CN103873087A - Zero-intermediate-frequency spread spectrum receiver - Google Patents
Zero-intermediate-frequency spread spectrum receiver Download PDFInfo
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- CN103873087A CN103873087A CN201210525354.9A CN201210525354A CN103873087A CN 103873087 A CN103873087 A CN 103873087A CN 201210525354 A CN201210525354 A CN 201210525354A CN 103873087 A CN103873087 A CN 103873087A
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Abstract
A zero-intermediate-frequency spread spectrum receiver design mainly comprises a frequency mixer (multiplier), a pseudo code correlator, an integral cleaner, a digital loop filter, a code phase counter, a carrier complete-cycle phase counter, a code delay control circuit, a code DCO, a phase control logic, a carrier DCO and a read-write control logic. When the receiver receives a spread spectrum signal, spectrum spreading of a code sequence to sent information data is released (referred to as de-spreading) first to obtain a carrier signal of information data modulation, and then carrier demodulation is carried out to obtain sent information. In order to de-spread a received signal, a local pseudo code sequence generated by the receiver and a received pseudo code sequence must be completely aligned. Therefore, a receiver of a spread spectrum communication system is mainly composed of three parts: (1) spread spectrum code capture; (2) spread spectrum code synchronous tracking; and (3) carrier demodulation, and the three parts are completed through cooperative work of a hardware circuit and a software algorithm.
Description
Technical field
The present invention is a kind of zero intermediate frequency band spread receiver design, is exactly the zero intermediate frequency band spread receiver that is applied to complex navigation navigation system specifically.
Background technology
First be that modern naval warfare is to carry out in the situation that one " is not met " between ourselves and the enemy, the big-and-middle-sized surface vessel of naval, must there be the guarantee of location conduct reliably continuously in the troops such as submarine in effective scope of activities, next is because combat vessel will have very strong maneuverability, to require and constantly formulation and amendment course line of sea area situation according to combat duty, so at process narrow fairway, shoal submerged reef, when in the complicated marine site such as underwater obstacle, the navigator fix on naval vessel must be very accurate, particularly under high-tech war condition, enemy and we's situation is fast changing, ship manoeuvre also will be strengthened, this accuracy to navigator fix, reliability has proposed requirements at the higher level.Be again in mine warfare, minelayer, constructing various thunder battle arrays (offensive thunder battle array, basic thunder battle array, defence Lei Zhen etc.) and minesweeper in the time removing submarine mine, all needs high-precision positioning means.
Summary of the invention
The object of this invention is to provide a kind of zero intermediate frequency band spread receiver design.
The object of the present invention is achieved like this:
It mainly comprises frequency mixer (multiplier), pseudo code correlation device, integration washer, digital loop filters, code phase counter, carrier wave complete cycle phase counter, code delay control circuit, code DCO, phase control logic, carrier wave DCO and read-write control logic.
Its operation principle is such:
After receiver receives spread-spectrum signal, be first to remove coded sequence to sending the spread spectrum (abbreviation despreading) of information data, the carrier signal of acquired information Data Modulation, remakes carrier wave demodulation, thereby obtains the information sending.
Its course of action is such:
Receiver receives after the next spread-spectrum signal of transmitting, gives three circuit: frequency expansion sequence synchronization acquiring circuit, frequency expansion sequence synchronous follow-up circuit and carrier synchronization tracking and data demodulation circuit after premenstrual storing is large.Signal, first by synchronization acquiring circuit, makes the phase place of receiver adjustment and selection local coder sequence, produces the local spreading code consistent with the sequence phase of making a start, and completes the initial synchronisation of coded sequence.Although now local spreading code is consistent with the coded sequence phase place of reception, but accurate consistent degree is to each other also not high, synchronous follow-up circuit need to be entered so that local pseudo-code is in full accord with the phase place of received code, and establish the tracking of local spreading code to received code sequence phase, enter genlocing state.After receiver is to the coded sequence genlocing receiving, just can carry out demodulation to carrier wave by carrier synchronization tracking and data demodulation circuit, and then obtain original information data and carrier information, complete receiving course.
The invention has the beneficial effects as follows:
Alleviate labor strength, increase work efficiency.
Realize the automation of higher degree.
Improve existing zero intermediate frequency band spread receiver level.
Brief description of the drawings
Fig. 1 is that receiver related process module hardware of the present invention is realized theory diagram.
Fig. 2 is directly-enlarging system receiver principle block diagram.
Embodiment
In conjunction with Fig. 1 and Fig. 2, receiver receives after the next spread-spectrum signal of transmitting, gives three circuit: frequency expansion sequence synchronization acquiring circuit, frequency expansion sequence synchronous follow-up circuit and carrier synchronization tracking and data demodulation circuit after premenstrual storing is large.Signal, first by synchronization acquiring circuit, makes the phase place of receiver adjustment and selection local coder sequence, produces the local spreading code consistent with transmitting terminal sequence phase, completes the initial synchronisation of coded sequence.Although now local spreading code is consistent with the coded sequence phase place of reception, but accurate consistent degree is to each other also not high, synchronous follow-up circuit need to be entered so that local pseudo-code is in full accord with the phase place of received code, and establish the tracking of local spreading code to received code sequence phase, enter genlocing state.After receiver is to the coded sequence genlocing receiving, just can carry out demodulation to carrier wave by carrier synchronization tracking and data demodulation circuit, and then obtain original information data and carrier information, complete receiving course.
Claims (2)
1. a zero intermediate frequency band spread receiver design, it mainly comprises frequency mixer (multiplier), pseudo code correlation device, integration washer, digital loop filters, code phase counter, carrier wave complete cycle phase counter, code delay control circuit, code DCO, phase control logic, carrier wave DCO and read-write control logic.
2. the receiver of spread spectrum communication system is just many than conventional communication control processor complexity, after receiver receives spread-spectrum signal, first be to remove coded sequence to sending the spread spectrum (abbreviation despreading) of information data, the carrier signal of acquired information Data Modulation, remake carrier wave demodulation, thereby obtain the information sending, achieve a butt joint collect mail number despreading, the local pseudo-code sequence that just must make receiver produce and the pseudo-code sequence complete matching receiving, therefore the receiver of spread spectrum communication system is mainly made up of three parts: 1. synchronous tracking 3. carrier wave demodulations of catching 2. spreading codes of spreading code, this three part is to be completed by hardware circuit (to the spread-spectrum signal the receiving despread-and-demodulation of being correlated with) and software algorithm (signal is carried out to filtering and controlled quentity controlled variable is resolved) collaborative work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210525354.9A CN103873087A (en) | 2012-12-07 | 2012-12-07 | Zero-intermediate-frequency spread spectrum receiver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210525354.9A CN103873087A (en) | 2012-12-07 | 2012-12-07 | Zero-intermediate-frequency spread spectrum receiver |
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| CN103873087A true CN103873087A (en) | 2014-06-18 |
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| CN201210525354.9A Pending CN103873087A (en) | 2012-12-07 | 2012-12-07 | Zero-intermediate-frequency spread spectrum receiver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114928374A (en) * | 2022-05-09 | 2022-08-19 | 北京全路通信信号研究设计院集团有限公司 | Demodulation method and device for resisting multiple access interference, electronic equipment and storage medium |
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2012
- 2012-12-07 CN CN201210525354.9A patent/CN103873087A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114928374A (en) * | 2022-05-09 | 2022-08-19 | 北京全路通信信号研究设计院集团有限公司 | Demodulation method and device for resisting multiple access interference, electronic equipment and storage medium |
| CN114928374B (en) * | 2022-05-09 | 2023-06-27 | 北京全路通信信号研究设计院集团有限公司 | Multi-access interference resistant demodulation method, device, electronic equipment and storage medium |
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Application publication date: 20140618 |