CN108761434B - Pseudo-range measurement method and system based on CDMA downlink signals - Google Patents
Pseudo-range measurement method and system based on CDMA downlink signals Download PDFInfo
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- CN108761434B CN108761434B CN201810258754.5A CN201810258754A CN108761434B CN 108761434 B CN108761434 B CN 108761434B CN 201810258754 A CN201810258754 A CN 201810258754A CN 108761434 B CN108761434 B CN 108761434B
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- downlink signal
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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
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
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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
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/0009—Transmission of position information to remote stations
- G01S5/0045—Transmission from base station to mobile station
Abstract
The invention discloses a pseudo-range measurement method and a system based on CDMA downlink signals, wherein the pseudo-range is the distance from a CDMA base station to a user, and the method comprises the following steps: receiving a CDMA downlink signal; carrying out pilot frequency sequence correlation peak search on a received CDMA downlink signal to obtain a local time t of the position where the maximum correlation peak of a pilot frequency sequence occurs; removing the whole surplus of the pilot frequency period at the local time t to obtain the transmission time of the CDMA downlink signal from a base station to a user; the pseudoranges are computed from the time of transmission. The invention breaks through the limitation of bidirectional information interaction of the existing CDMA base station ranging technology, simultaneously bypasses the complex process of demodulating CDMA synchronous signals, and can conveniently and quickly realize the measurement of the pseudo range of the base station by the user.
Description
Technical Field
The invention relates to the field of passive ranging, in particular to a pseudo-range measurement method and a pseudo-range measurement system based on CDMA downlink signals.
Background
The current principle of using CDMA signals for ranging is based on the user mobile phone transmitting a ranging request signal to a CDMA base station, and after receiving the request signal, the base station performs calculation processing to send the range information to the user mobile phone through a response signal. The existing ranging technology can realize ranging only by depending on information interaction between a user mobile phone and a CDMA signal base station.
In the existing distance measurement mode, in the distance measurement process based on CDMA signals, the CDMA signal distance measurement must complete the two-way interaction between a user mobile phone and a CDMA base station, and the user mobile phone needs to initiate the information of a distance measurement request, so that the distance measurement process is complicated and is easy to be interfered; the time consumption of the ranging process is long, the position of the user mobile phone cannot be moved in the ranging process, and otherwise, the ranging is inaccurate.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the problems in the prior art, the pseudo-range measurement method and the pseudo-range measurement system based on the CDMA downlink signal are provided, the pseudo-range from the CDMA base station to the user receiver can be quickly and accurately measured, better real-time performance is obtained, the method and the system are convenient and quick to apply, and the method and the system can be applied to digital television signal navigation positioning.
The invention provides a pseudo-range measurement method based on CDMA downlink signals, wherein the pseudo-range is the distance from a CDMA base station to a user, and the method is characterized by comprising the following steps:
receiving a CDMA downlink signal;
carrying out pilot frequency sequence correlation peak search on a received CDMA downlink signal to obtain a local time t of the position where the maximum correlation peak of a pilot frequency sequence occurs;
removing the whole surplus of the pilot frequency period at the local time t to obtain the transmission time of the CDMA downlink signal from a base station to a user;
The pseudorange is computed from the time of transmission.
Another aspect of the present invention provides a pseudorange measurement system based on a CDMA downlink signal, where the pseudorange is a distance from a CDMA base station to a user, including:
a receiving unit, configured to receive a CDMA downlink signal;
a searching unit, which is used for searching the pilot frequency sequence correlation peak of the received CDMA downlink signal and obtaining the local time t of the occurrence position of the maximum correlation peak of the pilot frequency sequence;
and the calculating unit is used for removing the whole surplus of the local time t to the pilot frequency period to obtain the transmission time of the CDMA downlink signal from the base station to the user and calculating the pseudo range according to the transmission time.
Another aspect of the present invention provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of:
carrying out pilot frequency sequence correlation peak search on a received CDMA downlink signal to obtain a local time t of the position where the maximum correlation peak of a pilot frequency sequence occurs;
removing the whole surplus of the pilot frequency period at the local time t to obtain the transmission time of the CDMA downlink signal from a base station to a user;
the pseudoranges are computed from the time of transmission.
Compared with the prior art, the invention breaks through the limitation of bidirectional information interaction of the existing CDMA base station ranging technology, simultaneously bypasses the complex process of demodulating CDMA synchronous signals, and can conveniently and quickly realize the measurement of the pseudo range of the base station by the user.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic diagram of a signal transmission model when pseudo-range measurement is performed based on a CDMA downlink signal;
FIG. 2 is a diagram of pilot sequence correlation peak time intervals;
fig. 3 is a diagram illustrating pseudorange measurement based on a CDMA downlink signal.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
As shown in fig. 1, fig. 1 shows a signal transmission model when pseudo-range measurement is performed based on a CDMA downlink signal. The user receiver receives the downlink signal sent by the CDMA base station, and the pseudo-range measurement from the base station to the user is completed by the pseudo-range measurement method provided by the invention.
The CDMA signal downlink transmit power was found by analysis to be 43dBm, with 15% being used for the pilot channel. The transmission loss of the cellular system at 15% building density in CCIR City mode is (d) kmDistance from base station to user, in km):
L(dB)＝126.93+36.4log10dkm
the propagation loss of the cellular system in the absence of urban building occlusion in mountainous areas is (d)mDistance from base station to user, in m):
L(dB)＝20log10(4·π·f·dm/c)
the transmission frequency band of the downlink signal of the CDMA (IS-95 standard) in China IS between 867MHz and 880MHz, and a mobile phone user can receive a unique strong base station signal according to the coverage characteristics of cellular signals. Depending on the characteristics of the cellular network, it may be determined that the maximum coverage distance of each cell does not exceed the distance traveled by a CDMA signal within one pilot sequence period (a CDMA downlink signal has a pilot period time of 80/3(ms), and a radio signal may travel about 8000km during this time interval).
Fig. 2 shows pilot sequence correlation peak time intervals. According to the characteristics of the CDMA downlink signal, the invention provides a quick and convenient ranging method.
As shown in fig. 3, the user receiver receives the CDMA downlink signal, performs pilot sequence correlation peak search and accurate acquisition of the occurrence time of the correlation peak on the received CDMA downlink signal, and records the local time t of the occurrence position of the maximum correlation peak of the searched pilot sequence.
Since the starting time of the pilot sequence is an integral multiple of the pilot period, the position where the maximum correlation peak of the pilot sequence searched by the user receiver appears represents the transmission time t 0Is n times 80/3(ms), where n is an integer, and from the analysis, the transmission time t can be derived0N 80/3 (ms).
Through the analysis of the transmission characteristics of the CDMA downlink signal, since the transmission distance does not exceed the distance of the signal in one pilot frequency period, the following conclusion can be drawn: t is t0T ≦ 80/3 (ms). The analysis finds that only the integer remainder of the pilot frequency period needs to be removed at the local time t, and the obtained remainder is the transmission time of the CDMA downlink signal from the base station to the user: dt isTransmission ofMod (t,80/3), with t in ms, mod (a, B) indicates that a takes the remainder of B. The distance from the base station to the user receiver can be obtained by multiplying the obtained transmission time by the transmission speed of the radio signal in the air: l ═ c · mod (t,80/3)/1000, where c represents the propagation velocity of a radio signal in air, which is approximately 3 × 108m/s, and the unit of L is m.
The receiving sampling rate of the user receiver to the CDMA downlink signal determines the accuracy of searching and extracting the pilot frequency sequence correlation peak, and finally influences the transmission time measurement and the distance measurement accuracy. Through multiple simulation comparisons, the higher the sampling rate of the received signal is, the higher the ranging accuracy is, but in practical application, the requirement on hardware performance is high due to the improvement of the sampling rate, so that in practical application, a proper sampling rate should be selected. In some embodiments, the sampling rate must satisfy the bandpass sampling theorem.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of steps disclosed.
Claims (3)
1. A pseudo-range measurement method based on CDMA downlink signals, wherein the pseudo-range is the distance from a CDMA base station to a user, and the method is characterized by comprising the following steps:
receiving a CDMA downlink signal;
carrying out pilot frequency sequence correlation peak search on a received CDMA downlink signal to obtain a local time t of the position where the maximum correlation peak of a pilot frequency sequence occurs;
removing the whole surplus of the pilot frequency period at the local time t to obtain the transmission time of the CDMA downlink signal from a base station to a user;
calculating a pseudo range according to the transmission time;
the distance from the base station to the user receiver can be obtained by multiplying the obtained transmission time by the transmission speed of the radio signal in the air: l ═ c · mod (t, 80/3)/1000, where c represents the propagation velocity of a radio signal in air, which is approximately 3 × 108m/s, mod (A, B) denotes A rounding off B, t is the local time, and L is in m.
2. The system according to claim 1, wherein the pseudorange is a distance from a CDMA base station to a user, comprising:
A receiving unit, configured to receive a CDMA downlink signal;
a searching unit, configured to perform pilot sequence correlation peak search on a received CDMA downlink signal, and obtain a local time t of an occurrence position of a maximum correlation peak of a pilot sequence;
and the calculating unit is used for removing the whole surplus of the local time t to the pilot frequency period to obtain the transmission time of the CDMA downlink signal from the base station to the user and calculating the pseudo range according to the transmission time.
3. The computer-readable storage medium of a CDMA downlink signal based pseudorange measurement method according to claim 1, wherein said computer program is stored thereon, and when executed by a processor, implements the steps of:
carrying out pilot frequency sequence correlation peak search on a received CDMA downlink signal to obtain a local time t of the position where the maximum correlation peak of a pilot frequency sequence occurs;
removing the whole surplus of the pilot frequency period at the local time t to obtain the transmission time of the CDMA downlink signal from a base station to a user;
the pseudoranges are computed from the time of transmission.
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| CN114513745A (en) * | 2021-12-16 | 2022-05-17 | 中国电子科技集团公司第二十九研究所 | Positioning method and system based on CDMA downlink signal and digital television signal |
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