range of the oscillator lettered frequencies.

The device is dual-band synthesizer lettered frequency satellite navigation system GLONASS switching frequency range by changing the division factor of the first frequency divider with a variable division ratio of the first and second filters L1 and L2 do not switch and connected in parallel, the generator frequency is a fixed frequency fGequal 1358 MHz and the divide ratios of m=1, k=4.

The way dual-band synthesizing lettered frequency satellite navigation system GLONASS includes sequentially performed synthesis with increased frequency step adjustment, multiplying it with the frequency of the local oscillator and the filter side components through the first and second filters L1 and L2.

In the proposed method, the formation of a grid of frequencies L1 and L2 by using two generators: lettered frequency and fixed frequency.

The choice of frequencies and ratios calculated according to the formula (1).

where fOUT- frequency output signal;

fGthe oscillator frequency fixed frequency;

fn- frequency generator lettered frequencies;

m - division ratio DPCD for a range L1;

k - ratios are the NT division DPCD for a range L2.

Synthesized frequency fnwith uvelichennym step adjustment and is fed to the input of the first divider with peremennym division factor (DPCD). Divided frequency is fed to the mixer, where it is multiplied by the fixed frequency of the corresponding oscillator. By-products of the conversion are sent to the input in parallel is included in the range of filters that suppress unused spectral components.

This method allows you to use the frequency comparison dual-band synthesizer lettered frequencies greater than the resolution adjustment that reduces the phase noise of the synthesizer; to use the same fixed frequency fixed frequency generator for both ranges; to perform switching of the range digital circuits at low frequency by changing the division factor of the frequency divider.

Thus, the proposed dual-band synthesizer lettered frequency bands L1 and L2 satellite navigation system GLONASS contains only two passive (band filters ) and two active microwave site: generator of fixed frequency, and a mixer. Generator lettered frequencies operates on the intermediate frequency. Other components of the circuit can be implemented within a single digital chip, except for the first and second low-pass filters and the priori generator.

An additional effect is that the proposed device allows you to get rid of any switches for microwave circuits and to produce a better shielding of these circuits when used in highly sensitive measuring equipment (simulators signals of satellite navigation systems), to suppress out-of-band radiation in the transmitting equipment (pseudo-satellites) with a low level of phase noise of the output signal.

Sources of information

1. USSR author's certificate No. 814236, CL N 03 In 21/02, 1979.

2. McKellen, Wetblanket, Ulator, Rymaruk. Handbook of training design receiving and amplifying devices. 2nd ed. - Kiev: visa SHK., 1988. - 196.

1. The method of synthesis of the two ranges lettered frequency satellite navigation system GLONASS, including consistent implementation of the following operations is the generation of a stable lettered frequency multiplying it with a fixed frequency local oscillator and filtering lateral components through the filters range L1and L2, characterized in that the fixed frequency and stable lettered frequency are selected according to the formula ratio:

where fout- frequency output signal;

fGthe oscillator frequency fixed frequency;/p>

fn- stable lettered frequency;

m - division ratio range L1;

k - division ratio range L2.

2. The device is dual-band synthesizer lettered frequency satellite navigation system GLONASS, containing the reference frequency generator, the first and second frequency divider with a variable division ratio of the first phase detector, the first low pass filter, the mixer, characterized in that it includes the third, fourth, fifth frequency divider with a variable division ratio, the generator lettered frequencies, the generator of fixed frequency, a second phase detector, a second low pass filter, the first and second filters L1 and L2, and the output of the generator lettered frequencies are connected to the inputs of the first and second frequency divider with a variable division ratio, the output the first frequency divider with variable division factor is first input of the mixer, and the output of the second frequency divider with variable division factor is first input of the first phase detector, the output of which is connected to the input of the first low pass filter, the output of the first lowpass filter connected to the generator input lettered frequencies, the output of the reference oscillator is connected to the inputs of the third and fourth frequency dividers with premedikatsiya division, moreover, the output of the third frequency divider with variable division factor wired to the second input of the first phase detector and the output of the fourth frequency divider with variable division factor is first input of the second phase detector, the second input is connected to the fifth input of the frequency divider with a variable division ratio, and the output is the input of the second low pass filter, the output of the latter is connected to the input of the generator of fixed frequency, the output of which is connected simultaneously to the input of the fifth frequency divider with variable division factor and to the second input of the mixer, and the mixer output is connected to inputs of the first and second filters L1 and L2 connected in parallel, and the outputs of the filters are output devices.

3. The device is dual-band synthesizer lettered frequency satellite system GLONASS according to claim 2, characterized in that the switching frequency range is produced by changing the division factor of the first frequency divider with a variable division ratio, and the first and second filters L1 and L2 do not switch and connected in parallel, the frequency fGequal 1358 MHz and the divide ratios of m=2, k=4.



 

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