KR20010024651A - Device for reception of signals from satellite radio navigation systems - Google Patents

Abstract

PURPOSE: A device for receiving a signal from a satellite radio navigation system is provided to supply a device for receiving and converting SRNS GPS" signal of the frequency band L1 and "Glonass" signal of the frequency band L2 at the same time by using a common composite instrument generating the clock signal and the heterodyne frequency signal. CONSTITUTION: A device for receiving a signal from a satellite radio navigation system includes an input instrument(1) and a converting instrument(2), the first frequency converter. The first frequency converter is composed of the first amplifier(3) connected in series, a composite instrument(4), the second amplifier(5), a generating instrument(8) generating the clock signal and the heterodyne frequency signal, the first channel(6) and the second channel(7). The channel(6) of the second frequency converter is composed of a filter(9) and a composite instrument(10) and the channel(7) of the second frequency converter is composed of a filter(11) and a composite instrument(12). In the channel(6) of the second frequency converter, the output step of the composite instrument(10) is connected to the input of a threshold instrument(14), the output of SRNS GPS" signal through a gain controlling amplifier(13). In the channel(7) of the second frequency converter, the output step of the composite instrument(12) is connected to the input of a threshold instrument(16), the output of "Glonass" signal through a gain controlling amplifier(15).

Description

Device for reception of signals from satellite radio navigation systems

Reference literature is as follows. [1] "Built-in devices for satellite radio navigation", I.V. Kudryavtesev, I.N. Mishchenko, A.I. Volynkin et al., Loscow., Transport, pages 13-15, 1988; [2] "Network Satellite Wireless Navigation System", V.S. Shebashaevich, P.P. Dmitriev, N.V. Ivantsevich et al., Loscow, Radio I Svyaz, 1993, p. 35.

(NISC) / SRNS Signals sent by Earth's satellites, such as "GPS," are the (C / A) in-phase code and the "P" in-phase code (0, π) and (+ π / 2, -π / Is a radio signal modulated by 2). These signals are transmitted in two frequency bands: region L ₁ (carrier frequency 1575.42 MHz) and region L ₂ (carrier frequency 1227.6 MHz). The signal in the frequency band L ₁ is modulated by the "C / A" code and the "P" code, and the signal in the frequency band L ₂ is modulated by the "P" code. The first code ("C / A" code) is generated by a pseudorandom sequence (PRS) scheme with a period of 1 Hz and a clock frequency of 10.023 MHz. The second code ("P" code) has a period of about 7 days. And a pseudo random sequence (PRS) scheme with a clock frequency of 10.23 MHz. The "C / A" code, transmitted in the frequency band L ₁ and known as the "standard precision" code, is open to all customers using navigational information and is used in "standard precision" radio navigation equipment including the device according to the claims of the present invention. do. On the other hand, the "D" code is used for special equipment with higher precision.

In order to confirm the signals emitted from the various NIS3 satellites, code division of SRNS "GPS" is used.

In contrast to SRNS "GPS", in the "Glonass" pseudorandom sequence (see, eg, Cited Invention [2], pages 28-30), signals broadcast on different NIS3s are frequency-divided. The NIS3 SRNS "Glonass" signal is identified by the nominal value of the carrier ("literal") frequency in the predetermined frequency range. Two (j = 1, 2) frequency bands F ₁ and F ₂ are assigned to the "literal" frequency. Name the literal frequencies according to the following rules:

Where f _{j, i} is the number of the literal frequency;

f _{j, 0} is a zero character frequency;

i is the number of characters in each band;

Δf _j is the interval between the literal frequencies;

Frequency F ₁ (near 1600 MHz)-f _1,0 = 1602 MHz, Δf ₁ = 0.5625 MHz;

Frequency F ₂ (near 1240 MHz)-f _2,0 = 1246 MHz, Δf ₂ = 0.4375 MHz.

Among the active NIS3 satellites, the literal frequency is assigned by a predetermined station transmitted in a control information frame.

Like the "GPS" satellite radio navigation system, each NIS3 in the "Glonass" satellite radio navigation system signals in both frequency bands F ₁ and F ₂ . In the frequency band F ₁ , the SRNS "Glonass" signal is modulated by two PRS codes: "standard precision" (clock frequency 0.511 MHz) and "high precision" (clock frequency 5.11 MHz). That is, the frequency band F ₂ modulates the "C / A" and "P" codes with the code of the frequency band L ₁ of the SRNS "GPS" signal of the "Glonass" SRNS, and the SRNS "GPS" signal in the frequency band L ₂ . Is modulated with only a high precision PRS code. The "standard precision" code transmitted in the frequency band F ₁ is open to all navigation information users and is used in "standard precision" radio navigation equipment, including the device claimed in the present invention. On the other hand, "high precision" cords are typically used for special high precision equipment.

Between SRNS "GPS" and "Glonass" signals coded into one carrier in SRNS "GPS" and SRNS "GPS" and "Glonass" signals frequency-divided into several carriers defined as literal frequencies in SRNS "Glonass". The difference results in a difference in the technical means used to receive the signal of the satellite radio navigation system in order to convert the signals to enable radio navigation measurements in the next step.

For example, as can be seen with the "Global Positioning System (GPS) Receiver RF Shear Analog-to-Digital Converter" of the Rockwell World Title Information Order Number, registered May 31, 1995, Figure 1 [3] shows the SRNS "GPS". "Shows an apparatus for receiving a signal from. The receiver comprises a low noise amplifier, a filter, a first mixer, a first intermediate frequency amplifier, a quadrature mixer, two quantizers for in-phase and orthogonal channels, a first heterodyne oscillator (1401.51 MHz), and a first heterodyne And a divider forming a second heterodyne frequency signal from the frequency signal.

The receiving device performs the task of receiving and converting the SRNS "GPS" signal in such a way that the user can later perform the corresponding radio navigation measurement. However, this device does not receive SRNS "Glonass" signals.

As a reference, "Artificial Radio Navigation Network System" (VS Shebshaevich, PP Dmitrriev, HV Ivantsevich, et al., Loscow, Radio I Syaz Publisher, 1993, pp. 147-148 [2]) receives SRNS "Glonass" signals. Device ("Single channel equipment for ASN-37 users"), which includes an input filter, a low noise amplifier, a first mixer, an intermediate frequency amplifier, a phase demodulator, and a second mixer with phase concealment of mirror channels. And a local oscillator for generating a heterogeneous frequency signal, which generates an output signal in accordance with the literal frequency of the received SRNS "Glonass" signal. The equation frequency interval is obtained by multiplying the output frequency signal of the synthesizer by four, and the second heterodyne frequency signal is obtained by dividing two by the synthesizer output frequency signal.

The device is responsible for receiving and converting SRNS "Glonass" signals in a form that allows the user to perform the corresponding radio navigation measurements. However, this device does not overcome the problem of receiving SRNS "GPS" signals.

Despite the differences between the SRNS "GPS" and "Glonass", the trajectory configuration and frequency bands of the NIS3 satellite's orbits are the same, so that they are concerned with building integrated navigational equipment for users who use signals from both of these radio navigation systems. Solve the problem. Therefore, it is possible to select the working position of NIS3 with the best geometrical factors, thus achieving high reliability and precision in object positioning (see "Network satellite radio navigation system", VS Shebashaevich, PP Dmitriev, NV Ivantsevich et al. , loscow, Radio I Svyaz, 1993. 160 pages, [2]).

Among these known devices, some receive SRNS "GPS" signals in the frequency band L ₁ and "Glonass" signals in the frequency band F ₁ , and receive the received signals using a digital processor (primary navigation processor), followed by a continuous flux. Converts to a form that allows navigational measurements and the positioning of objects ("Network Satellite Radio Navigation System", VS Shebashaevich, PP Dmitriev, NV Ivantsevich et al., Loscow, Radio I Svyaz, 1993. pages 158-161 [2], FIGS. 9 and 8). The device includes a frequency divider ("duplexer") that divides the "GPS" and "Glonass" signals, a satellite radio navigation system, a bandpass filter, a low noise filter, mixer, SRNS "for" GPS "and" Glonass "channels. And a SHF switch for applying a GPS "signal or a" Glonass "signal to the mixer's signal input stage, and a SHF switch for applying the first heterodyne signal of the" GPS "channel or" Glonass "channel to the mixer's reference input terminal. Because of the corresponding frequency waveform of the heterodyne signal, the first intermediate frequency is constant for SRNS "GPS" and "Glonass", and the following channels of the device are common to these signals.

A feature of such a device is that the reception and conversion of the SRNS signal is continuously performed on time using the same radio channel, thus increasing the time required for subsequent processing to obtain navigation information. In addition, the implementation of the device requires a complex high frequency conversion frequency synthesizer that will generate two different heterodyne signals, each of which is used to convert SRNS "GPS" and "Glonass" signals.

In addition, other conventional devices for receiving SRNS "GPS" and "Glonass" signals include Riley S., Howard N., Aardoom E., Daly P., Silverstrin P. "Complex GPS / GLONASS high density for spatial applications. Receiver ”, September 12-15, 1995, Palm Springs, California, USA, ION GPS-95 Bulletin, pages 835-844, FIG. 2 [4]. The device can simultaneously receive SRNS "GPS" and "Glonass" signals. The functionally completed part of this device solves the problem of receiving SRNS "GPS" signals in frequency band L ₁ and "Glonass" signals in frequency band F ₁ and produces an output signal for use in navigational measurements. do.

1 is a block diagram illustrating a conventional receiving apparatus.

The apparatus consists of an input device 1 whose input end is a signal input end of the device and an input device 2 of the first signal frequency converter. The input device 2 comprises a first amplifier 3, a mixer 4 and a second amplifier 5 connected in series, a first channel 6 and a second channel 7 of a second signal frequency converter, and Module 8 for generating a clock signal and a heterodyne frequency signal. Module 8 consists of one independent clock generator and three devices or frequency synthesizers (not shown in FIG. 1) for generating heterodyne frequency signals.

The channel 6 of the second frequency converter consists of a filter 9 and a mixer 10 connected in series, and the channel 7 of the second frequency converter consists of a filter 11 and a mixer 12 connected in series.

The input ends of the filters 9, 11 are respectively the input ends of the first channel 6 and the second channel 7 of the second signal frequency converter and the output end of the amplifier 5, ie the first signal frequency converter 2. It is connected to the output of the device. The input of the amplifier 3, ie the input of the device 2, is connected to the output of the device 1. The reference input of the mixer 4 of the device 2 of the first signal frequency converter is connected to the signal output of the first heterodyne frequency of the module 8 formed by the signal output of the first heterodyne frequency (FIG. 1). Not shown). The reference inputs of the mixers 10 and 12 of the first channel 6 and the second channel 7 of the second signal frequency converter are driven by the output of the corresponding device generating signals of the second and third heterodyne frequencies. Respectively connected to the outputs of the second and third heterodyne frequency signals of the formed module 8 (not shown in FIG. 1).

Modules generated at the output of the mixers 10 and 12 of the first and second channels 6 and 7 of the second signal frequency converter and at the output of the clock frequency signal generator (not shown in FIG. The clock frequency signal of 8) is the output of the device according to the prior art.

The operation of the device according to the prior art is as follows.

SRNS "GPS" signal of frequency band L ₁ and "Glonass" of frequency band F ₁ outputted from an antenna (not shown in FIG. 1) through an input device 1 for frequency filtering a signal having a predetermined frequency band. The signal is applied to the input of the device 2 of the first signal frequency converter.

In the apparatus 2, the SRNS "GPS" and "Glonass" signals of the frequency band L1 (F ₁ ) are amplified in the first amplifier 3 and converted by frequency in the mixer 4, and then the second amplifier ( 5) Amplified in (intermediate frequency amplifier).

For the first frequency conversion performed in the device 2, the device uses a signal of the first heterodyne frequency f _a1 = 1416 MHz input from the corresponding output of the module 8. In module 8, the signal of the first heterodyne frequency f _a1 is synthesized with the aid of an independent device, ie a first frequency synthesizer (not shown in FIG. 1), which generates a signal of the first heterodyne frequency. .

The SRNS "GPS" and "Glonass" signals of the frequency band L1 (F ₁ ) converted in the device 2 are input at the inputs of the first and second channels 6 and 7 of the second signal frequency converter, i.e. filter (9) is applied to the input terminal of (11). Each of these filters processes a signal corresponding to one SRNS. That is, the filter 9 filters the SRNS "GPS" signal, and the filter 11 filters the SRNS "Glonass" signal.

The frequency converted signals are filtered by filters (9) (11) to separate them from out-of-band interference and are assigned to the systems ("GPS" and "Glonass") in each of channels (6) (7) and the signals are respectively mixer 10 12 is input to the signal input terminal.

In order to perform a second frequency conversion on channels 6 and 7, the conventional receiving device is a second and third coupled to the corresponding independent device, ie module 8, which generates second and third heterodyne frequencies. Second and third heterodyne frequencies (f _a2 = 173.9 MHz, f _a3 = 178.8 MHz) signals synthesized by a frequency synthesizer (not shown in FIG. 1) are used. Therefore, the signal of the second heterodyne frequency f _a2 = 173.9 MHz is used for the conversion of the SRNS "GPS" signal in the mixer 10 of the first channel 6 and the third heterodyne frequency f _a3 = 178.8 MHz) is used for conversion of the SRNS "Glonass" signal in mixer 12 of the second channel 7.

The SRNS "GPS" and "Glonass" signals converted by the mixers 10 and 12 are applied to the channel 6 and the channel 7, respectively.

SRNS "GPS" signals converted by frequency in channels 6 and 7, including clock signals generated in module 8 by independent clock generators (e.g., quartz controlled oscillators (not shown in Figure 1)). The Glonass "signal forms the output signal of a conventional device.

The output signal of the conventional device is used to perform radio navigation measurements to obtain corresponding navigation information. At this time, the output signal is first digitally processed by a 4-bit analog-to-digital converter (ADC), a dedicated digital filter and a special calculator (not shown in FIG. 1). The clock signal generated by the device is in this case used as the clock signal to set the sampling rate when performing analog-to-digital conversion.

In order to perform digital processing without losing navigational information, the output signal of a conventional device is matched by its frequency and spectrum. Matching is performed by selecting a predetermined clock frequency and a heterodyne frequency. When doing this in a conventional device, the clock frequency of the next analog-to-digital conversion, i.e., the sampling rate over time, is chosen as f ₀ = 57.0 MHz. Considering this frequency, the hetero frequency (f _a2 = 173.9 MHz, f _a3 = 178.8 MHz) for the second frequency conversion of the signal is selected, so that the average frequency of the SRNS "GPS" and "Glonass" signals on the second intermediate frequency. Is close to 14.25 MHz. This confirms the digital processing potential in the 4-bit ADC, where the clock frequency is selected such that f ₀ = 57.0 MHz (4 x 14.25 MHz) and at a frequency of 28.5 MHz (2 x 14.25 MHz) using a dedicated digital filter. Allocate two bit in-phase and orthogonal samples [pages 4, 837].

Therefore, in the device according to the prior art, the following clock signal and heterodyne frequency signal are generated: a clock frequency of 57.0 MHz, a first heterodyne frequency of 1416 MHz, a second heterodyne frequency of 173.9 MHz, a first of 178.8 MHz 3 heterodyne frequency.

Generation of the heterodyne frequency signal is performed by a local oscillator. At this time, the complexity of the local oscillator is high because the heterodyne frequency simply cannot be multiplied or divided from other heterodyne frequencies used in the conventional apparatus. The heterodyne frequency is thus synthesized by a heterodyne frequency synthesizer (not shown) embedded in the module 8. This synthesizer is complicated by the high requirements on the stability of the synthesized frequencies (the relative frequency instability is 10 ^-11 to 10 ^-12 per second. [5]), which greatly affects the output characteristics of the receiving device. Independent radio parts are determined.

The use of complex heterodyne devices (three independent frequency synthesizers) and high clock frequencies (57.0 MHz) in a standard device adds to the complexity of the digitization device and positions using SRNS "GPS" and "Glonass" signals. It is difficult to use the conventional technique as a portable (pocket) receiving device.

In this regard, it is obvious that the number of frequency synthesizers should be reduced in order to simplify the apparatus for generating clock signals and heterodyne signals. The implementation of small receiver-indicators that are convenient to position with the SRNS "GPS" and "Glonass" signals depends on solving this problem, which is typically a portable (pocket) receiver-indicator for widespread use. This is especially important in the case of.

FIELD OF THE INVENTION The present invention relates to the field of wireless navigation, which can also be used for navigational equipment of users of satellite navigation systems (SRNS), and in particular can receive signals such as SRNS "GPS" (United States) or "Glonass" (Russian Federation) simultaneously. A radio receiver.

The feasibility and industrial use of the present invention is shown in the following figures and frequencies in FIGS.

1 is a block diagram of a device according to the prior art

2 is a block diagram of an apparatus according to an embodiment of the present invention.

FIG. 3 is a frequency diagram showing frequency band allocation of an SRNS "GPS" signal received in the frequency domain L ₁ and a "Glonass" signal received in the frequency region L ₂ before performing the first frequency conversion.

4 is a frequency diagram showing frequency band allocation of SRNS "GPS" and: Glonass "signals after first frequency conversion in the apparatus of the present invention;

FIG. 5 is a frequency diagram showing frequency band allocation of an SRNS "GPS" signal (FIG. 5A) and a "Glonass" signal (FIG. 5B) after a second frequency conversion in the apparatus of the present invention.

The primary purpose of the present invention apparatus for receiving a clock signal and the "Glonass" signals of the SRNS "GPS" signals and the frequency band L ₂ in the frequency band L ₁ by using one common synthesizer for generating a heterodyne frequency signal at the same time and convert To provide. At this time, the clock frequency of the generated signal coincides with the spectrum of the SRNS "GPS" and "Glonass" signals converted in the device.

In order to achieve the above object of the present invention, an apparatus for receiving a signal of a satellite radio navigation system includes: an input terminal is a signal input terminal of the apparatus and an output terminal is connected to a first signal frequency converter, and the input terminal of the first signal frequency converter is connected. A first amplifier having an input stage and a mixer and a second amplifier are connected in series, and an output terminal of the second amplifier of the first signal frequency converter is connected to the first channel and the second channel of the second signal frequency converter, An input device, each channel consisting of a filter and a mixer, the input of which is an input of a corresponding channel of the second signal frequency converter; A generator for generating a signal of a first heterodyne frequency; And a module for generating a clock frequency signal and a signal of a heterodyne frequency. The signal output of the first heterodyne frequency is connected to the reference input of the mixer of the first signal frequency converter and the signal output of the second heterodyne frequency is connected to the reference input of the mixer of the first channel of the second signal frequency converter. The output terminal of the channel of the second signal frequency converter and the signal output terminal of the clock and heterodyne frequencies are the output terminals of the receiving device. A device for generating a clock and a heterodyne frequency signal is connected in series with a device for generating a first heterodyne frequency signal and divides the frequency by 8 and 2 ^N (where N = 1,2,3), respectively; And a second frequency divider. The output stages of the first and second frequency dividers are an input of a second heterodyne frequency signal and an output of a clock frequency signal of the device for generating a clock and a heterodyne frequency signal. In this case, the signal output of the second heterodyne frequency is connected to the reference input of the mixer of the second channel of the second signal frequency converter. In each of the channels of the second signal frequency converter, the mixer output stage is connected to the channel output stage via a serially connected gain control amplifier and threshold device.

In the apparatus for receiving a signal of a satellite radio navigation system, the input device is configured in the form of a first band filter, an amplifier and a second band filter in series. Here, the control input of the control input of the gain control amplifier and the threshold devices of the two channels of the second signal frequency converter are connected to the output of the corresponding digital-analog converter, and the input of the digital-analog converter is the control input of the device. The threshold devices of the two channels of the second signal frequency converter are configured in the form of a level controlled 2-bit quantizer.

As shown in Fig. 2, the apparatus of the present invention consists of an input device 1 whose input end is a signal input end of the device and a converter 2 which is a first frequency converter for converting a signal. The first frequency converter comprises a first amplifier 3, a mixer 4 and a second amplifier 5 connected in series, a generator 8 for generating a clock signal and a heterodyne frequency signal, and a first channel 6 And the second channel 7. The channel of the second frequency converter 6 consists of a filter 9 and a mixer 10 connected in series, and the channel of the second frequency converter 7 consists of a filter 11 and a mixer 12 connected in series.

In the channel of the second frequency converter 6, the output of the mixer 10 is connected via the gain control amplifier 13 of the threshold device 14, the output of which is the output of the channel 6, that is, the output of the SRNS "GPS" signal. It is connected to the input.

In the channel of the second frequency converter 7, the output of the mixer 12 is connected via the gain control amplifier 15 of the threshold device 16 whose output is the output of the channel 7, ie the output of the SRNS "Glonass" signal. It is connected to the input.

In this embodiment of the device according to the invention, the threshold devices 14, 16 of the channels 6, 7 of the second frequency converter are in the form of a 2-bit quantizer.

In this embodiment, the input device 1 has a form in which the first band filter 17, the amplifier 18, and the second band filter 19 are connected in series.

In the apparatus of the present invention, the module 8 for generating the clock signal and the heterodyne frequency signal comprises the apparatus 20 for generating the first heterodyne frequency signal (synthesizer of the first heterodyne frequency signal) and the frequency band of 8. It is in the form of a series circuit composed of a first device 21 for dividing and a second device 22 for dividing the frequency band into 2 ^N (where N = 1, 2, 3).

In this embodiment, the apparatus 20 for generating the first heterodyne frequency signal has a form in which the reference frequency generator 23 and the voltage control generator 25 of the phase synchronizer 24 are connected in series. The output end of the generator 25, which is the output end of the input device 20, is also connected to the second input end of the phase synchronizer 24. Here, the third input terminal of the phase synchronizer 24 is an input terminal of a control signal input from a digital processing apparatus, that is, a marine digital processor (not shown in FIG. 2).

In module 8, the output of the device 20 is the output of the first heterodyne frequency signal, the output of the device 21 is the output of the second heterodyne frequency signal, and the output of the device 22 is the clock signal. Output.

The inputs of the filters 9 and 11 are the inputs of the first channel 6 and the second channel 7 of the second signal frequency converter and are connected to the output of the amplifier 5. The output of the amplifier 5 is connected to the output of the device 92 of the first signal frequency converter.

The input of the amplifier 3, which is the input of the device 2, is connected to the output of the device 1, ie the output of the filter 19.

The reference input of the mixer 4 of the first signal frequency converter device 2 is connected to the first heterodyne frequency output of the device 8 connected to the output of the first heterodyne frequency generator 20.

The reference input of the mixers 10 and 12 of the second frequency converter channels 6 and 7 is connected to the signal output of the second heterofrequency device 8 which is connected to the output of the device 21 which divides the frequency by eight. have.

In this embodiment, the control output stages of the amplifiers 13 and 15 are connected to the output stages of the corresponding digital-to-analog converters (DACs) 26 and 27, the input stage of which is a digital signal input for automatic gain control (AGC) of the amplifier. have.

In this embodiment, the control inputs of the threshold devices, which are 2-bit quantizers 14 and 16 for each level, are output terminals of the corresponding DACs 28 and 29, which are digital signal inputs for which the inputs automatically balance the threshold values of the threshold devices. Is connected to.

The input of the DAC 26-29 is the control input of the device.

The device of the present invention is implemented on the basis of sequentially produced standard wireless electronic components.

Therefore, the input device 1 consisting of the band filters 17 and 19 and the amplifier 18 is, for example, using a standard ceramic filter that performs the function of the band filter and an amplifier such as Hewlett Packard's MGA-87563. I can make it.

The device 2 consisting of a first signal frequency converter coupled with the generator 25 included in the structure of the device 20 and the amplifier 3 and the mixer 4 are based on a chip such as MC13142 from Motorola, The amplifier 5 of the device 2 can be made by mounting a chip such as NEC's UPC2715.

Filters 9 and 11 included in channels 6 and 7 of the first frequency converter may be in the form of bandpass filters of surface acoustic waves (SAW) as described in [6, pages 217-220]. ; The mixers 10 and 12 and the gain control amplifiers 13 and 15 can be made based on NEC's chip type UPC2753; Threshold devices 14 and 16 (2-bit level quantizers) can use Maxim's dual comparator type MAX962.

The digital-to-analog converters 26-29 are implemented with quartz 8-bit DACs, such as Maxim's MAX533.

The reference frequency generator 23 contained within the device 20 can be made in the form of a quartz controlled oscillator that generates a signal having a frequency of 15.36 MHz. In particular, it is possible to use a quartz controlled thermal compensation generator such as TEMPUS-LVA from Motorola. The phase synchronizer 24 contained within the device 20 can be made using a chip such as National Semiconductor's LMX2330, and can perform input frequency dividers, reference frequency dividers, phase detectors, buffers, and closed loop phase synchronization operations. It consists of internal registers. The frequency division factor of the divider of the device 24 is determined by an external signal or by a digital code input from the digital signal processing device, i.e., the digital navigation processor (not shown in FIG. 2), to the third input of the device 24. It is decided. The division factor of the divider is preset from a predetermined relationship between the mood frequency (15,36 MHz) and the first heterodyne frequency (1413.12 MHz). The division factor of the reference frequency is 8, the frequency division factor of the generator 25 is 736, and the matching frequency is 1.92 MHz. The phase detector of the device 24 generates a voltage corresponding to the phase error of the reference frequency generated at the output terminal of the frequency divider of the generator 25 (chip mc13142 of Motorrolla) and the generator 23. The reference frequency of the generator 23 is used to adjust the frequency of the generator 25 with the aid of a control element (berry cap). This voltage is applied to the berry cap of the generator 25 via an RC-filter included in the device 24 to provide the transfer characteristics of a phase locked closed loop with a band of 50 Hz. The design of the device 20 for generating the first heterodyne frequency signal thus corresponds to the standard scheme of a frequency synthesizer as described in [7, pages 2-3 ... 2-14, FIG. 6].

The apparatuses 21 and 22 for dividing the frequency into 8 and 2 ^N (where N = 1,2,3) are the motor frequency divider MC12095 of Motorola with division factor of 2 and the motor divider of Motorrolla with division factor of 4 It can be implemented with MC12093.

The operation of the device according to the invention is to receive and convert the SRNS "GPS" and "Glonass" signals, when a literal frequency of i = 0 to i = 12 is used in the SRNS "Glonass" signal. These literal frequencies are used according to the "Interface Control Document" [8].

The apparatus according to the present invention performs the following operations.

The SRNS " GPS " and " Glonass " signals of the frequency band L ₁ (F ₁ ) received by the antenna (not shown in FIG. 2) are applied to the input of the first band filter of the input device 1 to Frequency-filter the signal in the frequency band. In this case, the SRNS "GPS" signal has a frequency band with a bandwidth of ΔF = 8.184 MHz, and the SRNS "Glonass" signal has a frequency band with a bandwidth of ΔF = 10.838 MHz. The frequency bands of the SRNS "GPS" and "Glonass" signals do not cross each other. In this case, the position of the frequency band on the frequency axis by the SRNS "GPS" signal and the "Glonass" signal is shown in FIG. Here, the frequency band of the SRNS "GPS" signal is in the range of 1571.328 MHz to 1579.512 MHz, and the frequency band of the SRNS "Glonass" signal is in the range of 1599.956 MHz to 1610.794 MHz.

From the output of the filter 17, the SRNS " GPS " and " Glonass " signals are input via the amplifier 18 to the input of the filter 19. Here, the filter 19 is formed similarly to the filter 17 and has the same amplitude-frequency characteristic. The use of two band filters 17, 19 interconnected via an amplifier 18 can realize the required characteristics of the input device 91 for frequency selectivity and signal-to-noise ratio with one common band, such as 40 MHz.

From the output of the input device ₁ , the SRNS "GPS" signal and the "Glonass" signal of the frequency band L ₁ (F ₁ ) are input to the input of the input device 2 of the first signal frequency converter and the first amplifier 3 Amplified), frequency-converted in mixer 4 and amplified in second amplifier 5 (middle frequency amplifier).

In order to perform the first frequency conversion in the mixer 4 of the input device 2, the auxiliary of the generator 25 and the phase synchronizer 24 from a reference signal having a frequency of 15.36 MHz generated in the reference frequency generator 23. A 1413.12 MHz first heterodyne frequency signal synthesized in the furnace device 20 is used.

As a result of the first frequency conversion, the positions of the frequency bands occupied by the SRNS "GPS" signal and the "Glonass" signal on the frequency axis change as shown in FIG. Here, the frequency band of the SRNS "GPS" signal is in the range of 158.208 MHz to 166.392 MHz, and the band of the SRNS "Glonass" signal is in the range of 186.386 MHz to 197.674 MHz.

Select the first heterodyne frequency (f _a1 = 1413.12 MHz) so that the second heterodyne frequency (f _a2 = 1/3 x f _a1 = 176.64 MHz) associated with it is the upper boundary in the frequency band of the SRNS "GPS" converted signal. And the lower boundary in the frequency band of the SRNS " Glonass " converted signal (FIG. 4).

The SRNS " GPS " and " Glonass " signals output at the output of the amplifier 5 are converted at the device 2 and thus input to the first channel 6 and second channel 7 of the second signal frequency converter, i.e. It is input to the input of the filter (9) (11). These filters perform band filtering on signals corresponding to SRNS, respectively. That is, the filter 9 filters the SRNS "GPS" signal, and the filter 11 filters the SRNS "Glonass" signal. Filters 9 and 11 have bands of 8.2 MHz and 10.8 MHz and band frequencies of 162.3 MHz and 192.3 MHz, respectively.

The "GPS" and "Glonass" signals, separated from out-of-band interference with the aid of filters (9) (11) and divided into frequencies in each of channels (6), (7), respectively, to the signal inputs of mixers (10) (12) Is entered.

In order to perform a second frequency conversion in mixers 10 and 12 of channels 6 and 7, the receiving device of the present invention has a frequency of 8 from the first heterodyne frequency signal synthesized by the device 20. A second heterodyne frequency (f _a2 = 176.64 MHz) signal formed with the aid of the dividing device 21 is used.

As a result of the second frequency conversion, the positions of the frequency bands occupied by the SRNS "GPS" signal and the "Glonass" signal on the frequency axis change as shown in FIG. Here, FIG. 5A shows the frequency band (10.248 MHz to 18.432 MHz) of the SRNS "GPS" signal, and FIG. 5B shows the band (10.196 MHz to 21.034 MHz) of the SRNS "Glonass" signal.

In each of the channels 6 and 7 of the second frequency converter, the SRNS " GPS " and " Glonass " signals converted by the auxiliary of the mixers 10 and 12 are converted by the gain control amplifiers 13 and 15. After amplification, a three-level (two-bit) conversion is performed in the threshold device 14, 16, which is a two-bit level quantizer that provides the output signal required by the receiving device of the present invention.

In the receiving device of the present invention, digital control from a digital processing device or a digital navigation processor (not shown in FIG. 2) using the digital gain control of the amplifiers 13 and 15 with the aid of the DACs 26 and 27. Receive the signal. Gain control of the amplifiers 13 and 15 is necessary to maintain a predetermined level of the signal input to the threshold devices 14 and 16.

In the receiving device of the present invention, the threshold device 14 has a 2-bit level quantizer according to the DAC 28, 29 which receives a digital control signal from a digital processing device or a digital navigation processor (not shown in FIG. 2). Maintain a digital limit balance of (16). The thresholds of these threshold devices 14, 16 compensate for parameter dispersion and temperature variations of the passive and active elements.

The digital control signal is input to the DAC 26-29 from a digital processing device or digital navigation processor (not shown in FIG. 2) via a serial interface.

The output signal generated as described above is digitally processed by the navigation digital processor (not shown in FIG. 2) to obtain navigation information. This digital processing at an early stage divides the frequency f _a2 by 2 ^N (where N = 1,2,3) from the output signal of the device 21 from the signal of the second heterodyne frequency (f _a2 = 176.64 MHz). Quantizing (digitizing) the output signal of the channels 6 and 7 in time with the clock frequency f _T determined by the clock signal generated in the device 22. Here, if N is 3, the clock frequency is minimum and uses a value of f _T = 22.08 MHz.

In order to perform digitization without losing marine information in time, the converted SRNS "GPS" signal and the "Glonass" signal must be matched with each other. In other words, such that the ratio of the clock frequency f _T and the value of the conversion was SRNS "GPS" signals and "Glonass" signals of the frequency band value approximately 2 ^N (stage, N = 1,2,3).

In this regard, the receiving device of the present invention generates a signal of a heterodyne and clock frequency as follows: first heterodyne frequency f _a1 = 1413.12 MHz, second heterodyne frequency f _a2 = 176.64 MHz, and clock frequency f _T = f _a2 ; 2 ^N = 176.64; 2 ^N (where N = 1, 2, 3). In this case, the second heterodyne frequency signal and the clock signal are obtained by dividing the first heterodyne frequency signal by 8 and twice 2 ^N (where N = 1,2,3) through the apparatuses 21 and 22.

Accordingly, the receiving device of the present invention uses one common frequency synthesizer (apparatus 20) for generating signals of clock frequency and heterodyne frequency, i = 0 to i = 12 of frequency band L ₁ (F ₁ ). An SRNS "GPS" signal and a "Glonass" signal are simultaneously received and converted to have a literal frequency. In this case, the frequency of the generated clock signal matches the spectrum of the SRNS "GPS" and "Glonass" signals to be converted.

The structure of the proposed device is implemented using standard wireless electronic components produced industrially. This fact simplifies the implementation of the device through a series of production, and is widely used to determine the position according to the SRNS "GPS" and "Glonass" signals by mounting the receiver of the present invention on a portable receiver-indicator. It became usable.

From the results discussed above, the receiving device of the present invention is easy to use and industrially available, determines the above mentioned technical work, and mounts it on a portable receiver-indicator to simultaneously transmit SRNS "GPS" and "Glonass" signals. It is clear that it is possible to handle and precisely implement the navigation area position.

Evidence

1. "Built-in device of satellite radio navigation", I.V. Kudryavtesev, I.N. Mishchenko, A.I. Volynkin et al., Loscow., Transport, 1988.

2. "Network Satellite Wireless Navigation System", V.S. Shebashaevich, P.P. Dmitriev, N.V. Ivantsevich et al., Loscow, Radio I Svyaz, 1993.

3. "Global Positioning System (GPS) Receiver RF Flyer. Analog-to-Digital Converter", Rockwell International Proprietary Information Order Number, May 31, 1995.

4. Riley S., Howard N., Aardoom E., Daly P., Silverstrin P. "Combined GPS / GLONASS High Density Receivers for Spatial Applications," September 12-15, 1995, Palm Springs, California, USA GPS-95 Newsletter, pp. 835-844.

5. Moses I. "Conditions for the Navstar Global Positioning System Oscillator for GPS Manpacks," 30th Annual Frequency Control Symposium, 390-400.

6. "Wireless receiver", Bankov V.N. Banks A.f., Barulin L.G., Zhodzhinsky M.I. et al, loscow, Radio I Svyaz, 1984.

7. Professional Products IC Handbook, May 1991, GEC Plessey Semiconductors.

8. "Global Navigation Satellite System". The control document (3rd edition). The coordination scientific-information Center AEN II, Moscow, Russia, 1995.

Claims (4)

An apparatus for receiving a signal of a satellite radio navigation system, An input terminal is a signal input terminal of the apparatus and an output terminal is connected to a first signal frequency converter, and is configured by connecting a first amplifier, a mixer, and a second amplifier in series with the input terminal of the first signal frequency converter as an input terminal, and the first The output of the second amplifier of the signal frequency converter is connected to the first channel and the second channel of the second signal frequency converter, each channel consisting of a filter and a mixer, the input of which is an input of the corresponding channel of the second signal frequency converter. Input device; An apparatus for generating a signal of a first heterodyne frequency; And Consisting of a device for generating a clock frequency signal and a signal of a heterodyne frequency, The output end of the device for generating the first heterodyne frequency signal is connected to the reference input of the mixer of the device of the first signal frequency converter, and the output end of the second heterodyne frequency signal is connected to the first channel of the second signal frequency converter. Connected to the reference input of the mixer, The output of the channel of the second signal frequency converter and the clock signal output of the device generating the clock frequency signal and the heterodyne frequency signal are the outputs of the receiving device, A device for generating a first hetero frequency signal is provided in series and has first and second frequency dividers for dividing a frequency by 8 and 2 ^N (where N = 1,2,3), respectively. The output of the second frequency divider is the input of the second heterodyne frequency signal and the output of the clock frequency signal of the device for generating the clock and the heterodyne frequency signal, and the signal output of the second heterodyne frequency is the first signal of the second signal frequency converter. A signal receiver of a satellite radio navigation system, connected to a reference input of a mixer of two channels, and a mixer output of each channel of the second signal frequency converter connected to a channel output through a serially connected gain control amplifier and a threshold device. The device of claim 1, wherein the input device is configured such that a first band filter, an amplifier, and a second band filter are connected in series. The control input of the gain control amplifier and the control input of the two channel threshold devices of the second signal frequency converter are connected to the output of the corresponding digital-to-analog converter, and the input of the digital-to-analog converter is connected to the input of the device. Device that is a control input. 2. The apparatus of claim 1, wherein the two channel threshold devices of the second signal frequency converter are configured in the form of a level controlled two bit quantizer.