CN102096081A - Carrier wave and pseudo-random code stripping circuit - Google Patents
Carrier wave and pseudo-random code stripping circuit Download PDFInfo
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Abstract
The invention relates to a carrier wave and pseudo-random code stripping circuit for a satellite navigation signal receiving device, which comprises a carrier wave stripping circuit and a pseudo-random code stripping circuit, characterized in that the carrier wave stripping circuit comprises a decoding circuit; the intermediate-frequency signal I/Q (In-phase/Quadrature) circuit input from the radio frequency terminal and the signals output from a carrier wave NCO (Numerical Controlled Oscillator) enter the decoding circuit; and the decoding circuit outputs L bit I circuit mixing signals and L bit Q circuit mixing signals. After the circuit is adopted, the scheme adopts a decoder to substitute a mixing structure formed by a local carrier wave generating circuit and a fixed point multiplier, thus simplifying the structure of the circuit, optimizing the area of a chip and reducing power consumption. Because the decoder is constructed by adopting a gate circuit, the decoder can be directly mapped to a standard unit library, and a chip design tool can generate a high-quality territory. The carrier wave and pseudo-random code stripping circuit can be used for navigation satellite systems such as a GPS (Global Positioning System), a compass satellite navigation system, a GLONASS (Global Navigation Satellite System) or a Galileo satellite system and the like.
Description
Technical field
The present invention relates to a kind of carrier wave and pseudo-random code stripper circuit, in particular for the carrier wave and the pseudo-random code stripper circuit of satellite navigation signals receiving trap.
Background technology
In current satellite navigation system receiving trap design, in order to follow the tracks of the satellite-signal that is submerged among the noise, must at first input I/Q road intermediate-freuqncy signal be carried out the integration of certain time length, multiply each other and before carrying out integration, need at first intermediate-freuqncy signal to be carried out mixing, signal spectrum is moved base band from frequency band, and then producing with this locality that pseudo-random code is relevant separates spread spectrum to it, the result that will obtain sends into integration module at last.Owing to follow the tracks of in the chip design in common base band, chip all is designed to support a plurality of hardware corridors, can be simultaneously to different mode down or under the model identical multi-satellite signal follow the tracks of, so carrier wave and pseudo-random code strip module are also by structure in the hardware repeatedly.Therefore in order to save the chip total area, reduce power consumption, realize design more efficiently, be necessary existing design is improved.
In existing carrier wave and pseudo-random code strip module, at first with carrier wave NCO(numerical control vibration word) value generate SIN value (sine value) and the COS value (cosine value) that is used for the mixing of I/Q road respectively, with its multiplies each other corresponding with intermediate-freuqncy signal, multiplication operations is to finish by the multiplier of a fixed point then.Then enter into the pseudo-random code stripper circuit by the result after the above-mentioned optical mixing process, this operation is finished by the pseudo-random code correlator, just the result is delivered to the integration summation circuit at last.Each passage all needs a SIN value (sine value) and COS value (cosine value) to produce circuit in the current design, and the fixed-point multiplication device that at least one is used for mixing also needs a plurality of pseudo-random code correlators, therefore needs bigger hardware spending.Because module is just stable the operation up to closing this passage incessantly after following the tracks of beginning, bigger hardware spending also brings the lifting of power consumption.
Analyze a kind of existing carrier wave and pseudo-random code strip module design proposal below in conjunction with Fig. 1.Fig. 1 is a kind of carrier wave and pseudo-random code strip module design drawing.For the intermediate-freuqncy signal that can comprise navigation information is followed the tracks of, at first enter corresponding I, Q paths from the I/Q road intermediate-freuqncy signal 1 that radio-frequency head is come in, loop need duplicate one with phase place that receives intermediate-freuqncy signal carrier wave composition or the corresponding to local carrier of frequency, local carrier is by carrier wave NCO(numerical control vibration word) circuit 10 and cosine COS take place and circuit 12 takes place produce in the sinusoidal SIN of 11 controls.Local carrier and intermediate-freuqncy signal are carried out multiplicative mixing then, and the mixing of I/Q two-way is respectively to finish in the multiplier 2 of correspondence and multiplier 3.The output of mixing afterwards enters into code correlator, because tracking loop is divided into sign indicating number ring and carrier wave ring, and the sign indicating number ring uses the DLL(delay-locked loop circuit), and the carrier wave ring uses COSTAS(section Stas ring), so need three road sign indicating number interlock circuits, be respectively leading I/Q road 6 and leading I/Q road 9, current I/Q road 5 and current I/Q road 8 and hysteresis I/Q road 4 and hysteresis I/Q road 7, leading I/Q road 6 is used for the DLL(delay lock loop with leading I/Q road 9 and hysteresis I/Q road 4 with hysteresis I/Q road 7), and current I/Q road 5 is used for COSTAS(section Stas ring with current I/Q road 8).Here, the circuit that is used to produce three road C/A sign indicating numbers is a C/A code generator 13.The intermediate-freuqncy signal of peeling off carrier wave and pseudo-random code after this enters the integration module 14 of next stage, according to actual needs, need 6 road integrations soft/hard passage.Described the structure of integrating circuit in Fig. 2, integral process is: in totalizer 15, and input signal and last integral result addition; Addition result is saved in the register 16; Output integral result 17 after the elongate member when satisfying integration.
Summary of the invention
The purpose of this invention is to provide the carrier wave and the pseudo-random code stripper circuit that are used for the satellite navigation signals receiving trap.
The present invention is achieved in that a kind of carrier wave and pseudo-random code stripper circuit that is used for the satellite navigation signals receiving trap, described circuit comprises, carrier wave stripper circuit and pseudo-random code stripper circuit, described carrier wave stripper circuit comprises decoding scheme, enter described decoding scheme from the intermediate-freuqncy signal I/Q road and the carrier wave NCO output signal of radio-frequency head input, the I road mixed frequency signal of described decoding scheme output L bit and the Q road mixed frequency signal of L bit.
Further, described pseudo-random code stripper circuit comprises gating circuit and pseudorandom code generating circuit; Described gating circuit comprises three road I road alternative multi-selection devices and three road Q road alternative multi-selection devices; The I road mixed frequency signal of described decoding scheme output is according to keeping former phase place and negate phase place to be divided into the two-way circuit, and being connected to the alternative multi-selection device on three road I roads, described three tunnel alternative multi-selection device comprises leading road multi-selection device, current road multi-selection device and hysteresis road multi-selection device; The Q road mixed frequency signal of described decoding scheme output is according to keeping former phase place and negate phase place to be divided into the two-way circuit, and being connected to the alternative multi-selection device on three road Q roads, described three tunnel alternative multi-selection device comprises leading road multi-selection device, current road multi-selection device and hysteresis road multi-selection device; Described pseudorandom code generating circuit generates leading road pseudorandom chip, current road pseudorandom chip and hysteresis road pseudorandom chip, and described chip is respectively the gating switch of leading road multi-selection device, current road multi-selection device and the hysteresis road multi-selection device on described I, Q road.
Further, described pseudo-random code stripper circuit comprises the pseudorandom code generating circuit, described pseudorandom code generating circuit generates leading road pseudorandom chip, current road pseudorandom chip and hysteresis road pseudorandom chip totally three tunnel pseudorandom chips, and described three tunnel pseudorandom chips multiply each other with the I road mixed frequency signal of described decoding scheme output L bit and the Q road mixed frequency signal of L bit respectively.
Further, described pseudorandom code generating circuit is the C/A code generating circuit.
The present invention also provides a kind of carrier wave and pseudo-random code stripper circuit that is used for the satellite navigation signals receiving trap, described circuit comprises, carrier wave stripper circuit and pseudo-random code stripper circuit, described pseudo-random code stripper circuit comprises gating circuit and pseudorandom code generating circuit; Described gating circuit comprises three road I road alternative multi-selection devices and three road Q road alternative multi-selection devices; The I road mixed frequency signal of described carrier wave stripper circuit output is according to keeping former phase place and negate phase place to be divided into the two-way circuit, and being connected to the alternative multi-selection device on three road I roads, described three tunnel alternative multi-selection device comprises leading road multi-selection device, current road multi-selection device and hysteresis road multi-selection device; The Q road mixed frequency signal of described carrier wave stripper circuit output is according to keeping former phase place and negate phase place to be divided into the two-way circuit, and being connected to the alternative multi-selection device on three road Q roads, described three tunnel alternative multi-selection device comprises leading road multi-selection device, current road multi-selection device and hysteresis road multi-selection device; Described pseudorandom code generating circuit generates leading road pseudorandom chip, current road pseudorandom chip and hysteresis road pseudorandom chip, and described chip is respectively the gating switch of leading road multi-selection device, current road multi-selection device and the hysteresis road multi-selection device on described I, Q road.
Further, described carrier wave stripper circuit comprises carrier wave NCO, described carrier wave NCO control is sinusoidal circuit to take place and cosine generation circuit produces local carrier, and described local carrier and I/Q intermediate-freuqncy signal finish in multiplier that output I road mixed frequency signal and Q road mixed frequency signal arrive described pseudo-random code stripper circuit after the mixing.
Further, described pseudorandom code generating circuit is the C/A code generating circuit.
After adopting this circuit, the mixing structure that this programme adopts code translator to replace local carrier generation circuit and fixed-point multiplication device to form has been simplified circuit structure, optimizes chip area, has reduced power consumption; Because code translator adopts gate circuit to build, and can map directly in the standard cell lib, be convenient to the chip design instrument and generate the high-quality domain.The present invention can be used for navigational satellite systems such as GPS, Beidou satellite navigation system, GLONASS or Galileo.
Description of drawings
Fig. 1 is carrier wave and the pseudo-random code strip module design drawing of a kind of GPS;
Fig. 2 is the integration module design drawing that is used for Fig. 1;
Fig. 3 is for realizing complete skill option A of the present invention;
Fig. 4 is for realizing complete skill option b of the present invention;
Fig. 5 is for realizing complete skill scheme C of the present invention;
Fig. 6 is for realizing complete skill scheme D of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Illustrate below in conjunction with Fig. 3 and provided by the inventionly to finish carrier wave and pseudo-random code is peeled off functional integrity technical scheme A.
1, the intermediate-freuqncy signal I/Q road 18 from the radio-frequency head input enters into decoding scheme 20.Decoding scheme is at first with the Q road intermediate-freuqncy signal of the I road intermediate-freuqncy signal of N bit, N bit and the carrier wave NCO(numerical control vibration word of M bit) input word of 19 synthetic N+N+M bits, through behind the code translator of building with gate circuit, export the I road mixing results of L bit and the Q road mixing results of L bit at last.Move base band through the intermediate-freuqncy signal of navigating after the mixing by frequency band, the carrier wave composition is stripped from, the only remaining navigation bit information that has pseudo-random code and the phase frequency control information of intermediate-freuqncy signal and local carrier of comprising.
2, the I road mixing results from code translator output is output as two-way according to former phase place 22 of maintenance and negate phase place 21, be connected to three tunnel alternative multi-selection device then, three road multi-selection devices are respectively leading road multi-selection device 26, current road multi-selection device 27 and hysteresis road multi-selection device 28.Here be to use the pseudo-random code chip to have only 1 bit, have only the characteristics design of two kinds of situations to form with its correlated results.Q road principle is relevant fully with the I road, and the pseudo-random code gating signal that is used is also just the same with corresponding I road.The gating signal that is used for the alternative multi-selection device is that C/A sign indicating number (thick catch code) generator 25 is synthetic.
Illustrate below in conjunction with Fig. 4 and provided by the inventionly to finish carrier wave and pseudo-random code is peeled off functional integrity technical scheme B.
1, finish the mixing on I road and Q road from the two-way I/Q road intermediate-freuqncy signal that radio-frequency head 40 comes out respectively at I road frequency mixer 41 and Q road frequency mixer 42, frequency mixer is the fixed-point multiplication device.Then take place with the local carrier signal of intermediate-freuqncy signal multiplicative mixing by forcing function generator 43 and cosine generator 45.Forcing function generator 43 is by carrier wave NCO(numerical control vibration word with 45 of cosine generators) 44 control generations.
2, I/Q road mixing results then enters a yard interlock circuit, and the sign indicating number interlock circuit is made of leading road, current road, hysteresis Lu Sanlu correlator, and each road correlator is divided into the I/Q road.Leading I road, road correlator 49 and Q road correlator 46 and I road, hysteresis road correlator 51 and Q correlator 48 are used for the DLL(delay lock loop).Correlator I road, current road correlator 50 and 47 of Q road correlators are used for the PLL(phaselocked loop) and the PLL(FLL).The local code C/A sign indicating number that is used to be correlated with (thick catch code) generator 25 is synthetic.
Illustrate below in conjunction with Fig. 5 and provided by the inventionly to finish carrier wave and pseudo-random code is peeled off functional integrity technical scheme C.
1, finish the mixing on I road and Q road from the two-way I/Q road intermediate-freuqncy signal that radio-frequency head 60 comes out respectively at I road frequency mixer 61 and Q road frequency mixer 62, frequency mixer is the fixed-point multiplication device.Then take place with the local carrier signal of intermediate-freuqncy signal multiplicative mixing by forcing function generator 79 and cosine generator 80.Forcing function generator 79 is by carrier wave NCO(numerical control vibration word with 80 of cosine generators) 81 control generations.
2, Shu Chu I road mixing results is according to keeping former phase place 63 and negate phase place 64 to be output as two-way, be connected to three tunnel alternative multi-selection device then, three road multi-selection devices are respectively leading road multi-selection device 67, current road multi-selection device 68 and hysteresis road multi-selection device 69.Here be to use the pseudo-random code chip to have only 1 bit, have only the characteristics design of two kinds of situations to form with its correlated results.Q road principle is relevant fully with the I road, and the pseudo-random code gating signal that is used is also just the same with corresponding I road.The gating signal that is used for the alternative multi-selection device is synthetic by C/A sign indicating number (thick catch code) generator.
Illustrate below in conjunction with Fig. 6 and provided by the inventionly to finish carrier wave and pseudo-random code is peeled off functional integrity technical scheme D.
1, the intermediate-freuqncy signal I/Q road 90 from the radio-frequency head input enters into decoding scheme 91.Decoding scheme is at first with the Q road intermediate-freuqncy signal of the I road intermediate-freuqncy signal of N bit, N bit and the carrier wave NCO(numerical control vibration word of M bit) input word of 92 synthetic N+N+M bits, through behind the code translator of building with gate circuit, export the I road mixing results of L bit and the Q road mixing results of L bit at last.Move base band through the intermediate-freuqncy signal of navigating after the mixing by frequency band, the carrier wave composition is stripped from, the only remaining navigation bit information that has pseudo-random code and the phase frequency control information of intermediate-freuqncy signal and local carrier of comprising.
2, I/Q road mixing results then enters a yard interlock circuit, and the sign indicating number interlock circuit is made of leading road, current road, hysteresis Lu Sanlu correlator, and each road correlator is divided into the I/Q road.Leading I road, road correlator 93 and Q road correlator 96 and I road, hysteresis road correlator 95 and Q correlator 98 are used for the DLL(delay lock loop).Correlator I road, current road correlator 94 and 97 of Q road correlators are used for the PLL(phaselocked loop) and the PLL(FLL).The local code C/A sign indicating number that is used to be correlated with (thick catch code) generator is synthetic.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a carrier wave and pseudo-random code stripper circuit that is used for the satellite navigation signals receiving trap, described circuit comprises, carrier wave stripper circuit and pseudo-random code stripper circuit, it is characterized in that, described carrier wave stripper circuit comprises decoding scheme, enter described decoding scheme from the intermediate-freuqncy signal I/Q road and the carrier wave NCO output signal of radio-frequency head input, the I road mixed frequency signal of described decoding scheme output L bit and the Q road mixed frequency signal of L bit.
2. carrier wave as claimed in claim 1 and pseudo-random code stripper circuit is characterized in that, described pseudo-random code stripper circuit comprises gating circuit and pseudorandom code generating circuit; Described gating circuit comprises three road I road alternative multi-selection devices and three road Q road alternative multi-selection devices; The I road mixed frequency signal of described decoding scheme output is according to keeping former phase place and negate phase place to be divided into the two-way circuit, and being connected to the alternative multi-selection device on three road I roads, described three tunnel alternative multi-selection device comprises leading road multi-selection device, current road multi-selection device and hysteresis road multi-selection device; The Q road mixed frequency signal of described decoding scheme output is according to keeping former phase place and negate phase place to be divided into the two-way circuit, and being connected to the alternative multi-selection device on three road Q roads, described three tunnel alternative multi-selection device comprises leading road multi-selection device, current road multi-selection device and hysteresis road multi-selection device; Described pseudorandom code generating circuit generates leading road pseudorandom chip, current road pseudorandom chip and hysteresis road pseudorandom chip, and described chip is respectively the gating switch of leading road multi-selection device, current road multi-selection device and the hysteresis road multi-selection device on described I, Q road.
3. carrier wave as claimed in claim 1 and pseudo-random code stripper circuit, it is characterized in that, described pseudo-random code stripper circuit comprises the pseudorandom code generating circuit, described pseudorandom code generating circuit generates leading road pseudorandom chip, current road pseudorandom chip and hysteresis road pseudorandom chip totally three tunnel pseudorandom chips, and described three tunnel pseudorandom chips multiply each other with the I road mixed frequency signal of described decoding scheme output L bit and the Q road mixed frequency signal of L bit respectively.
4. as any described carrier wave and pseudo-random code stripper circuit in the claim 1 to 3, it is characterized in that described pseudorandom code generating circuit is the C/A code generating circuit.
5. a carrier wave and pseudo-random code stripper circuit that is used for the satellite navigation signals receiving trap, described circuit comprises, carrier wave stripper circuit and pseudo-random code stripper circuit is characterized in that, described pseudo-random code stripper circuit comprises gating circuit and pseudorandom code generating circuit; Described gating circuit comprises three road I road alternative multi-selection devices and three road Q road alternative multi-selection devices; The I road mixed frequency signal of described carrier wave stripper circuit output is according to keeping former phase place and negate phase place to be divided into the two-way circuit, and being connected to the alternative multi-selection device on three road I roads, described three tunnel alternative multi-selection device comprises leading road multi-selection device, current road multi-selection device and hysteresis road multi-selection device; The Q road mixed frequency signal of described carrier wave stripper circuit output is according to keeping former phase place and negate phase place to be divided into the two-way circuit, and being connected to the alternative multi-selection device on three road Q roads, described three tunnel alternative multi-selection device comprises leading road multi-selection device, current road multi-selection device and hysteresis road multi-selection device; Described pseudorandom code generating circuit generates leading road pseudorandom chip, current road pseudorandom chip and hysteresis road pseudorandom chip, and described chip is respectively the gating switch of leading road multi-selection device, current road multi-selection device and the hysteresis road multi-selection device on described I, Q road.
6. carrier wave as claimed in claim 5 and pseudo-random code stripper circuit, it is characterized in that, described carrier wave stripper circuit comprises carrier wave NCO, described carrier wave NCO control is sinusoidal circuit to take place and cosine generation circuit produces local carrier, and described local carrier and I/Q intermediate-freuqncy signal finish in multiplier that output I road mixed frequency signal and Q road mixed frequency signal arrive described pseudo-random code stripper circuit after the mixing.
7. as any described carrier wave and pseudo-random code stripper circuit in the claim 5 to 6, it is characterized in that described pseudorandom code generating circuit is the C/A code generating circuit.
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Cited By (1)
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Address after: 510530 Room 301 and 401, Building 42, Dongzhong Road, East District, Guangzhou Economic and Technological Development Zone, Guangdong Province Patentee after: TECHTOTOP MICROELECTRONICS Co.,Ltd. Address before: 510663 Guangzhou science and Technology Development Zone, Guangdong, Cai Cai Cai road, room A701, No. 11 Patentee before: TECHTOTOP MICROELECTRONICS Co.,Ltd. |
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Denomination of invention: A carrier and pseudorandom code stripping circuit Effective date of registration: 20220630 Granted publication date: 20121003 Pledgee: Societe Generale Bank Limited by Share Ltd. Guangzhou branch Pledgor: TECHTOTOP MICROELECTRONICS Co.,Ltd. Registration number: Y2022980009607 |
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Granted publication date: 20121003 Pledgee: Societe Generale Bank Limited by Share Ltd. Guangzhou branch Pledgor: TECHTOTOP MICROELECTRONICS Co.,Ltd. Registration number: Y2022980009607 |
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