CN111399008B - Multi-mode multi-channel navigation receiving device - Google Patents
Multi-mode multi-channel navigation receiving device Download PDFInfo
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- CN111399008B CN111399008B CN202010264333.0A CN202010264333A CN111399008B CN 111399008 B CN111399008 B CN 111399008B CN 202010264333 A CN202010264333 A CN 202010264333A CN 111399008 B CN111399008 B CN 111399008B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/33—Multimode operation in different systems which transmit time stamped messages, e.g. GPS/GLONASS
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/32—Multimode operation in a single same satellite system, e.g. GPS L1/L2
Abstract
The invention discloses a multimode multichannel navigation receiving device, and belongs to the field of navigation. The scheme is provided aiming at the problems of narrow frequency band, poor phase consistency and low isolation degree in the prior art when the navigation signal is received. The phase locked loop comprises a first phase locked loop and a second phase locked loop, wherein the first phase locked loop outputs two paths of orthogonal local oscillator signals, and the second phase locked loop outputs the other two paths of orthogonal local oscillator signals; the two local oscillator signals of the first phase-locked loop are respectively input into one of the receiving channels corresponding to the antennas, and the two local oscillator signals of the second phase-locked loop are respectively input into the other receiving channel corresponding to the antennas. By skillfully setting the connection relation between the phase-locked loop and each receiving channel, each antenna can use different local oscillation signals through two independent receiving channels, and the local oscillation signals in the same receiving channel are derived from the same phase-locked loop. The advantages of large receiving frequency band span, stable phase consistency and low crosstalk between receiving channels are realized.
Description
Technical Field
The invention relates to the field of navigation, in particular to a multimode multichannel navigation receiving device.
Background
With the construction and continuous improvement of Global Navigation Satellite Systems (GNSS) such as GPS (Global Positioning System) in the united states, GLONASS (GLONASS) in russia, Galileo (Galileo) in europe, beidou in china and the like, and the higher and higher accuracy of navigation and Positioning, centimeter-level accuracy has been achieved at present. By virtue of a high precision navigation system, receivers can accurately determine the relative position between antennas mounted on a carrier or platform, so that their direction can be determined in real time, and even their attitude can be tested, such applications may be collectively referred to as "attitude and heading". The attitude and direction measurement usually requires a navigation receiver to have high positioning accuracy, and receiving channels of different antennas receiving the same signal have high consistency and good isolation.
In order to improve the positioning accuracy, a receiver is generally required to be capable of simultaneously receiving signals of a global navigation satellite system with multiple frequencies such as GPS, GLONASS, Galileo, beidou and the like, and since the navigation receiving frequency points are distributed between 1.15 GHz-1.3 GHz and 1.55 GHz-1.65 GHz, a single-channel receiver cannot meet the requirement, and the receiver corresponding to each antenna is generally required to have at least 2 channels.
At present, the main modes and frequency point tables of global satellite navigation are as follows:
the signal receiving channels of different antennas are consistent, the gain and the phase of the channels are required to be consistent, in order to ensure the high consistency of the phases among the channels, the mixers of the receiving channels are required to use the same local oscillation signal to ensure the consistency of the frequency and the phase, and the same sampling clock is adopted to ensure the consistency of the output time sequence of the digital-to-analog converter ADC. However, in the conventional multi-channel receiver, independent local oscillators are adopted in different receiving channels, so that the consistency of local oscillation frequency and phase of the channels is difficult to ensure; or the same local oscillator is adopted by a plurality of receiving channels, so that different receiving channels can only receive signals near the same local oscillator, and the simultaneous reception of the navigation signals of the two frequency bands of 1.15 GHz-1.3 GHz and 1.55 GHz-1.65 GHz is difficult to realize by using a single chip. In addition, if the same local oscillator is simply used for two adjacent receiving channels, it is difficult to satisfy the requirement of high isolation because the two channels using the same local oscillator are close to each other.
Disclosure of Invention
In order to solve the problems in the prior art, an object of the present invention is to provide a multi-mode multi-channel navigation receiving apparatus, wherein different receiving channels for receiving the same signal have good isolation, support multi-antenna navigation signal reception, and have simple and convenient external antenna connection, and are particularly suitable for attitude measurement and direction finding of multi-mode navigation.
The invention relates to a multimode multichannel navigation receiving device, which comprises more than two antennae, wherein the signal of each antenna is respectively input into two independent receiving channels for signal processing, each receiving channel is respectively provided with a corresponding signal output end, and each receiving channel is connected with the same sampling clock; the phase locked loop is used for outputting two paths of orthogonal local oscillator signals, and the second phase locked loop is used for outputting the other two paths of orthogonal local oscillator signals; the two local oscillator signals of the first phase-locked loop are respectively input into one of the receiving channels corresponding to the antennas, and the two local oscillator signals of the second phase-locked loop are respectively input into the other receiving channel corresponding to the antennas.
The multimode multichannel navigation receiving device has the advantages that the connection relation between the phase-locked loop and each receiving channel is ingeniously set, so that each line can use different local oscillation signals through two independent receiving channels, and the local oscillation signals in the same receiving channel come from the same phase-locked loop. The advantages of large receiving frequency band span, stable phase consistency and low crosstalk between receiving channels are realized.
The first phase-locked loop, the second phase-locked loop and all receiving channels are integrated in the same chip. The technical scheme that the integration level is higher than that of the prior art can be realized, data operation is completed in one chip, and the navigation cost and volume are effectively reduced.
And the receiving channels connected into the first phase-locked loop and the receiving channels connected into the second phase-locked loop are distributed at intervals in the chip. The receiving channels using the same phase-locked loop local oscillator further realize isolation on the physical layer, and the isolation degree is greatly improved.
All receiving channels have the same structure and comprise a low noise amplifier, an I-path mixer, a Q-path mixer, a filter, a programmable frequency divider and an analog-to-digital converter; the antenna signal is divided into two paths after passing through the low noise amplifier, one path of the antenna signal is input into a first input end of a filter through an I path of frequency mixer, the other path of the antenna signal is input into a second input end of the filter through a Q path of frequency mixer, and the output end of the filter is sequentially connected with a programmable frequency divider and an analog-to-digital converter and then output; the I-path frequency mixer and the Q-path frequency mixer are respectively connected to two paths of orthogonal local oscillator signals in the same phase-locked loop. The aim is to provide an implementation mode of a receiving channel.
And the frequency of the local oscillation signal output by the first phase-locked loop is 1.15 GHz-1.30 GHz. The local oscillation range is suitable for being used in a 1.15 GHz-1.30 GHz navigation frequency band.
The frequency of the local oscillator signal output by the first phase-locked loop is 1222 MHz. The object is to provide the most preferred output frequency point of the first phase locked loop.
And the frequency of the local oscillation signal output by the second phase-locked loop is 1.55 GHz-1.65 GHz. The local oscillation range is suitable for being used in the 1.55 GHz-1.65 GHz navigation frequency band.
And the frequency of the local oscillator signal output by the second phase-locked loop is 1582 MHz. The object is to provide the most preferred output frequency point of the second phase locked loop.
Drawings
FIG. 1 is a schematic structural diagram of a first embodiment of a multimode, multichannel navigation receiver according to the present invention;
FIG. 2 is a schematic structural diagram of a second embodiment of the multimode, multichannel navigation receiver of the present invention.
Reference numerals:
ANT 1-ANTn: first to nth antennas;
RX1 to RX2 n: first to 2 n-th receive channels, RFIN _ RX 1-RFIN _ RX2 n: RF input terminal of first receiving channel to RF input terminal of 2n receiving channel, OUT _ RX1 OUT _ RX2 n: the signal output end of the first receiving channel to the signal output end of the 2n receiving channel;
LNA-low noise amplifier, Mixer _ I-I way Mixer, Mixer _ Q-Q way Mixer, Filter-Filter, PGA-programmable frequency divider, ADC-analog-to-digital converter;
u1-chip;
PLL 1-first phase locked loop, Flo1_ I-I local oscillation signal of first phase locked loop, Flo1_ Q-Q local oscillation signal of first phase locked loop; PLL 2-second phase-locked loop, Flo2_ I-I local oscillation signal of second phase-locked loop, Flo2_ Q-Q local oscillation signal of second phase-locked loop; a/2-divide-by-2 frequency divider;
CLKGEN-clock generator, Fs-sampling clock.
Detailed Description
Example one
The multimode multichannel navigation receiver device of the present invention is illustrated by taking a conventional two-antenna four-receiving-channel structure as an example, as shown in fig. 1. Mainly comprises two antennas integrated in the same chip U1: a first antenna ANT1 and a second antenna ANT 2; four receiving channels: a first RX1, a second RX2, a third RX3 and a fourth RX 4; two phase-locked loops: a first phase-locked loop PLL1 and a second phase-locked loop PLL 2. And includes a clock generator CLKGEN. In order to improve the isolation to the maximum extent on the physical level, when the chip is integrated, the first receiving channel RX1, the second receiving channel RX2, the third receiving channel RX3 and the fourth receiving channel RX4 are arranged in parallel in sequence. The first antenna and the second antenna do not overlap in physical location.
The chip U1 is at least provided with four signal input ends and four signal output ends, namely RFIN _ RX 1-RFIN _ RX 4: an RF input of the first receive channel to an RF input of the fourth receive channel; OUT _ RX1 OUT _ RX 4: a signal output terminal of the first receive path to a signal output terminal of the fourth receive path.
The structure of the four receiving channels is the same, and each channel mainly comprises a low noise amplifier LNA, an I-channel Mixer _ I, Q-channel Mixer _ Q, a Filter Filter, a programmable frequency divider PGA and an analog-to-digital converter ADC. The antenna signal is divided into two paths after passing through the low noise amplifier, one path of the antenna signal is input into a first input end of the filter through the I path of frequency mixer, the other path of the antenna signal is input into a second input end of the filter through the Q path of frequency mixer, and the output end of the filter is sequentially connected with the programmable frequency divider and the analog-to-digital converter and then output.
The two phase-locked loops respectively comprise a divide-by-2 frequency divider and respectively output two orthogonal local oscillation signals. The method specifically comprises the following steps: the first phase-locked loop PLL1 outputs an I-path local oscillation signal Flo1_ I and a Q-path local oscillation signal Flo1_ Q with the same frequency and the phase difference pi/2; the second phase-locked loop PLL2 outputs I-path local oscillation signal Flo2_ I and Q-path local oscillation signal Flo2_ Q with same frequency and phase difference pi/2. The first phase-locked loop can output local oscillation signals with the frequency range of 1.15 GHz-1.30 GHz, and the second phase-locked loop can output local oscillation signals with the frequency range of 1.55 GHz-1.65 GHz.
The first antenna is divided into two paths of radio frequency signals, one path of radio frequency signals is connected with the first receiving channel, and the other path of radio frequency signals is connected with the second receiving channel. The second antenna is also divided into two paths of radio frequency signals, one path is connected with the third receiving channel, and the other path is connected with the fourth receiving channel. The I-path frequency mixer of the first receiving channel is connected with the I-path local oscillation signal Flo1_ I of the first phase-locked loop, and the Q-path frequency mixer is connected with the Q-path local oscillation signal Flo1_ Q of the first phase-locked loop. The I-path frequency mixer of the second receiving channel is connected with an I-path local oscillation signal Flo2_ I of the second phase-locked loop, and the Q-path frequency mixer is connected with a Q-path local oscillation signal Flo2_ Q of the second phase-locked loop. The I-path frequency mixer of the third receiving channel is connected with the I-path local oscillation signal Flo1_ I of the first phase-locked loop, and the Q-path frequency mixer is connected with the Q-path local oscillation signal Flo1_ Q of the first phase-locked loop. The I-path frequency mixer of the fourth receiving channel is connected with the I-path local oscillation signal Flo2_ I of the second phase-locked loop, and the Q-path frequency mixer is connected with the Q-path local oscillation signal Flo2_ Q of the second phase-locked loop. Then the analog-to-digital converters of the four receiving channels are respectively connected with the same sampling clock Fs.
The sampling clock Fs is generated by a clock generator CLKGEN.
The working principle and the working process of the embodiment are as follows:
each antenna can receive navigation signals of frequency bands of 1.15 GHz-1.30 GHz and 1.55 GHz-1.65 GHz. And when the output local oscillation frequency of the first phase-locked loop corresponding to the first receiving channel and the third receiving channel is 1222MHz, the navigation signals of 1.15 GHz-1.30 GHz bands received by the two antennas are respectively processed. Similarly, when the output local oscillation frequency of the second phase-locked loop corresponding to the second receiving channel and the second phase-locked loop corresponding to the fourth receiving channel is 1582MHz, the navigation signals of the frequency bands of 1.55GHz to 1.65GHz received by the two antennas are respectively processed. The 1222MHz and 1582MHz are only preferred frequency points, and are not limited by the implementation manner.
The following table shows the receiving configuration for the prior art global satellite navigation signals:
the antenna receives radio frequency navigation signals, the radio frequency navigation signals are converted into intermediate frequency signals after frequency mixing, and the intermediate frequency signals are filtered out of band interference signals and noise through a filter. And finally, the analog-to-digital converter converts the analog intermediate frequency signal into a digital intermediate frequency signal and outputs the digital intermediate frequency signal to a receiving baseband outside a chip for processing.
According to a preferred configuration, the intermediate frequency of the first and third receive channels is between-55.78 MHz and +56.75MHz, and the intermediate frequency of the second and fourth receive channels is between-22.948 MHz and-24.15 MHz. Accordingly, the first and third receiving channels can process signal bandwidth larger than 56.75MHz, and the second and fourth receiving channels can process signal bandwidth larger than 24.15 MHz.
In the attitude and direction measurement, the positions of different antennas of the test equipment are accurately positioned through satellite signals, so that the direction or the attitude of the test equipment is calculated, and the signal processing process among different antennas has to have good consistency and independence. In the invention, the first antenna and the second antenna are positioned at different positions, but the same navigation frequency points are received by the first antenna and the second antenna. The gain configuration, the local oscillator signal and the ADC sampling clock fs of the first and third receive channels are also identical. In addition to the uniformity of the integrated circuit processes implemented on a single chip, the first and third receive channels can possess very high uniformity. In addition, in the physical realization of the first receiving channel and the third receiving channel, the channel layouts are not close to each other, but the second receiving channel is arranged between the first receiving channel and the third receiving channel, so that the isolation effect of the first receiving channel and the third receiving channel is improved, and the influence on the resolving precision of two different antenna positions due to mutual interference of signals from different antennas in the processing process is avoided. Similarly, the co-local oscillation scheme of the second and fourth receiving channels has the same principle as the co-local oscillation scheme of the first and third receiving channels.
The common local oscillator scheme has the advantages that the consistency between the channels is high, the isolation effect is good, the connection between the antenna and the receiving channel is very simple, the cross is avoided, the mutual interference of different antenna signals can be blocked, and the isolation between the antennas is further improved.
Example two
The multimode multichannel navigation receiving device provided by the invention has good expansibility besides the conventional scheme described in the first embodiment, as shown in fig. 2. When more than two antennas need to be configured, the principle is the same as that of the first embodiment, and the structural difference mainly lies in that the number of the antennas and the number of the receiving channels are changed, but each antenna still corresponds to two independent receiving channels. That is, when there are n antennas, 2n reception channels are arranged. And the two receiving channels corresponding to the same antenna are respectively connected with the first phase-locked loop and the second phase-locked loop. And in the physical layer, the receiving channels of the same phase-locked loop are connected, and the receiving channels corresponding to the other phase-locked loop are alternately arranged.
In this embodiment, the specific structure and operation principle of any receiving channel, phase-locked loop and clock generator are the same as those in the first embodiment.
It will be apparent to those skilled in the art that various other changes and modifications may be made in the above-described embodiments and concepts and all such changes and modifications are intended to be within the scope of the appended claims.
Claims (6)
1. A multimode multi-channel navigation receiving device comprises more than two antennas, wherein signals of each antenna are respectively input into two independent receiving channels for signal processing, each receiving channel is provided with a corresponding signal output end, and each receiving channel is connected with the same sampling clock; the phase locked loop is characterized by further comprising a first phase locked loop and a second phase locked loop, wherein the first phase locked loop outputs two paths of orthogonal local oscillator signals, and the second phase locked loop outputs the other two paths of orthogonal local oscillator signals; two local oscillation signals of the first phase-locked loop are respectively input into one receiving channel corresponding to each antenna, and two local oscillation signals of the second phase-locked loop are respectively input into the other receiving channel corresponding to each antenna; the first phase-locked loop, the second phase-locked loop and all receiving channels are integrated in the same chip; a receiving channel accessed to the first phase-locked loop and a receiving channel accessed to the second phase-locked loop are distributed at intervals in the chip;
the antennas are in different positions, but receive the same navigation frequency point.
2. The multimode multichannel navigation receiver device as recited in claim 1, wherein all receiving channels have the same structure and comprise a low noise amplifier, an I-path mixer, a Q-path mixer, a filter, a programmable frequency divider and an analog-to-digital converter; the antenna signal is divided into two paths after passing through the low noise amplifier, one path of the antenna signal is input into a first input end of a filter through an I path of frequency mixer, the other path of the antenna signal is input into a second input end of the filter through a Q path of frequency mixer, and the output end of the filter is sequentially connected with a programmable frequency divider and an analog-to-digital converter and then output; the I-path frequency mixer and the Q-path frequency mixer are respectively connected to two paths of orthogonal local oscillator signals in the same phase-locked loop.
3. The multimode multichannel navigation receiver device as recited in claim 1, wherein the local oscillator signal output by the first phase-locked loop has a frequency of 1.15 GHz-1.3 GHz.
4. The multimode, multichannel navigation receiver of claim 3, wherein the local oscillator signal output by the first phase locked loop has a frequency of 1222 MHz.
5. The multimode multichannel navigation receiver device as recited in claim 1, wherein the local oscillator signal output by the second phase-locked loop has a frequency of 1.55 GHz-1.65 GHz.
6. The multimode multichannel navigation receiver device as recited in claim 5, wherein the local oscillator signal output by the second phase-locked loop has a frequency of 1582 MHz.
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