Lexikon der Mechatronik / Wörterbuch deutsch-englisch
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In addition, another structural safety measure can be provided by the on-board unit is equipped with a housing that is secured by a tamper switch. Unauthorized opening of the on-board unit can be excluded thus, since it is ensured that the housing of the on-board unit can only be opened when the device has been returned. According to the invention, it is possible to reduce the number of data to be transmitted from the on-board unit to the back office by the data is transmitted in compressed form.
In addition, you can set that not all fixes, that is all location measurement of the mobile unit are transferred, but rather a collection of fixes. However, it proves as part of the further processing necessary that more fixes must be available, as has been transmitted from the on-board unit, it is inventively provided that additional fixes are inserted under access to an approximation module.
The approximation module accesses in particular to at least one approximation method, particularly to a spline approximation that relates the data already entered in each case in relation to each other and generates the missing data due to a proximity algorithm, and thus fills the gaps.
In the preferred embodiment of the invention, it can be set, at which times the data from the on-board unit to the back office to be transferred. It is possible to provide configurable time intervals here, resulting in a time-dependent transmission. Cumulatively or alternatively, it is possible to trigger the transfer as soon as a predeterminable threshold is reached.
Is the on-board unit, for example, formed with a buffer memory, it may be set that the data is transmitted when a capacity of the buffer memory is almost reached. It is also possible to make the on-board unit without buffer storage.
In this case, the data can be transmitted upon receipt of a particular data size. Usually, the computed by the back-office normalized position data are provided in a configurable format. The format is usually adapted to the requirements of the service instance for further processing.
In addition to the Cartesian coordinate system with x, y and z axis, the position data can be provided in any other format, such as in the WGS84 format.
Normalization of data is performed in the back office. Objective of normalization is to simply be able to depend on the requirements of the downstream service or by calculations of the stored service instances quickly and provide the necessary position data in the desired format. The service instances can further refine the data thus processed according to specific requirements. The data transmitted from the mobile on-board unit to the back office, are raw satellite data.3 dimensionales Koordinatensystem - Punkte ablesen by einfach mathe!
These are transformed in the back office without loss into a different representation of the data, namely normalized position data. A significant advantage of the invention is to be seen in the modularity of the system.
For the system to be expanded and easily by adding more service instances are added via suitable interfaces. In der Regel handelt es sich bei den Service-Instanzen um solche, die zur Verarbeitung von positions-bezbgenen Daten ausgelegt sind.
Usually it concerns with the service instances are those which are designed for processing position-bezbgenen data. An on-board unit are each equipped with a receiver which is intended for receiving position-related raw satellite data. A DSRC system is disadvantageously only for short distances, especially those of less than 8 meters, designed and includes a DSRC tag, which is arranged on the mobile unit and continues to require structural measures on the road, particularly in the form of beacons, the electronic modules include and are designed to register the "passing" DSRC tags of the respective vehicles.
The data collected at the beacon is then transmitted to the back office. This system is today, for example in Austria application by a toll road section by two limiting beacon is enclosed in each case. Advantageously, the solution according to the invention is designed so that it can interact with such a DSRC system.
Therefore, the on-board unit according to the invention may be formed with at least one corresponding interface. In this case, the on-board unit according to the invention takes over the function of the normal DSRC tags. Thus, once the DSRC communication is activated, the on-board unit according to the invention prepares the corresponding DSRC modem or possibly multiple modems for the upcoming communication, monitoring these.
Moreover, it is inventively possible to operate the on-board unit in a selectable dual-mode. This is particularly useful if an operation performed DSRC survey is not success or failure, and can thus be compensated by the alternative pathway.
With this feature, the application possibilities of the inventive solution can be significantly expanded and integrated into existing applications. In addition, possible errors can be reduced, caused by faulty data collection. The background for this feature is that there are countries that no toll is introduced for still or provide only a toll for certain vehicle types.
With this feature it is possible to prevent communication between on-board unit and the back office so long on or off, to the collection of position-related data makes sense, taken for example into operation by a toll system in this country has been.
This ensures that the cost for establishing the connection between on-board unit and the back office can be reduced, which would otherwise be caused by an unnecessary sending position-related data.
Alternatively, the activation mechanism may also on other criteria are based such as time of day intervals where no toll is charged for a certain distance. Each on-board unit can be clearly identified from the back office. This makes it possible to the back-office position-related data transmitted automatically and unique to an on-board unit. In an alternative embodiment of the invention, several on-board units can be combined into a group of on-board units.
This can be useful for a group of vehicles of a logistics company in fleet management systems in particular. Falls diese eindeutige ldentifizierungsnummer der On-Board-Unit mit den Betreibernummern kollidiert bzw. If this unique identification number of the on-board unit collides with the operator numbers or is incompatible in the number range, an operator can optionally define a unique number, called a virtual ID.
This is associated with the unique number of the on-board unit mapping. The processing with the internal ID is encapsulated for the operator so that it - can use its proprietary ID - as usual. According to the mapping rule is based on a one correspondence relation.
The respective on-board units are controlled by this control unit of the back office. This makes it possible even in time past to supply records for further processing, without these data must be collected. It is possible also to undergo control already collected data error checking and. The satellite operators publish such error messages.
These can be assigned according to the invention the position-related data thus erroneously detected and a total of correct position data can be derived. If pseudo-range data is transmitted to the back office of the on-board unit, these data are subject to errors due to the detection method. The error based on the signal propagation time between the satellite and receiver ie the on-board unit. In a pseudo-range measurement, the signal propagation times are measured in comparison to a receiver clock which is not possible with the transmit clocks the satellite synchronized.
Die "Pseudo-Ranges" sind deshalb nur scheinbare Entfernungen und ergeben sich aus dem Produkt der jeweiligen Zeit und der Ausbreitungsgeschwindigkeit des Signals. The "pseudo-rank" are therefore only apparent distances and result from the product of the respective time and the speed of propagation of the signal.
This error can be eliminated according to the invention or eliminated by the reference position signals are detected by stationary reference stations. For example, four reference stations are used for a territory of the Federal Republic of Germany.
The reference data detected by the stationary reference stations are used in the calculation of the normalized position data within the back-office, in particular the position calculation instance. Moreover, it is possible to connect other known troubleshooting measures to clean up the records corresponding interfaces of the present system in order to increase the quality of the recorded position data.
In an advantageous embodiment of the invention is not pseudo-range data from the on-board unit is transmitted to the back office, but already satellite position information data.
In this embodiment, the position calculation instance can be made much thinner and is preferably determined only for reading the relevant data. Where appropriate, this data can be transformed into another format, depending on the requirements of the service instances for further processing of the data. In the preferred embodiment of the invention, at least one of the method steps and preferably all process steps is carried out automatically. Accordingly, it is possible to perform the toll fully automated without the need of having to initiate certain calculations "by hand".
In operation, the inventive system is designed so that the respective on-board unit will automatically detect your current position after switching on. Depending activated from the current position and configuration, the on-board unit: Based on the detected current position, it is possible that the on-board unit decides automatically and autonomously which operating mode has to be activated, and that any time a change can be made.
Normally, the operation mode based on the detected locale. To increase the security of the system, it is intended that any communication between the on-board unit and the back office is checked for successful authorization. Preferably a Connection service is intended as a link between the back office and the respective on-board units that routes frames or packets between the on-board units and the back office and encrypts and decrypts, signatures telegrams generated and checked and checked the on-board unit to a successful authentication back.
A communication service is usually provided by one or more mobile operators in different countries.
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This component will be collected position-related data transferred any status messages or updates to the back office. It is also possible to deal with the control of the on-board units starting from the back office via this communication channel.
Moreover, the object is achieved by a system for processing position-related data, comprising: The respective mobile on-board units are according to the invention as thin clients formed and all possible processing and computation instances are arranged or in the back office associated therewith.
It is possible to integrate the respective calculation instances in the back office. Alternatively, it is possible to provide the instances mentioned above as separate modular components and to connect via respective interfaces to the back-office. In addition, the object of the invention is achieved by a device for processing position-related data, having means which are adapted for performing at least one of the above-mentioned method. Some studies have suggested that nominal wages do not easily adjust downward.
If lower price inflation is accompanied by lower average wage inflation, then the prevalence of nominal wages being constrained from falling could increase as price inflation moves toward or below zero.
In these circumstances, the effective clearing of labor markets would be inhibited, with the consequence being higher rates of unemployment. Taken together, these considerations suggest that deflation could well be more damaging than inflation to economic growth. While this asymmetry should not be overlooked, several factors limit its significance. In particular, more rapid advances in productivity can make this asymmetry less severe.
Fast growth of productivity, by buoying expectations of future advances of wages and earnings and thus aggregate demand, enables real interest rates to be higher than would otherwise be the case without restricting economic growth.
Moreover, to the extent that more-rapid growth of productivity shows through to faster gains in nominal wages, there will be fewer instances in which nominal wages will be pressured to fall.
One also should not overstate the difficulties posed for monetary policy by the zero bound on interest rates and nominal wage inflexibility even in the absence of faster productivity growth. The expansion of the monetary base can proceed even if overnight rates are driven to their zero lower bound. The Federal Reserve has authority to purchase Treasury securities of any maturity and indeed already purchases such securities as part of its procedures to keep the overnight rate at its desired level.
This authority could be used to lower interest rates at longer maturities. Such actions have precedent: With respect to potential difficulties in labor markets, results from research remain ambiguous on the extent and persistence of downward rigidity in nominal compensation. Clearly, it would be desirable to avoid deflation. But if deflation were to develop, options for an aggressive monetary policy response are available.
That characteristic is far more evident today than two or three decades ago.
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There may be numerous causes of this increased resilience. Furthermore, a quarter-century of bipartisan deregulation has significantly reduced inflexibilities in our markets for energy, transportation, communication, and financial services. And, of course, the dramatic gains in information technology have markedly improved the ability of businesses to address festering economic imbalances before they inflict significant damage. This improved ability has been further facilitated by the increasing willingness of our workers to embrace innovation more generally.
Irrespective of how deflationary forces might influence it, our economy has the benefit of enhanced flexibility, which has, at least to date, allowed us to withstand the potentially destabilizing effects of some substantial negative shocks. This connection, real or speculative, raises some interesting questions about the most effective approach to the conduct of monetary policy.
If the bursting of an asset bubble creates economic dislocation, then preventing bubbles might seem an attractive goal.
But whether incipient bubbles can be detected in real time and whether, once detected, they can be defused without inadvertently precipitating still greater adverse consequences for the economy remain in doubt. It may be useful, as a first step, to consider both the economic circumstances most likely to impede the development of bubbles and the circumstances most conducive to their formation. Destabilizing macroeconomic policies and poor economic performance are not likely to provide fertile ground for the optimism that usually accompanies surging asset prices.
Ironically, low inflation, economic stability, and low risk premiums may provide tinder for asset price speculation that could be sparked should technological innovations open up new opportunities for profitable investment. Even in such circumstances, bubble pricing is likely to be inhibited for a company with a history. To be sure, the stock prices of old-line companies do rise somewhat through arbitrage when the market as a whole is propelled higher by stock prices of cutting-edge technologies.
But it is difficult to imagine stock prices of most well-established and seasoned old-line companies surging to wholly unsustainable heights. With some prominent exceptions, their capabilities for future profits have been largely tested and delimited.
The situation is likely different in the case of a new company that employs an innovative technology. Under these circumstances, the dispersion of rationally imagined possible future outcomes could be wide. If forecasts are unfettered by a need for consistency with the past, investors might take off on unwarranted flights of optimism. Moreover, skeptics find it too expensive or too risky to short sell the shares of such a company, especially when its stock price is rising rapidly.
The conditions of extended low inflation and low risk were combined with breakthrough technologies to produce the bubble of recent years. But do such conditions always produce a bubble? It seems improbable that a surge in innovation in the near future would generate a new bubble of substantial proportions.
Investors are likely to be sensitive to the need for asset prices to be backed ultimately by an ongoing stream of earnings. Hence, a further necessary condition for the emergence of a bubble is the passage of sufficient time to erode the traumatic memories of earlier post-bubble experiences. According to such models, a tighter monetary policy, on average, credibly constrains demand and lowers asset prices, all else being equal.
These models can also be interpreted to suggest that incremental monetary tightening can gradually deflate stock prices. It is not based on evidence drawn from history. In fact, history indicates that bubbles tend to deflate not gradually and linearly but suddenly, unpredictably, and often violently. In addition, the degree of monetary tightening that would be required to contain or offset a bubble of any substantial dimension appears to be so great as to risk an unacceptable amount of collateral damage to the wider economy.
The evidence of recent years, as well as the events of the late s, casts doubt on the proposition that bubbles can be defused gradually. Such data suggest that nothing short of a sharp increase in short-term rates that engenders a significant economic retrenchment is sufficient to check a nascent bubble.
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The notion that a well-timed incremental tightening could have been calibrated to prevent the late s bubble is almost surely illusion. Faced with this uncertainty, the Federal Reserve has focused on policies that would, as I testified before the Congress in" It is too soon to judge the final outcome of the strategy that we adopted. The contractionary impulse from the decline in equity prices appeared to be diminishing around the middle of this year.
But then the fallout for stock prices from corporate governance malfeasance, argued by some as having been spawned by the bubble, became more intense. This, in turn, damped capital investment and trimmed inventory plans. More recently, of course, geopolitical risk has risen markedly, further weighing on demand.
Though unrelated to the bubble burst ofit has muddied the evaluation of the post-bubble economy. If the postmortem of recent monetary policy shows that the results of addressing the bubble only after it bursts are unsatisfactory, we would be left with less-appealing choices for the future. In that case, finding ways to identify bubbles and to contain their progress would be desirable, though history cautions that prospects for success appear slim.
The difficulties that policymakers and private agents face become especially acute as an economic expansion lengthens. The decline in risk premiums under these circumstances presumably results, in part, from rational appraisals.
In an economy in which the business cycle has averaged four years in length over a protracted period, households and businesses would doubtless become more cautious in the fourth year of a new cycle. But how do they behave when, as for the past two decades, expansions have been long and cyclical downturns have been exceptionally rare? After five or six years of uninterrupted expansion, is it irrational or even unreasonable to assume that expansion would continue for the subsequent six months?
Thus, it was disturbing to observe risk seemingly being priced so cheaply in late when BBB corporate spreads over ten-year Treasuries sunk to only 70 basis points.
That spread is now about basis points, although it has narrowed significantly in recent weeks. As I noted earlier, it seems ironic that a monetary policy that is successful in inducing stability may inadvertently be sowing the seeds of instability associated with asset bubbles. I trust that the use by the central bank of deliberately inflationary policy as protection against bubbles can be readily dismissed.
While the current episode has not yet concluded, it appears that, responding vigorously in a relatively flexible economy to the aftermath of bubbles, as traumatic as that may be, is less inhibiting to long-term growth than chronic high-inflation monetary policy.
Moderate inflation might possibly inhibit bubbles, though at some cost of reduced economic efficiency.
However, I doubt that such policies could be sustained or well-controlled by central banks. Among our realistically limited alternatives, dealing aggressively with the aftermath of a bubble appears the most likely to avert long-term damage to the economy. As I pointed out earlier, the U.